Linux centos7yum下载安装报:软件包与预期下载的不符。建议：运行 yum --enablerepo=updates clean metadata尝试其他镜像。

rm -f /var/lib/rpm/__*

rpm --rebuilddb -v -v

yum clean dbcache

yum clean metadata

yum clean rpmdb

yum clean headers

yum clean all

rm -rf /var/cache/yum/timedhosts.txt

rm -rf /var/cache/yum/*

yum makecache