CentOS:首先查看防火墙状态：service iptables status 永久性生效，重启后不会复原开启：chkconfig iptables on关闭：chkconfig iptables off 即时生效，重启后复原开启：service iptables start关闭：service iptables stop设置后重启：reboot 临时关闭防火墙systemctl stop firewalld永久关闭防火墙的开机自启动systemctl disable firewalld临时打开防火墙systemctl start firewalld防火墙开机启动systemctl enab… 阅读全文linux centos系统开启和关闭防火墙命令