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 Sat 2017-04-08 10:36:57 CST; 31s ago
Main PID: 2856 (firewalld)
CGroup: /system.slice/firewalld.service
└─2856 /usr/bin/python -Es /usr/sbin/firewalld --nofork --nopid
Apr 08 10:36:56 localhost.localdomain systemd[1]: Starting firewalld - dynamic firewal....
Apr 08 10:36:57 localhost.localdomain systemd[1]: Started firewalld - dynamic firewall....
Hint: Some lines were ellipsized, use -l to show in full.
[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 1
setenforce: SELinux is disabled需要修改配置文件，然后重启linux后，才可以再打开SELinux