ERROR 2002 (HY000): Can‘t connect to local MySQL server through socket ‘/tmp/mysql.sock‘ (2)

前提：Mac hombrew 安装mysal

debug记录：

起因因为重启了电脑，然后登陆账号时发现mysql出现下列问题

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

分析：报错说在tmp文件下没有找到mysql.sock文件。由于连接服务器是通过socket通信，所以用mysql.server start 查看是否已经启动mysql server

如果能够直接启动成功：

Starting MySQL
. SUCCESS! 

下一步登录账号密码就成功了。

（本来电脑重启只是关闭了server，启动就好了，看网上各种文章反而越调越乱QTQ，此处省略重装过程的弯路，根据亲身测试，宁愿修bug，也别重装mysql，没个两三天卸不干净）

如果出现以下错误

ERROR! The server quit without updating PID file (/usr/local/var/mysql/Sheryl.pid).

apple@Sheryl bin % mysql.server start                       
Starting MySQL
./usr/local/Cellar/[email protected]/5.7.37/bin/mysqld_safe: line 144: /usr/local/var/mysql/Sheryl.err: Permission denied
/usr/local/Cellar/[email protected]/5.7.37/bin/mysqld_safe: line 144: /usr/local/var/mysql/Sheryl.err: Permission denied
/usr/local/Cellar/[email protected]/5.7.37/bin/mysqld_safe: line 198: /usr/local/var/mysql/Sheryl.err: Permission denied
/usr/local/Cellar/[email protected]/5.7.37/bin/mysqld_safe: line 144: /usr/local/var/mysql/Sheryl.err: Permission denied
 ERROR! The server quit without updating PID file (/usr/local/var/mysql/Sheryl.pid).

分析是因为权限不够的问题，加上sudo，可以启动成功！！！

apple@Sheryl bin % sudo mysql.server start
Starting MySQL
. SUCCESS! 
apple@Sheryl bin % sudo mysql.server status
 SUCCESS! MySQL running (7802)

mysql.server的其他命令也要加上sudo，否则会出现明明已经启动，但是却显示没有运行的问题

apple@Sheryl bin % mysql.server status
 ERROR! MySQL is not running, but PID file exists
apple@Sheryl bin % sudo mysql.server status
Password:
 SUCCESS! MySQL running (7802)

用mysql命令测试，不能连接，因为重装过，所以using password: NO,一般设置了密码都是YES

ERROR 1045 (28000): Access denied for user ‘apple’@‘localhost’ (using password: NO)

apple@Sheryl bin % mysql -u root -p
ERROR 1045 (28000): Access denied for user 'apple'@'localhost' (using password: NO)

我是通过hombrew安装的mysql，所以选择安装mysql_secure_installation插件来重新设置密码，就可以用密码登录啦.

查看tmp文件下也有mysql.sock，mysql.sock.lock文件，成功连接mysql。