MySQL - Completely uninstall MySQL under CentOS

1. Check whether MySQL is installed.

Method 1:

[root@localhost usr]# yum list installed mysql*  
Loaded plugins: fastestmirror  
Loading mirror speeds from cached hostfile  
 * base: mirrors.yun-idc.com  
 * extras: mirror.neu.edu.cn  
 * updates: mirrors.yun-idc.com  
Installed Packages  
MySQL-client.x86_64   5.6.27-1.el6    installed  
MySQL-devel.x86_64    5.6.27-1.el6    installed  
MySQL-server.x86_64   5.6.27-1.el6    installed  
[root@localhost usr]#

Method 2 (-i: case-insensitive):

[root@localhost usr]# rpm -qa | grep -i mysql  
MySQL-server-5.6.27-1.el6.x86_64  
MySQL-client-5.6.27-1.el6.x86_64  
MySQL-devel-5.6.27-1.el6.x86_64  
[root@localhost usr]#

2. Uninstall MySQL

Uninstall 1:

[root@localhost usr]# yum remove mysql mysql-server mysql-libs compat-mysql51  
[root@localhost usr]# rm -rf /var/lib/mysql  
[root@localhost usr]# rm /etc/my.cnf

If mysql-devel is installed (the same as add command for others), uninstall as:

[root@Tony_ts_tian init.d]# yum remove mysql mysql-devel mysql-server mysql-libs compat-mysql51

Note (for example):
mysql-5.5.39-1.el6.remi.x86_64
mysql-libs-5.5.39-1.el6.remi.x86_64
compat-mysql51-5.1. 54-1.el6.remi.x86_64
mysql-server-5.5.39-1.el6.remi.x86_64
Uninstall 2{Continue, choose one of 1 and 2 (here is the introduction):}:

[root@localhost mysql]# rpm -aq | grep -i mysql  
MySQL-server-5.6.27-1.el6.x86_64  
MySQL-client-5.6.27-1.el6.x86_64  
MySQL-devel-5.6.27-1.el6.x86_64  
[root@localhost mysql]# rpm -e MySQL-server-5.6.27-1.el6.x86_64  
[root@localhost mysql]# rpm -e MySQL-client-5.6.27-1.el6.x86_64  
[root@localhost mysql]# rpm -e MySQL-devel-5.6.27-1.el6.x86_64  
[root@localhost rc.d]# cd /var/lib/  
[root@localhost lib]# rm -rf mysql/

Note: Delete the MySQL database directory (key), otherwise the password will not be updated (default installation, if you customize the installation path and link path ln -s... please delete it.)

rm - rf /var/lib/mysql

Uninstall 3:

[root@localhost usr]# whereis mysql  
mysql: /usr/lib64/mysql  
[root@localhost usr]# rm -rf /usr/lib64/mysql

Note: find / -name mysql
Note: Clear all directories and files related to mysql and other configurations and settings. If there is, delete it. You must also consider not affecting other software.
rm -rf /usr/lib/mysql
rm -rf /usr/share/mysql
Uninstall 4:

[root@localhost usr]# rm –rf /usr/my.cnf  
[root@localhost usr]# rm -rf /root/.mysql_sercret

Uninstall 5 (self-starting service):

[root@localhost usr]# chkconfig --list | grep -i mysql  
[root@localhost usr]# chkconfig --del mysqld

此处删除看自己设置:mysql/mysqld

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