25.14. Creating transient cgroups using systemd-run command

The transient cgroups set limits on resources consumed by a unit (service or scope) during its runtime.

Procedure

To create a transient control group, use the systemd-run command in the following format:
```
# systemd-run --unit=<name> --slice=<name>.slice <command>
```
This command creates and starts a transient service or a scope unit and runs a custom command in such a unit.
- The --unit=<name> option gives a name to the unit. If --unit is not specified, the name is generated automatically.
- The --slice=<name>.slice option makes your service or scope unit a member of a specified slice. Replace <name>.slice with the name of an existing slice (as shown in the output of systemctl -t slice), or create a new slice by passing a unique name. By default, services and scopes are created as members of the system.slice.
- Replace <command> with the command you want to enter in the service or the scope unit.
  The following message is displayed to confirm that you created and started the service or the scope successfully:
  # Running as unit <name>.service
Optional: Keep the unit running after its processes finished to collect runtime information:
```
# systemd-run --unit=<name> --slice=<name>.slice --remain-after-exit <command>
```
The command creates and starts a transient service unit and runs a custom command in the unit. The --remain-after-exit option ensures that the service keeps running after its processes have finished.