Andy Pieters <[email protected]> writes:
> Is there a good way to send a usr1 signal upon reload of a service
> with type=simple?
>
> I don't really want to do KILL USR1 $(pidof process) as that could
> pull other processes with similar names / instances.
Use $MAINPID as per man systemd.service:
ExecReload=
Commands to execute to trigger a configuration reload in the service. This
argument takes
multiple command lines, following the same scheme as described for
ExecStart= above. Use
of this setting is optional. Specifier and environment variable
substitution is supported
here following the same scheme as for ExecStart=.
One additional, special environment variable is set: if known, $MAINPID is
set to the
main process of the daemon, and may be used for command lines like the
following:
ExecReload=kill -HUP $MAINPID
Note however that reloading a daemon by sending a signal (as with the
example line above)
is usually not a good choice, because this is an asynchronous operation and
hence not
suitable to order reloads of multiple services against each other. It is
strongly
recommended to set ExecReload= to a command that not only triggers a
configuration reload
of the daemon, but also synchronously waits for it to complete. For
example, dbus-
broker(1) uses the following:
ExecReload=busctl call org.freedesktop.DBus \
/org/freedesktop/DBus org.freedesktop.DBus \
ReloadConfig
--
Feri.
