Re: [SR-Users] Kamailio IMS as kubernetes pods

Hello Abdirahman, Thanks for replying. Do you mean if I create a service for the label selector of what’s running in the pod, but ser ClusterIP: None, when another pod tries to resolve that service, it will get the actual IP of the running POD? On Wed, 26 Aug 2020 at 18:02, Abdirahman A. Osman < abdirahman.osm(a)gmail.com&gt; wrote: > Hi Pavithra, > > Since POD IPs change, you have to rely on DNS records. To have a fixed > DNS name like > > kamailio.kamalio-service.namespace.svc.cluster.local > > > > for a pod you will have to use StatefullSet, so the pod DNS name > doesn't change. Also you have to use Services and set it to ClusterIP: > none, it will turn your pods to headless services and no load balancing is > involved. and from my understanding you will be able to reach each POD > directly through the DNS name. > https://kubernetes.io/docs/concepts/services-networking/service/ > > and don't forget to set your /etc/resolv.conf with the kubedns IP > address. > > Abdirahman > > > > On Wed, 26 Aug 2020 at 12:45, Pavithra Mohanraja < > pavimohan3004(a)gmail.com&gt; wrote: > >> Hi Abdirahman, >> >> Do you mean , if I set clusterIP as None, then kubedns server will be >> pointing to pod ip so that kubedns/coredns will use pod ip for pod >> communication instead of service IP. >> >> >> Is my understanding correct? From your explanation. >> >> If this is the case, pod ip will be changing whenever I launch the >> pods . How that can be resolved. >> >> Could you kindly helo me with this? >> >> >> Thanks, >> Pavithra >> >> On Wed, Aug 26, 2020, 9:26 PM Abdirahman A. Osman < >> abdirahman.osm(a)gmail.com&gt; wrote: >> >>> 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(a)gmail.com&gt; 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(a)gmail.com&gt; 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(a)gmail.com&gt; 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 &lt;s.safarov(a)gmail.com&gt; >>>>>> 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(a)gmail.com&gt; 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(a)gmail.com&gt; 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(a)gmail.com&gt; 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 >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> _______________________________________________ >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> Kamailio (SER) - Users Mailing List >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> sr-users(a)lists.kamailio.org >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>> >>>>>>>>> _______________________________________________ >>>>>>>>> >>>>>>>>> >>>>>>>>> Kamailio (SER) - Users Mailing List >>>>>>>>> >>>>>>>>> >>>>>>>>> sr-users(a)lists.kamailio.org >>>>>>>>> >>>>>>>>> >>>>>>>>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>> >>>>>>>> _______________________________________________ >>>>>>>> >>>>>>>> >>>>>>>> Kamailio (SER) - Users Mailing List >>>>>>>> >>>>>>>> >>>>>>>> sr-users(a)lists.kamailio.org >>>>>>>> >>>>>>>> >>>>>>>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>> >>>>>>> _______________________________________________ >>>>>>> >>>>>>> >>>>>>> Kamailio (SER) - Users Mailing List >>>>>>> >>>>>>> >>>>>>> sr-users(a)lists.kamailio.org >>>>>>> >>>>>>> >>>>>>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users >>>>>>> >>>>>>> >>>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> >>>>>> Kamailio (SER) - Users Mailing List >>>>>> >>>>>> sr-users(a)lists.kamailio.org >>>>>> >>>>>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users >>>>>> >>>>>> -- >>>>> Regards, >>>>> >>>>> David Villasmil >>>>> email: david.villasmil.work(a)gmail.com >>>>> phone: +34669448337 >>>>> >>>>> >>>>> _______________________________________________ >>>>> >>>>> >>>>> Kamailio (SER) - Users Mailing List >>>>> >>>>> >>>>> sr-users(a)lists.kamailio.org >>>>> >>>>> >>>>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users >>>>> >>>>> >>>>> >>>> >>>> >>> >>> >> >> > > -- Regards, David Villasmil email: david.villasmil.work(a)gmail.com phone: +34669448337