failure: repodata/repomd.xml from c7-media: [Errno 256] No more mirrors to try.

[HWY_猿]

崩溃，这问题到底怎么解决？
以前这个阿里yum源都用得好好的，突然就不能用了，我的配置应该没啥问题，毕竟以前用着没问题，但参照网上的方法，都没能解决这问题。help help help!

环境：
Centos7-6
阿里yum源
问题：
[root@localhost yum.repos.d]# yum list
已加载插件：fastestmirror, langpacks
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* c7-media:
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com
base | 3.6 kB 00:00:00
file:///media/CentOS/repodata/repomd.xml: [Errno 14] curl#37 - "Couldn't open file /media/CentOS/repodata/repomd.xml"
正在尝试其它镜像。
file:///media/cdrecorder/repodata/repomd.xml: [Errno 14] curl#37 - "Couldn't open file /media/cdrecorder/repodata/repomd.xml"
正在尝试其它镜像。
file:///media/cdrom/repodata/repomd.xml: [Errno 14] curl#37 - "Couldn't open file /media/cdrom/repodata/repomd.xml"
正在尝试其它镜像。


One of the configured repositories failed (CentOS-7 - Media),
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=c7-media ...

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 c7-media
or
subscription-manager repos --disable=c7-media

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=c7-media.skip_if_unavailable=true

failure: repodata/repomd.xml from c7-media: [Errno 256] No more mirrors to try.
file:///media/CentOS/repodata/repomd.xml: [Errno 14] curl#37 - "Couldn't open file /media/CentOS/repodata/repomd.xml"
file:///media/cdrecorder/repodata/repomd.xml: [Errno 14] curl#37 - "Couldn't open file /media/cdrecorder/repodata/repomd.xml"
file:///media/cdrom/repodata/repomd.xml: [Errno 14] curl#37 - "Couldn't open file /media/cdrom/repodata/repomd.xml"
[root@localhost yum.repos.d]#


说明：这条试过，不行
yum clean all
yum makecache
yum update

[HWY_猿]

看这问题时，要看原始网页，不能自动翻译了，不然看着怪得一批
1.原来可用的，后来突然不行
2.这条试过，不行
yum clean all
yum makecache
yum update
3.网络是通的
救救渣渣

[HWY_猿]

问题已解决
方法步骤：
1.作死先把以下与yum源相关的卸载掉
yum-utils-1.1.31-50.el7.noarch
yum-3.4.3-161.el7.centos.noarch
yum-langpacks-0.4.2-7.el7.noarch
yum-plugin-fastestmirror-1.1.31-50.el7.noarch
yum-metadata-parser-1.1.4-10.el7.x86_64
2.这时yum命令用不了了，得把它们装回去，至于怎么装，网上有个wget的方法，我不熟这个，所以直接把虚拟光盘（镜像文件？）里面的安装包复制到自己随便创建的一个目录下，然后把它们逐个安装了。不过它们之间有依赖关系，所以我采用了忽略依赖关系的方式进行强制安装。命令：rmp -ivh yum-utils-1.1.31-50.el7.noarch --nodeps
原理
我自己也不知道为啥它就可以了

[污妖王之怒]

cd /etc/yum.repos.d下的文件先备份，之后找个yum好使的服务器的文件将cd /etc/yum.repos.d下的文件拷贝过去 之后 yum clean all yum makecache yum update ;我的问题出现两天了，今天刚解决