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下载mysqly的yum仓库
wget -i -c http://dev.mysql.com/get/mysql57-community-release-el7-10.noarch.rpm
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安装mysql的yum源
yum -y install mysql57-community-release-el7-10.noarch.rpm
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安装指定版本mysql,这里的5.7.9表示版本号
yum -y install mysql-community-server-5.7.9
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安装成功,启动
systemctl start mysqld.service



