mysql start server ip_mysql8.0.18 修改端口报错 Can't start server: Bind on TCP/IP port: Permission denied...

环境为centos7.7 + mysql 8.0.18

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示例：

1、编辑配置文件my.cnf

vi /etc/my.cnf

增加内容：port=6612

2、重启mysql服务

# systemctl start mysqld.service

显示错误如下：

Job for mysqld.service failed because the control process exited with error code. See "systemctl status mysqld.service" and "journalctl -xe" for details.

3、查看日志

# tail -200f /var/log/mysqld.log

日志显示如下错误：

2020-07-23T08:00:36.544775Z 0 [Warning] [MY-010139] [Server] Changed limits: max_open_files: 10000 (requested 10010)

2020-07-23T08:00:36.544787Z 0 [Warning] [MY-010142] [Server] Changed limits: table_open_cache: 3995 (requested 4000)

2020-07-23T08:00:36.822452Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.18) starting as process 21372

2020-07-23T08:00:37.784812Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.

2020-07-23T08:00:37.786871Z 0 [ERROR] [MY-010262] [Server] Can't start server: Bind on TCP/IP port: Permission denied

2020-07-23T08:00:37.787184Z 0 [ERROR] [MY-010257] [Server] Do you already have another mysqld server running on port: 6612 ?

2020-07-23T08:00:37.787506Z 0 [ERROR] [MY-010119] [Server] Aborting

2020-07-23T08:00:38.998982Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: Shutdown complete (mysqld 8.0.18) MySQL Community Server - GPL.

4、原因：selinux防火墙未关闭

解决方案：

vi /etc/selinux/config

SELINUX=disabled

#立即关闭

setenforce 0