CentOS 7 64位下MySQL5.7卸载改成MySQL5.6版本(YUM)

1： 检查是否安装了MySQL组件。

[root@DB-Server init.d]# rpm -qa | grep -i mysql

mysql-community-client-5.7.19-1.el7.x86_64mysql-community-common-5.7.19-1.el7.x86_64mysql-community-libs-compat-5.7.19-1.el7.x86_64mysql-community-libs-5.7.19-1.el7.x86_64qt-mysql-4.8.5-13.el7.x86_64mysql57-community-release-el7-11.noarchmysql-community-server-5.7.19-1.el7.x86_64perl-DBD-MySQL-4.023-5.el7.x86_64

2： 卸载前关闭MySQL服务

systemctl stop mysqld

yum -y remove mysql-community-client-5.7.19-1.el7.x86_64
yum -y remove mysql-community-common-5.7.19-1.el7.x86_64
yum -y remove mysql-community-libs-compat-5.7.19-1.el7.x86_64
yum -y remove mysql57-community-release-el7-11.noarch
yum -y remove mysql-community-server-5.7.19-1.el7.x86_64

3：删除MySQL对应的文件夹

检查各个MySQL文件夹是否清理删除干净。

[root@DB-Server init.d]# whereis mysql

mysql:

[root@DB-Server init.d]# find / -name mysql

/var/lib/mysql

/var/lib/mysql/mysql

/usr/lib64/mysql

[root@DB-Server init.d]# rm -rf /var/lib/mysql

[root@DB-Server init.d]# rm -rf /var/lib/mysql/mysql

[root@DB-Server init.d]# rm -rf /usr/lib64/mysql

4：确认MySQL是否卸载删除

[root@DB-Server init.d]# rpm -qa | grep -i mysql

5：重新安装MySQL5.6版本，主要参考 （略写，主要参考以下链接）

http://blog.csdn.net/huhuhuemail/article/details/77498891

shell> wget https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpmshell> yum mysql57-community-release-el7-11.noarch.rpm 这步如果报错：已加载插件：fastestmirror, langpacks没有该命令：mysql57-community-release-el7-11.noarch.rpm。请使用 /usr/bin/yum --help改用以下命令：yum localinstall mysql57-community-release-el7-11.noarch.rpm  shell> yum repolist enabled | grep "mysql.*-community.*"shell> yum install mysql-community-server修改mysql配置文件启动MySQL服务