只需在/etc/yum.repos.d/目录下添加以下文件mysql-community.repo文件，内容如下：

# Enable to use MySQL 5.6
[mysql56-community]
name=MySQL 5.6 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.6-community/el/5/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

以上对应的是5.6版本。

5.7版本的内容如下：

# Note: MySQL 5.7 is currently in development. For use at your own risk.
# Please read with sub pages: https://dev.mysql.com/doc/relnotes/mysql/5.7/en/
[mysql57-community-dmr]
name=MySQL 5.7 Community Server Development Milestone Release
baseurl=http://repo.mysql.com/yum/mysql-5.7-community/el/6/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

最后执行yum install mysql-community-server即可。

我用的是5.6版本的内容，在安装的过程中，报以下错误：

GPG key retrieva l failed: [Errno 14] curl#37 - "Couldn't open file /etc/pki/rpm-gpg/RPM-GPG-KEY-mysql"

很显然，本地没有RPM-GPG-KEY-mysql文件，于是对上文的mysql-community.repo做了一下修改，修改后的内容如下：

[mysql56-community]
name=MySQL 5.6 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.6-community/el/5/$basearch/
enabled=1
gpgcheck=0

重新执行yum install mysql-community-server命令，安装OK~

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