systemctl-add-requires

Add Requires dependency to a target

$ systemctl add-requires [target] [unit]

$ systemctl add-requires [target] [unit1 unit2 ...]

$ systemctl add-requires [target] [unit] --user

systemctl add-requires TARGET UNIT...

systemctl add-requires appends `Requires=` dependencies to a specified systemd target for one or more units. A `Requires=` relationship establishes a hard dependency: if any of the listed units fail to start, the target itself will also fail to activate.
This command provides a programmatic way to establish unit dependencies without manually editing unit files or creating symlinks in `.requires/` directories.

--system

Operate on system configuration (default)

Operate on user configuration

Make temporary changes until reboot

Apply globally for all user logins

Changes made without --runtime are persistent and survive reboots. Hard dependencies (Requires) can cause cascading failures if a unit cannot start. Consider using add-wants for softer dependencies where failure should not propagate.

The add-requires subcommand was added to systemctl in systemd version 217. Systemd was created by Lennart Poettering and Kay Sievers at Red Hat and has been the default init system for most major Linux distributions since 2015.

systemctl(1), systemctl-add-wants(1), systemd.unit(5)