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Run `systemctl list-units -t service`
To show all active services
Run `systemctl status sshd.service`
To examine the current runtime status of a service. (In the above example the ssh service)
Run `systemctl list-units -t target --all`
To show all available targets.
Run `systemctl list-units -t target`
To show all active targets.
Run `systemctl show -p "Wants" multi-user.target`
To see which services a target pulls in. ( In the above example the multi-user.target )
Run `/usr/lib/systemd/systemd --test --system --unit=multi-user.target`
To examine what gets started when when booted into a specific target. ( In the above example the multi-user.target )
systemd boot parameters
The following boot parameters are also available to further assist with debugging boot issues.
systemd.unit= : Overrides the unit to activate on boot. This may be used to temporarily boot into a different boot unit, for example
rescue.target or emergency.target. ( Defaults to default.target. )
systemd.dump_core= : Takes a boolean argument. If true systemd dumps core when it crashes. Otherwise no core dump is created. ( Defaults to
true )
systemd.crash_shell= : Takes a boolean argument. If true systemd spawns a shell when it crashes. Otherwise no core dump is created. Defaults to false, for security reasons, as the shell is not protected by any
password authentication.