I’ve been trying to figure this out as well.

I haven’t yet found a way of publishing to kube-dns the pod IP of the running service.

I.e.:

kamailio.whatever.local on ip 10.0.0.1

Rtpengine.whatever.local on ip 10.0.0.2

Appserver.whatever.local on 10.0.0.3

Assuming those are pod ips. Using services doesn’t work since the dns name will resolve to a k8s service ip and no the actual pod running the service.

Assigning IPs hardcoded doesn’t work either since it might change if the docker changes pod. I can have multiple modes on which a service can run, but only one service (kamailio, rtpengine, appserver, etc) will run on a given pod.

On Wed, 26 Aug 2020 at 15:18, Abdirahman A. Osman <abdirahman.osm@gmail.com> wrote:

Hi

Pavithra

You can use the kubedns/CoreDNS of the kubernetes cluster to resolve Internal DNS records of the pods.To assign DNS records for each POD you have to deploy a service and set the ClusterIP: none. and the dns record will be something like kamailio.kamalio-service.platform.svc.cluster.local
which is the podname.servicename.namespace.svc.cluster.local

In the resolve.conf you will put the kubeDNS/CoreDNS IP as the nameserver. You can set this in the kubernetes manifest file

dnsPolicy: "None"
dnsConfig:
nameservers:
- 10.34.0.1 (

kubeDNS/CoreDNS )

Abdirahman

On Tue, 25 Aug 2020 at 15:34, Sergey Safarov <s.safarov@gmail.com> wrote:
I am not k8s developer.
So cannot provide detailed instructions. Just my point of view.

You can look
https://kubernetes.io/docs/concepts/extend-kubernetes/operator/
https://www.magalix.com/blog/creating-custom-kubernetes-operators

On Tue, Aug 25, 2020 at 7:41 PM Pavithra Mohanraja <pavimohan3004@gmail.com> wrote:
Hi,

It would be helpful if you could elaborate what has to be done for kubernetes pods when you mention sip ingress

Thanks,

Pavithra

On Tue, Aug 25, 2020, 9:32 PM Sergey Safarov <s.safarov@gmail.com> wrote:
Lot of issues with static IP in Kubernetes.

Looks as need deploy "sip ingress" like "HTTP/HTTPS ingress" and then route calls to pods.

On Tue, Aug 25, 2020 at 4:40 PM Pavithra Mohanraja <pavimohan3004@gmail.com> wrote:
Hi,

I am configuring kamailio IMS as kubernetes pods .
so each component will be configured as separate pod .
In order to establish a connection between pods , I am configuring bind9 dns server in pcscf pod itself. Communication is happening via Pod IP address.

Is there any possibility to have the communication using cluster IP . If anybody is aware of kubernetes, Please help me in this regard.

I have my /etc/resolv.conf file in pods with
nameserver <clusterIP>
search <cluster-dns-domain-name>

Please help.

Thanks,
Pavithra

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