[SR-Users] Kamailio IMS as kubernetes pods

[Abdirahman A. Osman]

David,

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.
>

If you set   *clusterIP: None* in the services, you will get POD IP.

Abdirahman



On Wed, 26 Aug 2020 at 10:48, Pavithra Mohanraja <pavimohan3004 at gmail.com>
wrote:

> 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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>>>>>>
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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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>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>>
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