topic Re: Where is the dns pod in "Contiv and Kubernetes" SandBox in DevNet Sandbox

Where is the dns pod in "Contiv and Kubernetes" SandBox

chungewa — Tue, 04 Jun 2019 09:30:09 GMT

Hello

In this sandbox, i cant find the dns pod, how is the cluster dealing with service discovering?

Thanks a ton!

[root@netmaster ~]# kubectl get pods --all-namespaces -o wide

NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE

kube-system contiv-api-proxy-52jwg 1/1 Running 1 2h 10.10.20.1 netmaster

kube-system contiv-etcd-r69kv 1/1 Running 0 2h 10.10.20.1 netmaster

kube-system contiv-netmaster-f04zj 1/1 Running 1 2h 10.10.20.1 netmaster

kube-system contiv-netplugin-0kfm0 1/1 Running 0 2h 10.10.20.3 k8s-worker-2

kube-system contiv-netplugin-2z02d 1/1 Running 0 2h 10.10.20.2 k8s-worker-1

kube-system contiv-netplugin-f0phz 1/1 Running 0 2h 10.10.20.4 k8s-worker-3

kube-system contiv-netplugin-wpr3c 1/1 Running 0 2h 10.10.20.1 netmaster

kube-system dummy-2088944543-n793h 1/1 Running 0 2h 10.10.20.1 netmaster

kube-system etcd-netmaster 1/1 Running 0 2h 10.10.20.1 netmaster

kube-system kube-apiserver-netmaster 1/1 Running 0 2h 10.10.20.1 netmaster

kube-system kube-controller-manager-netmaster 1/1 Running 0 2h 10.10.20.1 netmaster

kube-system kube-discovery-1769846148-gx8ch 1/1 Running 0 2h 10.10.20.1 netmaster

kube-system kube-proxy-6x86k 1/1 Running 0 2h 10.10.20.3 k8s-worker-2

kube-system kube-proxy-d3k70 1/1 Running 0 2h 10.10.20.2 k8s-worker-1

kube-system kube-proxy-fnh3s 1/1 Running 0 2h 10.10.20.1 netmaster

kube-system kube-proxy-jgszz 1/1 Running 0 2h 10.10.20.4 k8s-worker-3

kube-system kube-scheduler-netmaster 1/1 Running 0 2h 10.10.20.1 netmaster

kube-system kubernetes-dashboard-2521145884-q2d05 1/1 Running 0 2h 10.96.0.2 k8s-worker-3

Jason

Re: Where is the dns pod in "Contiv and Kubernetes" SandBox

thodavie — Wed, 10 May 2017 07:59:50 GMT

Hey! Hope you're enjoying the Sandbox!

When you deploy Contiv, the K8s DNS is removed. Contiv has it's own DNS.

You can hit Contiv for more details and the latest documentation.

Re: Where is the dns pod in "Contiv and Kubernetes" SandBox

chungewa — Thu, 11 May 2017 07:44:28 GMT

when i get the service:

[root@netmaster multi-tier]# kubectl get service -o wide --all-namespaces

NAMESPACE NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR

default frontend 10.101.5.87 <nodes> 80:32195/TCP 44m app=guestbook,tier=frontend

default kubernetes 10.96.0.1 <none> 443/TCP 1d <none>

kube-system kube-dns 10.96.0.10 <none> 53/UDP,53/TCP 1d name=kube-dns

kube-system kubernetes-dashboard 10.102.32.215 <nodes> 80:32465/TCP 1d app=kubernetes-dashboard

sounds in our sandbox, cluster using kube-dns, but not contiv dns, am i right?

thx!

Re: Where is the dns pod in "Contiv and Kubernetes" SandBox

zowu — Thu, 11 May 2017 12:20:03 GMT

Hi Chungewa,

We've removed kube-dns pod from deployment since Contiv has built-in DNS service in VXLAN mode. The associated kube-dns service has no active endpoint and cannot provide any DNS service. The advertised cluster-IP of kube-dns i.e. 10.96.0.10 was pre-configured by kubelet, and we may also delete it in our next release.

Please change your /etc/resolv.conf like this in your pod:(suppose you are using default-net, and 10.96.0.2 is netmaster address)

echo "nameserver 10.96.0.2" > /etc/resolv.conf

Thanks again for your interest on our Contiv sandbox.

Regards,

Bob

Re: Where is the dns pod in "Contiv and Kubernetes" SandBox

chungewa — Fri, 12 May 2017 01:09:16 GMT

Thanks,

thats just make sense

Re: Where is the dns pod in "Contiv and Kubernetes" SandBox

Vallard Benincosa — Thu, 20 Jul 2017 22:49:01 GMT

Note that the 1.1.0 version of contiv (not currently used in the sandbox today) with kubernetes 1.6+ does in fact allow the use of kube-dns and doesn't delete it.

Re: Where is the dns pod in "Contiv and Kubernetes" SandBox

zowu — Fri, 28 Jul 2017 11:13:46 GMT

We've upgraded Kubneretes to 1.6.7 and Contiv to latest 1.1.1. And our sandbox now supports kube-dns pod.