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
rpm -qa | grep -i mysql # 命令1
yum list install mysql* # 或命令22.使用yum remove卸载
Bash
yum remove mysql mysql-server mysql-libs compat-mysql51
yum remove mysql-community-release3.剩下卸载不了使用
Bash
rpm -e --nodeps mysql-community-libs-5.7.22-1.el7.x86_64
rpm -e –nodeps mysql57-community-release-el7-11.noarch4.删除残留的mysql的目录或文件
Bash
whereis mysql 或 find / -name mysql
#注意不要误删其他程序的mysql文件夹
rm -rf /usr/lib64/mysql
rm -rf /usr/share/mysql
rm -rf /usr/bin/mysql
rm -rf /etc/logrotate.d/mysql
rm -rf /var/lib/mysql
rm -rf /var/lib/mysql/mysql5.删除mysql配置文件
Bash
rm –rf /usr/my.cnf
rm -rf /root/.mysql_sercret6.删除mysql开机自启动服务
Bash
chkconfig --list | grep -i mysql #查看mysql的服务
chkconfig --del mysqld #服务名为你设置时候自己设置的名字
Linux yum安装MySQL5.7
一、安装配置MySQL的yum源
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检查是否有mysql57-community-dmr这个源，如上图所示。
二、yum安装MySQL5.7
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三、启动MySQL
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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 ‘root‘@‘localhost‘ (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!
原文地址：https://www.cnblogs.com/xiaowenshu/p/10283492.html