错误显示：

软件包：mysql-community-server-5.7.20-1.el6.x86_64 (mysql57-community)

 需要：libsasl2.so.2()(64bit)

 您可以尝试添加 --skip-broken 选项来解决该问题

 您可以尝试执行：rpm -Va --nofiles --nodigest

解决方法：

修改/etc/yum.repos.d/mysql-community.repo 源文件

[mysql57-community]name=MySQL 5.7 Community Server## baseurl=http://repo.mysql.com/yum/mysql-5.7-community/el/6/$basearch/   baseurl=http://repo.mysql.com/yum/mysql-5.7-community/el/7/$basearch/enabled=1gpgcheck=0gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

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