Linux卸载yum安装的mysql

一、系统情况

Linux：Centos7.4(64位)

Mysql：5.6

二、卸载mysql

1.查看安装了哪些mysql程序

Bash

2.使用yum remove卸载

Bash

3.剩下卸载不了使用

Bash

4.删除残留的mysql的目录或文件

Bash

5.删除mysql配置文件

Bash

6.删除mysql开机自启动服务

Bash

Linux yum安装MySQL5.7

一、安装配置MySQL的yum源

检查是否有mysql57-community-dmr这个源，如上图所示。

二、yum安装MySQL5.7

三、启动MySQL

四、连接MySQL并修改密码

MySQL忘记密码，或：root密码重置报错：mysqladmin: connect to server at ‘localhost‘ failed的解决方案

MySQL root密码重置报错：mysqladmin: connect to server at ‘localhost‘ failed的解决方案

1  登陆失败,mysqladmin修改密码失败

[[email protected] var]# mysqladmin -u root password ‘123456‘

mysqladmin: connect to server at ‘localhost‘ failed

error: ‘Access denied for user [email protected] (using password: NO)‘

2 停止mysql服务

[[email protected] var]# /etc/init.d/mysqld stop

Shutting down MySQL.... SUCCESS!

3 安全模式启动

[[email protected] var]# mysqld_safe --skip-grant-tables &

(路径不一样：/opt/mysql/product/5.5.25a/bin/mysqld_safe --skip-grant-tables &)

[1] 10912

[[email protected] var]# 110407 17:39:28 mysqld_safe Logging to ‘/usr/local/mysql/var//mysql.chinascopefinanical.com.err‘.

110407 17:39:29 mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/var/

4 无密码root帐号登陆

[[email protected] var]# /usr/bin/mysql -u root -p 【注释，在下面的要求你输入密码的时候，你不用管，直接回车键一敲就过去了】

Enter password:

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 48

Server version: 5.1.41-log Source distribution

Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.

mysql> use mysql;

Database changed

5 手动update修改密码

mysql> update mysql.user set authentication_string=password("123456") where user=‘root‘ and host=‘localhost‘;

Query OK, 1 row affected (0.00 sec)

Rows matched: 1  Changed: 1  Warnings: 0

mysql> flush privileges;

Query OK, 0 rows affected (0.00 sec)

mysql> quit

Bye

[[email protected] var]# mysql -u root -p guNNhtqhjUnfky6ahyVh

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 172

Server version: 5.1.41-log Source distribution

Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.

mysql> quit

Bye

6 正常重新启动

[[email protected] var]# service mysqld restart

Shutting down MySQL..110407 17:45:29 mysqld_safe mysqld from pid file /usr/local/mysql/var//mysql.chinascopefinanical.com.pid ended

SUCCESS!

Starting MySQL.. SUCCESS!

原文：https://www.cnblogs.com/xiaowenshu/p/10283492.html