Six operating levels for Linux systems

Six operating levels for Linux systems

0 : is shutdown status

System shutdown mode, the system default operation level cannot be set to 0, otherwise it will not start normally, the machine shuts down.

Scope of Use: Password loss can be entered into a single user level recover password

1 : is a single-user state

Root permissions for system maintenance, disable Telnet, just like Safe mode login under Windows

Scope of Use: password loss can be entered into a single user level recover password

2 : Multi-user status

No NFC network support

Network File system

NFS was developed by Sun, and launched in 1984, NFS is a rpcservice (RPC service, RPC is the software for identity proof),

It allows us to achieve the sharing of files, it is designed to be used between different systems, so its communication protocol design and host and

System is irrelevant. When users want to use the remote file, they can attach the remote file system to their own file system by using "mount".

Make the remote file use the same file as the local machine.

3 : Text State

Full multi-user mode, NFS, login to control command line mode, also our focus on the mode of operation

4 :Unused

The system is not using reserved for customer use

5 : Graphical interface

Enter graphics gut mode after login, X windows system

6 : Shutdown status

The default run level cannot be set to 6, otherwise it will not start properly and the command line init 6 machine restarts

This article from "Walking Grass machine" blog, declined to reprint!

Six operating levels for Linux systems