rudder-upgrade recommends to use deprecated rudder-server-root init script
If a service check fails in rudder-upgrade, it says something like:
INFO: Checking PostgreSQL service status............ FAILED PostgreSQL service verification failed after 10 tries. INFO: Checking LDAP service status... OK ERROR: The migration has failed in some steps. Check previous error messages. Please restart the failed service(s), and start the migration script again. (on a single Rudder server, try service rudder-server-root restart)
However, since #6513, "rudder-server-root" init script has been replaced with "rudder".