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Added escenic-jstat systemd service #72

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Added escenic-jstat systemd service #72

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21 changes: 21 additions & 0 deletions lib/systemd/system/escenic-jstat@.service
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Original file line number Diff line number Diff line change
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[Unit]
Description=Jstat process for %i

[Service]

# 1. Check if the pidfile is a valid pid file, if not, do nothing.
# 2. redirect output to a log-file (exec 2>&1), truncate it.
# 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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@skybert skybert Jan 25, 2019 •
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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?


# This service quits when the process being monitored dies, and then
# it is respawned continuously until the pidfile lists a pid that can
# be monitored again.
Restart=always
RestartSec=12

[Install]
WantedBy=multi-user.target