docker - kubernetes 无法拉取本地镜像

Question

我在单机上使用 kubernetes 进行测试，我已经从 nginx docker 镜像构建了一个自定义镜像，但是当我尝试在 kubernetes 中使用该镜像时，出现镜像拉取错误？？？？？？

我的 POD YAML

kind: Pod
apiVersion: v1
metadata:
  name: yumserver
  labels:
    name: frontendhttp
spec:
  containers:
    - name: myfrontend
      image: my/nginx:latest
      ports:
        - containerPort: 80
          name: "http-server"
      volumeMounts:
      - mountPath: "/usr/share/nginx/html"
        name: mypd
  imagePullSecrets:
    - name: myregistrykey

  volumes:
    - name: mypd
      persistentVolumeClaim:
       claimName: myclaim-1

我的 KUBERNETES 命令

kubectl create -f pod-yumserver.yaml

错误

kubectl describe pod yumserver


Name: yumserver
Namespace: default
Image(s):   my/nginx:latest
Node:       127.0.0.1/127.0.0.1
Start Time: Tue, 26 Apr 2016 16:31:42 +0100
Labels:     name=frontendhttp
Status:     Pending
Reason:     
Message:    
IP:     172.17.0.2
Controllers:    <none>
Containers:
  myfrontend:
    Container ID:   
    Image:      my/nginx:latest
    Image ID:       
    QoS Tier:
      memory:       BestEffort
      cpu:      BestEffort
    State:      Waiting
      Reason:       ErrImagePull
    Ready:      False
    Restart Count:  0
    Environment Variables:
Conditions:
  Type      Status
  Ready     False 
Volumes:
  mypd:
    Type:   PersistentVolumeClaim (a reference to a PersistentVolumeClaim in the same namespace)
    ClaimName:  myclaim-1
    ReadOnly:   false
  default-token-64w08:
    Type:   Secret (a secret that should populate this volume)
    SecretName: default-token-64w08
Events:
  FirstSeen LastSeen    Count   From            SubobjectPath           Type        Reason          Message
  --------- --------    -----   ----            -------------           --------    ------          -------
  13s       13s     1   {default-scheduler }                    Normal      Scheduled       Successfully assigned yumserver to 127.0.0.1
  13s       13s     1   {kubelet 127.0.0.1}                 Warning     MissingClusterDNS   kubelet does not have ClusterDNS IP configured and cannot create Pod using "ClusterFirst" policy. Falling back to DNSDefault policy.
  12s       12s     1   {kubelet 127.0.0.1} spec.containers{myfrontend} Normal      Pulling         pulling image "my/nginx:latest"
  8s        8s      1   {kubelet 127.0.0.1} spec.containers{myfrontend} Warning     Failed          Failed to pull image "my/nginx:latest": Error: image my/nginx:latest not found
  8s        8s      1   {kubelet 127.0.0.1}                 Warning     FailedSync      Error syncing pod, skipping: failed to "StartContainer" for "myfrontend" with ErrImagePull: "Error: image my/nginx:latest not found"

Answer 1

So you have the image on your machine aready. It still tries to pull the image from Docker Hub, however, which is likely not what you want on your single-machine setup. This is happening because the latest tag sets the imagePullPolicy to Always implicitly. You can try setting it to IfNotPresent explicitly or change to a tag other than latest. – Timo Reimann Apr 28 at 7:16

出于某种原因，Timo Reimann 只是在上面发布了这个作为评论，但它绝对应该是这个问题的官方答案，所以我再次发布它。