supervisorctl: add a "once" command
The proposed command would have the following semantics:
Acts on one or more processes (same semantics as "stop"), and runs the process once (regardless of the configuration). If the process is already running, wait until it exits (normally or not), but do not restart it.
The purpose is mostly for debugging and troubleshooting, in particular for a cycling process that dies shortly after start. In those cases, using "stop" is not suitable, as it interferes with the process (sends configured stop signal).
yvf
>All comments
The purpose is mostly for debugging and troubleshooting
I think it is reasonable to ask a user to set autorestart = false when debugging. That will cause supervisord to run the command once (if the command exists, supervisord will not restart it, but the start command will run it again).
If that is not sufficient for your use case, the extra command proposed here can be entirely implemented as a plugin (it would be an rpcinterface and a ctlplugin). Given the limited scope and overlap with autorestart, I would rather see it as a plugin first rather than part of the core Supervisor package.
mnaberez
on 22 Jul 2016
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Most helpful comment
I think it is reasonable to ask a user to set
autorestart = falsewhen debugging. That will causesupervisordto run the command once (if the command exists,supervisordwill not restart it, but thestartcommand will run it again).If that is not sufficient for your use case, the extra command proposed here can be entirely implemented as a plugin (it would be an
rpcinterfaceand actlplugin). Given the limited scope and overlap withautorestart, I would rather see it as a plugin first rather than part of the core Supervisor package.