55 lines
2.5 KiB
Plaintext
55 lines
2.5 KiB
Plaintext
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After some messing about, I've finished my dependency system for runit,
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and am now using it to start up and shut down my machine. =)
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I've hacked about on svwaitup and svwaitdown a little; the diff is
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enclosed and is required to make the dependencies work. Summary of
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changes:
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* svwaitup has an option to retry (with a variable delay) if the
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supervisor is not running or the service is not requested to be up.
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This was needed as the dependencies are brought up in background
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processes for parallelism, so the parent has to wait.
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* svwaitdown has an option not to send the down command to services
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(still defaults to doing so). This is needed for the inverse situation
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of the above. =)
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You need the previous patch I posted as well which creates the tools
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svisup and svisdown.
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The actual dependency management is done by having links in
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servicedir/updeps that point to services which must be up first. The
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reverse dependencies can be automatically generated by the enclosed
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script svdepcalc, though at the moment it's really stupid and doesn't do
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any kind of checking for cycles..etc.
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Once the dependency links are there, svup and svdown will bring services
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up and down in a way which obeys all dependency rules. The way I use it:
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* All services are in a single directory; no pseudo-runlevels or
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anything
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* All services have a 'down' file to stop them starting.
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* The /etc/runit/1 script runs svup in the background on a dummy service
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which depends on everything I want to run (apache..etc).
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* runsvdir starts and brings up the supervisors, and as it does so, svup
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brings services up.
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Once the machine is up you can use svup and svdown freely to start and
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stop services in a way which follows the dependencies. Then, to shut
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down:
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* /etc/runit/3 runs 'for SRV in /service/*; do svdown $SRV; done' which
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brings services down in line with dependencies. At least, if they
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terminate properly. There is a timeout for services that don't. (they
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are not killed at this stage)
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* /etc/runit/3 runs svwaitdown -kx with a short timeout to clean up any
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services which did not get terminated cleanly by the above
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* Halt.
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I make few promises about the actual correct functioning of these
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scripts and strongly recommend that you have a good read of them (in
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fact, it'd be nice if you did that anyway to give me some feedback).
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They work for me on exactly one machine, and have been tested a bit on
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some fake services as well, but that's not a *lot* of testing.. =)
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Thanks in advance for any comments, and I hope that at least someone
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finds this useful =)
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Torne
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