General ordering (dependencies)

Wants, Wanted By

Weakest dependency Please activate together ,but no big deal if you don’t

/lib/systemd/system/friendly-recovery.target

`Wants: friendly-recovery.service`

/lib/systemd/system/motd-news.tmier

`WantedBy: timers.target`

Requiters Required by

Strong Dependency You Must activate these units together

/lib/systemd/system/friendly-recovery.target

`Requires: baisc.target`

/lib/systemd/system/friendly-recovery.target

`RequiredBy: baisc.target`

Explicit Ordering

In what order are units started

/lib/systemd/system/friendly-recovery.target

`Before: baisc.target`

/lib/systemd/system/friendly-recovery.target

`After: baisc.target`

Others

• Requisite like Requires but must already be active
• BindsTo like Requires but more tightly coupled
• PartOf like Requires but only affects starting/stopping
• Conflicts exclude 2 units from being active simultaneously

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systemd