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Diffstat (limited to '3 Resources/Systemd/Systemd restart signal.md')
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diff --git a/3 Resources/Systemd/Systemd restart signal.md b/3 Resources/Systemd/Systemd restart signal.md new file mode 100644 index 0000000..3497069 --- /dev/null +++ b/3 Resources/Systemd/Systemd restart signal.md @@ -0,0 +1,25 @@ +--- +tags: + - systemd + - restart +references: + - https://www.reddit.com/r/linuxquestions/comments/10eu3i0/does_systemctl_restart_send_sigterm_signal/?rdt=64556 +--- +By default, `restart` does exactly the same thing as `stop` followed by `start`. + +`stop` will: + +- execute `ExecStop=` commands, if any; + +- send the signal defined by `KillSignal=` (default: `SIGTERM`), to any remaining processes identified by the `KillMode=`; + +- send `SIGCONT` to those same processes; + +- if `SendSIGHUP=` is true (default: false), send `SIGHUP` to those same processes; + +- if `SendSIGKILL=` is true (default: true), and any processes remain after `TimeoutStopSec=`, send the `FinalKillSignal=` (default: `SIGKILL`) to those remaining processes; + +- execute `ExecStopPost=` commands, if any. + + +`restart` changes this by using `RestartKillSignal=` instead of `KillSignal=`, but if `RestartKillSignal=` is not set it just inherits its value from `KillSignal=`. And, of course, `restart` then performs all the regular `start` actions after everything else. `restart` also differs from `stop` by not flushing the file descriptor store associated with the service.
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