Centos7 yum源挂在、磁盘挂在、percona-xtrabackup安装、qpress安装. Couldn‘t open file /xxx/repodata/repomd.xml 问题处理

添加yum源 之后 还出现这个错误：Couldn't open file /xxx/repodata/repomd.xml 

在执行 yum clean all  

在执行 yum makecache  出现这个错误 failure: repodata/repomd.xml from localrepo: [Errno 256] No more mirrors to try.
file:///iso/repodata/repomd.xml: [Errno 14] curl#37 - "Couldn't open file /iso/repodata/repomd.xml"

file:///iso/repodata/repomd.xml: [Errno 14] curl#37 - "Couldn't open file /iso/repodata/repomd.xml"
Trying other mirror.
Trying other mirror.


 One of the configured repositories failed (localrepo),
 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=localrepo ...

     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 localr