Systemd suspend on lan

Date

I needed an easy way to shutdown or hibernate my machine over the network. This is a method1 that use a systemd socket service.

Considering systemd services for shutdown and hibernation are respectively systemd-halt.service and systemd-suspend.service, we create for each a systemd socket unit file2:

Here is the content of systemd-halt.socket (systemd-suspend.socket is identical except the port which is 2113):

[Socket]
ListenStream=2112
TriggerLimitBurst=1
TriggerLimitIntervalSec=10min

[Install]
WantedBy=sockets.target
  • ListenStream is the port to listen.
  • TriggerLimitBurst and TriggerLimitIntervalSec specify that the socket may be activated only once every ten minutes.

This should be installed in /usr/local/lib/systemd/system and enabled :

$ systemctl enable systemd-halt.socket

This way, any connection on the port 2112 and 2113 will respectively halt and suspend the target. This can be done with a navigator.