56 lines
1.1 KiB
Markdown
56 lines
1.1 KiB
Markdown
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---
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title: "Deployment"
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---
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Deployment为Pod和ReplicaSet提供了一个声明式定义(declarative)方法，用来替代以前的ReplicationController来方便的管理应用。典型的应用场景包括：
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- 定义Deployment来创建Pod和ReplicaSet
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- 滚动升级和回滚应用
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- 扩容和缩容
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- 暂停和继续Deployment
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比如一个简单的nginx应用可以定义为
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```yaml
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apiVersion: extensions/v1beta1
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kind: Deployment
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metadata:
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name: nginx-deployment
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spec:
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replicas: 3
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template:
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metadata:
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labels:
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app: nginx
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spec:
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containers:
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- name: nginx
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image: nginx:1.7.9
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ports:
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- containerPort: 80
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```
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扩容：
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```
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kubectl scale deployment nginx-deployment --replicas 10
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```
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如果集群支持 horizontal pod autoscaling 的话，还可以为Deployment设置自动扩展：
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```
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kubectl autoscale deployment nginx-deployment --min=10 --max=15 --cpu-percent=80
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```
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更新镜像也比较简单:
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```
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kubectl set image deployment/nginx-deployment nginx=nginx:1.9.1
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```
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回滚：
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```
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kubectl rollout undo deployment/nginx-deployment
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```
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