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12-dns-addon.md

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Deploying the DNS Cluster Add-on

이번 실습에서는 Kubernetes cluster안에서 실행되는 어플리케이션들에 대해서, CoreDNS를 이용한 DNS 기반 service discovery를 하는 DNS add-on을 배포하겠습니다.

The DNS Cluster Add-on

coredns add-on 배포:

ssh k8s-client

kubectl apply -f https://storage.googleapis.com/kubernetes-the-hard-way/coredns-1.8.yaml

output

serviceaccount/coredns created
clusterrole.rbac.authorization.k8s.io/system:coredns created
clusterrolebinding.rbac.authorization.k8s.io/system:coredns created
configmap/coredns created
deployment.extensions/coredns created
service/kube-dns created

kube-dns deployment로 생성된 pods 리스트 확인:

kubectl get pods -l k8s-app=kube-dns -n kube-system

output

NAME                       READY   STATUS    RESTARTS   AGE
coredns-699f8ddd77-94qv9   1/1     Running   0          20s
coredns-699f8ddd77-gtcgb   1/1     Running   0          20s

Verification

busybox deployment 생성:

kubectl run --generator=run-pod/v1 busybox --image=busybox:1.28 --command -- sleep 3600

busybox deployment로 생성된 pod 리스트 확인:

kubectl get pods -l run=busybox

output

NAME      READY   STATUS    RESTARTS   AGE
busybox   1/1     Running   0          3s

busybox pod의 full name 확인:

POD_NAME=$(kubectl get pods -l run=busybox -o jsonpath="{.items[0].metadata.name}")

kubernetes service에서 busybox pod의 DNS lookup 실행:

kubectl exec -ti $POD_NAME -- 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