k8s学习(六)Deployment的使用

目录前言一、chang二、使用步骤1.引入库2.读入数据总结前言Deployment 为 Pod 和 ReplicaSet 提供了一个声明式定义。一、chang二、使用步骤1.引入库代码如下（示例）：import numpy as npimport pandas as pdimport matplotlib.pyplot as pltimport seaborn as snsimport warn

_lrs

799人浏览 · 2021-12-22 21:45:43

_lrs · 2021-12-22 21:45:43 发布

前言

Deployment 为 Pod 和 ReplicaSet 提供了一个声明式定义。

一、创建

（1）nginx-deployment.yaml

[root@k8s-master k8s]# cat nginx-deployment.yaml 
apiVersion: apps/v1 
kind: Deployment 
metadata: 
  name: nginx-deployment 
spec: 
  replicas: 3 
  selector:
    matchLabels:
      app: nginx-deployment-test
  template: 
    metadata: 
      labels: 
        app: nginx-deployment-test 
    spec: 
      containers: 
      - name: nginx-deployment-test
        image: nginx:1.20
        ports: 
        - containerPort: 80

（2）查询 deployment

[root@k8s-master k8s]# kubectl get deployments
NAME               READY   UP-TO-DATE   AVAILABLE   AGE
nginx-deployment   3/3     3            3           45s

NAME 列出了集群中 Deployment 的名称。

READY 显示应用程序的可用的副本数。显示的模式是“就绪个数/期望个数”。

UP-TO-DATE 显示为了达到期望状态已经更新的副本数。

AVAILABLE 显示应用可供用户使用的副本数。

AGE 显示应用程序运行的时间。

（3）查看状态

[root@k8s-master k8s]# kubectl rollout status deployment/nginx-deployment
deployment "nginx-deployment" successfully rolled out

（4）查询ReplicaSet

[root@k8s-master k8s]# kubectl get rs
NAME                          DESIRED   CURRENT   READY   AGE
nginx-deployment-5bf86c7b68   3         3         3       51s

NAME 列出名字空间中 ReplicaSet 的名称；

DESIRED 显示应用的期望副本个数，即在创建 Deployment 时所定义的值。此为期望状态；

CURRENT 显示当前运行状态中的副本个数；

READY 显示应用中有多少副本可以为用户提供服务；

AGE 显示应用已经运行的时间长度。

（5）查询pod

[root@k8s-master k8s]# kubectl get pods
NAME                                READY   STATUS    RESTARTS   AGE
nginx-deployment-5bf86c7b68-hl7rr   1/1     Running   0          56s
nginx-deployment-5bf86c7b68-l8pvb   1/1     Running   0          56s
nginx-deployment-5bf86c7b68-wrnff   1/1     Running   0          56s

二、扩容

（1）scale

[root@k8s-master k8s]# kubectl scale deployment nginx-deployment --replicas 5
deployment.apps/nginx-deployment scaled

[root@k8s-master k8s]# kubectl get deployments
NAME               READY   UP-TO-DATE   AVAILABLE   AGE
nginx-deployment   5/5     5            5           14m

（2）autoscale

[root@k8s-master k8s]# kubectl autoscale deployment nginx-deployment --min=6 --max=10 --cpu-percent=80
horizontalpodautoscaler.autoscaling/nginx-deployment autoscaled

[root@k8s-master k8s]# kubectl get deployments
NAME               READY   UP-TO-DATE   AVAILABLE   AGE
nginx-deployment   5/6     6            5           16m
[root@k8s-master k8s]# kubectl get deployments
NAME               READY   UP-TO-DATE   AVAILABLE   AGE
nginx-deployment   6/6     6            6           16m

三、更新、回退

1、从1.20 更新至 1.20.1

[root@k8s-master k8s]# kubectl set image deployment/nginx-deployment nginx-deployment-test=nginx:1.20.1
deployment.apps/nginx-deployment image updated

创建了新的ReplicaSet

[root@k8s-master k8s]# kubectl get rs
NAME                          DESIRED   CURRENT   READY   AGE
nginx-deployment-5878549b9c   6         6         6       43s
nginx-deployment-5bf86c7b68   0         0         0       22m

2、 kubectl describe deployments 查看deployment详细信息

Events:
  Type    Reason             Age                From                   Message
  ----    ------             ----               ----                   -------
  Normal  ScalingReplicaSet  27m                deployment-controller  Scaled up replica set nginx-deployment-5bf86c7b68 to 3
  Normal  ScalingReplicaSet  13m                deployment-controller  Scaled up replica set nginx-deployment-5bf86c7b68 to 5
  Normal  ScalingReplicaSet  10m                deployment-controller  Scaled up replica set nginx-deployment-5bf86c7b68 to 6
  Normal  ScalingReplicaSet  5m27s              deployment-controller  Scaled up replica set nginx-deployment-5878549b9c to 2
  Normal  ScalingReplicaSet  5m27s              deployment-controller  Scaled down replica set nginx-deployment-5bf86c7b68 to 5
  Normal  ScalingReplicaSet  5m27s              deployment-controller  Scaled up replica set nginx-deployment-5878549b9c to 3
  Normal  ScalingReplicaSet  5m6s               deployment-controller  Scaled down replica set nginx-deployment-5bf86c7b68 to 4
  Normal  ScalingReplicaSet  5m6s               deployment-controller  Scaled up replica set nginx-deployment-5878549b9c to 4
  Normal  ScalingReplicaSet  5m4s               deployment-controller  Scaled down replica set nginx-deployment-5bf86c7b68 to 3
  Normal  ScalingReplicaSet  5m4s               deployment-controller  Scaled up replica set nginx-deployment-5878549b9c to 5
  Normal  ScalingReplicaSet  5m (x4 over 5m2s)  deployment-controller  (combined from similar events): Scaled down replica set nginx-deployment-5bf86c7b68 to 0

3、从1.20.1 更新至 1.20.2

[root@k8s-master k8s]# kubectl set image deployment/nginx-deployment nginx-deployment-test=nginx:1.20.2
deployment.apps/nginx-deployment image updated

4、查看升级历史记录

[root@k8s-master k8s]# kubectl rollout history deployment/nginx-deployment
deployment.apps/nginx-deployment 
REVISION  CHANGE-CAUSE
1         <none>
2         <none>
3         <none>

5、查看第2个版本

[root@k8s-master k8s]#  kubectl rollout history deployment/nginx-deployment --revision=2
deployment.apps/nginx-deployment with revision #2
Pod Template:
  Labels:	app=nginx-deployment-test
	pod-template-hash=5878549b9c
  Containers:
   nginx-deployment-test:
    Image:	nginx:1.20.1
    Port:	80/TCP
    Host Port:	0/TCP
    Environment:	<none>
    Mounts:	<none>
  Volumes:	<none>

6、回退到第一个版本

[root@k8s-master k8s]# kubectl rollout undo deployment/nginx-deployment
deployment.apps/nginx-deployment rolled back

查看当前版本

[root@k8s-master k8s]# kubectl rollout history deployment/nginx-deployment
deployment.apps/nginx-deployment 
REVISION  CHANGE-CAUSE
1         <none>
3         <none>
4         <none>

[root@k8s-master k8s]# kubectl rollout history deployment/nginx-deployment --revision=4
deployment.apps/nginx-deployment with revision #4
Pod Template:
  Labels:	app=nginx-deployment-test
	pod-template-hash=5878549b9c
  Containers:
   nginx-deployment-test:
    Image:	nginx:1.20.1
    Port:	80/TCP
    Host Port:	0/TCP
    Environment:	<none>
    Mounts:	<none>
  Volumes:	<none>

7、回退到指定版本

[root@k8s-master k8s]# kubectl rollout undo deployment/nginx-deployment --to-revision=1
deployment.apps/nginx-deployment rolled back

查看当前版本

[root@k8s-master k8s]# kubectl rollout history deployment/nginx-deployment
deployment.apps/nginx-deployment 
REVISION  CHANGE-CAUSE
3         <none>
4         <none>
5         <none>

[root@k8s-master k8s]# kubectl rollout history deployment/nginx-deployment --revision=5
deployment.apps/nginx-deployment with revision #5
Pod Template:
  Labels:	app=nginx-deployment-test
	pod-template-hash=5bf86c7b68
  Containers:
   nginx-deployment-test:
    Image:	nginx:1.20
    Port:	80/TCP
    Host Port:	0/TCP
    Environment:	<none>
    Mounts:	<none>
  Volumes:	<none>

四、暂停、恢复

1、暂停

[root@k8s-master k8s]#  kubectl rollout pause deployment/nginx-deployment
deployment.apps/nginx-deployment paused

2、恢复

kubectl rollout resume deploy nginx-deployment

五、状态

1、progressing

Deployment 正在创建新的 ReplicaSet 过程中；

Deployment 正在扩容一个已有的 ReplicaSet；

Deployment 正在缩容一个已有的 ReplicaSet；

有新的可用的 pod 出现。

2、Complete

Deployment 最小可用。最小可用意味着 Deployment 的可用 replica 个数等于或者超过 Deployment 策略中的期望个数。

所有与该 Deployment 相关的 replica 都被更新到了你指定版本，也就说更新完成。

该 Deployment 中没有旧的 Pod 存在。

3、Failed

这可能是因为以下几个因素引起的：

无效的引用

不可读的 probe failure

镜像拉取错误

权限不够

范围限制

程序运行时配置错误

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