kubernetes - Secret doesn't work properly under REHL7.8 when pod pulling from docker-hub private repo

Question

What happened: I setting up the secret (which works in ubuntu18.04 cluster) in my Kubernetes cluster (os: REHL7.8) and when trying to create a pod pulling from one of my docker hub private repo. Following is my command for creating secret:

kubectl create secret docker-registry regcred 
  --docker-server=index.docker.io 
  --docker-username=my-username 
  --docker-password=my-password 
  --docker-email=my-email

Here is the yaml file I use for creating pod:

apiVersion: v1
kind: Pod
metadata:
  name: test-reg
spec:
  containers:
  - name: test-reg-container
    image: docker.io/memo40k/test:v1
  imagePullSecrets:
  - name: regcred

And I always got the following response when creating the pod:

Events:
  Type     Reason     Age        From               Message
  ----     ------     ----       ----               -------
  Normal   Scheduled  13s        default-scheduler  Successfully assigned default/test-reg to wistron-4
  Normal   Pulling    0s         kubelet            Pulling image "docker.io/repo-name/test:v1"
  Warning  Failed     <invalid>  kubelet            Failed to pull image "docker.io/repo-name/test:v1": rpc error: code = Unknown desc = repository docker.io/memo40k/test not found: does not exist or no pull access
  Warning  Failed     <invalid>  kubelet            Error: ErrImagePull
  Normal   BackOff    <invalid>  kubelet            Back-off pulling image "docker.io/repo-name/test:v1"
  Warning  Failed     <invalid>  kubelet            Error: ImagePullBackOff

I also tried direct docker pull target image after docker login, and it works fine.

What you expected to happen: Pod should be able to pull image from docker-hub private repo

How to reproduce it (as minimally and precisely as possible): Build a one node k8s cluster with RHEL 7.8 and trying to create pod using private repo image

Anything else we need to know?:

Environment:

• Kubernetes version (use kubectl version): v1.18.9
• Cloud provider or hardware configuration:
• OS (e.g: cat /etc/os-release): RHEL 7.8
• Kernel (e.g. uname -a): 3.10.0-1127.el7.x86_64
• Install tools: kubeadm
• Network plugin and version (if this is a network-related bug): flannel v0.13.1

Thanks in advance for your great help.

Answer 1

等待大神答复