如何解决本地ImagePullBackOff错误？

Question

Net Core 应用程序映像，我正在尝试在本地 kubernetes 中创建部署。我创建了 docker 镜像，如下所示。

docker tag microservicestest:dev microservicestest .
docker build -t microservicestest .
docker run -d -p 8080:80 --name myapp microservicetest

然后我创建了部署，如下所示。

kubectl run microservicestest-deployment --image=microservicestest:latest --port 80 --replicas=3
kubectl expose deployment microservicestest-deployment --type=NodePort

然后当我看到 Kubectl get pods 时，我看到以下错误

以下是我运行 docker images 时的输出

下面是输出

apiVersion: apps/v1
kind: Deployment
metadata:
  annotations:
    deployment.kubernetes.io/revision: "1"
  creationTimestamp: "2020-09-22T04:29:14Z"
  generation: 1
  labels:
    run: microservicestest-deployment
  name: microservicestest-deployment
  namespace: default
  resourceVersion: "17282"
  selfLink: /apis/apps/v1/namespaces/default/deployments/microservicestest-deployment
  uid: bf75410a-d332-4016-9757-50d534114599
spec:
  progressDeadlineSeconds: 600
  replicas: 3
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      run: microservicestest-deployment
  strategy:
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 25%
    type: RollingUpdate
  template:
    metadata:
      creationTimestamp: null
      labels:
        run: microservicestest-deployment
    spec:
      containers:
      - image: microservicestest:latest
        imagePullPolicy: Always
        name: microservicestest-deployment
        ports:
        - containerPort: 80
          protocol: TCP
        resources: {}
        terminationMessagePath: /dev/termination-log
        terminationMessagePolicy: File
      dnsPolicy: ClusterFirst
      restartPolicy: Always
      schedulerName: default-scheduler
      securityContext: {}
      terminationGracePeriodSeconds: 30
status:
  conditions:
  - lastTransitionTime: "2020-09-22T04:29:14Z"
    lastUpdateTime: "2020-09-22T04:29:14Z"
    message: Deployment does not have minimum availability.
    reason: MinimumReplicasUnavailable
    status: "False"
    type: Available
  - lastTransitionTime: "2020-09-22T04:29:14Z"
    lastUpdateTime: "2020-09-22T04:29:14Z"
    message: ReplicaSet "microservicestest-deployment-5c67d587b9" is progressing.
    reason: ReplicaSetUpdated
    status: "True"
    type: Progressing
  observedGeneration: 1
  replicas: 3
  unavailableReplicas: 3
  updatedReplicas: 3

我无法理解为什么我的 Pod 无法从本地提取图像。有人可以帮助我确定我在这里所做的问题吗？任何帮助，将不胜感激。谢谢

Answer 1

如果您使用的是 minikube，您首先需要在 minikube 机器托管的 docker 中构建映像，在 Windows 的 bash 会话中执行此操作，请eval $(minikube docker-env)检查此处

那么你需要告诉 Kubernetes 你的镜像拉取策略为 Never 或 IfNotPresent 来查找本地镜像

spec:
     containers:
     - image: my-image:my-tag
       name: my-app
       imagePullPolicy: Never

在这里查看官方文档

By default, the kubelet tries to pull each image from the specified registry. However, if the imagePullPolicy property of the container is set to IfNotPresent or Never, then a local image is used (preferentially or exclusively, respectively).

由于您没有使用 yaml 文件，因此您可以像这样创建资源

kubectl run microservicestest-deployment --image=microservicestest:latest --image-pull-policy=Never --port 80 --replicas=3

kubectl expose deployment microservicestest-deployment --type=NodePort