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supervise-daemon: add health checks

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Health checks are a way to monitor a service and make sure it stays
healthy.

If a service is not healthy, it will be automatically restarted after
running the unhealthy() function to clean up.
This commit is contained in:
William Hubbs
2018-10-09 17:49:02 -05:00
parent 7a75bfb00c
commit c1e582586d
6 changed files with 169 additions and 32 deletions
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9
man/supervise-daemon.8
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@@ -16,6 +16,10 @@
.Nd starts a daemon and restarts it if it crashes
.Sh SYNOPSIS
.Nm
.Fl a , -healthcheck-timer
.Ar seconds
.Fl A , -healthcheck-delay
.Ar seconds
.Fl D , -respawn-delay
.Ar seconds
.Fl d , -chdir
@@ -90,6 +94,11 @@ Print the action(s) that are taken just before doing them.
.Pp
The options are as follows:
.Bl -tag -width indent
.Fl a , -healthcheck-timer Ar seconds
Run the healthcheck() command, possibly followed by the unhealthy()
command every time this number of seconds passes.
.Fl A , -healthcheck-delay Ar seconds
Wait this long before the first health check.
.It Fl D , -respawn-delay Ar seconds
wait this number of seconds before restarting a daemon after it crashes.
The default is 0.