部署 DNS 扩展

本部分将部署 DNS 扩展,用于为集群内的应用提供服务发现。

DNS 扩展

部属 kube-dns 群集扩展:

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

输出为

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

列出 kube-dns 部署的 Pod 列表:

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

输出为

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

验证

建立一个 busybox 部署:

kubectl run busybox --image=busybox --command -- sleep 3600

列出 busybox 部署的 Pod:

kubectl get pods -l run=busybox

输出为

NAME                       READY     STATUS    RESTARTS   AGE
busybox-2125412808-mt2vb   1/1       Running   0          15s

查询 busybox Pod 的全名:

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

busybox Pod 中查询 DNS:

kubectl exec -ti $POD_NAME -- nslookup kubernetes

输出为

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

下一步:烟雾测试

© Pengfei Ni all right reserved,powered by GitbookUpdated at 2019-01-21 15:38:22

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