1、查看MySQL是否安装

 方式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]#

方式2(

-i  :不区分大小写):


[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、卸载MySQL

卸载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

如果装了mysql-devel(其他一样add command),卸载为:


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

注(例如):


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


卸载2{继续,1,2选择一种(此处为介绍):}:


[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/


注:删除MySQL数据库目录(关键) ,否则password不更新(默认安装,如果自定义安装路径和链接路径ln -s ……请删除。)


   rm -rf /var/lib/mysql


卸载3:

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

注:find / -name mysql


注:清空相关mysql的所有目录以及文件和其他配置和设置等。如果有,则删除。也必须考虑其他软件不去影响。


rm -rf /usr/lib/mysql


rm -rf /usr/share/mysql


卸载4:

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

卸载5(自启服务):

[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