I am installing openstack juno using packstack on centos7 on a one controller and two compute setup.

I am getting the following error :

Installing Dependencies                           [ ERROR ]

ERROR : Failed to run remote script, stdout: Loaded plugins: fastestmirror

stderr: Warning: Permanently added '10.129.2.57' (ECDSA) to the list of known hosts.
+ trap t ERR
+ yum install -y puppet hiera openssh-clients tar nc rubygem-json


 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. 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 <repoid>

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=<repoid>.skip_if_unavailable=true

Cannot find a valid baseurl for repo: base/7/x86_64
++ t
++ exit 1

Please check log file /var/tmp/packstack/20141226-155445-zPaWRI/openstack-setup.log for more information

I searched for this error online and found people facing this problem but no solution. Is it a puppet issue because my yum update is working?

Please help me in this regard.
Thanks,

Priyanka

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