输入
yum install docker-compose后报错：
Loaded plugins: fastestmirror
base | 3.6 kB 00:00:00
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= ...
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
or
subscription-manager repos --disable=
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=.skip_if_unavailable=true
Cannot retrieve metalink for repository: epel/x86_64. Please verify its path and try again
yum -y install epel-release
rpm -ivh http://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
Retrieving http://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
curl: (6) Could not resolve host: dl.fedoraproject.org; Unknown error
error: skipping http://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm - transfer failed
ping了一下ip，发现能ping通，但是ping百度，却无法ping通，说明无法解析域名
于是找了个解决办法
yum安装时错误ERRNO 14 couldn’t resolve host 解决办法
说是DNS服务器错误。是修改了/etc/resolv.conf
添加了一个nameserver8.8.8.8完成
来自：blog.csdn.net/spyiu/article/details/25163101
再次ping百度，可以ping通 ，通过
rpm -ivh
http://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
安装docker-compose成功
