Method of completely uninstalling mysql under CentOS

This paper records the complete uninstallation of MySQL under CentOS for your reference, the specific contents are as follows

1. Check whether MySQL is installed

Mode 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]#

Mode 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 (other 1 sample add command) is installed, uninstall as follows:

[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, 1, 2 Choose 1 (described here):}:

[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: Remove the MySQL database directory (critical), otherwise password will not be updated (default installation, if custom installation path and link path ln-s … please delete.)

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: Empty all directories, files and other configurations and settings related to mysql. If so, delete it. Other software must also be considered without influence.

rm -rf /usr/lib/mysql
rm -rf /usr/share/mysql

Uninstall 4:

[root@localhost usr]# rm  In fact, in fact, the rf /usr/my.cnf
[root@localhost usr]# rm -rf /root/.mysql_sercret 

Uninstall 5 (self-startup service):

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

Delete here to see your own settings: mysql/mysqld