systemdunitrescuetarget

systemdunitrescuetarget is a special systemd target unit that is activated when a system enters the rescue mode. It is typically used to provide a minimal environment for system administrators to perform recovery operations. When the system boots into rescue mode, systemd will attempt to start the systemdunitrescuetarget unit. This target unit usually brings up essential services like a login prompt and basic file system access, allowing a user to log in and troubleshoot problems.

The purpose of systemdunitrescuetarget is to offer a safe and controlled environment for repairing a broken system. Unlike the normal multi-user or graphical targets, the rescue target does not start all the usual services, reducing the chance of further damage during recovery. It ensures that critical system components are available while preventing potentially problematic services from running.

Administrators can manually enter rescue mode by appending the systemd.unit=rescue.target kernel command-line parameter during boot. Alternatively, if systemd detects unrecoverable errors during the boot process, it may automatically drop the system into rescue mode. Once in rescue mode, the systemdunitrescuetarget is active, and the administrator can then use standard Linux commands to diagnose and fix issues, such as mounting file systems, editing configuration files, or reinstalling packages. After the necessary repairs are completed, the system can be rebooted into its normal operating state.