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 enable firewalld查看防火墙状态

CentOS7开启和关闭端口开启2333端口firewall-cmd –zone=public –add-port=2333/tcp –permanent更新防火墙规则使刚刚添加的2333端口生效firewall-cmd –reload查看开放的端口列表firewall-cmd –list-ports关闭2333端口firewall-cmd –zone=public –remove-port=2333/tcp –permanent更新防火墙规则使用刚刚删除的端口关闭firewall-cmd –reload