centos7出現yum之類的問題的時候可能是加入的一些源導致的問題最佳的解決方案

//傻逼的我胡搞出現不知道添加什么軟件源到/etc/yum.repo中結果出現了一堆錯-搜了很長時間沒解決-算了-返璞歸真（回到初始的狀態）吧，看了一下別人的阿里云的服務器中初始的時候都有什么源 結果就（CentOS-Base.repo ,epel.repo）就這兩個源 好吧現在把所有的除了這兩個源都編程 **.repo.bak
然后 yum clean all yum makecache
這樣就可以了

[root@iz2ze1ci0m3dzopy4m0byfz ~]# yum update
Loaded plugins: fastestmirror
base | 3.6 kB 00:00:00
epel | 3.2 kB 00:00:00
extras | 3.4 kB 00:00:00
mysql-connectors-community | 2.5 kB 00:00:00
mysql-tools-community | 2.5 kB 00:00:00
mysql57-community | 2.5 kB 00:00:00
Could not retrieve mirrorlist http://apt.sw.be/redhat/el6/en/mirrors-rpmforge error was
14: curl#6 – “Could not resolve host: apt.sw.be; Name or service not known”
http://apt.sw.be/redhat/el6/en/x86_64/rpmforge/repodata/repomd.xml: [Errno 14] curl#6 – “Could not resolve host: apt.sw.be; Name or service not known”
Trying other mirror.

One of the configured repositories failed (RHEL 7 – RPMforge.net – dag),
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=rpmforge ...     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 rpmforge      or          subscription-manager repos --disable=rpmforge     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=rpmforge.skip_if_unavailable=true  

failure: repodata/repomd.xml from rpmforge: [Errno 256] No more mirrors to try.
http://apt.sw.be/redhat/el6/en/x86_64/rpmforge/repodata/repomd.xml: [Errno 14] curl#6 – “Could not resolve host: apt.sw.be; Name or service not known”
但是這個錯我真的不知道是什么意思-哪位大佬遇到這個錯知道是什么意思能解決的話，麻煩留言。