diff --git a/blog/FAD_lanserer_reiseregningsskjema_som_fri_programvare.html b/blog/FAD_lanserer_reiseregningsskjema_som_fri_programvare.html
index b25becad16..22f013a5d7 100644
--- a/blog/FAD_lanserer_reiseregningsskjema_som_fri_programvare.html
+++ b/blog/FAD_lanserer_reiseregningsskjema_som_fri_programvare.html
@@ -118,7 +118,7 @@ gjorde det litt vanskeligere for brukeren.
diff --git a/blog/Fiksgatami_begynner____ta_form.html b/blog/Fiksgatami_begynner____ta_form.html
index 0ab3e096d8..56b23b710d 100644
--- a/blog/Fiksgatami_begynner____ta_form.html
+++ b/blog/Fiksgatami_begynner____ta_form.html
@@ -59,7 +59,7 @@ med dem. Dette blir bra.
diff --git a/blog/Norge_trenger_en_personvernforening.html b/blog/Norge_trenger_en_personvernforening.html
index 307382a77f..9bf9d7a751 100644
--- a/blog/Norge_trenger_en_personvernforening.html
+++ b/blog/Norge_trenger_en_personvernforening.html
@@ -54,7 +54,7 @@ nå får vi se om noen er enig.
diff --git a/blog/Reprap_pakke_tapt_i_posten.html b/blog/Reprap_pakke_tapt_i_posten.html
index 96cc2df983..d471eaf563 100644
--- a/blog/Reprap_pakke_tapt_i_posten.html
+++ b/blog/Reprap_pakke_tapt_i_posten.html
@@ -50,7 +50,7 @@ lenge alt er klart til Go Open
diff --git a/blog/The_sorry_state_of_multimedia_browser_plugins_in_Debian.html b/blog/The_sorry_state_of_multimedia_browser_plugins_in_Debian.html
index 4c8c6d2d59..8bba95c1de 100644
--- a/blog/The_sorry_state_of_multimedia_browser_plugins_in_Debian.html
+++ b/blog/The_sorry_state_of_multimedia_browser_plugins_in_Debian.html
@@ -59,7 +59,7 @@ be the only one fitting our needs. :/
At work with the University of Oslo, we have several hundred computers
+in our computing center. This give us a challenge in tracking the
+location and cabling of the computers, when they are added, moved and
+removed. Some times the location register is not updated when a
+computer is inserted or moved and we then have to search the room for
+the "missing" computer.
+
+
In the last issue of Linux Journal, I came across a project
+libdmtx to write and read bar
+code blocks as defined in the
+The Data Matrix
+Standard. This is bar codes that can be read with a normal
+digital camera, for example that on a cell phone, and several such bar
+codes can be read by libdmtx from one picture. The bar code standard
+allow up to 2 KiB to be written in the tag. There is another project
+with a bar code
+writer written in postscript capable of creating such bar codes,
+but this was the first time I found a tool to read these bar
+codes.
+
+
It occurred to me that this could be used to tag and track the
+machines in our computing center. If both racks and computers are
+tagged this way, we can use a picture of the rack and all its
+computers to detect the rack location of any computer in that rack.
+If we do this regularly for the entire room, we will find all
+locations, and can detect movements and removals.
+
+
I decided to test if this would work in practice, and picked a
+random rack and tagged all the machines with their names. Next, I
+took pictures with my digital camera, and gave the dmtxread program
+these JPEG pictures to see how many tags it could read. This worked
+fairly well. If the pictures was well focused and not taken from the
+side, all tags in the image could be read. Because of limited space
+between the racks, I was unable to get a good picture of the entire
+rack, but could without problem read all tags from a picture covering
+about half the rack. I had to limit the search time used by dmtxread
+to 60000 ms to make sure it terminated in a reasonable time frame.
+
+
My conclusion is that this could work, and we should probably look
+at adjusting our computer tagging procedures to use bar codes for
+easier automatic tracking of computers.
+
+
diff --git a/blog/When_web_browser_developers_make_a_video_player___.html b/blog/When_web_browser_developers_make_a_video_player___.html
index 317610a7dd..49d8eabba6 100644
--- a/blog/When_web_browser_developers_make_a_video_player___.html
+++ b/blog/When_web_browser_developers_make_a_video_player___.html
@@ -83,7 +83,7 @@ sure hope it was using the announced Ogg Theora support. :)
diff --git a/blog/archive/2008/11/index.html b/blog/archive/2008/11/index.html
index ff45630037..be127e5e91 100644
--- a/blog/archive/2008/11/index.html
+++ b/blog/archive/2008/11/index.html
@@ -204,7 +204,7 @@ lenge alt er klart til Go Open
diff --git a/blog/archive/2009/02/02.rss b/blog/archive/2009/02/02.rss
index 5bafcddd1a..d1cf37ab14 100644
--- a/blog/archive/2009/02/02.rss
+++ b/blog/archive/2009/02/02.rss
@@ -164,5 +164,55 @@ automatisk over i spesialkartet.</p>
+
+ Using bar codes at a computing center
+ ../../../Using_bar_codes_at_a_computing_center.html
+ ../../../Using_bar_codes_at_a_computing_center.html
+ Fri, 20 Feb 2009 08:30:00 +0100
+
+<p>At work with the University of Oslo, we have several hundred computers
+in our computing center. This give us a challenge in tracking the
+location and cabling of the computers, when they are added, moved and
+removed. Some times the location register is not updated when a
+computer is inserted or moved and we then have to search the room for
+the "missing" computer.</p>
+
+<p>In the last issue of Linux Journal, I came across a project
+<a href="http://www.libdmtx.org/">libdmtx</a> to write and read bar
+code blocks as defined in the
+<a href="http://en.wikipedia.org/wiki/Data_Matrix">The Data Matrix
+Standard</a>. This is bar codes that can be read with a normal
+digital camera, for example that on a cell phone, and several such bar
+codes can be read by libdmtx from one picture. The bar code standard
+allow up to 2 KiB to be written in the tag. There is another project
+with <a href="http://www.terryburton.co.uk/barcodewriter/">a bar code
+writer written in postscript</a> capable of creating such bar codes,
+but this was the first time I found a tool to read these bar
+codes.</p>
+
+<p>It occurred to me that this could be used to tag and track the
+machines in our computing center. If both racks and computers are
+tagged this way, we can use a picture of the rack and all its
+computers to detect the rack location of any computer in that rack.
+If we do this regularly for the entire room, we will find all
+locations, and can detect movements and removals.</p>
+
+<p>I decided to test if this would work in practice, and picked a
+random rack and tagged all the machines with their names. Next, I
+took pictures with my digital camera, and gave the dmtxread program
+these JPEG pictures to see how many tags it could read. This worked
+fairly well. If the pictures was well focused and not taken from the
+side, all tags in the image could be read. Because of limited space
+between the racks, I was unable to get a good picture of the entire
+rack, but could without problem read all tags from a picture covering
+about half the rack. I had to limit the search time used by dmtxread
+to 60000 ms to make sure it terminated in a reasonable time frame.</p>
+
+<p>My conclusion is that this could work, and we should probably look
+at adjusting our computer tagging procedures to use bar codes for
+easier automatic tracking of computers.</p>
+
+
+
diff --git a/blog/archive/2009/02/index.html b/blog/archive/2009/02/index.html
index d3f8842c0e..a6d531a004 100644
--- a/blog/archive/2009/02/index.html
+++ b/blog/archive/2009/02/index.html
@@ -256,6 +256,69 @@ automatisk over i spesialkartet.
+
At work with the University of Oslo, we have several hundred computers
+in our computing center. This give us a challenge in tracking the
+location and cabling of the computers, when they are added, moved and
+removed. Some times the location register is not updated when a
+computer is inserted or moved and we then have to search the room for
+the "missing" computer.
+
+
In the last issue of Linux Journal, I came across a project
+libdmtx to write and read bar
+code blocks as defined in the
+The Data Matrix
+Standard. This is bar codes that can be read with a normal
+digital camera, for example that on a cell phone, and several such bar
+codes can be read by libdmtx from one picture. The bar code standard
+allow up to 2 KiB to be written in the tag. There is another project
+with a bar code
+writer written in postscript capable of creating such bar codes,
+but this was the first time I found a tool to read these bar
+codes.
+
+
It occurred to me that this could be used to tag and track the
+machines in our computing center. If both racks and computers are
+tagged this way, we can use a picture of the rack and all its
+computers to detect the rack location of any computer in that rack.
+If we do this regularly for the entire room, we will find all
+locations, and can detect movements and removals.
+
+
I decided to test if this would work in practice, and picked a
+random rack and tagged all the machines with their names. Next, I
+took pictures with my digital camera, and gave the dmtxread program
+these JPEG pictures to see how many tags it could read. This worked
+fairly well. If the pictures was well focused and not taken from the
+side, all tags in the image could be read. Because of limited space
+between the racks, I was unable to get a good picture of the entire
+rack, but could without problem read all tags from a picture covering
+about half the rack. I had to limit the search time used by dmtxread
+to 60000 ms to make sure it terminated in a reasonable time frame.
+
+
My conclusion is that this could work, and we should probably look
+at adjusting our computer tagging procedures to use bar codes for
+easier automatic tracking of computers.
At work with the University of Oslo, we have several hundred computers
+in our computing center. This give us a challenge in tracking the
+location and cabling of the computers, when they are added, moved and
+removed. Some times the location register is not updated when a
+computer is inserted or moved and we then have to search the room for
+the "missing" computer.
+
+
In the last issue of Linux Journal, I came across a project
+libdmtx to write and read bar
+code blocks as defined in the
+The Data Matrix
+Standard. This is bar codes that can be read with a normal
+digital camera, for example that on a cell phone, and several such bar
+codes can be read by libdmtx from one picture. The bar code standard
+allow up to 2 KiB to be written in the tag. There is another project
+with a bar code
+writer written in postscript capable of creating such bar codes,
+but this was the first time I found a tool to read these bar
+codes.
+
+
It occurred to me that this could be used to tag and track the
+machines in our computing center. If both racks and computers are
+tagged this way, we can use a picture of the rack and all its
+computers to detect the rack location of any computer in that rack.
+If we do this regularly for the entire room, we will find all
+locations, and can detect movements and removals.
+
+
I decided to test if this would work in practice, and picked a
+random rack and tagged all the machines with their names. Next, I
+took pictures with my digital camera, and gave the dmtxread program
+these JPEG pictures to see how many tags it could read. This worked
+fairly well. If the pictures was well focused and not taken from the
+side, all tags in the image could be read. Because of limited space
+between the racks, I was unable to get a good picture of the entire
+rack, but could without problem read all tags from a picture covering
+about half the rack. I had to limit the search time used by dmtxread
+to 60000 ms to make sure it terminated in a reasonable time frame.
+
+
My conclusion is that this could work, and we should probably look
+at adjusting our computer tagging procedures to use bar codes for
+easier automatic tracking of computers.
Min mormor har intet dypt forhold til opphavsrettsloven. Hun eier
-ingen kopimaskin eller datamaskin. Hun kan ikke bruke videoopptaker,
-og er generelt sjelden i en situasjon der hun kunne tenkes å kopiere
-noe som er opphavsrettslig vernet. Da jeg en gang forklarte at jeg
-var involvert i
-OpenStreetmap-prosjektet
-(hun lurte på hvorfor jeg kjørte rundt i nabolaget med GPS), var
-"hvorfor ikke bruke de offisielle kartene fra kartverket " det første
-hun spurte om. Jeg er usikker på om svaret ga mening, i og med at
-hun aldri har tenkt nøye over bruksrettigheter og slikt. Hva skulle
-hun med retten til videredistribusjon av nye kartkopier, som ikke
-kopierer kart? Hva skulle hun med retten til å publisere endrede
-utgaver som aldri har hatt behov for annet enn å notere litt på en
-kartkopi? Det er altså mulig å gå igjennom livet (og det har vært
-et langt og innholdsrikt liv for min mormor) uten å forholde seg til
-opphavsrettsloven.
-
-
Andre igjen trenger solid kunnskap om konsekvensene av paragrafene
-i opphavsrettsloven i sitt daglige virke, men har av ulike årsaker
-ikke satt seg nøye inn i lovens konsekvens. Denne teksten er tiltenkt
-slike lesere.
-
-
NÃ¥r en publiserer programvare eller annet opphavsrettsbeskyttet
-materiale (eller "verk" som loven kaller det), så er det endel ting
-som er lurt å tenke på. Hvis en ikke sier noe spesifikt om vilkårene
-for publiseringen, så er det opphavsrettens grunnregler som gjelder.
-De sier blant annet at ingen andre enn rettighetshaver kan publisere,
-kopiere og endre verket. Hvis en ønsker å publisere noe uten
-bruksbegrensninger for mottaker (f.eks. fri programvare eller fritt
-tilgjengelige data), så må en altså eksplisitt gi tillatelse for andre
-til å gjøre disse tingene. Slike eksplisitte tillatelser kalles
-gjerne lisenser. Det er en god del å tenke på når en lager lisenser,
-og det er enkelt å gjøre feil, slik at lisensen ikke uttrykker
-intensjonen med publiseringen. Det er derfor lurt å gjenbruke en
-eksisterende lisenstekst hvis det er mulig.
-
-
Av flere årsaker er det lurt å ikke finne på sin egen lisenstekst.
-For det første gir det jobb for de som ønsker å bruke verket å sette
-seg inn i, forstå og vurdere hver enkelt lisens, for å finne ut om den
-dekker bruksbehovet. Hver ny lisensvariant gir dermed ekstra arbeide
-for de organisasjoner og individer som vurderer å ta i bruk et
-opphavsrettsbeskyttet verk. Gjenbruk forutsetter gjerne bruk sammen
-med andre verk, f.eks. programmer og biblioteker skal settes sammen
-til et hele, eller datafiler skal brukes sammen med programmer. Det
-er fort gjort å lage en hjemmesnekret lisens som ikke tillater bruk
-sammen med andre komponenter hvis en ikke er påpasselig med
-utformingen av lisensen (såkalte inkompatible lisenser), spesielt hvis
-det ikke er intensjonen ved publisering. Og for det andre, så er det
-fort gjort å glemme noe når en lager lisensteksten, slik at
-rettigheter en ønsket å gi til brukerne ikke blir nevnt og lovens
-begresninger gjelder.. Første regel ved lisensvalg er derfor
-å unngå å lage sin egen, men forsøke så langt som mulig å bruke en av
-de utallige eksisterende lisensene.
Betingelser for bruk av data
- Meteorologisk institutt innehar immaterielle- og
-eiendomsrettigheter til data og produkter produsert av instituttet
-(heretter omtalt som PRODUKTER/PRODUKTENE). Selv om et utvalg
-PRODUKTER er tilgjengelige her for nedlasting og bruk, medfører ikke
-dette på noen måte overdragelse av disse rettighetene. PRODUKTENE kan
-brukes til ethvert formål som ikke er i strid med norsk lov. Dersom
-PRODUKTENE videreformidles i opprinnelig form eller i en form hvor de
-opprinnelige PRODUKTENE utgjør en vesentlig og/eller en lett
-gjenkjennelig del, skal Meteorologisk institutt oppgies som
-kilde. Dette må gjøres på en godt synlig måte. Meteorologisk institutt
-kan ikke holdes ansvarlig for eventuelle konsekvenser av bruken av
-PRODUKTENE. Meteorologisk institutt garanterer ikke regelmessighet i
-oppdateringen av PRODUKTENE, og endringer i PRODUKTENE kan forekomme
-uten varsel. For direkte leveranse av spesifisert produktsett,
-vennligst kontakt Meteorologisk institutt.
-
-
Meteorologisk institutt hevder at dette skal gjøre dem "fritt
-tilgjengelige", og det gjør at jeg mistenker at betingelsene ikke
-reflekterer intensjonen bak publiseringen. I lisensen står det ikke
-at en har rett til å endre dataene og publisere det endrede
-resultatet. Det står heller ingenting om hvorvidt en har rett til
-videredistribusjon. Mangelen på tillatelse til slik bruk gjør at jeg
-ikke ville omtale datagrunnlaget som fritt tilgjengelig. Det er i
-strid med kriteriene for Free Software
-publisert
-av FSF,
-Debian Free
-Software Guidelines og NUUGs beskrivelse av fri programvare
-publisert i
-NUUGs
-folder om dette. Jeg lurer på hvorfor Meteorologisk institutt
-ikke valgte noen kjent lisens? Skulle tro at en Creative
-Commons-lisens eller en av de mest brukte fri programvarelisensene som
-GPL og BSD kunne duge. Jeg håper Meteorologisk institutt revurderer
-og endrer på betingelsene.
diff --git a/blog/index.rss b/blog/index.rss
index 6aacbe1b31..e1f9861a6c 100644
--- a/blog/index.rss
+++ b/blog/index.rss
@@ -6,6 +6,56 @@
+
+ Using bar codes at a computing center
+ Using_bar_codes_at_a_computing_center.html
+ Using_bar_codes_at_a_computing_center.html
+ Fri, 20 Feb 2009 08:30:00 +0100
+
+<p>At work with the University of Oslo, we have several hundred computers
+in our computing center. This give us a challenge in tracking the
+location and cabling of the computers, when they are added, moved and
+removed. Some times the location register is not updated when a
+computer is inserted or moved and we then have to search the room for
+the "missing" computer.</p>
+
+<p>In the last issue of Linux Journal, I came across a project
+<a href="http://www.libdmtx.org/">libdmtx</a> to write and read bar
+code blocks as defined in the
+<a href="http://en.wikipedia.org/wiki/Data_Matrix">The Data Matrix
+Standard</a>. This is bar codes that can be read with a normal
+digital camera, for example that on a cell phone, and several such bar
+codes can be read by libdmtx from one picture. The bar code standard
+allow up to 2 KiB to be written in the tag. There is another project
+with <a href="http://www.terryburton.co.uk/barcodewriter/">a bar code
+writer written in postscript</a> capable of creating such bar codes,
+but this was the first time I found a tool to read these bar
+codes.</p>
+
+<p>It occurred to me that this could be used to tag and track the
+machines in our computing center. If both racks and computers are
+tagged this way, we can use a picture of the rack and all its
+computers to detect the rack location of any computer in that rack.
+If we do this regularly for the entire room, we will find all
+locations, and can detect movements and removals.</p>
+
+<p>I decided to test if this would work in practice, and picked a
+random rack and tagged all the machines with their names. Next, I
+took pictures with my digital camera, and gave the dmtxread program
+these JPEG pictures to see how many tags it could read. This worked
+fairly well. If the pictures was well focused and not taken from the
+side, all tags in the image could be read. Because of limited space
+between the racks, I was unable to get a good picture of the entire
+rack, but could without problem read all tags from a picture covering
+about half the rack. I had to limit the search time used by dmtxread
+to 60000 ms to make sure it terminated in a reasonable time frame.</p>
+
+<p>My conclusion is that this could work, and we should probably look
+at adjusting our computer tagging procedures to use bar codes for
+easier automatic tracking of computers.</p>
+
+
+
Kart over overvåkningskamera i Norge
Kart_over_overv__kningskamera_i_Norge.html
@@ -274,110 +324,5 @@ Kjenner kun til ufullstendige løsninger for slikt.</p>
-
- Det vanskelige Lisensvalget - ikke lag din egen
- Det_vanskelige_Lisensvalget___ikke_lag_din_egen.html
- Det_vanskelige_Lisensvalget___ikke_lag_din_egen.html
- Thu, 22 Jan 2009 22:15:00 +0100
-
-<p>Min mormor har intet dypt forhold til opphavsrettsloven. Hun eier
-ingen kopimaskin eller datamaskin. Hun kan ikke bruke videoopptaker,
-og er generelt sjelden i en situasjon der hun kunne tenkes å kopiere
-noe som er opphavsrettslig vernet. Da jeg en gang forklarte at jeg
-var involvert i
-<a href="http://www.openstreetmap.org/">OpenStreetmap-prosjektet</a>
-(hun lurte på hvorfor jeg kjørte rundt i nabolaget med GPS), var
-"hvorfor ikke bruke de offisielle kartene fra kartverket " det første
-hun spurte om. Jeg er usikker på om svaret ga mening, i og med at
-hun aldri har tenkt nøye over bruksrettigheter og slikt. Hva skulle
-hun med retten til videredistribusjon av nye kartkopier, som ikke
-kopierer kart? Hva skulle hun med retten til å publisere endrede
-utgaver som aldri har hatt behov for annet enn å notere litt på en
-kartkopi? Det er altså mulig å gå igjennom livet (og det har vært
-et langt og innholdsrikt liv for min mormor) uten å forholde seg til
-opphavsrettsloven.</p>
-
-<p>Andre igjen trenger solid kunnskap om konsekvensene av paragrafene
-i opphavsrettsloven i sitt daglige virke, men har av ulike årsaker
-ikke satt seg nøye inn i lovens konsekvens. Denne teksten er tiltenkt
-slike lesere.</p>
-
-<p>NÃ¥r en publiserer programvare eller annet opphavsrettsbeskyttet
-materiale (eller "verk" som loven kaller det), så er det endel ting
-som er lurt å tenke på. Hvis en ikke sier noe spesifikt om vilkårene
-for publiseringen, så er det opphavsrettens grunnregler som gjelder.
-De sier blant annet at ingen andre enn rettighetshaver kan publisere,
-kopiere og endre verket. Hvis en ønsker å publisere noe uten
-bruksbegrensninger for mottaker (f.eks. fri programvare eller fritt
-tilgjengelige data), så må en altså eksplisitt gi tillatelse for andre
-til å gjøre disse tingene. Slike eksplisitte tillatelser kalles
-gjerne lisenser. Det er en god del å tenke på når en lager lisenser,
-og det er enkelt å gjøre feil, slik at lisensen ikke uttrykker
-intensjonen med publiseringen. Det er derfor lurt å gjenbruke en
-eksisterende lisenstekst hvis det er mulig.</p>
-
-<p>Av flere årsaker er det lurt å ikke finne på sin egen lisenstekst.
-For det første gir det jobb for de som ønsker å bruke verket å sette
-seg inn i, forstå og vurdere hver enkelt lisens, for å finne ut om den
-dekker bruksbehovet. Hver ny lisensvariant gir dermed ekstra arbeide
-for de organisasjoner og individer som vurderer å ta i bruk et
-opphavsrettsbeskyttet verk. Gjenbruk forutsetter gjerne bruk sammen
-med andre verk, f.eks. programmer og biblioteker skal settes sammen
-til et hele, eller datafiler skal brukes sammen med programmer. Det
-er fort gjort å lage en hjemmesnekret lisens som ikke tillater bruk
-sammen med andre komponenter hvis en ikke er påpasselig med
-utformingen av lisensen (såkalte inkompatible lisenser), spesielt hvis
-det ikke er intensjonen ved publisering. Og for det andre, så er det
-fort gjort å glemme noe når en lager lisensteksten, slik at
-rettigheter en ønsket å gi til brukerne ikke blir nevnt og lovens
-begresninger gjelder.. <strong>Første regel ved lisensvalg er derfor
-å unngå å lage sin egen, men forsøke så langt som mulig å bruke en av
-de utallige eksisterende lisensene.</strong></p>
-
-<p>Et lite eksempel på problemer som kan oppstå er
-<a href="http://api.met.no/lisens.html">betingelsene som Meteorologisk
-institutt har gjort sine data tilgjengelig under</a>. De ser pr. i
-dag slik ut (kopiert hit for å sikre at framtidige lesere kjenner
-innholdet hvis de endres):</p>
-
-<blockquote><p>Betingelser for bruk av data
-<br/>Meteorologisk institutt innehar immaterielle- og
-eiendomsrettigheter til data og produkter produsert av instituttet
-(heretter omtalt som PRODUKTER/PRODUKTENE). Selv om et utvalg
-PRODUKTER er tilgjengelige her for nedlasting og bruk, medfører ikke
-dette på noen måte overdragelse av disse rettighetene. PRODUKTENE kan
-brukes til ethvert formål som ikke er i strid med norsk lov. Dersom
-PRODUKTENE videreformidles i opprinnelig form eller i en form hvor de
-opprinnelige PRODUKTENE utgjør en vesentlig og/eller en lett
-gjenkjennelig del, skal Meteorologisk institutt oppgies som
-kilde. Dette må gjøres på en godt synlig måte. Meteorologisk institutt
-kan ikke holdes ansvarlig for eventuelle konsekvenser av bruken av
-PRODUKTENE. Meteorologisk institutt garanterer ikke regelmessighet i
-oppdateringen av PRODUKTENE, og endringer i PRODUKTENE kan forekomme
-uten varsel. For direkte leveranse av spesifisert produktsett,
-vennligst kontakt Meteorologisk institutt.</p></blockquote>
-
-<p>Meteorologisk institutt hevder at dette skal gjøre dem "fritt
-tilgjengelige", og det gjør at jeg mistenker at betingelsene ikke
-reflekterer intensjonen bak publiseringen. I lisensen står det ikke
-at en har rett til å endre dataene og publisere det endrede
-resultatet. Det står heller ingenting om hvorvidt en har rett til
-videredistribusjon. Mangelen på tillatelse til slik bruk gjør at jeg
-ikke ville omtale datagrunnlaget som fritt tilgjengelig. Det er i
-strid med kriteriene for Free Software
-<a href="http://www.fsf.org/licensing/essays/free-sw.html">publisert
-av FSF</a>,
-<a href="http://www.debian.org/social_contract#guidelines">Debian Free
-Software Guidelines</a> og NUUGs beskrivelse av fri programvare
-publisert i
-<a href="http://www.nuug.no/dokumenter/folder-friprogramvare.pdf">NUUGs
-folder om dette</a>. Jeg lurer på hvorfor Meteorologisk institutt
-ikke valgte noen kjent lisens? Skulle tro at en Creative
-Commons-lisens eller en av de mest brukte fri programvarelisensene som
-GPL og BSD kunne duge. Jeg håper Meteorologisk institutt revurderer
-og endrer på betingelsene.</p>
-
-
-
diff --git a/blog/tags/3d-printer/index.html b/blog/tags/3d-printer/index.html
index cf39917afb..f662d1f800 100644
--- a/blog/tags/3d-printer/index.html
+++ b/blog/tags/3d-printer/index.html
@@ -332,7 +332,7 @@ arbeidet.
diff --git a/blog/tags/english/english.rss b/blog/tags/english/english.rss
index 8e891662e3..55b5ed9bb0 100644
--- a/blog/tags/english/english.rss
+++ b/blog/tags/english/english.rss
@@ -140,5 +140,55 @@ sure hope it was using the announced Ogg Theora support. :)</p>
+
+ Using bar codes at a computing center
+ ../../Using_bar_codes_at_a_computing_center.html
+ ../../Using_bar_codes_at_a_computing_center.html
+ Fri, 20 Feb 2009 08:30:00 +0100
+
+<p>At work with the University of Oslo, we have several hundred computers
+in our computing center. This give us a challenge in tracking the
+location and cabling of the computers, when they are added, moved and
+removed. Some times the location register is not updated when a
+computer is inserted or moved and we then have to search the room for
+the "missing" computer.</p>
+
+<p>In the last issue of Linux Journal, I came across a project
+<a href="http://www.libdmtx.org/">libdmtx</a> to write and read bar
+code blocks as defined in the
+<a href="http://en.wikipedia.org/wiki/Data_Matrix">The Data Matrix
+Standard</a>. This is bar codes that can be read with a normal
+digital camera, for example that on a cell phone, and several such bar
+codes can be read by libdmtx from one picture. The bar code standard
+allow up to 2 KiB to be written in the tag. There is another project
+with <a href="http://www.terryburton.co.uk/barcodewriter/">a bar code
+writer written in postscript</a> capable of creating such bar codes,
+but this was the first time I found a tool to read these bar
+codes.</p>
+
+<p>It occurred to me that this could be used to tag and track the
+machines in our computing center. If both racks and computers are
+tagged this way, we can use a picture of the rack and all its
+computers to detect the rack location of any computer in that rack.
+If we do this regularly for the entire room, we will find all
+locations, and can detect movements and removals.</p>
+
+<p>I decided to test if this would work in practice, and picked a
+random rack and tagged all the machines with their names. Next, I
+took pictures with my digital camera, and gave the dmtxread program
+these JPEG pictures to see how many tags it could read. This worked
+fairly well. If the pictures was well focused and not taken from the
+side, all tags in the image could be read. Because of limited space
+between the racks, I was unable to get a good picture of the entire
+rack, but could without problem read all tags from a picture covering
+about half the rack. I had to limit the search time used by dmtxread
+to 60000 ms to make sure it terminated in a reasonable time frame.</p>
+
+<p>My conclusion is that this could work, and we should probably look
+at adjusting our computer tagging procedures to use bar codes for
+easier automatic tracking of computers.</p>
+
+
+
diff --git a/blog/tags/english/index.html b/blog/tags/english/index.html
index 1834b1173f..a1186f5d35 100644
--- a/blog/tags/english/index.html
+++ b/blog/tags/english/index.html
@@ -205,6 +205,69 @@ sure hope it was using the announced Ogg Theora support. :)
At work with the University of Oslo, we have several hundred computers
+in our computing center. This give us a challenge in tracking the
+location and cabling of the computers, when they are added, moved and
+removed. Some times the location register is not updated when a
+computer is inserted or moved and we then have to search the room for
+the "missing" computer.
+
+
In the last issue of Linux Journal, I came across a project
+libdmtx to write and read bar
+code blocks as defined in the
+The Data Matrix
+Standard. This is bar codes that can be read with a normal
+digital camera, for example that on a cell phone, and several such bar
+codes can be read by libdmtx from one picture. The bar code standard
+allow up to 2 KiB to be written in the tag. There is another project
+with a bar code
+writer written in postscript capable of creating such bar codes,
+but this was the first time I found a tool to read these bar
+codes.
+
+
It occurred to me that this could be used to tag and track the
+machines in our computing center. If both racks and computers are
+tagged this way, we can use a picture of the rack and all its
+computers to detect the rack location of any computer in that rack.
+If we do this regularly for the entire room, we will find all
+locations, and can detect movements and removals.
+
+
I decided to test if this would work in practice, and picked a
+random rack and tagged all the machines with their names. Next, I
+took pictures with my digital camera, and gave the dmtxread program
+these JPEG pictures to see how many tags it could read. This worked
+fairly well. If the pictures was well focused and not taken from the
+side, all tags in the image could be read. Because of limited space
+between the racks, I was unable to get a good picture of the entire
+rack, but could without problem read all tags from a picture covering
+about half the rack. I had to limit the search time used by dmtxread
+to 60000 ms to make sure it terminated in a reasonable time frame.
+
+
My conclusion is that this could work, and we should probably look
+at adjusting our computer tagging procedures to use bar codes for
+easier automatic tracking of computers.
diff --git a/blog/tags/fiksgatami/index.html b/blog/tags/fiksgatami/index.html
index e712c96f64..46d5d16395 100644
--- a/blog/tags/fiksgatami/index.html
+++ b/blog/tags/fiksgatami/index.html
@@ -76,7 +76,7 @@ med dem. Dette blir bra.
diff --git a/blog/tags/multimedia/index.html b/blog/tags/multimedia/index.html
index 0466ad1054..cb31002246 100644
--- a/blog/tags/multimedia/index.html
+++ b/blog/tags/multimedia/index.html
@@ -140,7 +140,7 @@ sure hope it was using the announced Ogg Theora support. :)
At work with the University of Oslo, we have several hundred computers
+in our computing center. This give us a challenge in tracking the
+location and cabling of the computers, when they are added, moved and
+removed. Some times the location register is not updated when a
+computer is inserted or moved and we then have to search the room for
+the "missing" computer.
+
+
In the last issue of Linux Journal, I came across a project
+libdmtx to write and read bar
+code blocks as defined in the
+The Data Matrix
+Standard. This is bar codes that can be read with a normal
+digital camera, for example that on a cell phone, and several such bar
+codes can be read by libdmtx from one picture. The bar code standard
+allow up to 2 KiB to be written in the tag. There is another project
+with a bar code
+writer written in postscript capable of creating such bar codes,
+but this was the first time I found a tool to read these bar
+codes.
+
+
It occurred to me that this could be used to tag and track the
+machines in our computing center. If both racks and computers are
+tagged this way, we can use a picture of the rack and all its
+computers to detect the rack location of any computer in that rack.
+If we do this regularly for the entire room, we will find all
+locations, and can detect movements and removals.
+
+
I decided to test if this would work in practice, and picked a
+random rack and tagged all the machines with their names. Next, I
+took pictures with my digital camera, and gave the dmtxread program
+these JPEG pictures to see how many tags it could read. This worked
+fairly well. If the pictures was well focused and not taken from the
+side, all tags in the image could be read. Because of limited space
+between the racks, I was unable to get a good picture of the entire
+rack, but could without problem read all tags from a picture covering
+about half the rack. I had to limit the search time used by dmtxread
+to 60000 ms to make sure it terminated in a reasonable time frame.
+
+
My conclusion is that this could work, and we should probably look
+at adjusting our computer tagging procedures to use bar codes for
+easier automatic tracking of computers.
diff --git a/blog/tags/nuug/nuug.rss b/blog/tags/nuug/nuug.rss
index fe80c0c8b4..6fb4d06cc2 100644
--- a/blog/tags/nuug/nuug.rss
+++ b/blog/tags/nuug/nuug.rss
@@ -689,5 +689,55 @@ webserver og komprimert.</p>
+
+ Using bar codes at a computing center
+ ../../Using_bar_codes_at_a_computing_center.html
+ ../../Using_bar_codes_at_a_computing_center.html
+ Fri, 20 Feb 2009 08:30:00 +0100
+
+<p>At work with the University of Oslo, we have several hundred computers
+in our computing center. This give us a challenge in tracking the
+location and cabling of the computers, when they are added, moved and
+removed. Some times the location register is not updated when a
+computer is inserted or moved and we then have to search the room for
+the "missing" computer.</p>
+
+<p>In the last issue of Linux Journal, I came across a project
+<a href="http://www.libdmtx.org/">libdmtx</a> to write and read bar
+code blocks as defined in the
+<a href="http://en.wikipedia.org/wiki/Data_Matrix">The Data Matrix
+Standard</a>. This is bar codes that can be read with a normal
+digital camera, for example that on a cell phone, and several such bar
+codes can be read by libdmtx from one picture. The bar code standard
+allow up to 2 KiB to be written in the tag. There is another project
+with <a href="http://www.terryburton.co.uk/barcodewriter/">a bar code
+writer written in postscript</a> capable of creating such bar codes,
+but this was the first time I found a tool to read these bar
+codes.</p>
+
+<p>It occurred to me that this could be used to tag and track the
+machines in our computing center. If both racks and computers are
+tagged this way, we can use a picture of the rack and all its
+computers to detect the rack location of any computer in that rack.
+If we do this regularly for the entire room, we will find all
+locations, and can detect movements and removals.</p>
+
+<p>I decided to test if this would work in practice, and picked a
+random rack and tagged all the machines with their names. Next, I
+took pictures with my digital camera, and gave the dmtxread program
+these JPEG pictures to see how many tags it could read. This worked
+fairly well. If the pictures was well focused and not taken from the
+side, all tags in the image could be read. Because of limited space
+between the racks, I was unable to get a good picture of the entire
+rack, but could without problem read all tags from a picture covering
+about half the rack. I had to limit the search time used by dmtxread
+to 60000 ms to make sure it terminated in a reasonable time frame.</p>
+
+<p>My conclusion is that this could work, and we should probably look
+at adjusting our computer tagging procedures to use bar codes for
+easier automatic tracking of computers.</p>
+
+
+
diff --git a/blog/tags/personvern/index.html b/blog/tags/personvern/index.html
index c27ec6b3a6..8411c1a77d 100644
--- a/blog/tags/personvern/index.html
+++ b/blog/tags/personvern/index.html
@@ -182,7 +182,7 @@ automatisk over i spesialkartet.
diff --git a/blog/tags/web/index.html b/blog/tags/web/index.html
index f287b1c7fb..6f9e84ca6b 100644
--- a/blog/tags/web/index.html
+++ b/blog/tags/web/index.html
@@ -140,7 +140,7 @@ sure hope it was using the announced Ogg Theora support. :)