MYSQL登录错误：mysqladmin connect to server at ‘localhost’ failed，修改密码，忘记密码

[MYSQL登录错误：mysqladmin: connect to server at ‘localhost’ failed]
一、mysql登录错误

mysqladmin: connect to server at ‘localhost’ failed
error: ‘Access denied for user ‘root’@‘localhost’ (using password: YES)’

解决办法：破解mysql密码

 1 [root@localhost ~]# service mysqld stop
 2 [root@localhost ~]# mysqld_safe --skip-grant-tables &
 3 输入 mysql -uroot -p 回车进入
 4 use mysql;
 5 \> update user set password=PASSWORD("newpass")where user="root";

　　　　5.7及以上版本
　　　

 \> update mysql.user set authentication_string=password('123') where user='root';

 6 更改密码为 newpassord
 7 \> flush privileges; 更新权限
 8 
 9 \> exit 退出
10 
11 [toot@localhost ~]# service mysqld restart
12 [toot@localhost ~]# mysql -uroot -p新密码进入

二，忘记本地root的登录密码

解决过程：

1、编辑/etc/my.cnf

在[mysqld] 配置部分添加一行

skip-grant-tables

2、保存后重启mysql

[root@localhost ~]# service mysqld restart
Shutting down MySQL. [ OK ]
Starting MySQL. [ OK ]

3、登录数据库重新设置root密码

 1 [root@localhost ~]# mysql -uroot -p mysql
 2 Enter password:
 3 
 4 直接回车进入
 5 
 6 
 7 Welcome to the MySQL monitor. Commands end with ; or \g.
 8 Your MySQL connection id is 1
 9 Server version: 5.1.47-log Source distribution
10 
11 Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
12 This software comes with ABSOLUTELY NO WARRANTY. This is free software,
13 and you are welcome to modify and redistribute it under the GPL v2 license
14 
15 Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
16 
17 mysql> show databases;
18 
19 **+--------------------+
20 | Database      |
21 +--------------------+
22 | information_schema |
23 | mysql       |
24 | test        |
25 +--------------------+
26 3 rows in set (0.00 sec)
27 执行下列语句
28 mysql> update user set password=password("mysql") where user='root';5.7以前旧版本

　　mysql>update mysql.user set authentication_string=password('123') where user='root';5.7 以后新版本

29 Query OK, 4 rows affected (0.00 sec) 30 Rows matched: 4 Changed: 4 Warnings: 0 31 mysql> flush privileges; 32 Query OK, 0 rows affected (0.00 sec)

4、删除/etc/my.cnf文件中添加的"skip-grant-tables"行，重启mysql；

用新设的密码就能正常登录了；
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原文链接：https://blog.csdn.net/double_happy111/article/details/103496751