一些Linux默认都是启用SeLinux的，在安装操作系统的时候我们可以选择开启或者关闭SeLinux，但是在安装完系统之后又如何开启与关闭呢？
在/etc/sysconf下有一个SeLinux文件，使用vi打开，更改其中的SELINUX项的值就可以了。
- SELINUX=disable 禁用SeLinux
- SELINUX=enforcing 使用SeLinux
[[email protected] sysconfig]# vim 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=enforcing # SELINUXTYPE= can take one of these two values: # targeted - Targeted processes are protected, # minimum - Modification of targeted policy. Only selected processes are protected. # mls - Multi Level Security protection. SELINUXTYPE=targeted
关闭SELinux
1.无须重起而暂时关闭SELinux
- 以root用户运行以下命令
setenforce 0
这条命令的作用是把SELinux暂时设定成Permissive模式（关于Permissive Mode在以下会有介绍）
如果要恢复运行SELinux则可以运行
setenforce 1
这条命令会把SELinux设定成Enforcing模式
2.把SELinux永久设定为Permissive模式
这里需要讲一下Permissive和Enforcing模式的区别。 SELinux有三种模式：Enforcing, Permissive and Disable.
Enforcing模式就是应用SELinux所设定的Policy, 所有违反Policy的规则(Rules)都会被SELinux拒绝
Permissive和Enforcing的区别就在于它还是会遵循SELinux的Policy,但是对于违反规则的操作只会予以记录而并不会拒绝操作
Disable 顾名思义就是完全禁用SELinux
如果要永久设定为Permissive模式，我们就要修改SELinux的配置文件 /etc/sysconfig/selinux (在RHEL5下这是一个symbolic link to /etc/selinux/conf)
# 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 - SELinux is fully disabled.
SELINUX=enforcing
# SELINUXTYPE= type of policy in use. Possible values are:
# targeted - Only targeted network daemons are protected.
# strict - Full SELinux protection.
SELINUXTYPE=targeted
修改SELINUX=permissive,然后重新启动就可以了