Haproxy NOSRV for keystone resulted in "Could not prefetch keystone_role provider 'openstack': Execution of '/usr/bin/openstack role list --quiet --format csv' returned 1: ERROR: openstack Service Unavailable (HTTP 503)"

[Andrey Sledzinskiy]

Ceph cluster deployment failed with Could not prefetch keystone_role provider 'openstack': Execution of '/usr/bin/openstack role list --quiet --format csv' returned 1: ERROR: openstack Service Unavailable (HTTP 503)

Steps:
1. Create next cluster - Ubuntu, HA, Neutron vlan, ceph for volumes, images, ephemeral, 1 controller, 1 compute+ceph, 1 ceph
2. Start deployment

Actual result - deployment failed with
node-1 2015-08-16T23:53:26.016889 err: Could not prefetch keystone_role provider 'openstack': Execution of '/usr/bin/openstack role list --quiet --format csv' returned 1: ERROR: openstack Service Unavailable (HTTP 503)

VERSION:
  feature_groups:
    - mirantis
  production: "docker"
  release: "7.0"
  openstack_version: "2015.1.0-7.0"
  api: "1.0"
  build_number: "176"
  build_id: "2015-08-14_17-24-26"
  nailgun_sha: "eaaf1233c613c6e08bcf99ee09ebb1bdb7dd4e31"
  python-fuelclient_sha: "4c74a60aa60c06c136d9197c7d09fa4f8c8e2863"
  fuel-agent_sha: "57145b1d8804389304cd04322ba0fb3dc9d30327"
  fuel-nailgun-agent_sha: "e01693992d7a0304d926b922b43f3b747c35964c"
  astute_sha: "e24ca066bf6160bc1e419aaa5d486cad1aaa937d"
  fuel-library_sha: "db1c04c9de65c8e107475967d86c7a5791ef3853"
  fuel-ostf_sha: "17786b86b78e5b66d2b1c15500186648df10c63d"
  fuelmain_sha: "d8c726645be087bc67e2eeca134f0f9747cfeacd"

[Bogdan Dobrelya (bogdando)]

Haproxy started reporting:
2015-08-16T23:53:25.971098+00:00 node-1 haproxy info: 10.109.7.4:33757 [16/Aug/2015:23:53:25.970] keystone-1 keystone-1/<NOSRV> 0/-1/-1/-1/0 503 212 - - SC-- 2/0/0
/0/0 0/0 "POST /v3/auth/tokens HTTP/1.1"

till the end of the test.
Although, both keystone admin and main wsgi apps were running

[Bogdan Dobrelya (bogdando)]

This issue looks also related to https://bugs.launchpad.net/fuel/+bug/1485597/comments/2, here is the OSC commands flow http://paste.openstack.org/show/v9q9Ds97CH7OFDCCTPOP/

[Bogdan Dobrelya (bogdando)]

Also related https://bugs.launchpad.net/fuel/+bug/1485644

[Bogdan Dobrelya (bogdando)]

This bug appeared to be the dup of bug 1480153 instead