Systemd with multiple execStart [closed]
if Type=simple
in your unit file, you can only specify one ExecStart, but you can add as many ExecStartPre
, ExecStartPost
, but none of this is suited for long running commands, because they are executed serially and everything one start is killed before starting the next one.
If Type=oneshot
you can specify multiple ExecStart, they run serially not in parallel.
If what you want is to run multiple units in parallel, there a few things you can do:
If they differ on 1 param
You can use template units, so you create a /etc/systemd/system/foo@.service
. NOTE: (the @
is important).
[Unit]Description=script description %I[Service]Type=simpleExecStart=/script.py %iRestart=on-failure[Install]WantedBy=multi-user.target
And then you exec:
$ systemctl start foo@parameter1.service foo@parameter2.service
or...
Target dependencies
You can create multiple units that links to a single target:
#/etc/systemd/system/bar.target[Unit]Description=bar targetRequires=multi-user.targetAfter=multi-user.targetAllowIsolate=yes
And then you just modify you .service units to be WantedBy=bar.target
like:
#/etc/systemd/system/foo@.service[Unit]Description=script description %I[Service]Type=simpleExecStart=/script.py %iRestart=on-failure[Install]WantedBy=bar.target
Then you just enable the foo services you want in parallel, and start the bar target like this:
$ systemctl daemon-reload$ systemctl enable foo@param1.service$ systemctl enable foo@param2.service$ systemctl start bar.target
NOTE: that this works with any type of units not only template units.