0 downtime. Do not set the system default run level to 0, otherwise the system will not start properly.
1 single user mode. It is used by the root user to maintain the system and other users are not allowed to use the host.
2 multi-user mode. You cannot use NFS in this mode.
3 full multi-user mode. When the host is used as a server, it is usually at this run level.
4 is not assigned for use.
5 multi-user mode for graphical login.
6 Restart.
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