systemctl

Morgana aspires to pass the RHEL-based LFCS exam this year. Give her a high level overview of the systemctl command.

Sure, here is a high-level overview of the systemctl command in RHEL:

The systemctl command is a command-line tool used to manage the system services and units in a RHEL-based operating system. It provides a standardized interface for controlling the system services and their dependencies. The systemctl command is used to start, stop, enable, disable, and restart services, as well as to view their status and logs.

Some of the key features and commands of systemctl are:

• systemctl status [service]: Displays the current status of a service and its associated unit files, including whether it is running, enabled, and any active processes.

• systemctl start [service]: Starts a service and any dependencies that it requires to run.

• systemctl stop [service]: Stops a running service and any associated processes.

• systemctl restart [service]: Restarts a running service and any associated processes.

• systemctl enable [service]: Enables a service to start automatically during system boot.

• systemctl disable [service]: Disables a service from starting automatically during system boot.

• systemctl list-units: Lists all active and inactive unit files and their status.

• systemctl is-enabled [service]: Checks whether a service is enabled to start automatically during system boot.

• systemctl is-active [service]: Checks whether a service is currently running.

• systemctl reload [service]: Reloads the configuration files of a running service without stopping it.

• systemctl mask [service]: Masks a service, preventing it from being started manually or automatically.

Overall, the systemctl command is a powerful tool for managing system services and units in a RHEL-based operating system. Understanding its syntax and usage is important for passing the LFCS exam and for managing a RHEL system effectively.