CentOS modifies the default running level and disables Linux

Modify the default running level of CentOS, disable Linux [1], and modify the default running level. By default, only the command line interface is enabled, saving the following resources: Modify the default startup level in the inittab file, change from 5 to 3. (Note: Do not set the default running level to 0 or 6) the meaning of each start level of www.2cto.com is as follows: 0 is stopped, and the machine is disabled. The single-user mode is similar to the security mode in Win9x. 2-user mode, but not supported by NFS. 3. The complete multi-user mode is a standard operation level. 4 reserved. If no 5 is used, X11 is used. It enters the X Window System. 6. Restart the init 6 server. [Root @ localhost ~] # Vim/etc/inittab # inittab is only used by upstart for the default runlevel. # adding other configuration here will have no effect on your system. # System initialization is started by/etc/init/rcS. conf ## Individual runlevels are started by/etc/init/rc. conf # Ctrl-Alt-Delete is handled by/etc/init/control-alt-delete.conf # Terminal gettys are handled by/etc/init/tty. conf and/etc/init/serial. c Onf, # with configuration in/etc/sysconfig/init. # For information on how to write upstart event handlers, or how # upstart works, see init (5), init (8), and initctl (8 ). # www.2cto.com # Default runlevel. the runlevels used are: #0-halt (Do NOT set initdefault to this) #1-Single user mode #2-Multiuser, without NFS (The same as 3, if you do not have networking) #3-Full multiuser mode #4-unus Ed #5-X11 #6-reboot (Do NOT set initdefault to this) # id: 3: initdefault: [2] disable SELinux [root @ localhost ~] # Vi/etc/sysconfig/selinux www.2cto.com # This file controls the state of SELinux on the system. # SELINUX = can take one of these three values: # enforcing-SELinux security policy is enforced. # permissive-SELinux prints warnings instead of enforcing. # disabled-No SELinux policy is loaded. SELINUX = disabled # SELINUXTYPE = can take one of these two values: # targeted-Targeted processes are protected, # mls-Multi Level Security protection. SELINUXTYPE = targeted after modification, restart Linux or use the setenforce 0 command to disable SELinux in real time