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Deploying the Cluster DNS Add-on

In this lab you will deploy the DNS add-on which is required for every Kubernetes cluster. Without the DNS add-on the following things will not work:

  • DNS based service discovery
  • DNS lookups from containers running in pods

Cluster DNS Add-on

kubectl create clusterrolebinding serviceaccounts-cluster-admin \
  --clusterrole=cluster-admin \
  --group=system:serviceaccounts

Create the kubedns service:

kubectl create -f https://raw.githubusercontent.com/sapcc/kubernetes-the-hard-way/master/services/kubedns.yaml

kubectl --namespace=kube-system get svc

NAME       CLUSTER-IP   EXTERNAL-IP   PORT(S)         AGE
kube-dns   10.180.1.254   <none>        53/UDP,53/TCP   5s

Create the kubedns deployment:

kubectl create -f https://raw.githubusercontent.com/sapcc/kubernetes-the-hard-way/master/deployments/kubedns-1_14_4.yaml

kubectl --namespace=kube-system get pods

NAME                       READY     STATUS    RESTARTS   AGE
kube-dns-321336704-6749s   4/4       Running   0          10s