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Show the dependencies of a systemd unit

harmlesssystemddebian, ubuntu
Adjust the values, the command updates live
user@server
systemctl list-dependencies apache2 --no-pager

Prints all units pulled in via Requires= or Wants= as a tree with status symbols. This shows whether a service fails to start because of a missing dependency. With --reverse, it shows the opposite: which units need this service.

Also searched as

  • which services does this service need
  • show systemd dependencies
  • what starts with this service
  • service start order

Related one-liners

All in systemd

Change service settings with an override

#systemctl edit mariadb
cautionsystemd

Enable a service and start it immediately

#systemctl enable --now fail2ban
cautionsystemd

List all running systemd services

$systemctl list-units --type=service --state=running --no-pager
harmlesssystemd

List all services enabled at boot

$systemctl list-unit-files --type=service --state=enabled --no-pager
harmlesssystemd

Query uptime, memory and restart count of a service

$systemctl show php8.2-fpm -p ActiveState,ActiveEnterTimestamp,MainPID,MemoryCurrent,NRestarts
harmlesssystemd

Restart a service and check the result

#systemctl restart php8.2-fpm && systemctl is-active php8.2-fpm
cautionsystemd

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