Linux ~ boot manager.
Article Directory
CentOS 6.x boot manager.
Run-level system.
| Run Level | meaning |
|---|---|
| 0 | Shutdown |
| 1 | Single-user mode, it is conceivable for the Windows security model, mainly for system repair. |
| 2 | Imperfect command line mode, containing NFS service. |
| 3 | Full command line mode, the character is the standard interface. |
| 4 | System reserved. |
| 5 | Graphics mode. |
| 6 | Restart. |
Run-level command.
- View run level.
init 0 -> off.
init 6 -> Restart.
[root@localhost ~]# runlevel
N 3
# 上次 现在。
- Change the operating level.
[root@localhost ~]# init 级别
- The default run level.
[root@localhost ~]# cat /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.conf,
# 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).
#
# 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 - unused
# 5 - X11
# 6 - reboot (Do NOT set initdefault to this)
#
id:3:initdefault:
System startup.
CentOS 6.x boot manager.
Boot loader ~ grub.
System modification mode.
