笔者使用的系统是CentOS 6.5 , 使用yum安装mysql的默认版本是5.1，如果想安装指定版本的mysql，可以通过本帖的方式进行。本文以安装MySQL 5.6为例进行说明。
1、从mysql的官网下载 rpm文档 （下载地址：MySQL官网下载地址）， 根据自己的系统下载响应的版本 ，下载下来的文件是一个rpm格式的压缩包。笔者下载的版本是：
2、查看linux系统中是否有mysql的repo ：
[root@cdh1 files]# yum repolist all | grep mysql
[root@cdh1 files]# yum remove mysql*[root@cdh1 files]# vi /etc/yum.repos.d/mysql-community.repo[mysql-connectors-community]
name=MySQL Connectors Community
baseurl=http://repo.mysql.com/yum/mysql-connectors-community/el/6/$basearch/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
[mysql-tools-community]
name=MySQL Tools Community
baseurl=http://repo.mysql.com/yum/mysql-tools-community/el/6/$basearch/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
# Enable to use MySQL 5.5
[mysql55-community]
name=MySQL 5.5 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.5-community/el/6/$basearch/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
# Enable to use MySQL 5.6
[mysql56-community]
name=MySQL 5.6 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.6-community/el/6/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
[mysql57-community]
name=MySQL 5.7 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.7-community/el/6/$basearch/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
[mysql80-community]
name=MySQL 8.0 Community Server
baseurl=http://repo.mysql.com/yum/mysql-8.0-community/el/6/$basearch/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
[mysql-tools-preview]
name=MySQL Tools Preview
baseurl=http://repo.mysql.com/yum/mysql-tools-preview/el/6/$basearch/
enabled=0
gpgcheck=1
gpgkey=file:/etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
[mysql-cluster-7.5-community]
name=MySQL Cluster 7.5 Community
baseurl=http://repo.mysql.com/yum/mysql-cluster-7.5-community/el/6/$basearch/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
[mysql-cluster-7.6-community]
name=MySQL Cluster 7.6 Community
baseurl=http://repo.mysql.com/yum/mysql-cluster-7.6-community/el/6/$basearch/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
以上内容可以在第一步下载的rpm包中复制（路径：\etc\yum.repos.d\mysql-community.repo , 下载的rpm包，解压之后仍是一个压缩包，再次解压即可看到上述路径）。从上述路径复制的代码，需要做一定的修改，将 MySQL 5.6中的 enabled属性置位1 ，其他所有的enabled都置位0。保存退出。做完这一步之后，再次进行步骤2的验证，如果配置正确，就能看到只有5.6的选项为 enabled。
[root@cdh1 files]# yum repolist all | grep mysql
mysql-cluster-7.5-community MySQL Cluster 7.5 Community disabled
mysql-cluster-7.6-community MySQL Cluster 7.6 Community disabled
mysql-connectors-community MySQL Connectors Community disabled
mysql-tools-community MySQL Tools Community disabled
mysql-tools-preview MySQL Tools Preview disabled
mysql55-community MySQL 5.5 Community Server disabled
mysql56-community MySQL 5.6 Community Server enabled: 396
mysql57-community MySQL 5.7 Community Server disabled
mysql80-community MySQL 8.0 Community Server disabled
[root@cdh1 files]# vi /etc/pki/rpm-gpg/RPM-GPG-KEY-mysql-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.4.5 (GNU/Linux)mQGiBD4+owwRBAC14GIfUfCyEDSIePvEW3SAFUdJBtoQHH/nJKZyQT7h9bPlUWC3
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=HfUN
-----END PGP PUBLIC KEY BLOCK-----
5、安装
[root@cdh1 files]# yum install mysql-community-server -y如果上面的步骤都配置正确，应该就能自动下载mysql的安装包进行安装！
6、启动服务，进行验证：
[root@cdh1 files]# service mysqld start
省略启动日志。。。
[root@cdh1 files]# mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.6.38 MySQL Community Server (GPL)Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.mysql>
补充：如果想将mysql的服务加入到开机启动，可使用如下命令：
[root@cdh1 files]# chkconfig mysqld on
[root@cdh1 files]# chkconfig --list mysqld
mysqld 0:off 1:off 2:on 3:on 4:on 5:on 6:off
