**yum clean all
yum makecache **
linux知識:http://www.51kxg.com/index.php/archives/1115
https://www.bilibili.com/video/bv1cj411u78z?p=3
https://www.bilibili.com/video/bv1tt4y1x7qh?from=search&seid=12998419180107224490 比較好的
https://centos.pkgs.org/? rpm安裝包的
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寫入自己的部落格中才能記得長久