How to use dynamic IP in resolver directive when NGINX installed on Multi Nodes Openshift cluster

[Marwan Bayadsi]

Hi,

We're from Amdocs and trying to install NGINX reverse proxy server on openshift cluster (6 nodes),  and as part of its configuration, we must specify the DNS IP to directive - 'resolver'   (because proxy_pass has some parameters).
Nginx.conf:
                    Location ~ {
resolver DNS_IP valid=5s;
proxy_pass .....
}
But - since it's OCP cluster (multiple machines), we don't know which IP to give - as it depends on which node the nginx pod was started (in /etc/resolv.conf - it has the relevant node IP).    Also - we cannot put all IPs in parameters.
We ask for advice to:

1.      How we can force nginx to user /etc/resolv.conf  even if proxy_pass has parameters.   This will solve our issues.

2.      If #1 is not possible,  which display name we can put for resolver within open-shift cluster ?   for example - in K8S, we solved the issue by using kube-dns:
resolver kube-dns.kube-system.svc.cluster.local valid=5s;

               Which string is relevant for DNS inside open-shift cluster ?

Please assist.


Thanks,
Marwan

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