防火墙（firewalld）
临时关闭防火墙
systemctl stop firewalld
永久防火墙开机自关闭
systemctl disable firewalld
临时打开防火墙
systemctl start firewalld
防火墙开机启动
systemctl enable firewalld
查看防火墙状态
systemctl status firewalld
[root@localhost ~]# systemctl status firewalld
● firewalld.service- firewalld - dynamic firewall daemon
Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; vendor preset: ena bled)
Active: active (running) since Sat2017-04-0810:36:57CST; 31s ago
Main PID:2856(firewalld)
CGroup: /system.slice/firewalld.service
└─2856/usr/bin/python -Es /usr/sbin/firewalld --nofork --nopid
Apr0810:36:56localhost.localdomainsystemd[1]: Starting firewalld - dynamic firewal....
Apr0810:36:57localhost.localdomainsystemd[1]: Started firewalld - dynamic firewall....
Hint:Some lines were ellipsized, use -l to showinfull.
[root@localhost ~]#
SELinux
临时关闭SELinux
setenforce 0
临时打开SELinux
setenforce 1
查看SELinux状态
getenforce
开机关闭SELinux
编辑/etc/selinux/config文件，如下图，将SELINUX的值设置为disabled。下次开机SELinux就不会启动了。
注意，此时也不能通过setenforce 1命令临时打开。
[root@localhost~]# setenforce 1setenforce: SELinuxisdisabled
1
2
需要修改配置文件，然后重启linux后，才可以再打开SELinux
