不工作 yum update （yum 沒有足夠的記憶體數據繼續）

我已經在centos 7上通過yum成功安裝了東西。然後我安裝了epel repo（yum install epel-release）並總是給我以下錯誤，之後我無法安裝任何東西

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:

1. Contact the upstream for the repository and get them to fix the problem.

2. Reconfigure the baseurl/etc. for the repository, to point to a working
   upstream. This is most often useful if you are using a newer
   distribution release than is supported by the repository (and the
   packages for the previous distribution release still work).

3. Run the command with the repository temporarily disabled
       yum --disablerepo=<repoid> ...

4. Disable the repository permanently, so yum won't use it by default. Yum
   will then just ignore the repository until you permanently enable it
   again or use --enablerepo for temporary usage:

       yum-config-manager --disable <repoid>
   or
       subscription-manager repos --disable=<repoid>

5. Configure the failing repository to be skipped, if it is unavailable.
   Note that yum will try to contact the repo. when it runs most commands,
   so will have to try and fail each time (and thus. yum will be be much
   slower). If it is a very temporary problem though, this is often a nice
   compromise:

       yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true

我在網際網路上搜尋了很多，但我找不到解決方案。有些人可能來自代理。即使我將代理資訊添加到 yum.conf，但我還是失敗了。

然後我想檢查一下，如果我刪除了 epel repo，那麼它可能會起作用，然後我從系統中刪除了 epel-repo，之後我就可以安裝了。

請幫助我我花了兩天時間解決這個問題

正如您所發現的，epel-release 包導致了這個問題。如果您還沒有：

# yum remove epel-release

然後使用以下內容安裝 EPEL Repo（需要 wget 包）：

# wget http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-9.noarch.rpm
# rpm -ivh epel-release-7-9.noarch.rpm

從那裡你應該能夠毫無問題地進行 yum update 。

我剛剛在使用新的 CentOS 7.6 時遇到了這個問題

解決方案很簡單：

• 不要刪除軟體包epel-release（如果您已經刪除了它，請安裝它）

• 編輯文件/etc/yum.repos.d/epel.repo

• 在第一節 ( [epel]) 中：

  • 評論metalink=https://...
  • 取消註釋baseurl=http://...

這為我解決了這個問題。

引用自：https://unix.stackexchange.com/questions/345124