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Essentially, here’s what we need to do:
chkconfigto register the service.
This will create symlinks to our script in
X is each runlevel we specified). One will be prefixed with
an S, indicating a startup script, and another will be prefixed with K,
for the kill or shutdown script.
The links will also be prefixed with numbers so that they can be sorted by the init system. This ensures they will start or shutdown in the proper order.
Because of common convention, LSB standards, and the nuance of the chkconfig command, any init script we write will have to meet the following requirements:
And optionally support the following actions:
# chkconfig: 345 20 70 # description: My service that rocks \ # socks
There must be a space between the hash mark and the
chkconfig: field indicates 3 space-separated values:
Note the orders are just requests, the LSB block (defined below) and other dependencies will dictate the final start/shutdown order.
description: field describes what the service is. It can
span multiple lines if you add a backslash before the carriage return, as
### BEGIN INIT INFO # Provides: myservice # Description: A service of mine that rocks socks ### END INIT INFO
Description serves the same purpose as the
chkconfig description (and they can be the same text).
Provides field lists all of the “boot facilities” that
this service provides. This is used to set dependencies.
Listing more than one can be useful if you are controlling multiple
services, or replacing the standard init scripts (so you can specify
cluster ocfs2 drbd, and any other drbd or ocfs2-dependant services
will not need to be altered).
However, it’s most likely you’ll want to also add the
Required-Stop fields as well. These
fields list “boot facilities” that your service requires during startup and
### BEGIN INIT INFO # Provides: myservice # Description: A service of mine that rocks socks # Required-Start: nfs ntpd # Required-Stop: nfs ### END INIT INFO
In this example, we’re telling
chkconfig that our service
mustn’t start before nfs and ntpd have started.
There are also
some “facilities” that are in-specific, and prefixed with a dollar sign.
which represent “the network is up” and “all local file systems are mounted”, respectively.
I’m having trouble finding concrete explanation as to why this is a requirement. All I’ve been able to find is a Red Hat “tips and tricks” entry (scroll down).
So I’m not sure if this is a hard requirement, a Red Hat requirement, or what, but it was part of Coraid’s init script shell, and I don’t see any harm, so I’ve included it here.
Some other things to keep in mind:
There is a potential for putting the init script into an egg itself. I haven’t explored this yet, but it would allow for easy inclusion of local libraries, allow you to keep the init script simple, segregate tests from the script itself, and automatically install any external resources.
The script is expected to exit after spawning the controlled application and return a relevant status code.
The LSB specs call for a “library” of sorts that contains useful functions
that help simplify init script creation. Most Linux distributions (or, at least
the ones I’m dealing with here) include a variant, installed at
At some point I’d like to emulate that entire library in python (or see if someone else already has), but there’s one bit in there that I really like, which would make these python-based init scripts look much more authentic.
When you send a command via
/sbin/service servicename, or call
the script using
/etc/init.d/servicename, most distributions print
a little colorized
[ OK ] once a
task has completed successfully (or
upon failure). I think its worth the trouble to emulate that idea.
This is accomplished with a couple of new functions, named after shell
functions I found in
/etc/init.d/functions (on a RHEL5 machine).
Google matched content
openSUSEPackaging init scripts - openSUSE
Creating a LSB standard Startup - Boot - Init Script under Ubuntu — RobPickering.com
Purely Python: LSB-Compliant Init Scripts
LSBInitScripts-DependencyBasedBoot - Debian Wiki
Unofficial SUSEFAQ - Starting and Stoping Services insserv
2.202.1 - Customising system startup and boot processes
SuSE Linux Guide for Geeks
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