centos7 更新mariadb

1. 备份数据库内容

mysqldump -uroot -p --all-databases > /opt/database-dump.sql

2. 停止mysql并清除（前提是备份好数据库内容）

systemctl stop mariadb
yum remove mariadb mariadb-server mariadb-libs

3. 添加mariadb下载源

vi /etc/yum.repos.d/mariadb.repo
  [mariadb]
 name = MariaDB
 baseurl = http://yum.mariadb.org/10.2/centos7-amd64
 gpgkey=https://yum.mariadb.org/RPM-GPG-KEY-MariaDB
 gpgcheck=1

4. 清理yum缓存

yum clean all

5. 下载

yum install MariaDB-client MariaDB-server