centos7下安装MySQL
CentOS 7的yum源中没有正常安装MySQL时的mysql-sever文件，需要去官网上下载。地址是： https://dev.mysql.com/downloads/repo/yum/ ，然后到下方选择原地址的包名（可能会随着时间而改变）：mysql57-community-release-el7-11.noarch.rpm#下载yum源的命令为
wget http://dev.mysql.com/downloads/get/mysql57-community-release-el7-11.noarch.rpm
#安装yum源的命令为
rpm -ivh mysql57-community-release-el7-11.noarch.rpm 或者用 yum localinstall mysql57-community-release-el7-11.noarch.rpm
#检查mysql源是否安装成功
yum repolist enabled | grep "mysql.*-community.*"
#安装mysql
yum install mysql-community-server
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