备份

# mysqldump -uroot -p dbname > /var/www/db.sql

停止服务

# systemctl stop mariadb

开始卸载

查看相关包

# rpm -aq|grep mariadb
mariadb-libs-5.5.65-1.el7.x86_64
mariadb-5.5.65-1.el7.x86_64
mariadb-server-5.5.65-1.el7.x86_64

移除相关包

# yum -y remove mariadb*
Loaded plugins: fastestmirror, langpacks
Repository epel is listed more than once in the configuration
Resolving Dependencies
–> Running transaction check
—> Package mariadb.x86_64 1:5.5.65-1.el7 will be erased
—> Package mariadb-libs.x86_64 1:5.5.65-1.el7 will be erased

安装

最新版本包源

# vim /etc/yum.repos.d/MariaDB.repo

输入内容

[mariadb]
name = MariaDB
baseurl = http://mirrors.aliyun.com/mariadb/yum/10.4/centos7-amd64/
gpgkey = http://mirrors.aliyun.com/mariadb/yum/RPM-GPG-KEY-MariaDB
gpgcheck = 1

清理yum并重新加载yum

# yum clean all
# yum makecache

安装MariaDB

# yum install MariaDB-server MariaDB-client -y

设置开机启动服务 启动服务

# systemctl enable mariadb
# systemctl start mariadb

还原数据库

进入数据库

# mysql -uroot -p

查看版本

MariaDB [(none)]> select version();
+—————–+
| version() |
+—————–+
| 10.4.12-MariaDB |
+—————–+

创建数据库和用户

MariaDB [(none)] use mysql;
MariaDB [mysql] create database dbname;
MariaDB [mysql] create user ‘username’@’%’ identified by ‘pwd’;

dbname为数据库名，username为用户名，pwd为密码
如果本地访问，%换为localhost

MariaDB [mysql] create user ‘username’@’localhost’ identified by ‘pwd’;

给用户授权

MariaDB [mysql] grant ALL on dbname.* to ‘username’@’%’;

导入数据库

MariaDB [mysql] use dbname;
MariaDB [dbname] source /var/www/db.sql;