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title: Deployment # 簡報的名稱
tags: K8s # 簡報的標籤

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# Deployment

> [name=李俊毅]
> [time=Wed, Feb 5, 2020 1:04 PM]

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## Agenda

* 介紹
* 範例
* Deployment與Pod的關係
* 常用的CLI

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## 介紹

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Deployment，可縮寫為Deploy，管理無狀態應用，可以配置Pod在哪個Node上與管理Pod擴展和伸縮，Pod Name為無序命名，命名規則為 Pod Name-加上 UID

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## 範例

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hello-world.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app.kubernetes.io/name: load-balancer-example
  name: hello-world
spec:
  replicas: 5
  selector:
    matchLabels:
      app.kubernetes.io/name: load-balancer-example
  template:
    metadata:
      labels:
        app.kubernetes.io/name: load-balancer-example
    spec:
      containers:
      - image: gcr.io/google-samples/node-hello:1.0
        name: hello-world
        ports:
        - containerPort: 8080

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## Deployment 與 Pod 的關係

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Deployment 是透過 ReplicaSet 控制 Pod ，可以從 describe deploy 上看到


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## 常用的CLI

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### 查詢 deployment

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kubectl get deploy


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### 確認 deployment 狀況

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kubectl describe deploy hello-world


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### 查看或修改運行中 deployment

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kubectl edit deploy hello-world


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### 查看 Pod

kubectl get pods -o wide

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