找不到mysql.sock这个文件 
如果在你操作安装提示创建该文件,重启服务器还是提示这个错误可以试一下 
mysql -uroot -h 127.0.0.1 -p 
应该是可以直接进入

具体处理方法 
重新创建并指定一个新的mysql.sock 
vim /etc/my.cnf 
分别添加,将原先的/tmp/mysql.sock注释(这个路径是用户安装时的路径,不一定一致) 
[mysqld]

socket = /var/lib/mysql/mysql.sock

[client]

socket = /var/lib/mysql/mysql.sock

:wq保存退出 
授权 
chmod 777 /var/lib/mysql/ 
重新启动数据库 
/etc/init.d/mysql restart 
/etc/init.d/mysqld restart

mysql -uroot -p -S /var/run/mysqld/mysqld.sock(这个是测试的语句)

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