[SR-Users] Kamailio IMS as kubernetes pods

[Pavithra Mohanraja]

Hi,
Thanks for the answers.
@David has got my question.

I have a seperate dns server running in my pcscf pod . So in my
/etc/resolv.conf file , I would be configuring
nameserver <pcscf pod ip>
in all other cscf pods as well for communication.



My question here is how to change the dns server pointing to cluster ip so
that my domain name for IMS will be pointing to coredns itself. It will
restrict me from using pod IP since it changes everytime.


@David, can you please tell me the last two lines briefly. I did not get
it.how you configured . You mean to say still you are using pod Ip.


On Wed, Aug 26, 2020, 8:02 PM David Villasmil <
david.villasmil.work at gmail.com> wrote:

> 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 at 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 at 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 at 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 at 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 at 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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>>>>>>
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>>>>>>
>>>>>>
>>>>>>
>>>>>
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>> --
> Regards,
>
> David Villasmil
> email: david.villasmil.work at gmail.com
> phone: +34669448337
> _______________________________________________
> Kamailio (SER) - Users Mailing List
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