How to pull image from dockerhub in kubernetes?

Question

I am planning to deploy an application in my kubernetes-clustering infra. I pushed image to dockerhub repo. How can I pull image from dockerhub?

Answer 1

Kubernetes run docker pull pseudo/your-image:latest under the hood. image field in Kubernetes resources is simply the docker image to run.

spec:
  containers:
  - name: app
    image: pseudo/your-image:latest
[...]

As the docker image name contains no specific docker registry url, the default is docker.io. Your image is in fact docker.io/pseudo/your-image:latest

If your image is hosted in a private docker hub repo, you need to specify an image pull secret in the spec field.

spec:
  containers:
  - name: app
    image: pseudo/your-image:latest
  imagePullSecrets:
  - name: dockerhub-credential

Here is the documentation to create the secret containing your docker hub login: https://kubernetes.io/docs/tasks/configure-pod-container/pull-image-private-registry/