|NO.Z.00014|——————————|CloudNative|——|Kubernetes&pod操作.V02|——|Deployment部署应用|

一、kubernetes核心技术-Controller控制器：controller流程概述

二、使用deployment部署应用（yaml）

### --- 使用deployment部署应用（yaml）
~~~		就可以部署，但是只能做测试环境
[root@k8s-master ~]# kubectl create deployment web --image=nginx
 
~~~		生成yaml文件
[root@k8s-master ~]# kubectl create deployment web --image=nginx --dry-run -o yaml

 

~~~		生成yaml文件并导出

[root@k8s-master ~]# kubectl create deployment web --image=nginx --dry-run -o yaml > web.yaml
[root@k8s-master ~]# vim web.yaml 
spec:                           						  # 通过这两条做匹配，selector和labels标签来做匹配            
  replicas: 1
  selector:
    matchLabels:
      app: web
  strategy: {}
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: web

### --- 通过yaml文件进行部署
[root@k8s-master ~]# kubectl apply -f web.yaml
deployment.apps/web configured
 
~~~		查看部署的应用
[root@k8s-master ~]# kubectl get pods 

### --- 对外发布部署

[root@k8s-master ~]# kubectl expose deployment web --port=80 --type=NodePort --target-port=80 --name=web1 -o yaml > web1.yaml

### --- 部署
### --- 通过浏览器来访问验证部署是否验证成功。

[root@k8s-master ~]# kubectl apply -f web1.yaml 
[root@k8s-master ~]# kubectl get pods,svc

三、应用升级回滚和弹性伸缩

### --- 应用升级回滚和弹性伸缩
~~~		指定nginx版本

[root@k8s-master ~]# vim web.yaml
    spec:
      containers:
      - image: nginx:1.14                           			 # 指定为1.14的版本
[root@k8s-master ~]# kubectl apply -f web.yaml 
deployment.apps/web configured
[root@k8s-master ~]# kubectl get pods
web-66bf4959f5-dh6dm    0/1     ContainerCreating   0          23s

### --- 升级nginx到1.15版本
[root@k8s-master ~]# kubectl set image deployment web nginx=nginx:1.15
deployment.apps/web image updated
 
~~~		再做升级的操作
[root@k8s-master ~]# kubectl get pods
NAME                    READY   STATUS              RESTARTS   AGE
nginx-f89759699-4msbd   1/1     Running             0          16m
web-66bf4959f5-dh6dm    1/1     Running             0          3m34s
web-bbcf684cb-cj274     0/1     ContainerCreating   0          4s

~~~		node节点可以看到镜像的版本1.15下载成功
[root@k8s-node1 ~]# docker images
nginx       1.15                53f3fd8007f7        21 months ago       109MB
 
~~~		查看升级后的状态：显示successfully是成功的
[root@k8s-master ~]# kubectl rollout status deployment web
deployment "web" successfully rolled out

### --- 把nginx1.15回滚到nginx1.14版本

[root@k8s-master ~]# kubectl rollout history  deployment web
deployment.apps/web 
REVISION  CHANGE-CAUSE
1         <none>
2         <none>                                                # nginx1.14版本
3         <none>                                                # 当前的版本：1.15版本

~~~		回滚到上一个版本
[root@k8s-master ~]# kubectl rollout undo  deployment web
deployment.apps/web rolled back
 
~~~		查看回滚的状态
[root@k8s-master ~]# kubectl rollout status deployment web
Waiting for deployment "web" rollout to finish: 1 old replicas are pending termination...
Waiting for deployment "web" rollout to finish: 1 old replicas are pending termination...
deployment "web" successfully rolled out 

### --- 把nginx1.14回滚到指定的版本
~~~		回滚到第三个版本

[root@k8s-master ~]# kubectl rollout undo  deployment web --to-revision=3
deployment.apps/web rolled back                              
[root@k8s-master ~]# kubectl rollout status deployment web
Waiting for deployment "web" rollout to finish: 1 old replicas are pending termination...
Waiting for deployment "web" rollout to finish: 1 old replicas are pending termination...
deployment "web" successfully rolled out

### --- 弹性伸缩

[root@k8s-master ~]# kubectl get pods
NAME                    READY   STATUS    RESTARTS   AGE
nginx-f89759699-4msbd   1/1     Running   0          28m
web-bbcf684cb-w894j     1/1     Running   0          2m20s

~~~		创建10个pod

[root@k8s-master ~]# kubectl scale deployment web --replicas=10
deployment.apps/web scaled
[root@k8s-master ~]# kubectl get pods
NAME                    READY   STATUS             RESTARTS   AGE
nginx-f89759699-4msbd   1/1     Running            0          31m
web-bbcf684cb-2g2wr     1/1     Running            0          2m54s
web-bbcf684cb-672j9     1/1     Running            0          2m54s
web-bbcf684cb-bjbrj     1/1     Running            0          2m54s
web-bbcf684cb-ctpv2     1/1     Running            0          2m54s
web-bbcf684cb-hr8j5     1/1     Running            0          2m54s
web-bbcf684cb-jbm8l     1/1     Running            0          2m54s
web-bbcf684cb-rn4pt     1/1     Running            0          2m54s
web-bbcf684cb-vr2pb     1/1     Running            0          2m54s
web-bbcf684cb-w894j     1/1     Running            0          5m50s
web-bbcf684cb-xgdfq     0/1     Running            0          2m54s

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Walter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart

                                                                                                                                                   ——W.S.Landor

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