Ubuntu mysql:MySQL ERROR 1698 (28000) 错误

错误:MySQL ERROR 1698 (28000)
  1. 查看一下user表
     错误的起因就是在这里， root的plugin被修改成了auth_socket，
     用密码登陆的plugin应该是mysql_native_password。

    mysql> select user, plugin from mysql.user;

2.命令:
mysql> update mysql.user set authentication_string=PASSWORD('newPwd'), plugin='mysql_native_password' where user='root';
Query OK, 1 row affected, 1 warning (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 1

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

3.重启服务，问题就解决了


错误:
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2 "No such file or directory")

问题原因:

    mysql 服务停掉了,启动就可以了