CentOS修改默认运行级别，禁用SeLinux

[1] 修改默认运行级别，默认只启用命令行界面，可以节省资源

如下，修改inittab文件中的默认启动级别，由5改至3。（注意：默认运行级别不要设置为0或6）

各启动级别含义如下：

0 停机，机器关闭。
1 单用户模式，就像Win9x下的安全模式类似。
2 多用户模式，但是没有NFS支持。
3 完整的多用户模式，是标准的运行级。
4 预留，未使用
5 就是X11，进到X Window系统了。
6 为重启，运行init 6机器就会重启。

[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.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:

 

[2] 禁用SELinux

[root@localhost ~]# vi /etc/sysconfig/selinux



# 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

修改后重启Linux或使用setenforce 0命令实时禁用SELinux