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一、查看有没有安装Mysql

1、yum 安装方式查看有没有安装的Mysql

yum list installed mysql*

示例：

[root@host-101 ~]# yum list installed mysql*已加载插件：fastestmirror, langpacks
Loading mirror speeds from cached hostfile* base: mirrors.aliyun.com* extras: mirrors.aliyun.com* updates: mirrors.aliyun.com
已安装的软件包
mysql-community-client.x86_64                            5.7.21-1.el7                            installed
mysql-community-common.x86_64                            5.7.21-1.el7                            installed
mysql-community-libs.x86_64                              5.7.21-1.el7                            installed
mysql-community-server.x86_64                            5.7.21-1.el7                            installed

删除已经安装的软件包

yum remove mysql-community-client.x86_64  mysql-community-common.x86_64 mysql-community-libs.x86_64   mysql-community-server.x86_64

2、rpm 方式查看有没有安装的Mysql：

rpm -qa | grep -i mysql

示例：

[root@host-101 ~]# rpm -qa | grep -i mysqlmysql-community-libs-5.7.21-1.el7.x86_64
mysql-community-client-5.7.21-1.el7.x86_64
mysql-community-server-5.7.21-1.el7.x86_64
mysql-community-common-5.7.21-1.el7.x86_64

要按照顺序删除：

rpm -e mysql-community-server-5.7.21-1.el7.x86_64
rpm -e mysql-community-client-5.7.21-1.el7.x86_64
rpm -e mysql-community-libs-5.7.21-1.el7.x86_64
rpm -e mysql-community-common-5.7.21-1.el7.x86_64

要按照顺序删除，不然会报错：依赖检测失败：


[root@host-101 ~]# rpm -e mysql-community-libs-5.7.21-1.el7.x86_64错误：依赖检测失败：mysql-community-libs(x86-64) >= 5.7.9 被 (已安裝) mysql-community-client-5.7.21-1.el7.x86_64 需要[root@host-101 ~]# rpm -e mysql-community-client-5.7.21-1.el7.x86_64错误：依赖检测失败：mysql-community-client(x86-64) >= 5.7.9 被 (已安裝) mysql-community-server-5.7.21-1.el7.x86_64 需要

删除完之后，再检查一下（有的话，继续删除）：

rpm -qa | grep -i mysql

二、删除残留的mysql目录或文件：

1、查询mysql的安装目录

whereis mysql

示例：

[root@host-101 ~]# whereis mysqlmysql: /usr/local/mysql /usr/share/mysql /java/mysql5.7/bin/mysql

删除上面的文件夹

rm -rf /usr/local/mysql
rm -rf /usr/share/mysql
rm -rf /java/mysql5.7/bin/mysql

2、根据mysql的名称继续查找残留的文件，并删除：

find / -name mysqlfind / -name mysqld

示例：

mysql:[root@host-101 ~]# find / -name mysql/run/lock/subsys/mysql
/etc/selinux/targeted/active/modules/100/mysql
/etc/selinux/targeted/tmp/modules/100/mysql
/var/lib/mysql
/var/lib/mysql/mysql
/java/mysql5.7/include/mysql
/java/mysql5.7/data/mysql

删除上面的文件

rm -rf /run/lock/subsys/mysql
rm -rf /etc/selinux/targeted/active/modules/100/mysql
rm -rf /etc/selinux/targeted/tmp/modules/100/mysql
rm -rf /var/lib/mysql
rm -rf /var/lib/mysql/mysql
rm -rf /java/mysql5.7/include/mysql
rm -rf /java/mysql5.7/data/mysqlrm -rf /java/mysql5.7/bin/mysqld

3、删除mysql 配置文件

rm -rf /etc/my.cnf

4、删除 /var/log/mysqld.log

（如果不删除这个文件，会导致新安装的 mysql 无法生存新密码，导致无法登陆）

rm -rf /var/log/mysqld.logrm -rf /var/log/mysql.log

5、删除mysql开机自启动服务

服务名有可能是mysql或者mysqld，具体删除根据查询出来的结果

chkconfig --list | grep -i mysqlchkconfig --del mysqld

6、删除/etc/init.d的文件

rm -rf /etc/init.d/mysqld

示例：

[root@host-101 system]# cd /etc/init.d
[root@host-101 init.d]# ll | grep mysql
-rwxr-xr-x. 1 root root 10576 12月 29 16:38 mysqld
[root@host-101 init.d]# rm -rf mysqld

7、删除/usr/lib/systemd/system的服务

cd /usr/lib/systemd/system#查询
ll | grep mysql#删除
rm -rf mysqld.service
rm -rf mysqld@.service

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