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16.Kubernetes之Deployment

云博小周宇1 Min Read

Deployment在继承Pod和Replicaset的所有特性的同时, 它可以实现对template模板进行实时滚动更新并具备我们线上的Application life circle的特性。

1.创建Deployment

# vi deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: httpd-deployment
  labels:
    app: httpd-deployment
spec:
  replicas: 2
  selector:
    matchLabels:
      app: httpd-demo
  template:
    metadata:
      labels:
        app: httpd-demo
    spec:
      containers:
      - name: httpd image: httpd imagePullPolicy: Always ports: - containerPort: 80 env: - name: VERSION value: "v1" # kubectl create -f deployment.yaml

2.查看Deployment

# kubectl get deployment NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE httpd-deployment 2 2 2 2 8d # kubectl get pods -o wide NAME READY STATUS RESTARTS AGE IP NODE httpd-deployment-956697567-8mqch 1/1 Running 0 8d 10.244.0.36 kube-master httpd-deployment-956697567-wcbs6 1/1 Running 0 8d 10.244.0.37 kube-master # kubectl describe deployment ...

3.更新deployment

通过此命令可以呼出vi编辑器对模板进行编辑.

# kubectl edit -f deployment.yaml

通过此命令使当前编辑结果生效.

# kubectl apply -f deployment.yaml

再次查看可以看到老版本的deployment已经下架, 新版本的已经生效.

# kubectl get deployment NAME DESIRED CURRENT READY AGE httpd-deployment-6b98d94474 0 0 0 1m httpd-deployment-956697567 2 2 2 7m

4.扩容与缩容

可以修改replicas的赋值对deployment进行扩容与缩容

# kubectl scale deployment/httpd-deployment --replicas=1

5.删除deployment

# kubectl delete deployment httpd-deployment

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