下面一些端口与服务都是大家经常能够在centos7用到的，如果缺乏环境的话可以去3A服务器看看！
Linux 常见端口 FTP 21 SSH 22 Telnet 23 http/ngix 80 HTTPS 443 SQL Server 1433 SQL Server 1434 Oracle 1521 MySQL 3306
Linux 常见服务启动 sshd服务 systemctl restart sshd network服务 systemctl restart network mysql服务 systemctl restart mysql 或者 systemctl restart mariadb ftp服务 systemctl restart vsftpd tomcat服务 systemctl restart tomcat http服务 systemctl restart httpd nginx服务 systemctl restart nginx