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Centos7 端口相关操作查询已开放的端口：netstat -anp查询指定端口是否已开：firewall-cmd --query-port=3306/tcp提示 yes，表示开启；no表示未开启。查看防火墙状态：systemctl status firewalld开启防火墙：systemctl start firewalld关闭防火墙：systemctl stop firewalld开启防火墙：service firewalld start若遇到无法开启先用：s

yum install bind //安装dns服务systemctl stop firewalld //临时关闭防火墙systemctl disable firewalld //永久关闭防火墙setenforce 0 //临时关闭selinux永久关闭selinux可以使用vi命令打开/etc/sysconfig/selinux 文件将SELINUXTYPE=disable1. 编辑主配置文件vi /etc/named.conf修改为options {listen-on port 53