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Turn off the firewall:
#立即关闭防火墙
service iptables stop
#永久关闭防火墙:下次开机才会生效
chkconfig iptables off
#查看防火墙开机启动模式
chkconfig --list iptables
Optimization SELinux:
#当前临时切换SELinux模式到Permissive
setenforce 0
#查看
getenforce
#永久切换:修改配置文件 SELINUX 属性值
vim /etc/sysconfig/selinux
SELINUX=Permissive