Huawei cloud Kubernetes administrator training four Homework

Exercise 1

Creating a Service and a Pod as its backend. The information obtained by the Service and the corresponding Endpoints kubectl describe.

Name Service for<hwcka-004-1-svc-你的华为云id>
Pod name is<hwcka-004-1-pod-你的华为云id>
The full command used yaml shots, Service Endpoints and upload

First create a pod, pay attention to add tags. Because Pod and Service will associate by the label.

[root@svn ch4]# cat pod.yaml
apiVersion: v1
kind: Pod
metadata:
  name: hwcka-004-1-pod-joyo
  labels:
    app: nginx
spec:
  containers:
  - name: nginx
    image: nginx:alpine

[root@svn ch4]# kubectl apply -f pod.yaml
pod/hwcka-004-1-pod-joyo created

[root@svn ch4]# kubectl get pod
NAME                   READY   STATUS    RESTARTS   AGE
busybox                1/1     Running   13         20h
hwcka-004-1-pod-joyo   1/1     Running   0          13s
[root@svn ch4]#

Subsequently the pod is exposed service

kubectl expose pod hwcka-004-1-pod-joyo --port=8888 --target-port=80 --name=hwcka-004-1-svc-joyo

Testing and validation:

[root@svn ch4]# kubectl get svc
NAME                   TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)    AGE
hwcka-004-1-svc-joyo   ClusterIP   10.101.211.222   <none>        8888/TCP   4m19s
kubernetes             ClusterIP   10.96.0.1        <none>        443/TCP    41d

[root@svn ch4]# kubectl get ep
NAME                   ENDPOINTS              AGE
hwcka-004-1-svc-joyo   10.244.2.179:80        8m22s
kubernetes             192.168.202.130:6443   41d


[root@svn ch4]# k describe svc hwcka-004-1-svc-joyo
Name:              hwcka-004-1-svc-joyo
Namespace:         default
Labels:            app=nginx
Annotations:       <none>
Selector:          app=nginx
Type:              ClusterIP
IP:                10.101.211.222
Port:              <unset>  8888/TCP
TargetPort:        80/TCP
Endpoints:         10.244.2.179:80
Session Affinity:  None
Events:            <none>

And running curl 10.244.2.179:80and curl 10.101.211.222:8888can see the Welcome to nginx!welcome page.

English II

Creating a Service and a Pod as its backend. Pod nslookup query by the Service of domain name information.

Name Service for<hwcka-004-2-你的华为云id>
The command, Service and upload the screenshot Pod domain information

First create Pod.

kubectl run nginx --image=nginx:alpine --generator=run-pod/v1

Pod is then exposed Service.

kubectl expose pod nginx --port=8888 --target-port=80 --name=hwcka-004-2-joyo

Service and Pod's Whois Information

[root@svn ch4]# kubectl exec -it busybox -- nslookup hwcka-004-2-joyo
Server:    10.96.0.10
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local

Name:      hwcka-004-2-joyo
Address 1: 10.110.24.8 hwcka-004-2-joyo.default.svc.cluster.local

[root@svn ch4]# kubectl exec -it busybox -- nslookup nginx
Server:    10.96.0.10
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local

Name:      nginx
Address 1: ::ffff:67.215.82.154
Address 2: 67.215.82.154

busybox.yaml content (under test environment, not allowed to download nslookup package, but you can pull the mirror, so we use busybox: 1.28 inside the nslookup command)

apiVersion: v1
kind: Pod
metadata:
  name: busybox
  namespace: default
spec:
  containers:
  - name: busybox
    image: busybox:1.28
    command:
      - sleep
      - "3600"
    imagePullPolicy: IfNotPresent
  restartPolicy: Always