Docker異常:Cannot find a valid baseurl for repo:base/7/x 86_64

に質問
Dockerfileでミラーを構築する場合、yumコマンドを使用すると、次のような異常が発生する可能性があります.

 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 find a valid baseurl for repo: base/7/x86_64
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=container error was
14: curl#7 - "Failed to connect to 2001:4178:5:200::10: Network is unreachable"
The command '/bin/sh -c yum -y update' returned a non-zero code: 1

解決策
ネットワークが通じないため、Dockerfileにnameserverを追加すればよい.

From centos  
RUN echo "nameserver 144.144.144.144" >> /etc/resolv.conf
RUN yum -y update  
RUN yum -y install httpd  
EXPOSE 80  
CMD /usr/sbin/apachectl -D FOREGROUND