Integrate your Google GCR (Google container registry) with Polyaxon to start your machine learning and deep learning experiments on Kubernetes.


You can use your public images without the need to set any configuration. In order to push private docker images to GCR, you need to set access credentials.

Enable Container Registry API

Start with enabling the Container Registry API by logging into Google Cloud and navigating to Container Registry on your project.

Create a service account on GCS with storage admin role

  1. Go to
  2. Make sure your project is selected
  3. Click <top-left menu w/ three horizontal bars> -> IAM & Admin -> Service Accounts menu option
  4. Click Create service account
  5. Give your account a descriptive name such as “polyaxon-gcr-access”
  6. Click Role -> Storage -> Storage Admin menu option
  7. Click Create Key
  8. Leave key type as default of JSON
  9. Click Create

Create a secret containing the credentials to use with GCR

In order to create a valid secret using the service account key, you need to create base64 auth based on the _json_key and value in json.json.

So using python you can do:

import base64
base64.b64encode('_json_key:{"type": "service_account", "project_id": "my_project", "private_key_id": "ajshvasjhqweqetquytqut17253871238", "private_key": "-----BEGIN PRIVATE KEY-----\nASBHJASJDASBDJAJHSBDJB/sfbdj1223"}'.encode())

> b'anNvbl9rZXk6eyJ0eXBlIjogInNlcnZpY2VfYWNjb3VudCIsICJwcm9qZWN0X2lkIjogIm15X3Byb2plY3QiLCAicHJpdmF0ZV9rZXlfaWQiOiAiYWpzaHZhc2pocXdlcWV0cXV5dHF1dDE3MjUzODcxMjM4IiwgInByaXZhdGVfa2V5IjogIi0tLS0tQkVHSU4gUFJJVkFURSBLRVktLS0tLQpBU0JISkFTSkRBU0JESkFKSFNCREpCL3NmYmRqMTIyMyJ9+'

Create an auths config file

    "auths": {
        "": {
            "auth": "anNvbl9rZXk6eyJ0eXBlIjogInNlcnZpY2VfYWNjb3VudCIsICJwcm9qZWN0X2lkIjogIm15X3Byb2plY3QiLCAicHJpdmF0ZV9rZXlfaWQiOiAiYWpzaHZhc2pocXdlcWV0cXV5dHF1dDE3MjUzODcxMjM4IiwgInByaXZhdGVfa2V5IjogIi0tLS0tQkVHSU4gUFJJVkFURSBLRVktLS0tLQpBU0JISkFTSkRBU0JESkFKSFNCREpCL3NmYmRqMTIyMyJ9="

You may need to update gcr.iokey to your repository hosts,, or if you are using not default one.

Create a secret with config.json as a name

kubectl create secret generic docker-conf --from-file=config.json=./config.json -n polyaxon

Add the secret to the connections catalog

If you are using Kaniko

  - name: docker-connection
    kind: registry
      url: destination
      name: docker-conf
      mountPath: /kaniko/.docker

If you are using dockerizer using the default root user:

  - name: docker-connection-dockerizer
    kind: registry
      url: destination
      name: docker-conf
      mountPath: /root/.docker