阿里云ecs卸载mariadb时的error

今天在阿里云新建了一个测试机器centos7.6，用来安装mysql做测试，需要先卸载mariadb，遇到了以下的报错，应该很多同学都有遇到这样的错误，简单记录下卸载过程。

1. 查看机器是否安装Mariadb

[root@test data]# rpm -qa |grep  mariadb
mariadb-libs-5.5.60-1.el7_5.x86_64

2. 卸载mariadb出现如下报错

[root@test data]# rpm -e mariadb-libs-5.5.60-1.el7_5.x86_64
error: Failed dependencies:
    libmysqlclient.so.18()(64bit) is needed by (installed) postfix-2:2.10.1-7.el7.x86_64
    libmysqlclient.so.18(libmysqlclient_18)(64bit) is needed by (installed) postfix-2:2.10.1-7.el7.x86_64

还有依赖关系，先卸载这些依赖关系

3. 卸载postfix-2:2.10.1-7.el7.x86_64
   卸载postfix-2:2.10.1-7.el7.x86_64 又出现error

[root@test data]# rpm -e postfix-2:2.10.1-7.el7.x86_64
error: Failed dependencies:
    /usr/sbin/sendmail is needed by (installed) redhat-lsb-core-4.1-27.el7.centos.1.x86_64

4. 卸载postfix-2:2.10.1-7.el7.x86_64依赖

rpm -e redhat-lsb-core-4.1-27.el7.centos.1.x86_64

5. 卸载postfix-2:2.10.1-7.el7.x86_64

rpm -e postfix-2:2.10.1-7.el7.x86_64

6. 卸载rpm -e mariadb-libs-5.5.60-1.el7_5.x86_64

rpm -e  mariadb-libs-5.5.60-1.el7_5.x86_64

7. 查看mariadb是否已经卸载完成

rpm -qa |grep  mariadb