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To enable, for any java process that writes its pid to a pidfile in /var/run/escenic, for example 'engine1.pid': systemctl enable escenic-jstat@engine1 systemctl start escenic-jstat@engine1 Then after a few seconds, you will see in /var/log/escenic/engine1-jstat.log: 2019-01-25T12:58:25+00:00 S0 S1 E O M CCS YGC YGCT FGC FGCT GCT 10.55 0.00 41.13 27.62 97.09 94.06 4382 169.803 6 0.218 170.021 10.55 0.00 41.14 27.62 97.09 94.06 4382 169.803 6 0.218 170.021 10.55 0.00 41.14 27.62 97.09 94.06 4382 169.803 6 0.218 170.021 Whenever engine1 is restarted, this logfile will be truncated, with no rotation.
skybert
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Jan 25, 2019
| # 3. Become the user that owns the pidfile (gosu) | ||
| # 4. chain (exec) to the jstat process so that systemd can kill jstat | ||
| # jstat will quit when the process in pidfile quits | ||
| ExecStart=/bin/bash -c 'if pgrep &> /dev/null --pidfile /var/run/escenic/%i.pid; then echo found pid; exec 2>&1 > /var/log/escenic/%i-jstat.log; date --utc --iso=seconds; exec gosu $(stat -c %%U /var/run/escenic/%i.pid) jstat -gcutil $(cat /var/run/escenic/%i.pid) 1000; fi' |
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gosu isn't installed by default on Ubuntu 18.04 and Debian 9 and isn't available in the default repositories in CentOS 7.
How about using su -c?
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both su -c and sudo are resident, and don't forward signals, meaning that they introduce a (bad) layer of insulation between systemd and jstatd. It might be possible to hard-code this service as the escenic used, though, and remove the gosu completely.
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[Service]
User=escenic
Group=escenic
is not an option?
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To enable, for any java process that writes its pid to a pidfile in
/var/run/escenic, for example 'engine1.pid':
systemctl enable escenic-jstat@engine1
systemctl start escenic-jstat@engine1
Then after a few seconds, you will see in
/var/log/escenic/engine1-jstat.log:
Whenever engine1 is restarted, this logfile will be truncated, with no rotation.