centos6、7在线升级mysql到mysql5.7

centos7对mysql进行在线升级： ①下载mysql源 wget http://dev.mysql.com/get/mysql57-community-release-el7-7.noarch.rpm ②安装mysql5.7源 yum localinstall -y mysql57-community-release-el7-7.noarch.rpm ③安装数据库服务器 yum instal

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