使用centos7.0安装mysql报错，如下所示：

　　原因是阿里云提供的一键安装包配置环境，会更新为阿里云的yum源，切换到CentOS的官方yum就可以了

　　编辑yum源文件/etc/yum.repos.d/epel.repo，将内容修改成下面的内容

　　[epel]

　　name=Extra Packages for Enterprise Linux 7 - $basearch

　　#baseurl=http://download.fedoraproject.org/pub/epel/7/$basearch

　　mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-7&arch=$basearch

　　failovermethod=priority

　　enabled=1

　　gpgcheck=0

　　gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7

　　[epel-debuginfo]

　　name=Extra Packages for Enterprise Linux 7 - $basearch - Debug

　　#baseurl=http://download.fedoraproject.org/pub/epel/7/$basearch/debug

　　mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-debug-7&arch=$basearch

　　failovermethod=priority

　　enabled=0

　　gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7

　　gpgcheck=1

　　[epel-source]

　　name=Extra Packages for Enterprise Linux 7 - $basearch - Source

　　#baseurl=http://download.fedoraproject.org/pub/epel/7/SRPMS

　　mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-source-7&arch=$basearch

　　failovermethod=priority

　　enabled=0

　　gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7

　　gpgcheck=1

　　然后：# yum makecache

　　执行完之后检查下yum repolist

　　然后执行yum install mysql就能够安装mysql了