mysqlctl is a command-line client used for managing mysqld instances. It is responsible for bootstrapping tasks such as generating a configuration file for mysqld and initializing the instance and its data directory.
The mysqld_safe watchdog is utilized when present. This helps ensure that mysqld is automatically restarted after failures.
Regenerate new configuration files for an existing mysqld instance (generating new server_id and server_uuid values). This could be helpful to revert configuration changes, or to pick up changes made to the bundled config in newer Vitess versions. For example: