因需求將MariaDB galera cluster 版本10.0 升級為10.4 版本

思路：

1.先進行備份，預防意外

2.關閉資料庫,解除安裝原先的10.0 MariaDB

3.安裝10.4 版本的 MariaDB

4.配置配置檔案，啟動資料庫。

升級步驟：

## 關閉資料庫,解除安裝原先的10.0 MariaDB

[root@test1 ~]# service mysql stop
Shutting down MariaDB..... SUCCESS!
[root@test1 ~]# rpm -qa |grep Maria
MariaDB-client-10.0.38-1.el7.centos.x86_64
 
MariaDB-common-10.0.38-1.el7.centos.x86_64
MariaDB-Galera-server-10.0.38-1.el7.centos.x86_64
[root@test1 ~]# rpm -e Maria*
[root@test1 ~]# rpm -e galera*
[root@test1 ~]# rpm -qa |grep Maria

如果利用yum進行操作

[root@test1 ~]# yum search Maria
Loaded plugins: fastestmirror
Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast
 
Determining fastest mirrors

* base: mirrors.aliyun.com
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com
========================================================================= N/S matched: Maria =========================================================================
MariaDB-Galera-server.x86_64 : MariaDB: a very fast and robust SQL database server
 
MariaDB-Galera-test.x86_64 : MariaDB: a very fast and robust SQL database server
MariaDB-cassandra-engine.x86_64 : MariaDB: a very fast and robust SQL database server
MariaDB-client.x86_64 : MariaDB: a very fast and robust SQL database server
MariaDB-common.x86_64 : MariaDB: a very fast and robust SQL database server
MariaDB-compat.x86_64 : MariaDB: a very fast and robust SQL database server
MariaDB-connect-engine.x86_64 : MariaDB: a very fast and robust SQL database server
MariaDB-devel.x86_64 : MariaDB: a very fast and robust SQL database server
MariaDB-oqgraph-engine.x86_64 : MariaDB: a very fast and robust SQL database server
MariaDB-server.x86_64 : MariaDB: a very fast and robust SQL database server
MariaDB-shared.x86_64 : MariaDB: a very fast and robust SQL database server
MariaDB-test.x86_64 : MariaDB: a very fast and robust SQL database server
mariadb-bench.x86_64 : MariaDB benchmark scripts and data
mariadb-devel.i686 : Files for development of MariaDB/MySQL applications
mariadb-devel.x86_64 : Files for development of MariaDB/MySQL applications
mariadb-embedded.i686 : MariaDB as an embeddable library
mariadb-embedded.x86_64 : MariaDB as an embeddable library
mariadb-embedded-devel.i686 : Development files for MariaDB as an embeddable library
mariadb-embedded-devel.x86_64 : Development files for MariaDB as an embeddable library
mariadb-libs.i686 : The shared libraries required for MariaDB/MySQL clients
mariadb-libs.x86_64 : The shared libraries required for MariaDB/MySQL clients
mariadb-server.x86_64 : The MariaDB server and related files
mariadb-test.x86_64 : The test suite distributed with MariaD
mariadb.x86_64 : A community developed branch of MySQL
 Name and summary matches only, use "search all" for everything.


[root@test1 ~]# yum remove Maria*
Loaded plugins: fastestmirror
Resolving Dependencies
--> Running transaction check
---> Package MariaDB-Galera-server.x86_64 0:10.0.38-1.el7.centos will be erased
---> Package MariaDB-client.x86_64 0:10.0.38-1.el7.centos will be erased
---> Package MariaDB-common.x86_64 0:10.0.38-1.el7.centos will be erased
--> Finished Dependency Resolution

Dependencies Resolved

======================================================================================================================================================================
Package Arch Version Repository Size
======================================================================================================================================================================
Removing:
MariaDB-Galera-server x86_64 10.0.38-1.el7.centos @mariadb 145 M
MariaDB-client x86_64 10.0.38-1.el7.centos @mariadb 49 M
MariaDB-common x86_64 10.0.38-1.el7.centos @mariadb 248 k

Transaction Summary
======================================================================================================================================================================
Remove 3 Packages

Installed size: 194 M
Is this ok [y/N]: y
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
 Erasing : MariaDB-Galera-server-10.0.38-1.el7.centos.x86_64 1/3
warning: /etc/my.cnf.d/server.cnf saved as /etc/my.cnf.d/server.cnf.rpmsave
 Erasing : MariaDB-client-10.0.38-1.el7.centos.x86_64 2/3
 Erasing : MariaDB-common-10.0.38-1.el7.centos.x86_64 3/3
 Verifying : MariaDB-client-10.0.38-1.el7.centos.x86_64 1/3
 Verifying : MariaDB-common-10.0.38-1.el7.centos.x86_64 2/3
 Verifying : MariaDB-Galera-server-10.0.38-1.el7.centos.x86_64 3/3

Removed:
 MariaDB-Galera-server.x86_64 0:10.0.38-1.el7.centos MariaDB-client.x86_64 0:10.0.38-1.el7.centos MariaDB-common.x86_64 0:10.0.38-1.el7.centos

Complete!
[root@test1 ~]# yum remove galera*

## 安裝10.4 MariaDB資料庫

yum install MariaDB-Galera-server MariaDB-client galera -y

## 啟動資料庫： systemctl start mariadb

## mysql_upgrade檢查不相容的表，更新grant表；

[root@test1 data]# mysql_upgrade -uroot -p
Phase 1/7: Checking and upgrading mysql database
`````