title: centos yum fails installing anything or updating system
body: <p>I am trying to install a package on CentOS, but it throws error when I run the "yum" command. The internet connection is working fine.
  I try to yum clean all but problem persist.</p>
  
  <p>Error:</p>
  
  <pre><code>[root@dcos-master3 ~]# yum install ntp
  
  Loaded plugins: fastestmirror
  
  
       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=&lt;repoid&gt; ...
  
           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 &lt;repoid&gt;
              or
                  subscription-manager repos --disable=&lt;repoid&gt;
  
           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=&lt;repoid&gt;.skip_if_unavailable=true
  
      Cannot find a valid baseurl for repo: base/$releasever/x86_64
  </code></pre>
  
  <p>My yum repolist is the next:</p>
  
  <pre><code>[root@dcos-master3 ~]# yum repolist list
  Loaded plugins: fastestmirror
  https://yum.dockerproject.org/repo/main/centos/%24releasever/repodata/repomd.xml: [Errno 14] HTTPS Error 403 - Forbidden
  Trying other mirror.
  To address this issue please refer to the below knowledge base article
  
  https://access.redhat.com/solutions/69319
  
  If above article doesn't help to resolve this issue please create a bug on https://bugs.centos.org/
  
  repolist: 0
  </code></pre>
  
  <p>If I list the repolist:</p>
  
  <pre><code>[root@dcos-master3 ~]# yum repolist
  Loaded plugins: fastestmirror
  https://yum.dockerproject.org/repo/main/centos/%24releasever/repodata/repomd.xml: [Errno 14] HTTPS Error 403 - Forbidden
  Trying other mirror.
  To address this issue please refer to the below knowledge base article
  
  https://access.redhat.com/solutions/69319
  
  If above article doesn't help to resolve this issue please create a bug on https://bugs.centos.org/
  
  repo id                             repo name                             status
  base/$releasever/x86_64             CentOS-$releasever - Base             0
  dockerrepo/$releasever              Docker Repository                     0
  extras/$releasever/x86_64           CentOS-$releasever - Extras           0
  updates/$releasever/x86_64          CentOS-$releasever - Updates          0
  repolist: 0
  </code></pre>