System controlling

systemd provides means to control the system/user daemon itself and to control deployed units. These are (among others):

• Enabling and disabling of units (like shell command systemctl enable <unit>)
• Starting, restarting and stopping of units (like shell command systemctl restart <unit>)

Controlling is also possible through D-Bus. Therefore the manager interface provides a range of methods which can be invoked to achieve the same as if performed on the command line.

Security

Some methods require higher privileges. For example the restart of a system unit requires root privileges. When working on the command line as a non-privileged user a command like systemctl restart <unit> would be invoked by using some privilege escalation framework (like sudo or similar) along a proper set of configuration for privilege escalation. For the invokation of protected commands via D-Bus the use of polkit is required.

TODO .rules-file example