Comment 20 for bug 1730931

@Paul, DNS issues are topic of this bug and source of problem in gate jobs. So maybe it's better to split this bug for two and to talk about services in separate bug? Because we try to talk about 2 different issues here in parallel and it's not productive for problem solution.

And back to topic of the bug, as I see from unbound logs we query for these hostnames:
http://logs.openstack.org/55/520055/4/check/legacy-tripleo-ci-centos-7-nonha-multinode-oooq/fce0b13/logs/undercloud/var/lib/unbound/unbound.log.txt.gz

mirror.centos.org
mirror.iad.rax.openstack.org.
mirror01.iad.rax.openstack.org.
trunk.rdoproject.org.
trunk-backup.rdoproject.org.
pypi.python.org.
prod.python.map.fastly.net.
github.com.
download.cirros-cloud.net. (handled in https://review.openstack.org/520349)

I'd like to set unbound for debug, it doesn't cost us anything. In case of DNS resolving failure we will catch the problem in log.