Docker安装centos7报Unit firewalld.service could not be found.异常
1.下载安装firewall-cmdyum install firewalld systemd -y2.查看服务器上是否安装了firewallsystemctl status firewalld3.开启防火墙systemctl start firewalld.service4.关闭防火墙systemctl stop firewalld.service5.设置开机启动systemctl enable firewalld.service6.设置关闭开机启动systemctl di
