From 1e443750bbfc2c9fc409b67a922ac299395cfd4c Mon Sep 17 00:00:00 2001
From: Pick1a1username <20301273+Pick1a1username@users.noreply.github.com>
Date: Sun, 17 Feb 2019 19:09:20 +0900
Subject: [PATCH] The chapter 'Deploying the DNS Cluster Add-on' is updated.

---
 docs/12-dns-addon.md | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/docs/12-dns-addon.md b/docs/12-dns-addon.md
index 67c5e5b..603b5e9 100644
--- a/docs/12-dns-addon.md
+++ b/docs/12-dns-addon.md
@@ -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