Kubernetes(K8S)（三）——Kubernetes的資源清單

1.Kubernetes的資源清單的介紹

官網參考：https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.18/#deployment-v1-apps
命令參考：kubectl explain pod

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2. 自主式Pod資源清單

[kubeadm@server1 ~]$ mkdir mainfest
[kubeadm@server1 ~]$ cd mainfest/
[kubeadm@server1 mainfest]$ ls
[kubeadm@server1 mainfest]$ vim pod.yml
[kubeadm@server1 mainfest]$ cat pod.yml
apiVersion: v1
kind: Pod
metadata:
  name: myapp
spec:
  containers:
    - name: myapp
      image: myapp:v1
[kubeadm@server1 mainfest]$ kubectl create -f pod.yml
pod/myapp created
[kubeadm@server1 mainfest]$ kubectl get pod
NAME    READY   STATUS    RESTARTS   AGE
myapp   1/1     Running   0          9s
[kubeadm@server1 mainfest]$ kubectl get pod -o wide
NAME    READY   STATUS    RESTARTS   AGE     IP            NODE      NOMINATED NODE   READINESS GATES
myapp   1/1     Running   0          4m16s   10.244.1.13   server2   <none>           <none>
[kubeadm@server1 mainfest]$ curl 10.244.1.13
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>

[kubeadm@server1 mainfest]$ kubectl delete -f pod.yml ##自主式pod清單的修改需要先刪除在創建
pod "myapp" deleted
[kubeadm@server1 mainfest]$ vim pod.yml
[kubeadm@server1 mainfest]$ cat pod.yml
apiVersion: v1
kind: Pod
metadata:
  name: myapp
spec:
  containers:
    - name: myapp
      image: myapp:v2
[kubeadm@server1 mainfest]$ kubectl create -f pod.yml
pod/myapp created
[kubeadm@server1 mainfest]$ kubectl get pod -o wide
NAME    READY   STATUS    RESTARTS   AGE   IP            NODE      NOMINATED NODE   READINESS GATES
myapp   1/1     Running   0          3s    10.244.2.14   server3   <none>           <none>
[kubeadm@server1 mainfest]$ curl 10.244.2.14
Hello MyApp | Version: v2 | <a href="hostname.html">Pod Name</a>

3.控制器部署pod清單

[kubeadm@server1 mainfest]$ kubectl delete -f pod.yml
pod "myapp" deleted
[kubeadm@server1 mainfest]$ vim pod2.yml
[kubeadm@server1 mainfest]$ cat pod2.yml
apiVersion: apps/v1
kind: Deployment
metadata:
  # Unique key of the Deployment instance
  name: deployment-example
spec:
  # 3 Pods should exist at all times.
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        # Apply this label to pods and default
        # the Deployment label selector to this value
        app: nginx
    spec:
      containers:
      - name: nginx
        # Run this image
        image: myapp:v1

[kubeadm@server1 mainfest]$ kubectl create -f pod2.yml
deployment.apps/deployment-example created
[kubeadm@server1 mainfest]$ kubectl get pod
NAME                                  READY   STATUS    RESTARTS   AGE
deployment-example-7d5c95894c-4snlm   1/1     Running   0          29s
deployment-example-7d5c95894c-88t4h   1/1     Running   0          29s
deployment-example-7d5c95894c-tlxfs   1/1     Running   0          29s
[kubeadm@server1 mainfest]$ kubectl get pod --show-labels
NAME                                  READY   STATUS    RESTARTS   AGE   LABELS
deployment-example-7d5c95894c-4snlm   1/1     Running   0          60s   app=nginx,pod-template-hash=7d5c95894c
deployment-example-7d5c95894c-88t4h   1/1     Running   0          60s   app=nginx,pod-template-hash=7d5c95894c
deployment-example-7d5c95894c-tlxfs   1/1     Running   0          60s   app=nginx,pod-template-hash=7d5c95894c
[kubeadm@server1 mainfest]$ vim pod2.yml