Linux runlevel description

  

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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