CentOS7 關閉防火牆

# 查看防火牆狀態
sudo systemctl status firewalld.service

# 關閉防火牆
sudo systemctl stop firewalld.service

# 再次查看防火牆狀態
sudo systemctl status firewalld.service

# 此命令將永久關閉防火牆
sudo systemctl disable firewalld.service