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mac升级重启后mysql报错mySql ERROR 2002 (HY000)，PID file could not be found

Linux-Mac   2018-10-20 00:05:54

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mac 升级Mojave后mysql启动报错

报错信息如下：

-  ERROR! MySQL server PID file could not be found!
Starting MySQL
. ERROR! The server quit without updating PID file (/usr/local/var/mysql/bogon.pid).

- mySql ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

排查：

- 链接问题：

创建目录：sudo mkdir /var/mysql
创建软链接：sudo ln -s /tmp/mysql.sock /var/mysql/mysql.sock

- 权限问题：

sudo chown -R _mysql /usr/local/var/mysql

- 配置文件问题：（真正生效的部分）

mv /etc/my.cnf /etc/my.cnf.backup

And restart the MySQL server again:
mysql -u root -p

参考：https://icesquare.com/wordpress/mysql-starting-mysql-error-the-server-quit-without-updating-pid-file/

总结：

解决办法其实很简单：
将 /etc/mysql 下的 my.cnf 文件删除，再次启动MySQL服务
删除前注意备份

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