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The chapter 'Deploying the DNS Cluster Add-on' is updated.

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docs/12-dns-addon.md
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# Deploying the DNS Cluster Add-on # Deploying the DNS Cluster Add-on
In this lab you will deploy the [DNS add-on](https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/) which provides DNS based service discovery, backed by [CoreDNS](https://coredns.io/), to applications running inside the Kubernetes cluster. In this chapter, you will deploy the [DNS add-on](https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/) which provides DNS based service discovery, backed by [CoreDNS](https://coredns.io/), to applications running inside the Kubernetes cluster.
**All procedures in this chapter should be done in `client-1`.**
## The DNS Cluster Add-on ## The DNS Cluster Add-on
Deploy the `coredns` cluster add-on: Deploy the `coredns` cluster add-on:
``` ```
kubectl apply -f https://storage.googleapis.com/kubernetes-the-hard-way/coredns.yaml $ kubectl apply -f https://storage.googleapis.com/kubernetes-the-hard-way/coredns.yaml
``` ```
> output > output
@ -24,7 +27,7 @@ service/kube-dns created
List the pods created by the `kube-dns` deployment: List the pods created by the `kube-dns` deployment:
``` ```
kubectl get pods -l k8s-app=kube-dns -n kube-system $ kubectl get pods -l k8s-app=kube-dns -n kube-system
``` ```
> output > output
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Create a `busybox` deployment: Create a `busybox` deployment:
``` ```
kubectl run busybox --image=busybox:1.28 --command -- sleep 3600 $ kubectl run busybox --image=busybox:1.28 --command -- sleep 3600
``` ```
List the pod created by the `busybox` deployment: List the pod created by the `busybox` deployment:
``` ```
kubectl get pods -l run=busybox $ kubectl get pods -l run=busybox
``` ```
> output > output
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Retrieve the full name of the `busybox` pod: Retrieve the full name of the `busybox` pod:
``` ```
POD_NAME=$(kubectl get pods -l run=busybox -o jsonpath="{.items[0].metadata.name}") $ POD_NAME=$(kubectl get pods -l run=busybox -o jsonpath="{.items[0].metadata.name}")
``` ```
Execute a DNS lookup for the `kubernetes` service inside the `busybox` pod: Execute a DNS lookup for the `kubernetes` service inside the `busybox` pod:
``` ```
kubectl exec -ti $POD_NAME -- nslookup kubernetes $ kubectl exec -ti $POD_NAME -- nslookup kubernetes
``` ```
> output > output