systemd

unit nomenclature

After= ensures ordering
Requires= specifies hard dependency. Ensures dependency is started. If dependency dies, die to
Wants= specifies soft dependency. Ensures dependency is started.

targets

`network-online.target`

See systemd docs If systemd-networkd and NetworkManager are running in parallel, both NetworkManager-wait-online.service and systemd-networkd-wait-online.service must start so that network-online.target is reached. Most of the the time you will only use one which leads to the other one reaching a timeout, delaying the network-online.target. So just disable the other one.

timers

transient user timer:

systemd-run --user --on-active=5 --on-unit-inactive 600 /path/to/executable

* --on-active: seconds to first run * --on-unit-inactive: seconds to wait for next run after completion