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

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2019-02-17 19:09:20 +09:00
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docs/12-dns-addon.md
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@@ -1,13 +1,16 @@
# 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
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
@@ -24,7 +27,7 @@ service/kube-dns created
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
@@ -40,13 +43,13 @@ coredns-699f8ddd77-gtcgb 1/1 Running 0 20s
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:
```
kubectl get pods -l run=busybox
$ kubectl get pods -l run=busybox
```
> output
@@ -59,13 +62,13 @@ busybox-bd8fb7cbd-vflm9 1/1 Running 0 10s
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:
```
kubectl exec -ti $POD_NAME -- nslookup kubernetes
$ kubectl exec -ti $POD_NAME -- nslookup kubernetes
```
> output