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deployment扩容缩容比较简单，下面介绍两种常用方法

vi deploy-demo.yaml
kind: Deployment
metadata:name: myapp-v1
spec:replicas: 2selector:matchLabels:app: myappversion: v1template:metadata:labels:app: myappversion: v1spec:containers:- name: myappimage: 172.16.80.140/myapp/myapp:v1imagePullPolicy: IfNotPresentports:- containerPort: 80

第一种方法：修改yaml中replicas的值，应用该yaml，如replicas: 3

第二种方法：kubectl edit deploy myapp-v1，修改replicas: 4，保存查看

缩容和扩容一样操作