EPEL was my problem as well. This helped me: http://www.tecmint.com/how-to-enable-epel-repository-for-rhel-centos-6-5/ (http://www.tecmint.com/how-to-enable-...)

Set enable=1 in the epel.list file, sometimes i don't know why but RDO disable this option. May happen several times during your installation. First install the needed packages and then re run packstack

are you sure you are using the right repos? because yes it can be changed tomorrow. So, try to use the updated repo and check the url yourself. sometimes you will find the url working but a the packages moved o another dir. so adjust it in the sources and retry the installation.

Setup EPEL 7 for CentOS 7 or EPEL 6 for for CentOS 6.5 and try :
/usr/bin/yum -d 0 -e 0 -y list erlang

[root@icehouse1 ~(keystone_admin)]# /usr/bin/yum -d 0 -e 0 list erlang
Installed Packages
erlang.x86_64                                     R16B-03.7.el7                                     @epel

View also recent thread https://ask.openstack.org/en/question...
regarding your most recent update.

I got same error and EPEL WAS already installed as well. Than I installed Erlang package by using below command.

Yum --enablerepo=epel info erlang

Yum --enablerepo=epel install erlang

1st check Erlang package is available in epel if not than update epel.

After that use that command. And problem solved.

the same as me,I have reported a bug on launchpad:https://bugs.launchpad.net/packstack/+bug/1382731

FWIW, the same issue has recently been reported on the Japan OpenStack User Group mailing list: https://groups.google.com/forum/#!topic/openstack-ja/b6wojDFUw40 (https://groups.google.com/forum/#!top...)

The easy workaround is to use --use-epel=y, but it's still a bug as Packstack is supposed to recognize enterprise distros automatically and enable EPEL instead of disable it.