centos7
防火墙开启自启：systemctl enable firewalld
防火墙关闭自启：systemctl disable firewalld
关闭防火墙：systemctl stop firewalld.service
开启防火墙：systemctl start firewalld.service
重启防火墙：systemctl restart firewalld.service
防火墙状态：systemctl status firewalld.service
查看端口：firewall-cmd --zone=public --list-ports
开启端口：firewall-cmd --zone=public --add-port=80/tcp --permanent
查看端口占用：netstat -anp | grep 8087
启动apache：systemctl start httpd