CentOS7防火牆操作

# 檢視firewalld狀态
systemctl status firewalld

# 啟動防火牆
systemctl start firewalld

# 關閉防火牆
systemctl stop firewalld
           

# 打開8080端口
firewall-cmd --zone=public --add-port=8080/tcp --permanent
# 3306端口
firewall-cmd --zone=public --add-port=3306/tcp --permanent
           

常見錯誤

1. 打開端口報錯：FirewallD is not running

防火牆未打開：

systemctl start firewalld