error on docker build

gistfile1.txt

Step 13 : RUN yum -y install mod_ssl sendmail sendmail-cf     && yum clean all
 ---> Running in 4508cbfff184
Loaded plugins: fastestmirror
http://ftp.riken.jp/Linux/fedora/epel/7/x86_64/repodata/repomd.xml: [Errno -1] repomd.xml does not match metalink for epel
Trying other mirror.
http://ftp.jaist.ac.jp/pub/Linux/Fedora/epel/7/x86_64/repodata/repomd.xml: [Errno -1] repomd.xml does not match metalink for epel
Trying other mirror.
http://ftp.tsukuba.wide.ad.jp/Linux/fedora/epel/7/x86_64/repodata/repomd.xml: [Errno -1] repomd.xml does not match metalink for epel
Trying other mirror.
http://kartolo.sby.datautama.net.id/EPEL/7/x86_64/repodata/repomd.xml: [Errno -1] repomd.xml does not match metalink for epel
Trying other mirror.
https://free.nchc.org.tw/fedora-epel/7/x86_64/repodata/repomd.xml: [Errno -1] repomd.xml does not match metalink for epel
Trying other mirror.
http://epel.scopesky.iq/7/x86_64/repodata/repomd.xml: [Errno -1] repomd.xml does not match metalink for epel
Trying other mirror.
http://epel.mirror.net.in/epel/7/x86_64/repodata/repomd.xml: [Errno -1] repomd.xml does not match metalink for epel
Trying other mirror.
http://mirror01.idc.hinet.net/EPEL/7/x86_64/repodata/repomd.xml: [Errno -1] repomd.xml does not match metalink for epel
Trying other mirror.
http://mirror.wanxp.id/epel/7/x86_64/repodata/repomd.xml: [Errno -1] repomd.xml does not match metalink for epel
Trying other mirror.
http://mirror.pregi.net/epel/7/x86_64/repodata/repomd.xml: [Errno -1] repomd.xml does not match metalink for epel
Trying other mirror.
http://mirror.premi.st/epel/7/x86_64/repodata/repomd.xml: [Errno -1] repomd.xml does not match metalink for epel
Trying other mirror.


 One of the configured repositories failed (Extra Packages for Enterprise Linux 7 - x86_64),
 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. Disable the repository, 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 epel

     4. 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=epel.skip_if_unavailable=true

failure: repodata/repomd.xml from epel: [Errno 256] No more mirrors to try.
http://ftp.riken.jp/Linux/fedora/epel/7/x86_64/repodata/repomd.xml: [Errno -1] repomd.xml does not match metalink for epel
http://ftp.jaist.ac.jp/pub/Linux/Fedora/epel/7/x86_64/repodata/repomd.xml: [Errno -1] repomd.xml does not match metalink for epel
http://ftp.tsukuba.wide.ad.jp/Linux/fedora/epel/7/x86_64/repodata/repomd.xml: [Errno -1] repomd.xml does not match metalink for epel
http://kartolo.sby.datautama.net.id/EPEL/7/x86_64/repodata/repomd.xml: [Errno -1] repomd.xml does not match metalink for epel
https://free.nchc.org.tw/fedora-epel/7/x86_64/repodata/repomd.xml: [Errno -1] repomd.xml does not match metalink for epel
http://epel.scopesky.iq/7/x86_64/repodata/repomd.xml: [Errno -1] repomd.xml does not match metalink for epel
http://epel.mirror.net.in/epel/7/x86_64/repodata/repomd.xml: [Errno -1] repomd.xml does not match metalink for epel
http://mirror01.idc.hinet.net/EPEL/7/x86_64/repodata/repomd.xml: [Errno -1] repomd.xml does not match metalink for epel
http://mirror.wanxp.id/epel/7/x86_64/repodata/repomd.xml: [Errno -1] repomd.xml does not match metalink for epel
http://mirror.pregi.net/epel/7/x86_64/repodata/repomd.xml: [Errno -1] repomd.xml does not match metalink for epel
http://mirror.premi.st/epel/7/x86_64/repodata/repomd.xml: [Errno -1] repomd.xml does not match metalink for epel
The command '/bin/sh -c yum -y install mod_ssl sendmail sendmail-cf     && yum clean all' returned a non-zero code: 1