RPM 包和二进制包安装方式虽然简单，但也有一些缺陷，比如需要下载的包比较多，且包之间安装有先后依赖关系，最重要的是升级不方便。如果有新版本，则需要从新下载所有包进行替换。
为了解决这些不便之处，MySQL 官方提供了一种全新的安装方式--Yum Repository。Yum（全称为Yellow dog Updater，Modified）是一个在 Fedora 和 RedHat 以及 CentOS 中的 Shell 前段软件包管理器。基于 RPM 包管理， 能够从制定的服务器自动下载 RPM 包并且安装，可以自动处理依赖性关系，并且一次安装所有依赖的软件包，无须繁琐地一次次下载和安装。
Yum Repository 的安装包非常小，8.0 版本只有 25KB， 下载方式和其他 RPM 包类似，这里不再累述。下面详细介绍 Yum Repository 的安装和使用方法。
1、下载安装 Yum Repository
wget https://repo.mysql.com//mysql80-community-release-el7-3.noarch.rpm
[root@mgr04 ~]# rpm -ivh mysql80-community-release-el7-3.noarch.rpm
warning: mysql80-community-release-el7-3.noarch.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Preparing... ################################# [100%]
Updating / installing...
1:mysql80-community-release-el7-3 ################################# [100%]
安装完毕后，在 /etc/yum.repos.d/ 下多了 mysql-community.repo 和 mysql-community-source.repo 这两个文件，它们分别是 MySQL 社区版 RPM 包和源码包的 Yum 源文件，里面记录了支持的软件版本和下载相关的一些参数。
2、使用 Yum Repository 来安装MySQL 8.0
用 cat 命令截取 mysql-community.repo 的部分内容，如下所示：
# Enable to use MySQL 5.7
[mysql57-community]
name=MySQL 5.7 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.7-community/el/7/$basearch/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
[mysql80-community]
name=MySQL 8.0 Community Server
baseurl=http://repo.mysql.com/yum/mysql-8.0-community/el/7/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
可以看出，最新 GA 版本 8.0 的 enabled=1，其它版本均为 0。如果安装最新 GA 版本的 MySQL，则不用做任何设置， 直接执行如下命令：
[root@mgr04 ~]# yum install mysql-community-server
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com
base | 3.6 kB 00:00:00
epel | 4.7 kB 00:00:00
extras | 2.9 kB 00:00:00
mysql-connectors-community | 2.6 kB 00:00:00
mysql-tools-community | 2.6 kB 00:00:00
mysql80-community | 2.6 kB 00:00:00
updates | 2.9 kB 00:00:00
(1/5): mysql-connectors-community/x86_64/primary_db | 80 kB 00:00:05
(2/5): mysql-tools-community/x86_64/primary_db | 88 kB 00:00:05
(3/5): mysql80-community/x86_64/primary_db | 165 kB 00:00:05
(4/5): epel/x86_64/updateinfo | 1.0 MB 00:00:06
(5/5): epel/x86_64/primary_db | 6.9 MB 00:00:08
Resolving Dependencies
--> Running transaction check
---> Package mysql-community-server.x86_64 0:8.0.25-1.el7 will be installed
--> Processing Dependency: mysql-community-common(x86-64) = 8.0.25-1.el7 for package: mysql-community-server-8.0.25-1.el7.x86_64
--> Processing Dependency: mysql-community-client(x86-64) >= 8.0.11 for package: mysql-community-server-8.0.25-1.el7.x86_64
--> Running transaction check
---> Package mysql-community-client.x86_64 0:8.0.25-1.el7 will be installed
--> Processing Dependency: mysql-community-client-plugins = 8.0.25-1.el7 for package: mysql-community-client-8.0.25-1.el7.x86_64
--> Processing Dependency: mysql-community-libs(x86-64) >= 8.0.11 for package: mysql-community-client-8.0.25-1.el7.x86_64
---> Package mysql-community-common.x86_64 0:8.0.25-1.el7 will be installed
--> Running transaction check
---> Package mysql-community-client-plugins.x86_64 0:8.0.25-1.el7 will be installed
---> Package mysql-community-libs.x86_64 0:8.0.25-1.el7 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
=====================================================================================================================================
Package Arch Version Repository Size
=====================================================================================================================================
Installing:
mysql-community-server x86_64 8.0.25-1.el7 mysql80-community 428 M
Installing for dependencies:
mysql-community-client x86_64 8.0.25-1.el7 mysql80-community 46 M
mysql-community-client-plugins x86_64 8.0.25-1.el7 mysql80-community 189 k
mysql-community-common x86_64 8.0.25-1.el7 mysql80-community 614 k
mysql-community-libs x86_64 8.0.25-1.el7 mysql80-community 4.0 M
Transaction Summary
=====================================================================================================================================
Install 1 Package (+4 Dependent packages)
Total download size: 478 M
Installed size: 2.2 G
Is this ok [y/d/N]: y
从安装过程可以看出，一些包被废弃，一些被更新，包之间的依赖被自动处理，整个过程几乎不需要人工介入，非常方便。
如有其它低版本的 MySQL 安装需求，比如 5.7 版本，那么可以将源文件中[mysql80-community]下的配置项 enabled 改为 0，同时将[mysql57-community] 下对应参数改为 1。或者使用如下命令更改更方便：
yum-config-manager --disable mysql80-community
yum-config-manager --enable mysql57-community
3、启动 MySQL
[root@mgr04 ~]# systemctl start mysqld.service
[root@mgr04 ~]# systemctl status mysqld.service
● mysqld.service - MySQL Server
Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
Active: active (running) since Wed 2021-05-19 22:56:38 CST; 11s ago
Docs: man:mysqld(8)
http://dev.mysql.com/doc/refman/en/using-systemd.html
Process: 29586 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)
Main PID: 29680 (mysqld)
Status: "Server is operational"
CGroup: /system.slice/mysqld.service
└─29680 /usr/sbin/mysqld
May 19 22:56:28 mgr04 systemd[1]: Starting MySQL Server...
May 19 22:56:38 mgr04 systemd[1]: Started MySQL Server.
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