我是通过Homebrew安装的Mysql8.0，最开始的时候没啥问题，重启电脑后：
> mysql -u root -p
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)
> cd /opt/homebrew/opt/mysql/bin
> sudo mysql.server restart
ERROR! MySQL server PID file could not be found!
Starting MySQL
. ERROR! The server quit without updating PID file (/opt/homebrew/var/mysql/MacBookPro.local.pid).
1.临时的解决办法：
sudo chmod -R 777 /opt/homebrew/var/mysql
2.然后再运行命令：
sudo mysql.server restart
参考链接：
mac下mysql 错误ERROR! The server quit without updating PID file
