Kubernetes部署因映像拉拔失败而失败

Question

While trying to deploy my custom nginx image from local registry to kubernetes , I am seeing below error in kubernetes-dashboard -

Failed to pull image "myapp": rpc error: code = Unknown desc = Error response from daemon: repository myapp not found: does not exist or no pull access

This is the steps I followed -

1) Built my customer image using docker
2) kubectl run myapp --image=myapp --port=80 --image-pull-policy=IfNotPresent
3) kubectl expose deployment myapp --type=LoadBalancer --port=80 --target-port=80 --name=myapp

In Kubernetes-dashboard, I see deployment showing failure due to above error of repository myapp not found.

I even tried to add this steps mentioned in https://kubernetes.io/docs/tasks/configure-pod-container/pull-image-private-registry/

docker login
kubectl create secret docker-registry regcred --docker-server=https://index.docker.io/v1/ --docker-username=xxx --docker-password=xxx --docker-email=xxx

But still same issue.

What should I do for pod to get my local repo in GKE. Appreciate any help. Thanks.

Here is the more info as requested by rjdkolb -

xxx@cloudshell:~ (involuted-ratio-227118)$ kubectl describe pod myapp-7cf96cf48-vsqb5
Name:           myapp-7cf96cf48-vsqb5
Namespace:      default
Node:           gke-standard-cluster-1-default-pool-c7d671ed-br8j/10.142.0.3
Start Time:     Wed, 09 Jan 2019 22:28:58 +0530
Labels:         pod-template-hash=379527904
                run=myapp
Annotations:    kubernetes.io/limit-ranger=LimitRanger plugin set: cpu request for container myapp
Status:         Pending
IP:             10.48.8.9
Controlled By:  ReplicaSet/myapp-7cf96cf48
Containers:
  myapp:
    Container ID:
    Image:          mynginx
    Image ID:
    Port:           80/TCP
    Host Port:      0/TCP
    State:          Waiting
      Reason:       ImagePullBackOff
    Ready:          False
    Restart Count:  0
    Requests:
      cpu:        100m
    Environment:  <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-8p622 (ro)
Conditions:
  Type           Status
  Initialized    True
  Ready          False
  PodScheduled   True
Volumes:
  default-token-8p622:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-8p622
    Optional:    false
QoS Class:       Burstable
Node-Selectors:  <none>
Tolerations:     node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:
  Type     Reason                 Age              From                                                        Message
  ----     ------                 ----             ----                                                        -------
  Normal   Scheduled              4m               default-scheduler                                           Successfully assigned myapp-7cf96cf48-vsqb5 to gke-standard-cluster-1-default-pool-c7d671ed-br8j
  Normal   SuccessfulMountVolume  4m               kubelet, gke-standard-cluster-1-default-pool-c7d671ed-br8j  MountVolume.SetUp succeeded for volume "default-token-8p622"
  Normal   Pulling                2m (x4 over 4m)  kubelet, gke-standard-cluster-1-default-pool-c7d671ed-br8j  pulling image "mynginx"
  Warning  Failed                 2m (x4 over 4m)  kubelet, gke-standard-cluster-1-default-pool-c7d671ed-br8j  Failed to pull image "mynginx": rpc error: code = Unknown desc = Error response from daemon: repository mynginx not found: does not exist or no pull access
  Warning  Failed                 2m (x4 over 4m)  kubelet, gke-standard-cluster-1-default-pool-c7d671ed-br8j  Error: ErrImagePull
  Normal   BackOff                2m (x6 over 4m)  kubelet, gke-standard-cluster-1-default-pool-c7d671ed-br8j  Back-off pulling image "mynginx"
  Warning  Failed                 2m (x6 over 4m)  kubelet, gke-standard-cluster-1-default-pool-c7d671ed-br8j  Error: ImagePullBackOff

Answer 1

The issue here is your pod is going on the worker node and worker node doesn't have mynginx image present.

You need to copy the mynginx image from master node to worker node as follows:

Run following command on master node:

docker save -o <path for generated tar file> mynginx

Now copy the generated tar file to the worker node and load that image using following command:

docker load -i <path to image tar file>

This will load the mynginx image on your worker node and it will resolve your issue