摘要：
CentOS7中执行service iptables start/stop会报错Failed to start iptables.service: Unit iptables.service failed to load: No such file or directory. 在CentOS 7或R 阅读全文
摘要：
先开放3306端口#开放3306 firewall-cmd --permanent --add-port=3306/tcp systemctl restart firewalld.service #查看端口是否开放 firewall-cmd --query-port=3306/tcp 查看所有开放端 阅读全文