linux环境彻底删除mysql步骤

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1，使用命令查看mysql的安装情况

rpm -qa | grep mysql

结果：

[root@iZwz947of4lcxm9pai1f8vZ ~]# rpm -qa | grep mysql
mysql-community-common-5.7.24-1.el7.x86_64
mysql-community-libs-5.7.24-1.el7.x86_64
mysql-community-client-5.7.24-1.el7.x86_64
mysql57-community-release-el7-9.noarch
mysql-community-server-5.7.24-1.el7.x86_64

2，停止mysql服务，删除所安装的mysql服务

rpm -e --nodeps mysql服务名称(上面命令查询的服务)，如：
rpm -e --nodeps mysql-community-common-5.7.24-1.el7.x86_64
rpm -e --nodeps mysql-community-libs-5.7.24-1.el7.x86_64
rpm -e --nodeps mysql-community-client-5.7.24-1.el7.x86_64
rpm -e --nodeps mysql57-community-release-el7-9.noarch
rpm -e --nodeps mysql-community-server-5.7.24-1.el7.x86_64

3，查找mysql的目录和库文件，并删除

[root@iZwz947of4lcxm9pai1f8vZ ~]# find / -name mysql 
/var/lib/mysql
/var/lib/mysql/mysql
/etc/logrotate.d/mysql
/usr/lib64/mysql
/usr/share/mysql
/usr/bin/mysql

删除对应的mysql目录

rm -rf /var/lib/mysql
rm -rf /var/lib/mysql/mysql
rm -rf /etc/logrotate.d/mysql
rm -rf /usr/lib64/mysql
rm -rf /usr/share/mysql
rm -rf /usr/bin/mysql

注意：卸载后/etc/my.cnf不会删除，需要进行手工删除

rm -rf /etc/my.cnf 

4，再次查询mysql的安装情况

rpm -qa | grep mysql

无结果，说明已经卸载干净，接下来直接安装mysql就可以了