查看端口： netstat -tln 防火墙设置可用端口： [root@i-uktl7ctb ~]# yum install firewalld firewall-config [root@i-uktl7ctb ~]# systemctl start firewalld [root@i-uktl7ctb ~]# firewall-cmd –permanent –zone=public –add-port=8888/tcp [root@i-u