We resolved the problem by running a dedicated DNS server on the local
network, allowing local and remote names to be resolved. This was
necessary because the particular openstack networking environment that
was available did not have the ability to resolve local host names.
Ideally we'll try to fix that so that the dedicated DNS server is not
needed, but that's what we're having to do for now.
p.s. the .etc/resolve.conf does contain that search directive.
On 08/11/2017 17:29, Pablo Halamaj wrote:
Tim,
I have a similar problem , but mine appears when the S2I container try
to push the image, it couldn't resolv the registry hostname.
can you check the resolv.conf file on your nodes and search for a line
like this?
"search cluster.local"
Regards
2017-10-24 12:55 GMT-03:00 Tim Dudgeon <tdudgeon...@gmail.com
<mailto:tdudgeon...@gmail.com>>:
I'm having difficulty with dns resolution when using the ansible
installer in an openstack environment.
Part of the problem is that openstack does not seem able to
resolve hostnames on the local subnet and so some tricks/hacks are
needed (this is not an openshift issue but if anyone knows how to
solve this I'd love to hear!).
However, with those tricks/hacks I end up with nodes that have 2
nameservers defined in the /etc/resolv.conf, one that resolves
external hostnames and one that can resolve hostnames on the local
subnet.
When the ansible installer runs it first checks that hostnames can
be resolved and finds they can. Then it installs everything and
part of this is updating the DNS setup so that dnsmasq is
installed on the node and the /etc/resolv.conf updated to now
contains ONLY the IP address of the node as the nameserver.
Consequently it can no longer resolve local hostnames and so the
openshift pods can't find each other.
I think what is needed is to tell this installer what other
nameservers to put into the resolv.conf?
Any help with this would be appreciated.
Tim
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