1： 检查是否安装了MySQL组件。

[root@DB-Server init.d]# rpm -qa | grep -i mysql

MySQL-devel-5.6.23-1.linux_glibc2.5

MySQL-client-5.6.23-1.linux_glibc2.5

MySQL-server-5.6.23-1.linux_glibc2.5

如上所示，说明安装了MySQL 5.6.23这个版本的client、server、devel三个组件。

2： 卸载前关闭MySQL服务

2.1 方法1

[root@DB-Server init.d]# service mysql status

 MySQL running (25673)[ OK ]

[root@DB-Server init.d]# service mysql stop

 Shutting down MySQL..[ OK ]

[root@DB-Server init.d]# service mysql status

 MySQL is not running[FAILED]

2.2 方法2

[root@DB-Server init.d]# ./mysql status

 MySQL running (26215)[ OK ]

[root@DB-Server init.d]# ./mysql stop

 Shutting down MySQL..[ OK ]

[root@DB-Server init.d]# ./mysql status

 MySQL is not running[FAILED]

[root@DB-Server init.d]# 

[root@DB-Server init.d]# chkconfig --list | grep -i mysql

mysql 0:off 1:off 2:on 3:on 4:on 5:on 6:off

[root@DB-Server init.d]# 

3. 收集MySQL对应的文件夹信息

[root@DB-Server init.d]# whereis mysql

mysql: /usr/bin/mysql /usr/include/mysql /usr/share/mysql /usr/share/man/man1/mysql.1.gz

最好实用find命令查看MySQL数据库相关的文件，方便后面彻底删除MySQL。

[root@DB-Server init.d]# find / -name mysql

/etc/rc.d/init.d/mysql

/etc/logrotate.d/mysql

/var/lock/subsys/mysql

/var/lib/mysql

/var/lib/mysql/mysql

/usr/include/mysql

/usr/include/mysql/mysql

/usr/bin/mysql

/usr/share/mysql

/usr/lib64/mysql

4： 卸载删除MySQL各类组件

[root@DB-Server init.d]# 

[root@DB-Server init.d]# rpm -ev MySQL-devel-5.6.23-1.linux_glibc2.5

[root@DB-Server init.d]# rpm -ev MySQL-server-5.6.23-1.linux_glibc2.5

You have new mail in /var/spool/mail/root

[root@DB-Server init.d]# rpm -ev MySQL-client-5.6.23-1.linux_glibc2.5

[root@DB-Server init.d]#

5：删除MySQL对应的文件夹

检查各个MySQL文件夹是否清理删除干净。

[root@DB-Server init.d]# whereis mysql

mysql:

[root@DB-Server init.d]# find / -name mysql

/var/lib/mysql

/var/lib/mysql/mysql

/usr/lib64/mysql

[root@DB-Server init.d]# rm -rf /var/lib/mysql

[root@DB-Server init.d]# rm -rf /var/lib/mysql/mysql

[root@DB-Server init.d]# rm -rf /usr/lib64/mysql

[root@DB-Server init.d]# 

6：删除mysql用户及用户组

如果有必要，删除mysql用户以及mysql用户组。

[root@DB-Server ~]# more /etc/passwd | grep mysql

mysql:x:101:501::/home/mysql:/bin/bash

[root@DB-Server ~]# more /etc/shadow | grep mysql

mysql:!!:16496::::::

[root@DB-Server ~]# more /etc/group | grep mysql

mysql:x:501:

[root@DB-Server ~]# userdel mysql

[root@DB-Server ~]# groupdel mysql

groupdel: group mysql does not exist

[root@DB-Server ~]# 

7：确认MySQL是否卸载删除

[root@DB-Server init.d]# rpm -qa | grep -i mysql

二进制包/源码安装方式的MySQL卸载

如果是采用二进制包安装的MySQL，那么你用下面命令是找不到任何MySQL组件的。所以如果你不知道MySQL的安装方式，千万不要用下面命令来判别是否安装了MySQL

[root@DB-Server init.d]# rpm -qa | grep -i mysql

1： 检查MySQL服务并关闭服务进程。

首先通过进程查看是否有MySQL的服务的状态, 如下所示，MySQL服务是启动的。

[root@DB-Server init.d]# ps -ef | grep mysql

root 4752 4302 0 22:55 pts/1 00:00:00 more /etc/init.d/mysql.server

root 7176 1 0 23:23 pts/1 00:00:00 /bin/sh /usr/local/mysql/bin/mysqld_safe --datadir=/usr/local/mysql/data --pid-file=/usr/local/mysql/data/DB-Server.localdomain.pid

mysql 7269 7176 15 23:23 pts/1 00:00:01 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --plugin-dir=/usr/local/mysql/lib/plugin --user=mysql --log-error=/usr/local/mysql/data/DB-Server.localdomain.err --pid-file=/usr/local/mysql/data/DB-Server.localdomain.pid

root 7321 4302 0 23:23 pts/1 00:00:00 grep mysql

[root@DB-Server init.d]# /etc/init.d/mysql.server status

MySQL running (7269)[ OK ]

[root@DB-Server init.d]# /etc/init.d/mysql.server stop

Shutting down MySQL..[ OK ]

[root@DB-Server init.d]# /etc/init.d/mysql.server status

MySQL is not running[FAILED]

[root@DB-Server init.d]# 

2： 查找MySQL的安装目录并彻底删除

[root@DB-Server init.d]# whereis mysql

mysql: /usr/local/mysql

[root@DB-Server init.d]# find / -name mysql

/var/spool/mail/mysql

/usr/local/mysql-5.7.5-m15-linux-glibc2.5-x86_64/include/mysql

/usr/local/mysql-5.7.5-m15-linux-glibc2.5-x86_64/bin/mysql

/usr/local/mysql-5.7.5-m15-linux-glibc2.5-x86_64/data/mysql

/usr/local/mysql

[root@DB-Server init.d]# rm -rf /usr/local/mysql-5.7.5-m15-linux-glibc2.5-x86_64/

[root@DB-Server init.d]# rm -rf /usr/local/

[root@DB-Server init.d]# rm -rf /var/spool/mail/mysql

[root@DB-Server init.d]# 

3： 删除一些配置文件

配置文件一般有/etc/my.cnf 或/etc/init.d/mysql.server，视具体安装配置情况而定。

4：删除MySQL用户以及用户组

[root@DB-Server ~]# id mysql

uid=101(mysql) gid=501(mysql) groups=501(mysql) context=root:system_r:unconfined_t:SystemLow-SystemHigh

[root@DB-Server ~]# userdel mysql