X-Git-Url: http://pere.pagekite.me/gitweb/homepage.git/blobdiff_plain/89d80f8cd9bb1d6f9ec4b2923e4fe25948ce3d9f..7bcee7b394f4e64700ed499f6c65e02fcc053e6e:/blog/index.rss diff --git a/blog/index.rss b/blog/index.rss index c917b0e617..7741e00372 100644 --- a/blog/index.rss +++ b/blog/index.rss @@ -7,668 +7,894 @@ - Teaching vmdebootstrap to create Raspberry Pi SD card images - http://people.skolelinux.org/pere/blog/Teaching_vmdebootstrap_to_create_Raspberry_Pi_SD_card_images.html - http://people.skolelinux.org/pere/blog/Teaching_vmdebootstrap_to_create_Raspberry_Pi_SD_card_images.html - Sun, 27 Oct 2013 17:00:00 +0100 - <p>The -<a href="http://packages.qa.debian.org/v/vmdebootstrap.html">vmdebootstrap</a> -program is a a very nice system to create virtual machine images. It -create a image file, add a partition table, mount it and run -debootstrap in the mounted directory to create a Debian system on a -stick. Yesterday, I decided to try to teach it how to make images for -<a href="https://wiki.debian.org/RaspberryPi">Raspberry Pi</a>, as part -of a plan to simplify the build system for -<a href="https://wiki.debian.org/FreedomBox">the FreedomBox -project</a>. The FreedomBox project already uses vmdebootstrap for -the virtualbox images, but its current build system made multistrap -based system for Dreamplug images, and it is lacking support for -Raspberry Pi.</p> - -<p>Armed with the knowledge on how to build "foreign" (aka non-native -architecture) chroots for Raspberry Pi, I dived into the vmdebootstrap -code and adjusted it to be able to build armel images on my amd64 -Debian laptop. I ended up giving vmdebootstrap five new options, -allowing me to replicate the image creation process I use to make -<a href=http://people.skolelinux.org/pere/blog/A_Raspberry_Pi_based_batman_adv_Mesh_network_node.html"">Debian -Jessie based mesh node images for the Raspberry Pi</a>. First, the -<tt>--foreign /path/to/binfm_handler</tt> option tell vmdebootstrap to -call debootstrap with --foreign and to copy the handler into the -generated chroot before running the second stage. This allow -vmdebootstrap to create armel images on an amd64 host. Next I added -two new options <tt>--bootsize size</tt> and <tt>--boottype -fstype</tt> to teach it to create a separate /boot/ partition with the -given file system type, allowing me to create an image with a vfat -partition for the /boot/ stuff. I also added a <tt>--variant -variant</tt> option to allow me to create smaller images without the -Debian base system packages installed. Finally, I added an option -<tt>--no-extlinux</tt> to tell vmdebootstrap to not install extlinux -as a boot loader. It is not needed on the Raspberry Pi and probably -most other non-x86 architectures. The changes were accepted by the -upstream author of vmdebootstrap yesterday and today, and is now -available from -<a href="http://git.liw.fi/cgi-bin/cgit/cgit.cgi/vmdebootstrap/">the -upstream project page</a>.</p> - -<p>To use it to build a Raspberry Pi image using Debian Jessie, first -create a small script (the customize script) to add the non-free -binary blob needed to boot the Raspberry Pi and the APT source -list:</p> - -<p><pre> -#!/bin/sh -set -e # Exit on first error -rootdir="$1" -cd "$rootdir" -cat &lt;&lt;EOF > etc/apt/sources.list -deb http://http.debian.net/debian/ jessie main contrib non-free -EOF -# Install non-free binary blob needed to boot Raspberry Pi. This -# install a kernel somewhere too. -wget https://raw.github.com/Hexxeh/rpi-update/master/rpi-update \ - -O $rootdir/usr/bin/rpi-update -chmod a+x $rootdir/usr/bin/rpi-update -mkdir -p $rootdir/lib/modules -touch $rootdir/boot/start.elf -chroot $rootdir rpi-update -</pre></p> - -<p>Next, fetch the latest vmdebootstrap script and call it like this -to build the image:</p> - -<pre> -sudo ./vmdebootstrap \ - --variant minbase \ - --arch armel \ - --distribution jessie \ - --mirror http://http.debian.net/debian \ - --image test.img \ - --size 600M \ - --bootsize 64M \ - --boottype vfat \ - --log-level debug \ - --verbose \ - --no-kernel \ - --no-extlinux \ - --root-password raspberry \ - --hostname raspberrypi \ - --foreign /usr/bin/qemu-arm-static \ - --customize `pwd`/customize \ - --package netbase \ - --package git-core \ - --package binutils \ - --package ca-certificates \ - --package wget \ - --package kmod -</pre></p> - -<p>The list of packages being installed are the ones needed by -rpi-update to make the image bootable on the Raspberry Pi, with the -exception of netbase, which is needed by debootstrap to find -/etc/hosts with the minbase variant. I really wish there was a way to -set up an Raspberry Pi using only packages in the Debian archive, but -that is not possible as far as I know, because it boots from the GPU -using a non-free binary blob.</p> - -<p>The build host need debootstrap, kpartx and qemu-user-static and -probably a few others installed. I have not checked the complete -build dependency list.</p> - -<p>The resulting image will not use the hardware floating point unit -on the Raspberry PI, because the armel architecture in Debian is not -optimized for that use. So the images created will be a bit slower -than <a href="http://www.raspbian.org/">Raspbian</a> based images.</p> + S3QL, a locally mounted cloud file system - nice free software + http://people.skolelinux.org/pere/blog/S3QL__a_locally_mounted_cloud_file_system___nice_free_software.html + http://people.skolelinux.org/pere/blog/S3QL__a_locally_mounted_cloud_file_system___nice_free_software.html + Wed, 9 Apr 2014 11:30:00 +0200 + <p>For a while now, I have been looking for a sensible offsite backup +solution for use at home. My requirements are simple, it must be +cheap and locally encrypted (in other words, I keep the encryption +keys, the storage provider do not have access to my private files). +One idea me and my friends had many years ago, before the cloud +storage providers showed up, was to use Google mail as storage, +writing a Linux block device storing blocks as emails in the mail +service provided by Google, and thus get heaps of free space. On top +of this one can add encryption, RAID and volume management to have +lots of (fairly slow, I admit that) cheap and encrypted storage. But +I never found time to implement such system. But the last few weeks I +have looked at a system called +<a href="https://bitbucket.org/nikratio/s3ql/">S3QL</a>, a locally +mounted network backed file system with the features I need.</p> + +<p>S3QL is a fuse file system with a local cache and cloud storage, +handling several different storage providers, any with Amazon S3, +Google Drive or OpenStack API. There are heaps of such storage +providers. S3QL can also use a local directory as storage, which +combined with sshfs allow for file storage on any ssh server. S3QL +include support for encryption, compression, de-duplication, snapshots +and immutable file systems, allowing me to mount the remote storage as +a local mount point, look at and use the files as if they were local, +while the content is stored in the cloud as well. This allow me to +have a backup that should survive fire. The file system can not be +shared between several machines at the same time, as only one can +mount it at the time, but any machine with the encryption key and +access to the storage service can mount it if it is unmounted.</p> + +<p>It is simple to use. I'm using it on Debian Wheezy, where the +package is included already. So to get started, run <tt>apt-get +install s3ql</tt>. Next, pick a storage provider. I ended up picking +Greenqloud, after reading their nice recipe on +<a href="https://greenqloud.zendesk.com/entries/44611757-How-To-Use-S3QL-to-mount-a-StorageQloud-bucket-on-Debian-Wheezy">how +to use S3QL with their Amazon S3 service</a>, because I trust the laws +in Iceland more than those in USA when it come to keeping my personal +data safe and private, and thus would rather spend money on a company +in Iceland. Another nice recipe is available from the article +<a href="http://www.admin-magazine.com/HPC/Articles/HPC-Cloud-Storage">S3QL +Filesystem for HPC Storage</a> by Jeff Layton in the HPC section of +Admin magazine. When the provider is picked, figure out how to get +the API key needed to connect to the storage API. With Greencloud, +the key did not show up until I had added payment details to my +account.</p> + +<p>Armed with the API access details, it is time to create the file +system. First, create a new bucket in the cloud. This bucket is the +file system storage area. I picked a bucket name reflecting the +machine that was going to store data there, but any name will do. +I'll refer to it as <tt>bucket-name</tt> below. In addition, one need +the API login and password, and a locally created password. Store it +all in ~root/.s3ql/authinfo2 like this: + +<p><blockquote><pre> +[s3c] +storage-url: s3c://s.greenqloud.com:443/bucket-name +backend-login: API-login +backend-password: API-password +fs-passphrase: local-password +</pre></blockquote></p> + +<p>I create my local passphrase using <tt>pwget 50</tt> or similar, +but any sensible way to create a fairly random password should do it. +Armed with these details, it is now time to run mkfs, entering the API +details and password to create it:</p> + +<p><blockquote><pre> +# mkdir -m 700 /var/lib/s3ql-cache +# mkfs.s3ql --cachedir /var/lib/s3ql-cache --authfile /root/.s3ql/authinfo2 \ + --ssl s3c://s.greenqloud.com:443/bucket-name +Enter backend login: +Enter backend password: +Before using S3QL, make sure to read the user's guide, especially +the 'Important Rules to Avoid Loosing Data' section. +Enter encryption password: +Confirm encryption password: +Generating random encryption key... +Creating metadata tables... +Dumping metadata... +..objects.. +..blocks.. +..inodes.. +..inode_blocks.. +..symlink_targets.. +..names.. +..contents.. +..ext_attributes.. +Compressing and uploading metadata... +Wrote 0.00 MB of compressed metadata. +# </pre></blockquote></p> + +<p>The next step is mounting the file system to make the storage available. + +<p><blockquote><pre> +# mount.s3ql --cachedir /var/lib/s3ql-cache --authfile /root/.s3ql/authinfo2 \ + --ssl --allow-root s3c://s.greenqloud.com:443/bucket-name /s3ql +Using 4 upload threads. +Downloading and decompressing metadata... +Reading metadata... +..objects.. +..blocks.. +..inodes.. +..inode_blocks.. +..symlink_targets.. +..names.. +..contents.. +..ext_attributes.. +Mounting filesystem... +# df -h /s3ql +Filesystem Size Used Avail Use% Mounted on +s3c://s.greenqloud.com:443/bucket-name 1.0T 0 1.0T 0% /s3ql +# +</pre></blockquote></p> + +<p>The file system is now ready for use. I use rsync to store my +backups in it, and as the metadata used by rsync is downloaded at +mount time, no network traffic (and storage cost) is triggered by +running rsync. To unmount, one should not use the normal umount +command, as this will not flush the cache to the cloud storage, but +instead running the umount.s3ql command like this: + +<p><blockquote><pre> +# umount.s3ql /s3ql +# +</pre></blockquote></p> + +<p>There is a fsck command available to check the file system and +correct any problems detected. This can be used if the local server +crashes while the file system is mounted, to reset the "already +mounted" flag. This is what it look like when processing a working +file system:</p> + +<p><blockquote><pre> +# fsck.s3ql --force --ssl s3c://s.greenqloud.com:443/bucket-name +Using cached metadata. +File system seems clean, checking anyway. +Checking DB integrity... +Creating temporary extra indices... +Checking lost+found... +Checking cached objects... +Checking names (refcounts)... +Checking contents (names)... +Checking contents (inodes)... +Checking contents (parent inodes)... +Checking objects (reference counts)... +Checking objects (backend)... +..processed 5000 objects so far.. +..processed 10000 objects so far.. +..processed 15000 objects so far.. +Checking objects (sizes)... +Checking blocks (referenced objects)... +Checking blocks (refcounts)... +Checking inode-block mapping (blocks)... +Checking inode-block mapping (inodes)... +Checking inodes (refcounts)... +Checking inodes (sizes)... +Checking extended attributes (names)... +Checking extended attributes (inodes)... +Checking symlinks (inodes)... +Checking directory reachability... +Checking unix conventions... +Checking referential integrity... +Dropping temporary indices... +Backing up old metadata... +Dumping metadata... +..objects.. +..blocks.. +..inodes.. +..inode_blocks.. +..symlink_targets.. +..names.. +..contents.. +..ext_attributes.. +Compressing and uploading metadata... +Wrote 0.89 MB of compressed metadata. +# +</pre></blockquote></p> + +<p>Thanks to the cache, working on files that fit in the cache is very +quick, about the same speed as local file access. Uploading large +amount of data is to me limited by the bandwidth out of and into my +house. Uploading 685 MiB with a 100 MiB cache gave me 305 kiB/s, +which is very close to my upload speed, and downloading the same +Debian installation ISO gave me 610 kiB/s, close to my download speed. +Both were measured using <tt>dd</tt>. So for me, the bottleneck is my +network, not the file system code. I do not know what a good cache +size would be, but suspect that the cache should e larger than your +working set.</p> + +<p>I mentioned that only one machine can mount the file system at the +time. If another machine try, it is told that the file system is +busy:</p> + +<p><blockquote><pre> +# mount.s3ql --cachedir /var/lib/s3ql-cache --authfile /root/.s3ql/authinfo2 \ + --ssl --allow-root s3c://s.greenqloud.com:443/bucket-name /s3ql +Using 8 upload threads. +Backend reports that fs is still mounted elsewhere, aborting. +# +</pre></blockquote></p> + +<p>The file content is uploaded when the cache is full, while the +metadata is uploaded once every 24 hour by default. To ensure the +file system content is flushed to the cloud, one can either umount the +file system, or ask S3QL to flush the cache and metadata using +s3qlctrl: + +<p><blockquote><pre> +# s3qlctrl upload-meta /s3ql +# s3qlctrl flushcache /s3ql +# +</pre></blockquote></p> + +<p>If you are curious about how much space your data uses in the +cloud, and how much compression and deduplication cut down on the +storage usage, you can use s3qlstat on the mounted file system to get +a report:</p> + +<p><blockquote><pre> +# s3qlstat /s3ql +Directory entries: 9141 +Inodes: 9143 +Data blocks: 8851 +Total data size: 22049.38 MB +After de-duplication: 21955.46 MB (99.57% of total) +After compression: 21877.28 MB (99.22% of total, 99.64% of de-duplicated) +Database size: 2.39 MB (uncompressed) +(some values do not take into account not-yet-uploaded dirty blocks in cache) +# +</pre></blockquote></p> + +<p>I mentioned earlier that there are several possible suppliers of +storage. I did not try to locate them all, but am aware of at least +<a href="https://www.greenqloud.com/">Greenqloud</a>, +<a href="http://drive.google.com/">Google Drive</a>, +<a href="http://aws.amazon.com/s3/">Amazon S3 web serivces</a>, +<a href="http://www.rackspace.com/">Rackspace</a> and +<a href="http://crowncloud.net/">Crowncloud</A>. The latter even +accept payment in Bitcoin. Pick one that suit your need. Some of +them provide several GiB of free storage, but the prize models are +quite different and you will have to figure out what suits you +best.</p> + +<p>While researching this blog post, I had a look at research papers +and posters discussing the S3QL file system. There are several, which +told me that the file system is getting a critical check by the +science community and increased my confidence in using it. One nice +poster is titled +"<a href="http://www.lanl.gov/orgs/adtsc/publications/science_highlights_2013/docs/pg68_69.pdf">An +Innovative Parallel Cloud Storage System using OpenStack’s SwiftObject +Store and Transformative Parallel I/O Approach</a>" by Hsing-Bung +Chen, Benjamin McClelland, David Sherrill, Alfred Torrez, Parks Fields +and Pamela Smith. Please have a look.</p> + +<p>Given my problems with different file systems earlier, I decided to +check out the mounted S3QL file system to see if it would be usable as +a home directory (in other word, that it provided POSIX semantics when +it come to locking and umask handling etc). Running +<a href="http://people.skolelinux.org/pere/blog/Testing_if_a_file_system_can_be_used_for_home_directories___.html">my +test code to check file system semantics</a>, I was happy to discover that +no error was found. So the file system can be used for home +directories, if one chooses to do so.</p> + +<p>If you do not want a locally file system, and want something that +work without the Linux fuse file system, I would like to mention the +<a href="http://www.tarsnap.com/">Tarsnap service</a>, which also +provide locally encrypted backup using a command line client. It have +a nicer access control system, where one can split out read and write +access, allowing some systems to write to the backup and others to +only read from it.</p> + +<p>As usual, if you use Bitcoin and want to show your support of my +activities, please send Bitcoin donations to my address +<b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b&label=PetterReinholdtsenBlog">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p> - Det er jo makta som er mest sårbar ved massiv overvåkning av Internett - http://people.skolelinux.org/pere/blog/Det_er_jo_makta_som_er_mest_s_rbar_ved_massiv_overv_kning_av_Internett.html - http://people.skolelinux.org/pere/blog/Det_er_jo_makta_som_er_mest_s_rbar_ved_massiv_overv_kning_av_Internett.html - Sat, 26 Oct 2013 20:30:00 +0200 - <p>De siste måneders eksponering av -<a href="http://www.aftenposten.no/nyheter/uriks/Her-er-Edvard-Snowdens-mest-omtalte-avsloringer-7351734.html">den -totale overvåkningen som foregår i den vestlige verden dokumenterer -hvor sårbare vi er</a>. Men det slår meg at de som er mest sårbare -for dette, myndighetspersoner på alle nivåer, neppe har innsett at de -selv er de mest interessante personene å lage profiler på, for å kunne -påvirke dem.</p> - -<p>For å ta et lite eksempel: Stortingets nettsted, -<a href="http://www.stortinget.no/">www.stortinget.no</a> (og -forsåvidt også -<a href="http://data.stortinget.no/">data.stortinget.no</a>), -inneholder informasjon om det som foregår på Stortinget, og jeg antar -de største brukerne av informasjonen der er representanter og -rådgivere på Stortinget. Intet overraskende med det. Det som derimot -er mer skjult er at Stortingets nettsted bruker -<a href="http://en.wikipedia.org/wiki/Google_Analytics">Google -Analytics</a>, hvilket gjør at enhver som besøker nettsidene der også -rapporterer om besøket via Internett-linjer som passerer Sverige, -England og videre til USA. Det betyr at informasjon om ethvert besøk -på stortingets nettsider kan snappes opp av svensk, britisk og USAs -etterretningsvesen. De kan dermed holde et øye med hvilke -Stortingssaker stortingsrepresentantene synes er interessante å sjekke -ut, og hvilke sider rådgivere og andre på stortinget synes er -interessant å besøke, når de gjør det og hvilke andre representanter -som sjekker de samme sidene omtrent samtidig. Stortingets bruk av -Google Analytics gjør det dermed enkelt for utenlands etteretning å -spore representantenes aktivitet og interesse. Hvis noen av -representantene bruker Google Mail eller noen andre tjenestene som -krever innlogging, så vil det være enda enklere å finne ut nøyaktig -hvilke personer som bruker hvilke nettlesere og dermed knytte -informasjonen opp til enkeltpersoner på Stortinget.</p> - -<p>Og jo flere nettsteder som bruker Google Analytics, jo bedre -oversikt over stortingsrepresentantenes lesevaner og interesse blir -tilgjengelig for svensk, britisk og USAs etterretning. Hva de kan -bruke den informasjonen til overlater jeg til leseren å undres -over.</p> + EU-domstolen bekreftet i dag at datalagringsdirektivet er ulovlig + http://people.skolelinux.org/pere/blog/EU_domstolen_bekreftet_i_dag_at_datalagringsdirektivet_er_ulovlig.html + http://people.skolelinux.org/pere/blog/EU_domstolen_bekreftet_i_dag_at_datalagringsdirektivet_er_ulovlig.html + Tue, 8 Apr 2014 11:30:00 +0200 + <p>I dag kom endelig avgjørelsen fra EU-domstolen om +datalagringsdirektivet, som ikke overraskende ble dømt ulovlig og i +strid med borgernes grunnleggende rettigheter. Hvis du lurer på hva +datalagringsdirektivet er for noe, så er det +<a href="http://tv.nrk.no/program/koid75005313/tema-dine-digitale-spor-datalagringsdirektivet">en +flott dokumentar tilgjengelig hos NRK</a> som jeg tidligere +<a href="http://people.skolelinux.org/pere/blog/Dokumentaren_om_Datalagringsdirektivet_sendes_endelig_p__NRK.html">har +anbefalt</a> alle å se.</p> + +<p>Her er et liten knippe nyhetsoppslag om saken, og jeg regner med at +det kommer flere ut over dagen. Flere kan finnes +<a href="http://www.mylder.no/?drill=datalagringsdirektivet&intern=1">via +mylder</a>.</p> + +<p><ul> + +<li><a href="http://e24.no/digital/eu-domstolen-datalagringsdirektivet-er-ugyldig/22879592">EU-domstolen: +Datalagringsdirektivet er ugyldig</a> - e24.no 2014-04-08 + +<li><a href="http://www.aftenposten.no/nyheter/iriks/EU-domstolen-Datalagringsdirektivet-er-ulovlig-7529032.html">EU-domstolen: +Datalagringsdirektivet er ulovlig</a> - aftenposten.no 2014-04-08 + +<li><a href="http://www.aftenposten.no/nyheter/iriks/politikk/Krever-DLD-stopp-i-Norge-7530086.html">Krever +DLD-stopp i Norge</a> - aftenposten.no 2014-04-08 + +<li><a href="http://www.p4.no/story.aspx?id=566431">Apenes: - En +gledens dag</a> - p4.no 2014-04-08 + +<li><a href="http://www.nrk.no/norge/_-datalagringsdirektivet-er-ugyldig-1.11655929">EU-domstolen: +– Datalagringsdirektivet er ugyldig</a> - nrk.no 2014-04-08</li> + +<li><a href="http://www.vg.no/nyheter/utenriks/data-og-nett/eu-domstolen-datalagringsdirektivet-er-ugyldig/a/10130280/">EU-domstolen: +Datalagringsdirektivet er ugyldig</a> - vg.no 2014-04-08</li> + +<li><a href="http://www.dagbladet.no/2014/04/08/nyheter/innenriks/datalagringsdirektivet/personvern/32711646/">- +Vi bør skrote hele datalagringsdirektivet</a> - dagbladet.no +2014-04-08</li> + +<li><a href="http://www.digi.no/928137/eu-domstolen-dld-er-ugyldig">EU-domstolen: +DLD er ugyldig</a> - digi.no 2014-04-08</li> + +<li><a href="http://www.irishtimes.com/business/sectors/technology/european-court-declares-data-retention-directive-invalid-1.1754150">European +court declares data retention directive invalid</a> - irishtimes.com +2014-04-08</li> + +<li><a href="http://www.reuters.com/article/2014/04/08/us-eu-data-ruling-idUSBREA370F020140408?feedType=RSS">EU +court rules against requirement to keep data of telecom users</a> - +reuters.com 2014-04-08</li> + +</ul> +</p> + +<p>Jeg synes det er veldig fint at nok en stemme slår fast at +totalitær overvåkning av befolkningen er uakseptabelt, men det er +fortsatt like viktig å beskytte privatsfæren som før, da de +teknologiske mulighetene fortsatt finnes og utnyttes, og jeg tror +innsats i prosjekter som +<a href="https://wiki.debian.org/FreedomBox">Freedombox</a> og +<a href="http://www.dugnadsnett.no/">Dugnadsnett</a> er viktigere enn +noen gang.</p> + +<p><strong>Update 2014-04-08 12:10</strong>: Kronerullingen for å +stoppe datalagringsdirektivet i Norge gjøres hos foreningen +<a href="http://www.digitaltpersonvern.no/">Digitalt Personvern</a>, +som har samlet inn 843 215,- så langt men trenger nok mye mer hvis + +ikke Høyre og Arbeiderpartiet bytter mening i saken. Det var +<a href="http://www.holderdeord.no/parliament-issues/48650">kun +partinene Høyre og Arbeiderpartiet</a> som stemte for +Datalagringsdirektivet, og en av dem må bytte mening for at det skal +bli flertall mot i Stortinget. Se mer om saken +<a href="http://www.holderdeord.no/issues/69-innfore-datalagringsdirektivet">Holder +de ord</a>.</p> - A Raspberry Pi based batman-adv Mesh network node - http://people.skolelinux.org/pere/blog/A_Raspberry_Pi_based_batman_adv_Mesh_network_node.html - http://people.skolelinux.org/pere/blog/A_Raspberry_Pi_based_batman_adv_Mesh_network_node.html - Mon, 21 Oct 2013 11:40:00 +0200 - <p>The last few days I have been experimenting with -<a href="http://www.open-mesh.org/projects/batman-adv/wiki">the -batman-adv mesh technology</a>. I want to gain some experience to see -if it will fit <a href="https://wiki.debian.org/FreedomBox">the -Freedombox project</a>, and together with my neighbors try to build a -mesh network around the park where I live. Batman-adv is a layer 2 -mesh system ("ethernet" in other words), where the mesh network appear -as if all the mesh clients are connected to the same switch.</p> - -<p>My hardware of choice was the Linksys WRT54GL routers I had lying -around, but I've been unable to get them working with batman-adv. So -instead, I started playing with a -<a href="http://www.raspberrypi.org/">Raspberry Pi</a>, and tried to -get it working as a mesh node. My idea is to use it to create a mesh -node which function as a switch port, where everything connected to -the Raspberry Pi ethernet plug is connected (bridged) to the mesh -network. This allow me to hook a wifi base station like the Linksys -WRT54GL to the mesh by plugging it into a Raspberry Pi, and allow -non-mesh clients to hook up to the mesh. This in turn is useful for -Android phones using <a href="http://servalproject.org/">the Serval -Project</a> voip client, allowing every one around the playground to -phone and message each other for free. The reason is that Android -phones do not see ad-hoc wifi networks (they are filtered away from -the GUI view), and can not join the mesh without being rooted. But if -they are connected using a normal wifi base station, they can talk to -every client on the local network.</p> - -<p>To get this working, I've created a debian package -<a href="https://github.com/petterreinholdtsen/meshfx-node">meshfx-node</a> -and a script -<a href="https://github.com/petterreinholdtsen/meshfx-node/blob/master/build-rpi-mesh-node">build-rpi-mesh-node</a> -to create the Raspberry Pi boot image. I'm using Debian Jessie (and -not Raspbian), to get more control over the packages available. -Unfortunately a huge binary blob need to be inserted into the boot -image to get it booting, but I'll ignore that for now. Also, as -Debian lack support for the CPU features available in the Raspberry -Pi, the system do not use the hardware floating point unit. I hope -the routing performance isn't affected by the lack of hardware FPU -support.</p> - -<p>To create an image, run the following with a sudo enabled user -after inserting the target SD card into the build machine:</p> - -<p><pre> -% wget -O build-rpi-mesh-node \ - https://raw.github.com/petterreinholdtsen/meshfx-node/master/build-rpi-mesh-node -% sudo bash -x ./build-rpi-mesh-node > build.log 2>&1 -% dd if=/root/rpi/rpi_basic_jessie_$(date +%Y%m%d).img of=/dev/mmcblk0 bs=1M -% -</pre></p> - -<p>Booting with the resulting SD card on a Raspberry PI with a USB -wifi card inserted should give you a mesh node. At least it does for -me with a the wifi card I am using. The default mesh settings are the -ones used by the Oslo mesh project at Hackeriet, as I mentioned in -<a href="http://people.skolelinux.org/pere/blog/Oslo_community_mesh_network___with_NUUG_and_Hackeriet_at_Hausmania.html">an -earlier blog post about this mesh testing</a>.</p> - -<p>The mesh node was not horribly expensive either. I bought -everything over the counter in shops nearby. If I had ordered online -from the lowest bidder, the price should be significantly lower:</p> - -<p><table> - -<tr><th>Supplier</th><th>Model</th><th>NOK</th></tr> -<tr><td>Teknikkmagasinet</td><td>Raspberry Pi model B</td><td>349.90</td></tr> -<tr><td>Teknikkmagasinet</td><td>Raspberry Pi type B case</td><td>99.90</td></tr> -<tr><td>Lefdal</td><td>Jensen Air:Link 25150</td><td>295.-</td></tr> -<tr><td>Clas Ohlson</td><td>Kingston 16 GB SD card</td><td>199.-</td></tr> -<tr><td>Total cost</td><td></td><td>943.80</td></tr> - -</table></p> - -<p>Now my mesh network at home consist of one laptop in the basement -connected to my production network, one Raspberry Pi node on the 1th -floor that can be seen by my neighbor across the park, and one -play-node I use to develop the image building script. And some times -I hook up my work horse laptop to the mesh to test it. I look forward -to figuring out what kind of latency the batman-adv setup will give, -and how much packet loss we will experience around the park. :)</p> + ReactOS Windows clone - nice free software + http://people.skolelinux.org/pere/blog/ReactOS_Windows_clone___nice_free_software.html + http://people.skolelinux.org/pere/blog/ReactOS_Windows_clone___nice_free_software.html + Tue, 1 Apr 2014 12:10:00 +0200 + <p>Microsoft have announced that Windows XP reaches its end of life +2014-04-08, in 7 days. But there are heaps of machines still running +Windows XP, and depending on Windows XP to run their applications, and +upgrading will be expensive, both when it comes to money and when it +comes to the amount of effort needed to migrate from Windows XP to a +new operating system. Some obvious options (buy new a Windows +machine, buy a MacOSX machine, install Linux on the existing machine) +are already well known and covered elsewhere. Most of them involve +leaving the user applications installed on Windows XP behind and +trying out replacements or updated versions. In this blog post I want +to mention one strange bird that allow people to keep the hardware and +the existing Windows XP applications and run them on a free software +operating system that is Windows XP compatible.</p> + +<p><a href="http://www.reactos.org/">ReactOS</a> is a free software +operating system (GNU GPL licensed) working on providing a operating +system that is binary compatible with Windows, able to run windows +programs directly and to use Windows drivers for hardware directly. +The project goal is for Windows user to keep their existing machines, +drivers and software, and gain the advantages from user a operating +system without usage limitations caused by non-free licensing. It is +a Windows clone running directly on the hardware, so quite different +from the approach taken by <a href="http://www.winehq.org/">the Wine +project</a>, which make it possible to run Windows binaries on +Linux.</p> + +<p>The ReactOS project share code with the Wine project, so most +shared libraries available on Windows are already implemented already. +There is also a software manager like the one we are used to on Linux, +allowing the user to install free software applications with a simple +click directly from the Internet. Check out the +<a href="http://www.reactos.org/screenshots">screen shots on the +project web site</a> for an idea what it look like (it looks just like +Windows before metro).</p> + +<p>I do not use ReactOS myself, preferring Linux and Unix like +operating systems. I've tested it, and it work fine in a virt-manager +virtual machine. The browser, minesweeper, notepad etc is working +fine as far as I can tell. Unfortunately, my main test application +is the software included on a CD with the Lego Mindstorms NXT, which +seem to install just fine from CD but fail to leave any binaries on +the disk after the installation. So no luck with that test software. +No idea why, but hope someone else figure out and fix the problem. +I've tried the ReactOS Live ISO on a physical machine, and it seemed +to work just fine. If you like Windows and want to keep running your +old Windows binaries, check it out by +<a href="http://www.reactos.org/download">downloading</a> the +installation CD, the live CD or the preinstalled virtual machine +image.</p> - Perl library to control the Spykee robot moved to github - http://people.skolelinux.org/pere/blog/Perl_library_to_control_the_Spykee_robot_moved_to_github.html - http://people.skolelinux.org/pere/blog/Perl_library_to_control_the_Spykee_robot_moved_to_github.html - Sat, 19 Oct 2013 10:20:00 +0200 - <p>Back in 2010, I created a Perl library to talk to -<a href="http://en.wikipedia.org/wiki/Spykee">the Spykee robot</a> -(with two belts, wifi, USB and Linux) and made it available from my -web page. Today I concluded that it should move to a site that is -easier to use to cooperate with others, and moved it to github. If -you got a Spykee robot, you might want to check out -<a href="https://github.com/petterreinholdtsen/libspykee-perl">the -libspykee-perl github repository</a>.</p> + Debian Edu interview: Roger Marsal + http://people.skolelinux.org/pere/blog/Debian_Edu_interview__Roger_Marsal.html + http://people.skolelinux.org/pere/blog/Debian_Edu_interview__Roger_Marsal.html + Sun, 30 Mar 2014 11:40:00 +0200 + <p><a href="http://www.skolelinux.org/">Debian Edu / Skolelinux</a> +keep gaining new users. Some weeks ago, a person showed up on IRC, +<a href="irc://irc.debian.org/#debian-edu">#debian-edu</a>, with a +wish to contribute, and I managed to get a interview with this great +contributor Roger Marsal to learn more about his background.</p> + +<p><strong>Who are you, and how do you spend your days?</strong></p> + +<p>My name is Roger Marsal, I'm 27 years old (1986 generation) and I +live in Barcelona, Spain. I've got a strong business background and I +work as a patrimony manager and as a real estate agent. Additionally, +I've co-founded a British based tech company that is nowadays on the +last development phase of a new social networking concept.</p> + +<p>I'm a Linux enthusiast that started its journey with Ubuntu four years +ago and have recently switched to Debian seeking rock solid stability +and as a necessary step to gain expertise.</p> + +<p>In a nutshell, I spend my days working and learning as much as I +can to face both my job, entrepreneur project and feed my Linux +hunger.</p> + +<p><strong>How did you get in contact with the Skolelinux / Debian Edu +project?</strong></p> + +<p>I discovered the <a href="http://www.ltsp.org/">LTSP</a> advantages +with "Ubuntu 12.04 alternate install" and after a year of use I +started looking for an alternative. Even though I highly value and +respect the Ubuntu project, I thought it was necessary for me to +change to a more robust and stable alternative. As far as I was using +Debian on my personal laptop I thought it would be fine to install +Debian and configure an LTSP server myself. Surprised, I discovered +that the Debian project also supported a kind of Edubuntu equivalent, +and after having some pain I obtained a Debian Edu network up and +running. I just loved it.</p> + +<p><strong>What do you see as the advantages of Skolelinux / Debian +Edu?</strong></p> + +<p>I found a main advantage in that, once you know "the tips and +tricks", a new installation just works out of the box. It's the most +complete alternative I've found to create an LTSP network. All the +other distributions seems to be made of plastic, Debian Edu seems to +be made of steel.</p> + +<p><strong>What do you see as the disadvantages of Skolelinux / Debian +Edu?</strong></p> + +<p>I found two main disadvantages.</p> + +<p>I'm not an expert but I've got notions and I had to spent a considerable +amount of time trying to bring up a standard network topology. I'm quite +stubborn and I just worked until I did but I'm sure many people with few +resources (not big schools, but academies for example) would have switched +or dropped.</p> + +<p>It's amazing how such a complex system like Debian Edu has achieved +this out-of-the-box state. Even though tweaking without breaking gets +more difficult, as more factors have to be considered. This can +discourage many people too.</p> + +<p><strong>Which free software do you use daily?</strong></p> + +<p>I use Debian, Firefox, Okular, Inkscape, LibreOffice and +Virtualbox.</p> + + +<p><strong>Which strategy do you believe is the right one to use to +get schools to use free software?</strong></p> + +<p>I don't think there is a need for a particular strategy. The free +attribute in both "freedom" and "no price" meanings is what will +really bring free software to schools. In my experience I can think of +the <a href="http://www.r-project.org/">"R" statistical language</a>; a +few years a ago was an extremely nerd tool for university people. +Today it's being increasingly used to teach statistics at many +different level of studies. I believe free and open software will +increasingly gain popularity, but I'm sure schools will be one of the +first scenarios where this will happen.</p> - Good causes: Debian Outreach Program for Women, EFF documenting the spying and Open access in Norway - http://people.skolelinux.org/pere/blog/Good_causes__Debian_Outreach_Program_for_Women__EFF_documenting_the_spying_and_Open_access_in_Norway.html - http://people.skolelinux.org/pere/blog/Good_causes__Debian_Outreach_Program_for_Women__EFF_documenting_the_spying_and_Open_access_in_Norway.html - Tue, 15 Oct 2013 21:30:00 +0200 - <p>The last few days I came across a few good causes that should get -wider attention. I recommend signing and donating to each one of -these. :)</p> - -<p>Via <a href="http://www.debian.org/News/weekly/2013/18/">Debian -Project News for 2013-10-14</a> I came across the Outreach Program for -Women program which is a Google Summer of Code like initiative to get -more women involved in free software. One debian sponsor has offered -to match <a href="http://debian.ch/opw2013">any donation done to Debian -earmarked</a> for this initiative. I donated a few minutes ago, and -hope you will to. :)</p> - -<p>And the Electronic Frontier Foundation just announced plans to -create <a href="https://supporters.eff.org/donate/nsa-videos">video -documentaries about the excessive spying</a> on every Internet user that -take place these days, and their need to fund the work. I've already -donated. Are you next?</p> - -<p>For my Norwegian audience, the organisation Studentenes og -Akademikernes Internasjonale Hjelpefond is collecting signatures for a -statement under the heading -<a href="http://saih.no/Bloggers_United/">Bloggers United for Open -Access</a> for those of us asking for more focus on open access in the -Norwegian government. So far 499 signatures. I hope you will sign it -too.</p> + Dokumentaren om Datalagringsdirektivet sendes endelig på NRK + http://people.skolelinux.org/pere/blog/Dokumentaren_om_Datalagringsdirektivet_sendes_endelig_p__NRK.html + http://people.skolelinux.org/pere/blog/Dokumentaren_om_Datalagringsdirektivet_sendes_endelig_p__NRK.html + Wed, 26 Mar 2014 09:50:00 +0100 + <p><a href="http://www.nuug.no/">Foreningen NUUG</a> melder i natt at +NRK nå har bestemt seg for +<a href="http://www.nuug.no/news/NRK_viser_filmen_om_Datalagringsdirektivet_f_rste_gang_2014_03_31.shtml">når +den norske dokumentarfilmen om datalagringsdirektivet skal +sendes</a> (se <a href="http://www.imdb.com/title/tt2832844/">IMDB</a> +for detaljer om filmen) . Første visning blir på NRK2 mandag +2014-03-31 kl. 19:50, og deretter visninger onsdag 2014-04-02 +kl. 12:30, fredag 2014-04-04 kl. 19:40 og søndag 2014-04-06 kl. 15:10. +Jeg har sett dokumentaren, og jeg anbefaler enhver å se den selv. Som +oppvarming mens vi venter anbefaler jeg Bjørn Stærks kronikk i +Aftenposten fra i går, +<a href="http://www.aftenposten.no/meninger/kronikker/Autoritar-gjokunge-7514915.html">Autoritær +gjøkunge</a>, der han gir en grei skisse av hvor ille det står til med +retten til privatliv og beskyttelsen av demokrati i Norge og resten +verden, og helt riktig slår fast at det er vi i databransjen som +sitter med nøkkelen til å gjøre noe med dette. Jeg har involvert meg +i prosjektene <a href="http://www.dugnadsnett.no/">dugnadsnett.no</a> +og <a href="https://wiki.debian.org/FreedomBox">FreedomBox</a> for å +forsøke å gjøre litt selv for å bedre situasjonen, men det er mye +hardt arbeid fra mange flere enn meg som gjenstår før vi kan sies å ha +gjenopprettet balansen.</p> + +<p>Jeg regner med at nettutgaven dukker opp på +<a href="http://tv.nrk.no/program/koid75005313/tema-dine-digitale-spor-datalagringsdirektivet">NRKs +side om filmen om datalagringsdirektivet</a> om fem dager. Hold et +øye med siden, og tips venner og slekt om at de også bør se den.</p> - Oslo community mesh network - with NUUG and Hackeriet at Hausmania - http://people.skolelinux.org/pere/blog/Oslo_community_mesh_network___with_NUUG_and_Hackeriet_at_Hausmania.html - http://people.skolelinux.org/pere/blog/Oslo_community_mesh_network___with_NUUG_and_Hackeriet_at_Hausmania.html - Fri, 11 Oct 2013 14:10:00 +0200 - <p>Wireless mesh networks are self organising and self healing -networks that can be used to connect computers across small and large -areas, depending on the radio technology used. Normal wifi equipment -can be used to create home made radio networks, and there are several -successful examples like -<a href="http://www.freifunk.net/">Freifunk</a> and -<a href="http://www.awmn.net/">Athens Wireless Metropolitan Network</a> -(see -<a href="http://en.wikipedia.org/wiki/List_of_wireless_community_networks_by_region#Greece">wikipedia -for a large list</a>) around the globe. To give you an idea how it -work, check out the nice overview of the Kiel Freifunk community which -can be seen from their -<a href="http://freifunk.in-kiel.de/ffmap/nodes.html">dynamically -updated node graph and map</a>, where one can see how the mesh nodes -automatically handle routing and recover from nodes disappearing. -There is also a small community mesh network group in Oslo, Norway, -and that is the main topic of this blog post.</p> - -<p>I've wanted to check out mesh networks for a while now, and hoped -to do it as part of my involvement with the <a -href="http://www.nuug.no/">NUUG member organisation</a> community, and -my recent involvement in -<a href="https://wiki.debian.org/FreedomBox">the Freedombox project</a> -finally lead me to give mesh networks some priority, as I suspect a -Freedombox should use mesh networks to connect neighbours and family -when possible, given that most communication between people are -between those nearby (as shown for example by research on Facebook -communication patterns). It also allow people to communicate without -any central hub to tap into for those that want to listen in on the -private communication of citizens, which have become more and more -important over the years.</p> - -<p>So far I have only been able to find one group of people in Oslo -working on community mesh networks, over at the hack space -<a href="http://hackeriet.no/">Hackeriet</a> at Husmania. They seem to -have started with some Freifunk based effort using OLSR, called -<a href="http://oslo.freifunk.net/index.php?title=Main_Page">the Oslo -Freifunk project</a>, but that effort is now dead and the people -behind it have moved on to a batman-adv based system called -<a href="http://meshfx.org/trac">meshfx</a>. Unfortunately the wiki -site for the Oslo Freifunk project is no longer possible to update to -reflect this fact, so the old project page can't be updated to point to -the new project. A while back, the people at Hackeriet invited people -from the Freifunk community to Oslo to talk about mesh networks. I -came across this video where Hans Jørgen Lysglimt interview the -speakers about this talk (from -<a href="https://www.youtube.com/watch?v=N2Kd7CLkhSY">youtube</a>):</p> - -<p><iframe width="420" height="315" src="https://www.youtube.com/embed/N2Kd7CLkhSY" frameborder="0" allowfullscreen></iframe></p> - -<p>I mentioned OLSR and batman-adv, which are mesh routing protocols. -There are heaps of different protocols, and I am still struggling to -figure out which one would be "best" for some definitions of best, but -given that the community mesh group in Oslo is so small, I believe it -is best to hook up with the existing one instead of trying to create a -completely different setup, and thus I have decided to focus on -batman-adv for now. It sure help me to know that the very cool -<a href="http://www.servalproject.org/">Serval project in Australia</a> -is using batman-adv as their meshing technology when it create a self -organizing and self healing telephony system for disaster areas and -less industrialized communities. Check out this cool video presenting -that project (from -<a href="https://www.youtube.com/watch?v=30qNfzJCQOA">youtube</a>):</p> - -<p><iframe width="560" height="315" src="https://www.youtube.com/embed/30qNfzJCQOA" frameborder="0" allowfullscreen></iframe></p> - -<p>According to the wikipedia page on -<a href="http://en.wikipedia.org/wiki/Wireless_mesh_network">Wireless -mesh network</a> there are around 70 competing schemes for routing -packets across mesh networks, and OLSR, B.A.T.M.A.N. and -B.A.T.M.A.N. advanced are protocols used by several free software -based community mesh networks.</p> - -<p>The batman-adv protocol is a bit special, as it provide layer 2 -(as in ethernet ) routing, allowing ipv4 and ipv6 to work on the same -network. One way to think about it is that it provide a mesh based -vlan you can bridge to or handle like any other vlan connected to your -computer. The required drivers are already in the Linux kernel at -least since Debian Wheezy, and it is fairly easy to set up. A -<a href="http://www.open-mesh.org/projects/batman-adv/wiki/Quick-start-guide">good -introduction</a> is available from the Open Mesh project. These are -the key settings needed to join the Oslo meshfx network:</p> - -<p><table> -<tr><th>Setting</th><th>Value</th></tr> -<tr><td>Protocol / kernel module</td><td>batman-adv</td></tr> -<tr><td>ESSID</td><td>meshfx@hackeriet</td></tr> -<td>Channel / Frequency</td><td>11 / 2462</td></tr> -<td>Cell ID</td><td>02:BA:00:00:00:01</td> -</table></p> - -<p>The reason for setting ad-hoc wifi Cell ID is to work around bugs -in firmware used in wifi card and wifi drivers. (See a nice post from -VillageTelco about -"<a href="http://tiebing.blogspot.no/2009/12/ad-hoc-cell-splitting-re-post-original.html">Information -about cell-id splitting, stuck beacons, and failed IBSS merges!</a> -for details.) When these settings are activated and you have some -other mesh node nearby, your computer will be connected to the mesh -network and can communicate with any mesh node that is connected to -any of the nodes in your network of nodes. :)</p> - -<p>My initial plan was to reuse my old Linksys WRT54GL as a mesh node, -but that seem to be very hard, as I have not been able to locate a -firmware supporting batman-adv. If anyone know how to use that old -wifi access point with batman-adv these days, please let me know.</p> - -<p>If you find this project interesting and want to join, please join -us on IRC, either channel -<a href="irc://irc.freenode.net/#oslohackerspace">#oslohackerspace</a> -or <a href="irc://irc.freenode.net/#nuug">#nuug</a> on -irc.freenode.net.</p> - -<p>While investigating mesh networks in Oslo, I came across an old -research paper from the university of Stavanger and Telenor Research -and Innovation called -<a href="http://folk.uio.no/paalee/publications/netrel-egeland-iswcs-2008.pdf">The -reliability of wireless backhaul mesh networks</a> and elsewhere -learned that Telenor have been experimenting with mesh networks at -Grünerløkka in Oslo. So mesh networks are also interesting for -commercial companies, even though Telenor discovered that it was hard -to figure out a good business plan for mesh networking and as far as I -know have closed down the experiment. Perhaps Telenor or others would -be interested in a cooperation?</p> - -<p><strong>Update 2013-10-12</strong>: I was just -<a href="http://lists.alioth.debian.org/pipermail/freedombox-discuss/2013-October/005900.html">told -by the Serval project developers</a> that they no longer use -batman-adv (but are compatible with it), but their own crypto based -mesh system.</p> + Public Trusted Timestamping services for everyone + http://people.skolelinux.org/pere/blog/Public_Trusted_Timestamping_services_for_everyone.html + http://people.skolelinux.org/pere/blog/Public_Trusted_Timestamping_services_for_everyone.html + Tue, 25 Mar 2014 12:50:00 +0100 + <p>Did you ever need to store logs or other files in a way that would +allow it to be used as evidence in court, and needed a way to +demonstrate without reasonable doubt that the file had not been +changed since it was created? Or, did you ever need to document that +a given document was received at some point in time, like some +archived document or the answer to an exam, and not changed after it +was received? The problem in these settings is to remove the need to +trust yourself and your computers, while still being able to prove +that a file is the same as it was at some given time in the past.</p> + +<p>A solution to these problems is to have a trusted third party +"stamp" the document and verify that at some given time the document +looked a given way. Such +<a href="https://en.wikipedia.org/wiki/Notarius">notarius</a> service +have been around for thousands of years, and its digital equivalent is +called a +<a href="http://en.wikipedia.org/wiki/Trusted_timestamping">trusted +timestamping service</a>. <a href="http://www.ietf.org/">The Internet +Engineering Task Force</a> standardised how such service could work a +few years ago as <a href="http://tools.ietf.org/html/rfc3161">RFC +3161</a>. The mechanism is simple. Create a hash of the file in +question, send it to a trusted third party which add a time stamp to +the hash and sign the result with its private key, and send back the +signed hash + timestamp. Both email, FTP and HTTP can be used to +request such signature, depending on what is provided by the service +used. Anyone with the document and the signature can then verify that +the document matches the signature by creating their own hash and +checking the signature using the trusted third party public key. +There are several commercial services around providing such +timestamping. A quick search for +"<a href="https://duckduckgo.com/?q=rfc+3161+service">rfc 3161 +service</a>" pointed me to at least +<a href="https://www.digistamp.com/technical/how-a-digital-time-stamp-works/">DigiStamp</a>, +<a href="http://www.quovadisglobal.co.uk/CertificateServices/SigningServices/TimeStamp.aspx">Quo +Vadis</a>, +<a href="https://www.globalsign.com/timestamp-service/">Global Sign</a> +and <a href="http://www.globaltrustfinder.com/TSADefault.aspx">Global +Trust Finder</a>. The system work as long as the private key of the +trusted third party is not compromised.</p> + +<p>But as far as I can tell, there are very few public trusted +timestamp services available for everyone. I've been looking for one +for a while now. But yesterday I found one over at +<a href="https://www.pki.dfn.de/zeitstempeldienst/">Deutches +Forschungsnetz</a> mentioned in +<a href="http://www.d-mueller.de/blog/dealing-with-trusted-timestamps-in-php-rfc-3161/">a +blog by David Müller</a>. I then found +<a href="http://www.rz.uni-greifswald.de/support/dfn-pki-zertifikate/zeitstempeldienst.html">a +good recipe on how to use the service</a> over at the University of +Greifswald.</p> + +<p><a href="http://www.openssl.org/">The OpenSSL library</a> contain +both server and tools to use and set up your own signing service. See +the ts(1SSL), tsget(1SSL) manual pages for more details. The +following shell script demonstrate how to extract a signed timestamp +for any file on the disk in a Debian environment:</p> + +<p><blockquote><pre> +#!/bin/sh +set -e +url="http://zeitstempel.dfn.de" +caurl="https://pki.pca.dfn.de/global-services-ca/pub/cacert/chain.txt" +reqfile=$(mktemp -t tmp.XXXXXXXXXX.tsq) +resfile=$(mktemp -t tmp.XXXXXXXXXX.tsr) +cafile=chain.txt +if [ ! -f $cafile ] ; then + wget -O $cafile "$caurl" +fi +openssl ts -query -data "$1" -cert | tee "$reqfile" \ + | /usr/lib/ssl/misc/tsget -h "$url" -o "$resfile" +openssl ts -reply -in "$resfile" -text 1>&2 +openssl ts -verify -data "$1" -in "$resfile" -CAfile "$cafile" 1>&2 +base64 < "$resfile" +rm "$reqfile" "$resfile" +</pre></blockquote></p> + +<p>The argument to the script is the file to timestamp, and the output +is a base64 encoded version of the signature to STDOUT and details +about the signature to STDERR. Note that due to +<a href="http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=742553">a bug +in the tsget script</a>, you might need to modify the included script +and remove the last line. Or just write your own HTTP uploader using +curl. :) Now you too can prove and verify that files have not been +changed.</p> + +<p>But the Internet need more public trusted timestamp services. +Perhaps something for <a href="http://www.uninett.no/">Uninett</a> or +my work place the <a href="http://www.uio.no/">University of Oslo</a> +to set up?</p> - Skolelinux / Debian Edu 7.1 install and overview video from Marcelo Salvador - http://people.skolelinux.org/pere/blog/Skolelinux___Debian_Edu_7_1_install_and_overview_video_from_Marcelo_Salvador.html - http://people.skolelinux.org/pere/blog/Skolelinux___Debian_Edu_7_1_install_and_overview_video_from_Marcelo_Salvador.html - Tue, 8 Oct 2013 17:10:00 +0200 - <p>The other day I was pleased and surprised to discover that Marcelo -Salvador had published a -<a href="https://www.youtube.com/watch?v=w-GgpdqgLFc">video on -Youtube</a> showing how to install the standalone Debian Edu / -Skolelinux profile. This is the profile intended for use at home or -on laptops that should not be integrated into the provided network -services (no central home directory, no Kerberos / LDAP directory etc, -in other word a single user machine). The result is 11 minutes long, -and show some user applications (seem to be rather randomly picked). -Missed a few of my favorites like celestia, planets and chromium -showing the <a href="http://www.zygotebody.com/">Zygote Body 3D model -of the human body</a>, but I guess he did not know about those or find -other programs more interesting. :) And the video do not show the -advantages I believe is one of the most valuable featuers in Debian -Edu, its central school server making it possible to run hundreds of -computers without hard drives by installing one central -<a href="http://www.ltsp.org/">LTSP server</a>.</p> - -<p>Anyway, check out the video, embedded below and linked to above:</p> - -<iframe width="420" height="315" src="http://www.youtube.com/embed/w-GgpdqgLFc" frameborder="0" allowfullscreen></iframe> - -<p>Are there other nice videos demonstrating Skolelinux? Please let -me know. :)</p> + Video DVD reader library / python-dvdvideo - nice free software + http://people.skolelinux.org/pere/blog/Video_DVD_reader_library___python_dvdvideo___nice_free_software.html + http://people.skolelinux.org/pere/blog/Video_DVD_reader_library___python_dvdvideo___nice_free_software.html + Fri, 21 Mar 2014 15:25:00 +0100 + <p>Keeping your DVD collection safe from scratches and curious +children fingers while still having it available when you want to see a +movie is not straight forward. My preferred method at the moment is +to store a full copy of the ISO on a hard drive, and use VLC, Popcorn +Hour or other useful players to view the resulting file. This way the +subtitles and bonus material are still available and using the ISO is +just like inserting the original DVD record in the DVD player.</p> + +<p>Earlier I used dd for taking security copies, but it do not handle +DVDs giving read errors (which are quite a few of them). I've also +tried using +<a href="http://people.skolelinux.org/pere/blog/Ripping_problematic_DVDs_using_dvdbackup_and_genisoimage.html">dvdbackup +and genisoimage</a>, but these days I use the marvellous python library +and program +<a href="http://bblank.thinkmo.de/blog/new-software-python-dvdvideo">python-dvdvideo</a> +written by Bastian Blank. It is +<a href="http://packages.qa.debian.org/p/python-dvdvideo.html">in Debian +already</a> and the binary package name is python3-dvdvideo. Instead +of trying to read every block from the DVD, it parses the file +structure and figure out which block on the DVD is actually in used, +and only read those blocks from the DVD. This work surprisingly well, +and I have been able to almost backup my entire DVD collection using +this method.</p> + +<p>So far, python-dvdvideo have failed on between 10 and +20 DVDs, which is a small fraction of my collection. The most common +problem is +<a href="https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=720831">DVDs +using UTF-16 instead of UTF-8 characters</a>, which according to +Bastian is against the DVD specification (and seem to cause some +players to fail too). A rarer problem is what seem to be inconsistent +DVD structures, as the python library +<a href="https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=723079">claim +there is a overlap between objects</a>. An equally rare problem claim +<a href="https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=741878">some +value is out of range</a>. No idea what is going on there. I wish I +knew enough about the DVD format to fix these, to ensure my movie +collection will stay with me in the future.</p> + +<p>So, if you need to keep your DVDs safe, back them up using +python-dvdvideo. :)</p> - Finally, Debian Edu Wheezy is released today! - http://people.skolelinux.org/pere/blog/Finally__Debian_Edu_Wheezy_is_released_today_.html - http://people.skolelinux.org/pere/blog/Finally__Debian_Edu_Wheezy_is_released_today_.html - Sun, 29 Sep 2013 10:20:00 +0200 - <p>A few hours ago, the announcement for the first stable release of -Debian Edu Wheezy went out from the Debian publicity team. The -complete announcement text can be found at -<a href="http://www.debian.org/News/2013/20130928">the Debian News -section</a>, translated to several languages. Please check it out.</p> - -<p>There is one minor known problem that we will fix very soon. One -can not install a amd64 Thin Client Server using PXE, as the /var/ -partition is too small. A workaround is to extend the partition (use -lvresize + resize2fs in tty 2 while installing).</p> + Norsk utgave av Alaveteli / WhatDoTheyKnow på trappene + http://people.skolelinux.org/pere/blog/Norsk_utgave_av_Alaveteli___WhatDoTheyKnow_p__trappene.html + http://people.skolelinux.org/pere/blog/Norsk_utgave_av_Alaveteli___WhatDoTheyKnow_p__trappene.html + Sun, 16 Mar 2014 09:30:00 +0100 + <p>Det offentlige Norge har mye kunnskap og informasjon. Men hvordan +kan en få tilgang til den på en enkel måte? Takket være et lite +knippe lover og tilhørende forskrifter, blant annet +<a href="http://lovdata.no/dokument/NL/lov/2006-05-19-16">offentlighetsloven</a>, +<a href="http://lovdata.no/dokument/NL/lov/2003-05-09-31">miljøinformasjonsloven</a> +og +<a href="http://lovdata.no/dokument/NL/lov/1967-02-10/">forvaltningsloven</a> +har en rett til å spørre det offentlige og få svar. Men det finnes +intet offentlig arkiv over hva andre har spurt om, og dermed risikerer en +å måtte forstyrre myndighetene gang på gang for å få tak i samme +informasjonen på nytt. <a href="http://www.mysociety.org/">Britiske +mySociety</a> har laget tjenesten +<a href="http://www.whatdotheyknow.com/">WhatDoTheyKnow</a> som gjør +noe med dette. I Storbritannia blir WhatdoTheyKnow brukt i +<a href="http://www.mysociety.org/2011/07/01/whatdotheyknows-share-of-central-government-foi-requests-q2-2011/">ca +15% av alle innsynsforespørsler mot sentraladministrasjonen</a>. +Prosjektet heter <a href="http://www.alaveteli.org/">Alaveteli</A>, og +er takk i bruk en rekke steder etter at løsningen ble generalisert og +gjort mulig å oversette. Den hjelper borgerne med å be om innsyn, +rådgir ved purringer og klager og lar alle se hvilke henvendelser som +er sendt til det offentlige og hvilke svar som er kommet inn, i et +søkpart arkiv. Her i Norge holder vi i foreningen NUUG på å få opp en +norsk utgave av Alaveteli, og her trenger vi din hjelp med +oversettelsen.</p> + +<p>Så langt er 76 % av Alaveteli oversatt til norsk bokmål, men vi +skulle gjerne vært oppe i 100 % før lansering. Oversettelsen gjøres +på <a href="https://www.transifex.com/projects/p/alaveteli/">Transifex, +der enhver som registrerer seg</a> og ber om tilgang til +bokmålsoversettelsen får bidra. Vi har satt opp en test av tjenesten +(som ikke sender epost til det offentlige, kun til oss som holder på å +sette opp tjenesten) på maskinen +<a href="http://alaveteli-dev.nuug.no/">alaveteli-dev.nuug.no</a>, der +en kan se hvordan de oversatte meldingen blir seende ut på nettsiden. +Når tjenesten lanseres vil den hete +<a href="https://www.mimesbrønn.no/">Mimes brønn</a>, etter +visdomskilden som Odin måtte gi øyet sitt for å få drikke i. Den +nettsiden er er ennå ikke klar til bruk.</p> + +<p>Hvis noen vil oversette til nynorsk også, så skal vi finne ut +hvordan vi lager en flerspråklig tjeneste. Men i første omgang er +fokus på bokmålsoversettelsen, der vi selv har nok peiling til å ha +fått oversatt 76%, men trenger hjelp for å komme helt i mål. :)</p> - Videos about the Freedombox project - for inspiration and learning - http://people.skolelinux.org/pere/blog/Videos_about_the_Freedombox_project___for_inspiration_and_learning.html - http://people.skolelinux.org/pere/blog/Videos_about_the_Freedombox_project___for_inspiration_and_learning.html - Fri, 27 Sep 2013 14:10:00 +0200 - <p>The <a href="http://www.freedomboxfoundation.org/">Freedombox -project</a> have been going on for a while, and have presented the -vision, ideas and solution several places. Here is a little -collection of videos of talks and presentation of the project.</p> - -<ul> - -<li><a href="http://www.youtube.com/watch?v=ukvUz5taxvA">FreedomBox - -2,5 minute marketing film</a> (Youtube)</li> - -<li><a href="http://www.youtube.com/watch?v=SzW25QTVWsE">Eben Moglen -discusses the Freedombox on CBS news 2011</a> (Youtube)</li> - -<li><a href="http://www.youtube.com/watch?v=Ae8SZbxfE0g">Eben Moglen - -Freedom in the Cloud - Software Freedom, Privacy and and Security for -Web 2.0 and Cloud computing at ISOC-NY Public Meeting 2010</a> -(Youtube)</li> - -<li><a href="http://www.youtube.com/watch?v=vNaIji_3xBE">Fosdem 2011 -Keynote by Eben Moglen presenting the Freedombox</a> (Youtube)</li> - -<li><a href="http://www.youtube.com/watch?v=9bDDUyJSQ9s">Presentation of -the Freedombox by James Vasile at Elevate in Gratz 2011</a> (Youtube)</li> - -<li><a href="http://www.youtube.com/watch?v=zQTmnk27g9s"> Freedombox - -Discovery, Identity, and Trust by Nick Daly at Freedombox Hackfest New -York City in 2012</a> (Youtube)</li> - -<li><a href="http://www.youtube.com/watch?v=tkbSB4Ba7Ck">Introduction -to the Freedombox at Freedombox Hackfest New York City in 2012</a> -(Youtube)</li> - -<li><a href="http://www.youtube.com/watch?v=z-P2Jaeg0aQ">Freedom, Out -of the Box! by Bdale Garbee at linux.conf.au Ballarat, 2012</a> (Youtube) </li> + Freedombox on Dreamplug, Raspberry Pi and virtual x86 machine + http://people.skolelinux.org/pere/blog/Freedombox_on_Dreamplug__Raspberry_Pi_and_virtual_x86_machine.html + http://people.skolelinux.org/pere/blog/Freedombox_on_Dreamplug__Raspberry_Pi_and_virtual_x86_machine.html + Fri, 14 Mar 2014 11:00:00 +0100 + <p>The <a href="https://wiki.debian.org/FreedomBox">Freedombox +project</a> is working on providing the software and hardware for +making it easy for non-technical people to host their data and +communication at home, and being able to communicate with their +friends and family encrypted and away from prying eyes. It has been +going on for a while, and is slowly progressing towards a new test +release (0.2).</p> + +<p>And what day could be better than the Pi day to announce that the +new version will provide "hard drive" / SD card / USB stick images for +Dreamplug, Raspberry Pi and VirtualBox (or any other virtualization +system), and can also be installed using a Debian installer preseed +file. The Debian based Freedombox is now based on Debian Jessie, +where most of the needed packages used are already present. Only one, +the freedombox-setup package, is missing. To try to build your own +boot image to test the current status, fetch the freedom-maker scripts +and build using +<a href="http://packages.qa.debian.org/vmdebootstrap">vmdebootstrap</a> +with a user with sudo access to become root: -<li><a href="https://archive.fosdem.org/2013/schedule/event/freedombox/">Freedombox -1.0 by Eben Moglen and Bdale Garbee at Fosdem 2013</a> (FOSDEM) </li> - -<li><a href="http://www.youtube.com/watch?v=e1LpYX2zVYg">What is the -FreedomBox today by Bdale Garbee at Debconf13 in Vaumarcus -2013</a> (Youtube)</li> - -</ul> +<pre> +git clone http://anonscm.debian.org/git/freedombox/freedom-maker.git \ + freedom-maker +sudo apt-get install git vmdebootstrap mercurial python-docutils \ + mktorrent extlinux virtualbox qemu-user-static binfmt-support \ + u-boot-tools +make -C freedom-maker dreamplug-image raspberry-image virtualbox-image +</pre> + +<p>Root access is needed to run debootstrap and mount loopback +devices. See the README for more details on the build. If you do not +want all three images, trim the make line. But note that thanks to <a +href="https://bugs.debian.org/741407">a race condition in +vmdebootstrap</a>, the build might fail without the patch to the +kpartx call.</p> + +<p>If you instead want to install using a Debian CD and the preseed +method, boot a Debian Wheezy ISO and use this boot argument to load +the preseed values:</p> -<p>A larger list is available from -<a href="https://wiki.debian.org/FreedomBox/TalksAndPresentations">the -Freedombox Wiki</a>.</p> - -<p>On other news, I am happy to report that Freedombox based on Debian -Jessie is coming along quite well, and soon both Owncloud and using -Tor should be available for testers of the Freedombox solution. :) In -a few weeks I hope everything needed to test it is included in Debian. -The withsqlite package is already in Debian, and the plinth package is -pending in NEW. The third and vital part of that puzzle is the -metapackage/setup framework, which is still pending an upload. Join -us on <a href="irc://irc.debian.org:6667/%23freedombox">IRC -(#freedombox on irc.debian.org)</a> and +<pre> +url=<a href="http://www.reinholdtsen.name/freedombox/preseed-jessie.dat">http://www.reinholdtsen.name/freedombox/preseed-jessie.dat</a> +</pre> + +<p>But note that due to <a href="https://bugs.debian.org/740673">a +recently introduced bug in apt in Jessie</a>, the installer will +currently hang while setting up APT sources. Killing the +'<tt>apt-cdrom ident</tt>' process when it hang a few times during the +installation will get the installation going. This affect all +installations in Jessie, and I expect it will be fixed soon.</p> + +<p>Give it a go and let us know how it goes on the mailing list, and help +us get the new release published. :) Please join us on +<a href="irc://irc.debian.org:6667/%23freedombox">IRC (#freedombox on +irc.debian.org)</a> and <a href="http://lists.alioth.debian.org/mailman/listinfo/freedombox-discuss">the mailing list</a> if you want to help make this vision come true.</p> - Third and probably last beta release of Debian Edu Wheezy - http://people.skolelinux.org/pere/blog/Third_and_probably_last_beta_release_of_Debian_Edu_Wheezy.html - http://people.skolelinux.org/pere/blog/Third_and_probably_last_beta_release_of_Debian_Edu_Wheezy.html - Mon, 16 Sep 2013 21:30:00 +0200 - <p>The third wheezy based beta release of Debian Edu was wrapped up -today. This is the release announcement from Holger Levsen:</p> - -<blockquote> -<p>Hi,</p> - -<p>it is my pleasure to announce the third beta release (beta 2 for -short) of <a href="http://www.skolelinux.org/">Debian Edu / -Skolelinux</a> based on Debian Wheezy!</p> - -<p>Please test these images extensivly, if no new problems are found -we plan to do this final Debian Edu Wheezy release this coming -weekend. We are not aware of any major problems or blockers in beta2, -if you find something, please notify us immediately!</p> - -<p>(More about the remaining steps for the Edu Wheezy release in -another mail to the edu list tonight or tomorrow...)</p> - -<p>Noteworthy changes and software updates for Debian Edu 7.1+edu0~b2 -compared to beta1:</p> - -<ul> - -<li>The KDE proxy setup has been adjusted to use the provided wpad.dat. This -also gets Chromium to use this proxy.</li> -<li>Install kdepim-groupware with KDE desktops to make sure korganizer -understand ical/dav sources.</li> -<li>Increased default maximum size of /var/spool/squid and /skole/backup on the -main server.</li> -<li>A source DVD image containing all source packages is now available as well.</li> -<li>Updates for chromium (29.0.1547.57-1~deb7u1), imagemagick -(6.7.7.10-5+deb7u2), php5 (5.4.4-14+deb7u4), libmodplug -(0.8.8.4-3+deb7u1+git20130828), tiff (4.0.2-6+deb7u2), linux-image -(3.2.0-4-486_3.2.46-1+deb7u1).</li> - -</ul> - -<p>Where to get it:</p> - -<p>To download the multiarch netinstall CD release you can use</p> - -<ul> -<li><a href="ftp://ftp.skolelinux.org/skolelinux-cd/wheezy/debian-edu-7.1+edu0~b2-CD.iso">ftp://ftp.skolelinux.org/skolelinux-cd/wheezy/debian-edu-7.1+edu0~b2-CD.iso</a></li> -<li><a href="http://ftp.skolelinux.org/skolelinux-cd/wheezy/debian-edu-7.1+edu0~b2-CD.iso">http://ftp.skolelinux.org/skolelinux-cd/wheezy/debian-edu-7.1+edu0~b2-CD.iso</a></li> -<li>rsync -avzP ftp.skolelinux.org::skolelinux-cd/wheezy/debian-edu-7.1+edu0~b2-CD.iso .</li> -</ul> - -<p>The SHA1SUM of this image is: 3a1c89f4666df80eebcd46c5bf5fedb866f9472f</p> - -<p>To download the multiarch USB stick ISO release you can use -<ul> -<li><a href="ftp://ftp.skolelinux.org/skolelinux-cd/wheezy/debian-edu-7.1+edu0~b2-USB.iso">ftp://ftp.skolelinux.org/skolelinux-cd/wheezy/debian-edu-7.1+edu0~b2-USB.iso</a></li> -<li><a href="http://ftp.skolelinux.org/skolelinux-cd/wheezy/debian-edu-7.1+edu0~b2-USB.iso">http://ftp.skolelinux.org/skolelinux-cd/wheezy/debian-edu-7.1+edu0~b2-USB.iso</a></li> -<li>rsync -avzP ftp.skolelinux.org::skolelinux-cd/wheezy/debian-edu-7.1+edu0~b2-USB.iso .</li> -</ul> - -<p>The SHA1SUM of this image is: 702d1718548f401c74bfa6df9f032cc3ee16597e</p> - -<p>The Source DVD image has the filename -debian-edu-7.1+edu0~b2-source-DVD.iso and the SHA1SUM -089eed8b3f962db47aae1f6a9685e9bb2fa30ca5 and is available the same way -as the other isos.</p> - -<p>How to report bugs</p> - -<p>For information how to report bugs please see -<br><a href="http://wiki.debian.org/DebianEdu/HowTo/ReportBugs">http://wiki.debian.org/DebianEdu/HowTo/ReportBugs</a></p> - - -<p>About Debian Edu and Skolelinux</p> - -<p>Debian Edu, also known as Skolelinux, is a Linux distribution based -on Debian providing an out-of-the box environment of a completely -configured school network. Immediately after installation a school -server running all services needed for a school network is set up just -waiting for users and machines being added via GOsa², a comfortable -Web-UI. A netbooting environment is prepared using PXE, so after -initial installation of the main server from CD or USB stick all other -machines can be installed via the network. The provided school server -provides LDAP database and Kerberos authentication service, -centralized home directories, DHCP server, web proxy and many other -services. The desktop contains more than 60 educational software -packages and more are available from the Debian archive, and schools -can choose between KDE, Gnome, LXDE and Xfce desktop environment.</p> - -<p>This is the seventh test release based on Debian Wheezy. Basically -this is an updated and slightly improved version compared to the -Squeeze release.</p> - -<p>Notes for upgrades from Alpha Prereleases</p> - -<p>Alpha based installations should reinstall or downgrade the -versions of gosa and libpam-mklocaluser to the ones used in this beta -release. Both alpha and beta0 based installations should reinstall or -deal with gosa.conf manually; there are two options: (1) Keep -gosa.conf and edit this file as outlined on the mailing list. (2) -Accept the new version of gosa.conf and replace both contained admin -password placeholders with the password hashes found in the old one -(backup copy!). In both cases all users need to change their password -to make sure a password is set for CIFS access to their home -directory.</p> - - -<p>cheers, -<br> Holger</p> -</blockquote> + How to add extra storage servers in Debian Edu / Skolelinux + http://people.skolelinux.org/pere/blog/How_to_add_extra_storage_servers_in_Debian_Edu___Skolelinux.html + http://people.skolelinux.org/pere/blog/How_to_add_extra_storage_servers_in_Debian_Edu___Skolelinux.html + Wed, 12 Mar 2014 12:50:00 +0100 + <p>On larger sites, it is useful to use a dedicated storage server for +storing user home directories and data. The design for handling this +in <a href="http://www.skolelinux.org/">Debian Edu / Skolelinux</a>, is +to update the automount rules in LDAP and let the automount daemon on +the clients take care of the rest. I was reminded about the need to +document this better when one of the customers of +<a href="http://www.slxdrift.no/">Skolelinux Drift AS</a>, where I am +on the board of directors, asked about how to do this. The steps to +get this working are the following:</p> + +<p><ol> + +<li>Add new storage server in DNS. I use nas-server.intern as the +example host here.</li> + +<li>Add automoun LDAP information about this server in LDAP, to allow +all clients to automatically mount it on reqeust.</li> + +<li>Add the relevant entries in tjener.intern:/etc/fstab, because +tjener.intern do not use automount to avoid mounting loops.</li> + +</ol></p> + +<p>DNS entries are added in GOsa², and not described here. Follow the +<a href="https://wiki.debian.org/DebianEdu/Documentation/Wheezy/GettingStarted">instructions +in the manual</a> (Machine Management with GOsa² in section Getting +started).</p> + +<p>Ensure that the NFS export points on the server are exported to the +relevant subnets or machines:</p> + +<p><blockquote><pre> +root@tjener:~# showmount -e nas-server +Export list for nas-server: +/storage 10.0.0.0/8 +root@tjener:~# +</pre></blockquote></p> + +<p>Here everything on the backbone network is granted access to the +/storage export. With NFSv3 it is slightly better to limit it to +netgroup membership or single IP addresses to have some limits on the +NFS access.</p> + +<p>The next step is to update LDAP. This can not be done using GOsa², +because it lack a module for automount. Instead, use ldapvi and add +the required LDAP objects using an editor.</p> + +<p><blockquote><pre> +ldapvi --ldap-conf -ZD '(cn=admin)' -b ou=automount,dc=skole,dc=skolelinux,dc=no +</pre></blockquote></p> + +<p>When the editor show up, add the following LDAP objects at the +bottom of the document. The "/&" part in the last LDAP object is a +wild card matching everything the nas-server exports, removing the +need to list individual mount points in LDAP.</p> + +<p><blockquote><pre> +add cn=nas-server,ou=auto.skole,ou=automount,dc=skole,dc=skolelinux,dc=no +objectClass: automount +cn: nas-server +automountInformation: -fstype=autofs --timeout=60 ldap:ou=auto.nas-server,ou=automount,dc=skole,dc=skolelinux,dc=no + +add ou=auto.nas-server,ou=automount,dc=skole,dc=skolelinux,dc=no +objectClass: top +objectClass: automountMap +ou: auto.nas-server + +add cn=/,ou=auto.nas-server,ou=automount,dc=skole,dc=skolelinux,dc=no +objectClass: automount +cn: / +automountInformation: -fstype=nfs,tcp,rsize=32768,wsize=32768,rw,intr,hard,nodev,nosuid,noatime nas-server.intern:/& +</pre></blockquote></p> + +<p>The last step to remember is to mount the relevant mount points in +tjener.intern by adding them to /etc/fstab, creating the mount +directories using mkdir and running "mount -a" to mount them.</p> + +<p>When this is done, your users should be able to access the files on +the storage server directly by just visiting the +/tjener/nas-server/storage/ directory using any application on any +workstation, LTSP client or LTSP server.</p>