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4.5 测试集群的正确性 |
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在lab1节点上执行如下的步骤，验证Kubernetes集群部署是否正确可用。
1）部署Nginx应用：
$ kubectl create deployment nginx --image=nginx:alpine deployment.apps/nginx created
2）暴露Nginx应用：
$ kubectl expose deployment nginx --name=nginx-service --port=80 --target-
port=80
service/nginx-service exposed
$ kubectl expose deployment nginx --type=NodePort --name=nginx-service-nodeport
--port=80 --target-port=80
service/nginx-service-nodeport exposed
3）查看Nginx应用状态：
$ kubectl get deploy NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE nginx 1 1 1 1 2m9s $ kubectl get pod NAME READY STATUS RESTARTS AGE nginx-65d5c4f7cc-ztkkf 1/1 Running 0 2m9s $ kubectl get svc NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 3h5m nginx-service ClusterIP 10.106.97.98 <none> 80/TCP 96s nginx-service-nodeport NodePort 10.106.177.223 <none> 80:31994/TCP 44s
4）通过Pod IP访问Nginx应用。
查看Nginx应用的Pod IP：
$ kubectl get pod -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE nginx-65d5c4f7cc-ztkkf 1/1 Running 0 6m4s 10.244.1.3 lab2 <none>
访问Nginx应用，10.244.1.3为上一步骤中查看到的Pod IP：
curl -I http://10.244.1.3/ HTTP/1.1 200 OK Server: nginx/1.15.8 Date: Sun, 13 Jan 2019 04:54:30 GMT Content-Type: text/html Content-Length: 612 Last-Modified: Wed, 26 Dec 2018 23:21:49 GMT Connection: keep-alive ETag: "5c240d0d-264" Accept-Ranges: bytes
5）通过Cluster IP访问Nginx应用。
查看Nginx应用的Cluster IP：
$ kubectl get svc nginx-service NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE nginx-service ClusterIP 10.106.97.98 <none> 80/TCP 22m
访问Nginx应用，10.106.97.98为上一步骤中查看到的Cluster IP：
curl -I http://10.106.97.98/ HTTP/1.1 200 OK Server: nginx/1.15.8 Date: Sun, 13 Jan 2019 04:55:03 GMT Content-Type: text/html Content-Length: 612 Last-Modified: Wed, 26 Dec 2018 23:21:49 GMT Connection: keep-alive ETag: "5c240d0d-264" Accept-Ranges: bytes
6）通过NodePort访问Nginx应用。
查看Nginx应用的Cluster IP：
$ kubectl get svc nginx-service-nodeport NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE nginx-service-nodeport NodePort 10.105.227.107 <none> 80:31499/TCP 110s
访问Nginx应用，31499为上一步骤中查看到的NodePort：
curl -I http://lab1:31499/ HTTP/1.1 200 OK Server: nginx/1.15.8 Date: Sun, 13 Jan 2019 04:55:58 GMT Content-Type: text/html Content-Length: 612 Last-Modified: Wed, 26 Dec 2018 23:21:49 GMT Connection: keep-alive ETag: "5c240d0d-264" Accept-Ranges: bytes curl -I http://lab2:31499/ HTTP/1.1 200 OK Server: nginx/1.15.8 Date: Sun, 13 Jan 2019 04:56:37 GMT Content-Type: text/html Content-Length: 612 Last-Modified: Wed, 26 Dec 2018 23:21:49 GMT Connection: keep-alive ETag: "5c240d0d-264" Accept-Ranges: bytes curl -I http://lab3:31499/ HTTP/1.1 200 OK Server: nginx/1.15.8 Date: Sun, 13 Jan 2019 04:56:54 GMT Content-Type: text/html Content-Length: 612 Last-Modified: Wed, 26 Dec 2018 23:21:49 GMT Connection: keep-alive ETag: "5c240d0d-264" Accept-Ranges: bytes
7）DNS解析测试。
部署测试Pod：
#生成部署文件 $ cat >dns-test.yaml<<EOF apiVersion: v1 kind: Pod metadata: name: dns-test spec: containers: - image: radial/busyboxplus:curl name: dns-test stdin: true tty: true resources: requests: cpu: 50m memory: 50Mi limits: cpu: 100m memory: 100Mi EOF #部署 $ kubectl apply -f dns-test.yaml #查看状态 $ kubectl get pod dns-test NAME READY STATUS RESTARTS AGE dns-test 1/1 Running 0 84s
DNS解析测试：
$ kubectl exec dns-test -- nslookup kubernetes Server: 10.96.0.10 Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local Name: kubernetes Address 1: 10.96.0.1 kubernetes.default.svc.cluster.local $ kubectl exec dns-test -- nslookup nginx-service Server: 10.96.0.10 Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local Name: nginx-service Address 1: 10.106.97.98 nginx-service.default.svc.cluster.local $ kubectl exec dns-test -- nslookup www.baidu.com Server: 10.96.0.10 Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local Name: www.baidu.com Address 1: 115.239.210.27 Address 2: 115.239.211.112
8）通过DNS访问Nginx应用：
$ kubectl exec dns-test -- curl -s -I http://nginx-service/ HTTP/1.1 200 OK Server: nginx/1.15.8 Date: Sun, 13 Jan 2019 05:12:22 GMT Content-Type: text/html Content-Length: 612 Last-Modified: Wed, 26 Dec 2018 23:21:49 GMT Connection: keep-alive ETag: "5c240d0d-264" Accept-Ranges: bytes
9）清理：
$ kubectl delete service nginx-service-nodeport $ kubectl delete service nginx-service $ kubectl delete deployment nginx $ kubectl delete -f dns-test.yaml