Cheat sheets#

systemd’s dependencies#

A has X=B in its [Unit] section where X is one of Wants, Requires, Requisite, BindsTo, PartOf, and Upholds.

		`A` starts	`B` fails	`B` stops / restarts
		`A` starts	`B` fails	implicitly	explicitly
`Wants`		`B` starts
`Requires`	`After`	`B` starts	`A` fails		`A` stops / restarts
`Requires`		`B` starts			`A` stops / restarts
`BindsTo`	`After`	`B` starts	`A` fails	`A` stops / restarts	`A` stops / restarts
`BindsTo`		`B` starts	`A` exits	`A` stops / restarts	`A` stops / restarts
`PartOf`				`A` stops / restarts	`A` stops / restarts
`Upholds`		`B` is kept alive

Requisite: A starts normally if B is already running, fails otherwise.