参考：http://dev.MySQL.com/doc/mysql-yum-repo-quick-guide/en/
1.增加yum数据源
（1.1）从http://dev.mysql.com/downloads/repo/yum/ 获取合适的数据源
（1.2）安装数据源包
shell> sudo rpm -Uvh platform-and-version-specific-package-name.rpmeg：安装 Red Hat EnterPRise linux 7 / Oracle Linux 7 (Architecture Independent), RPM Package
shell> wget http://repo.mysql.com/mysql57-community-release-el7-7.noarch.rpmshell> sudo rpm-Uvh mysql57-community-release-el7-7.noarch.rpm
2.选择合适的安装版本
（2.1）查看mysql数据源中存在的包
shell> sudo yum repolist all | grep mysql
（2.2）编辑 /etc/yum.repos.d/mysql-community.repo，启用相应的mysql版本
# Enable to use MySQL 5.6[mysql56-community]name=MySQL 5.6 Community Serverbaseurl=http://repo.mysql.com/yum/mysql-5.6-community/el/7/$basearch/enabled=0gpgcheck=1gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql[mysql57-community]name=MySQL 5.7 Community Serverbaseurl=http://repo.mysql.com/yum/mysql-5.7-community/el/7/$basearch/enabled=1gpgcheck=1gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
ps: "enabled=1" 启用，"enabled=0" 禁用，上述配置则是安装"mysql 5.7"，禁用"mysql 5.6"
（2.3）查看mysql启用列表
shell > sudo yum repolist enabled | grep mysqlmysql-connectors-community/x86_64 MySQL Connectors Community 17mysql-tools-community/x86_64 MySQL Tools Community 27mysql57-community/x86_64 MySQL 5.7 Community Server 20
3.安装mysql
shell> sudo yum install mysql-community-server
注意：在使用yum 安装 mysql 5.7过程中，会随机生成一个临时的root密码保存到错误日志（"/var/log/mysqld.log")，可以使用如下命令进行查看：
shell > sudo grep 'temporary passWord' /var/log/mysqld.log
因此安装mysql 5.7后，需要尽快修改密码。
4.启动mysql服务器
shell> yum --disablerepo=/* --enablerepo='mysql*-community*' list available
（4.1）启动命令
shell> sudo service mysqld start（4.2）查看mysql状态
shell> sudo service mysqld status5.mysql_secure_installation
使用mysql_secure_installation设置root密码，删除匿名用户等重要操作
shell> mysql_secure_installation
ps: 更多操作参考
http://dev.mysql.com/doc/refman/5.7/en/mysql-secure-installation.html
http://dev.mysql.com/doc/refman/5.7/en/default-privileges.html
6.安装mysql额外工具
（6.1）查看可用包名
shell> mysql_secure_installation
（6.2）安装包
shell> sudo yum install 包名
如：安装 mysql-workbench-community
shell> sudo yum install mysql-workbench-community
7.升级mysql
（7.1）编辑 /etc/yum.repos.d/mysql-community.repo
（7.2）执行update
shell> sudo yum update mysql-server
或者使用下述命令更新所有包
shell> sudo yum update
8. centos7默认使用mariadb数据库代替mysql，先将mariadb相关包卸载
（8.1）查询 maridb 包命令
shell> sudo rpm -qa | grep -i mariadb
（8.2）删除
shell> sudo rpm -e 相关包名新闻热点
疑难解答
