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12-dns-addon.md

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Deploying the DNS Cluster Add-on

In this lab you will deploy the DNS add-on which provides DNS based service discovery to applications running inside the Kubernetes cluster.

The DNS Cluster Add-on

Deploy the kube-dns cluster add-on:

kubectl apply -f https://raw.githubusercontent.com/e-minguez/kubernetes-the-hard-way-osp/master/deployments/coredns.yaml

output

serviceaccount/coredns created
clusterrole.rbac.authorization.k8s.io/system:coredns created
clusterrolebinding.rbac.authorization.k8s.io/system:coredns created
configmap/coredns created
deployment.apps/coredns created
service/kube-dns created

List the pods created by the kube-dns deployment:

kubectl get pods -l k8s-app=kube-dns -n kube-system

output

NAME                     READY   STATUS    RESTARTS   AGE
coredns-5fb99965-2fdbp   1/1     Running   0          4m39s
coredns-5fb99965-4z2qm   1/1     Running   0          4m38s

Verification

Create a busybox deployment:

kubectl run --generator=run-pod/v1 busybox --image=busybox:1.28 --command -- sleep 3600

Execute a DNS lookup for the kubernetes service inside the busybox pod:

kubectl exec -ti busybox -- nslookup kubernetes

output

Server:    10.32.0.10
Address 1: 10.32.0.10 kube-dns.kube-system.svc.cluster.local

Name:      kubernetes
Address 1: 10.32.0.1 kubernetes.default.svc.cluster.local

Next: Smoke Test