kubernetes进阶之路（三）~~~Controller系列之Deployment

官网：https://kubernetes.io/docs/concepts/workloads/controllers/deployment/

A Deployment provides declarative updates for Pods and ReplicaSets.

You describe a desired state in a Deployment, and the Deployment Controller changes the actual state to the desired state at a controlled rate. You can define Deployments to create new ReplicaSets, or to remove existing Deployments and adopt all their resources with new Deployments.

Deployment相对RC最大的一个升级就是我们可以随时知道当前Pod“部署”的进度。
创建一个Deployment对象来生成对应的Replica Set并完成Pod副本的创建过程
检查Deploymnet的状态来看部署动作是否完成（Pod副本的数量是否达到预期的值）

Deploymnet与Replica Set架构图如下：
在这里插入图片描述
下面做一个实际的例子：

(1)创建nginx_deployment.yaml文件

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.7.9
        ports:
        - containerPort: 80

(2)根据nginx_deployment.yaml文件创建pod

kubectl apply -f nginx_deployment.yaml

(3)查看pod

#查看pod的详细信息
[root@henry001 ~]# kubectl get pods -o wide
NAME                               READY   STATUS    RESTARTS   AGE   IP                NODE       NOMINATED NODE   READINESS GATES
nginx-deployment-6dd86d77d-7kwn5   1/1     Running   0          65s   192.168.217.8     henry002   <none>           <none>
nginx-deployment-6dd86d77d-dbghj   1/1     Running   0          65s   192.168.254.200   henry003   <none>           <none>
nginx-deployment-6dd86d77d-jv8zm   1/1     Running   0          65s   192.168.217.9     henry002   <none>           <none>

#查看deployment
[root@henry001 ~]# kubectl get deployment
NAME               READY   UP-TO-DATE   AVAILABLE   AGE
nginx-deployment   3/3     3            3           79s

#查看replicaSet
[root@henry001 ~]# kubectl get rs
NAME                         DESIRED   CURRENT   READY   AGE
nginx-deployment-6dd86d77d   3         3         3       86s

nginx-deployment-6dd86d77d-f7dxb   1/1     Running   0      22s   192.168.80.198   w2 
nginx-deployment-6dd86d77d-npqxj   1/1     Running   0      22s   192.168.190.71   w1 
nginx-deployment-6dd86d77d-swt25   1/1     Running   0      22s   192.168.190.70   w1

(4)查看当前nginx的版本

#查看deployment的详细信息
[root@henry001 ~]# kubectl get deployment -o wide
NAME               READY   UP-TO-DATE   AVAILABLE   AGE   CONTAINERS   IMAGES        SELECTOR
nginx-deployment   3/3     3            3           97s   nginx        nginx:1.7.9   app=nginx

(5)更新nginx的image版本

#升级nginx的镜像 1.7.9————>1.9.1
[root@henry001 ~]# kubectl set image deployment nginx-deployment nginx=nginx:1.9.1
deployment.extensions/nginx-deployment image updated

#查看deployment，发现镜像已经更新为1.9.1
[root@henry001 ~]# kubectl get deployment -o wide
NAME               READY   UP-TO-DATE   AVAILABLE   AGE   CONTAINERS   IMAGES        SELECTOR
nginx-deployment   3/3     1            3           10m   nginx        nginx:1.9.1   app=nginx

对于镜像更新有一些方法：

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将deployment中的nginx容器镜像设置为“nginx：1.9.1”。

kubectl set image deployment/nginx busybox=busybox nginx=nginx:1.9.1

所有deployment和rc的nginx容器镜像更新为“nginx：1.9.1”

kubectl set image deployments,rc nginx=nginx:1.9.1 --all

将daemonset abc的所有容器镜像更新为“nginx：1.9.1”

kubectl set image daemonset abc *=nginx:1.9.1

从本地文件中更新nginx容器镜像

kubectl set image -f path/to/file.yaml nginx=nginx:1.9.1 --local -o yaml

henry_2016

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kubernetes进阶之路（三）~~~Controller系列之Deployment

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