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当遇到yum下载时，出现下面报错情况时：
One of the configured repositories failed (local),
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=local ...
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 local
or
subscription-manager repos --disable=local
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=local.skip_if_unavailable=true
failure: repodata/repomd.xml from local: [Errno 256] No more mirrors to try.
file:///repodata/repomd.xml: [Errno 14] curl#37 - "Couldn't open file /repodata/repomd.xml"
1.备份原有yum源命令：
[root@localhost ~]# mv /etc/yum.repos.d /etc/yum.repos.d.bak
2.创建yum源目录：
[root@localhost ~]# mkdir /etc/yum.repos.d
3.下载阿里云yum源配置：
[root@localhost ~]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
4.重建缓存：
[root@localhost ~]# yum clean all
[root@localhost ~]# yum makecache
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