关于Kubernetes-v1.23.6-资源调度-Deployment-创建与配置文件解析

Deployment的创建

可以按如下的方式创建一个 nginx 的deployment

可以看出，deployment 下面的 replicaset，而replicaset(即rs)下面就是pod了

[root@k8s-master deployments]# kubectl create deploy nginx-deploy --image=nginx:1.7.9
deployment.apps/nginx-deploy created
[root@k8s-master deployments]# kubectl get deployments
NAME           READY   UP-TO-DATE   AVAILABLE   AGE
nginx-deploy   1/1     1            1           12s
[root@k8s-master deployments]# kubectl get deploy
NAME           READY   UP-TO-DATE   AVAILABLE   AGE
nginx-deploy   1/1     1            1           26s
[root@k8s-master deployments]# kubectl get replicaset
NAME                      DESIRED   CURRENT   READY   AGE
nginx-deploy-78d8bf4fd7   1         1         1       49s
[root@k8s-master deployments]# kubectl get rs
NAME                      DESIRED   CURRENT   READY   AGE
nginx-deploy-78d8bf4fd7   1         1         1       54s
[root@k8s-master deployments]# kubectl get po
NAME                            READY   STATUS    RESTARTS   AGE
nginx-deploy-78d8bf4fd7-s86tc   1/1     Running   0          61s
[root@k8s-master deployments]#

可以通过名称，看出层次与所属的关系

 

获取一个deployment的配置信息

[root@k8s-master deployments]# kubectl get  deploy nginx-deploy -o yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  annotations:
    deployment.kubernetes.io/revision: "1"
  creationTimestamp: "2023-09-17T11:22:31Z"
  generation: 1
  labels:
    app: nginx-deploy
  name: nginx-deploy
  namespace: default
  resourceVersion: "72556"
  uid: ed745961-c716-4913-963c-79a5b31a4675
spec:
  progressDeadlineSeconds: 600
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      app: nginx-deploy
  strategy:
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 25%
    type: RollingUpdate
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: nginx-deploy
    spec:
      containers:
      - image: nginx:1.7.9
        imagePullPolicy: IfNotPresent
        name: nginx
        resources: {}
        terminationMessagePath: /dev/termination-log
        terminationMessagePolicy: File
      dnsPolicy: ClusterFirst
      restartPolicy: Always
      schedulerName: default-scheduler
      securityContext: {}
      terminationGracePeriodSeconds: 30
status:
  availableReplicas: 1
  conditions:
  - lastTransitionTime: "2023-09-17T11:22:33Z"
    lastUpdateTime: "2023-09-17T11:22:33Z"
    message: Deployment has minimum availability.
    reason: MinimumReplicasAvailable
    status: "True"
    type: Available
  - lastTransitionTime: "2023-09-17T11:22:31Z"
    lastUpdateTime: "2023-09-17T11:22:33Z"
    message: ReplicaSet "nginx-deploy-78d8bf4fd7" has successfully progressed.
    reason: NewReplicaSetAvailable
    status: "True"
    type: Progressing
  observedGeneration: 1
  readyReplicas: 1
  replicas: 1
  updatedReplicas: 1
[root@k8s-master deployments]#

 

通过配置参考-编写自己的Deployment配置文件

只需要上面的status:之前的内容即可，创建nginx-deploy.yaml文件

删除一些不必要的，最终留下如下的信息即可

[root@k8s-master deployments]# cat nginx-deploy.yaml
apiVersion: apps/v1    # deployment api 版本
kind: Deployment       # 资源类型为 deployment
metadata:              # 元信息
  labels:              # 标签
    app: nginx-deploy  # 具体的key: value 配置形式
  name: nginx-deploy   # deployment 的名字
  namespace: default   # 所在的命名空间
spec:
  replicas: 1          # 指定副本数量,最少要有一个
  revisionHistoryLimit: 10   # 进行滚动更新后，保留的历史版本数
  selector:                  # 选择器，用于找到匹配的RS
    matchLabels:             # 按照标签匹配
      app: nginx-deploy      # 匹配的标签 key: value
  strategy:                  # 更新策略
    rollingUpdate:           # 滚动更新配置
      maxSurge: 25%          # 进行滚动更新时，更新的个数最多可以超过期望副本数的个数/比例
      maxUnavailable: 25%    # 进行滚动更新时，最大不可用比例更新比例，表示在所有副本数中，最多可以有多少个不更新成功
    type: RollingUpdate      # 更新类型，采用滚动更新
  template:                 # 描述我们的Pod该如何创建，Pod 模板
    metadata:               # Pod 的元信息
      labels:               # Pod 的标签
        app: nginx-deploy   #
    spec:                   # Pod 期望信息
      containers:           # Pod 的容器
      - image: nginx:1.7.9  # 镜像
        imagePullPolicy: IfNotPresent    # 拉取策略
        name: nginx                      # 容器名称
      restartPolicy: Always              # 重启策略
      terminationGracePeriodSeconds: 30  # 删除操作最多宽限多长时间

这里我们只是创建出来，先暂时不使用，如果以后需要通过deployment配置文件进行相关资源的创建，可以使用命令：kubectl create -f nginx-deploy.yaml

 

扩展-删除Deployment-rs-pod资源

先进行查询

[root@k8s-master deployments]# kubectl get po,rs,deploy
NAME                                READY   STATUS    RESTARTS   AGE
pod/nginx-deploy-78d8bf4fd7-s86tc   1/1     Running   0          51m

NAME                                      DESIRED   CURRENT   READY   AGE
replicaset.apps/nginx-deploy-78d8bf4fd7   1         1         1       51m

NAME                           READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/nginx-deploy   1/1     1            1           51m
[root@k8s-master deployments]# kubectl get po,rs,deploy --show-labels
NAME                                READY   STATUS    RESTARTS   AGE   LABELS
pod/nginx-deploy-78d8bf4fd7-s86tc   1/1     Running   0          52m   app=nginx-deploy,pod-template-hash=78d8bf4fd7

NAME                                      DESIRED   CURRENT   READY   AGE   LABELS
replicaset.apps/nginx-deploy-78d8bf4fd7   1         1         1       52m   app=nginx-deploy,pod-template-hash=78d8bf4fd7

NAME                           READY   UP-TO-DATE   AVAILABLE   AGE   LABELS
deployment.apps/nginx-deploy   1/1     1            1           52m   app=nginx-deploy
[root@k8s-master deployments]#

删除操作：kubectl delete deployment nginx-deploy

这样最上面创建的nginx-deploy这个deployment资源，以及相关的rs和pod资源就都被删除了

 

 

 

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