From 68aa6c7a8f09fdac0757f17c2314ef2ff14bb5f3 Mon Sep 17 00:00:00 2001 From: Petter Reinholdtsen Date: Thu, 21 Feb 2008 20:45:14 +0000 Subject: [PATCH] First framework. --- .../200802-bootsequence.html | 186 ++++++++++++++++++ .../lsb-header-progress.png | Bin 0 -> 4064 bytes 2 files changed, 186 insertions(+) create mode 100644 mypapers/200802-bootsequence/200802-bootsequence.html create mode 100644 mypapers/200802-bootsequence/lsb-header-progress.png diff --git a/mypapers/200802-bootsequence/200802-bootsequence.html b/mypapers/200802-bootsequence/200802-bootsequence.html new file mode 100644 index 0000000000..8f5741091e --- /dev/null +++ b/mypapers/200802-bootsequence/200802-bootsequence.html @@ -0,0 +1,186 @@ + + + + + + + + + + +forrige foredrag + +

Reordering the Debian boot sequence for correctness and speed

+ +

Autodetecting and configuring hardware during installation and at + runtime

+ +

Petter Reinholdtsen +
pere@hungry.com +
FOSDEM 2008, 2008-02-26

+ +

Summary

+ + + +

SysV init in Debian - Booting

+ +

Note, this is the stuff going on after the initrd part is done. +The very early boot is done before hard drive partitions is mounted.

+ +

/sbin/init start, which look at /etc/inittab and decides what to + do.
The scripts in /etc/rcS.d/ is executed in sequence by + /etc/init.d/rc, with start as the argument.
Depending on the runlevel, the scripts for the given runlevel is + executed (normally the ones in /etc/rc2.d/) are executed in + sequence, first the stop scripts with stop as their + argument, next the start scripts with start as their + argument. The rc*.d/ directories contain symlinks the files in to + /etc/init.d/.
The ordering is important.
The single-user runlevel will present a login prompt after rcS.d/ + was executed. Runlevel 1 is not the single user runlevel, but it + behaves as a better single user.

+ +

SysV init in Debian - Switching runlevels

+ +

Call telinit X where X is the new runlevel, one of S, 0, + 1, 2, 3, 4, 5, 6.
init runs in sequence all stop scripts in /etc/rcX.d/ that also + has a start symlink in the previous runlevel /etc/rcY.d/, with + stop as their argument.
init then run in sequence all start scripts in /etc/rcX.d/, with + start as their argument.

+ +

Note that switching to runlevel S will not run the scripts in +/etc/rcS.d/. To get a similar effect after boot, switch to runlevel +1. It will (should) kill all services and prepare the machine for +maintenance.

+ +

SysV init in Debian - Shutting down

+ +

This is equivalent to switching to runlevel 0 (halt) or 6 (reboot), + with a minor exception. All scripts (both start and stop) are + executed with the stop argument. + +

about ordering

+ +

Script ordering is vital for this to work. And how are the scripts +ordered? + + update-rc.d numbers. + + + + +

LSB headers for insserv

+ +

"Provides" header, list the Facility/service provided by the + script. Do not list virtual facilities (like $time)
Runlevel entries (Default-Start and Default-Stop headers), list + what runlevels to activate for this script + +
Dependency entries (Required-Start, Required-Stop, Should-Start, + Should-Stop, X-Start-Before, X-Stop-After), list the + facilities/services needed by this script. It will start after + its start dependencies and stop before its stop dependencies. The + X-* entreis are reverse dependencies. Required-* are hard + dependencies (will install even if they are missing), while + Should-* and X-* are soft dependencies (only taken into account if + scripts providing them are present).

+ +

What to list as dependencies I

+ +

If your package used the default update-rc.d settings before, this +is the header for you:

+### BEGIN INIT INFO
+# Provides:          scriptname
+# Required-Start:    $remote_fs $syslog
+# Required-Stop:     $remote_fs $syslog
+# Default-Start:     2 3 4 5
+# Default-Stop:      0 1 6
+### END INIT INFO
+

+ +

$remote_fs is needed by all scripts using files in /usr/. $syslog +is needed only by scripts starting services logging to syslog.

+ + +

Status of dependency based boot

+ +

+ +

Release goal for Debian Lenny. + +

Packages with LSB header: 654 of 866 (76%) +
Unsolved BTS reports: XXX +
Packages without BTS reports: ~150 + +

Need better documentation + +

Need debian policy updates + +

+ + - status in debian + - need better doc + - fix insserv bugs + + + +

Thank you very much

+ +

Questions?

+ +

http://www.hungry.com/~pere/mypapers/200802-bootsequence/200802-bootsequence.html

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