yum沒法下載，網關問題

 

因爲網關地址改變沒有及時更新配置，形成沒法下載

failure: repodata/repomd.xml from base: [Errno 256] No more mirrors to try

http://mirrors.neusoft.edu.cn/centos/7.6.1810/os/x86_64/Packages/tftp-5.2-22.el7.x86_64.rpm: [Errno -1] Package does not match intended download. Suggestion: run yum --enablerepo=base clean metadata
Trying other mirror.

 

當時不知道緣由，執行 yum clean all 後  出現如下錯誤

One of the configured repositories failed (Unknown),
and yum doesn't have enough cached data to continue. At this point the only
safe thing yum can do is fail. There are a few ways to work "fix" this:

Cannot find a valid baseurl for repo: base/7/x86_64

當出現以上問題的時候，能夠檢查一下網關配置