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https://issues.jenkins-ci.org/browse/JENKINS-8801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=159491#comment-159491
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Edward Rudd commented on JENKINS-8801:
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I rechecked the latest jenkins release and it seems that a "restart" when
updating plugins doesn't actually do a full restart (e.g. respawning the java
process) so the PID remains the same after "restarting" when loading
new/updated plugins.
Whether there are other "Cases" where a restart does cause a re-spawn (and new
pid) I am unsure of. IF that can be confirmed that a restart never introduces
a new pid, then this can be resolved.
> When using the init scripts in the Redhat RPM package, the PID file is not
> updated when restarted from web interface
> --------------------------------------------------------------------------------------------------------------------
>
> Key: JENKINS-8801
> URL: https://issues.jenkins-ci.org/browse/JENKINS-8801
> Project: Jenkins
> Issue Type: Bug
> Components: core
> Affects Versions: current
> Environment: CentOS 5 x86, OpenJDK
> Reporter: Edward Rudd
>
> The init script stored the PID of the java process start in
> /var/run/jenkins.pid. This is used when the init script stops or restarts
> the jenkins proces. It is also used when rotating log files via the
> logrotate script.
> However, if I install a plugin, or update a plugin and restart jenkins from
> the web interface the PID is incorrect (it's the PID when jenkins first
> started, NOT after it was restarted via the web interface). This causes the
> log rotation script to not work and the init scripts to not shut down/restart
> jenkins.
> The logrotation is what really brought this to my attention as the logs were
> rotated, but since the PID was incorrect jenkins was not sent the SIGALARM so
> that it would reopen the log files.. And as such kept logging to the now
> deleted log file and consequently filled up that partition.
> Ideally jenkins should manage the PID itself, and just have an extra argument
> passed on startup.. i.e. --pidfile /var/run/jenkins.pid
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