环境
Linux version4. 15.7-1.el6.El repo.x86 _ 64 (mock build @ build 64 R6 (gcc version4.4. 720120313 (red hat4.4.4.4.4) )
例如，开放mysql的3306端口是sudo vim /etc/sysconfig/iptables加入规则- a input-ptcp-mstate-- statenew-mtcp-dport 3306-a
案例
sudo/etc/init.d/iptablesrestartiptables端口开放状态复查sudo /etc/init.d/iptables status
机箱中的3306端口与centos 6兼容