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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 create -f https://raw.githubusercontent.com/lpmi-13/kubernetes-the-hard-way-do/main/deployments/core-dns.yaml

output

service "kube-dns" created
serviceaccount "kube-dns" created
configmap "kube-dns" created
deployment.extensions "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-7cb4c7458d-p7hxn   3/3       Running   0          20s

Verification

Create a dnsutils pod

kubectl run busybox --image=busybox:1.28.4 --restart=Never -- sleep 3600

Verify that the pod is running:

kubectl get pod busybox

Output:

NAME       READY     STATUS    RESTARTS   AGE
busybox   1/1       Running   0          45s

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

kubectl exec -it 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