# 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/kelseyhightower/kubernetes-the-hard-way/master/services/kubedns.yaml ``` ``` kubectl --namespace=kube-system get svc ``` ``` NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE kube-dns 10.32.0.10 53/UDP,53/TCP 5s ``` Create the `kubedns` deployment: ``` kubectl create -f https://raw.githubusercontent.com/kelseyhightower/kubernetes-the-hard-way/master/deployments/kubedns.yaml ``` ``` kubectl --namespace=kube-system get pods ``` ``` NAME READY STATUS RESTARTS AGE kube-dns-321336704-6749s 4/4 Running 0 10s ```