Using Images from Other Projects

This page describes how to configure your project so that Deployment Manager can create Compute Engine virtual machine instances using operating system images that belong to another project.

For example, assume you have a project named Awesome Project where Deployment Manager creates and manages VM instances. Now, let's assume you need to use private images that belong to a different project named Database Images. To grant access to these images, the owner of Database Images must grant the IAM role roles/compute.imageUser to the Google APIs service account of Awesome Project, and Awesome Project can then use images from the Database Images project.

You can also use this process to grant managed instance groups access to images from other projects.

Before you begin

Limitations

The following are restrictions for using this feature:

  • You must grant the compute.imageUser role on the project level.
  • Granting the compute.imageUser role grants permissions to all images in the specific project. It is not possible to share specific images.
  • You must grant this role to specific users, and not to allAuthenticatedUsers or allUsers.

Granting access to images

To grant access to images that belong to another project, the owner of the project that owns the images must grant access to the Google APIs service account of the project that wants to use the images.

  1. Go to the IAM page in the GCP Console of the project that needs access to private images owned by another project.

    Go to the IAM page

  2. If prompted, select your project from the list. Remember to select the project that needs access to images stored in another project.
  3. Look for Google APIs service account, which has an email address in the following format:

    [PROJECT_NUMBER]@cloudservices.gserviceaccount.com
    
  4. Make note of the email address above. Next, a project owner of the project where the desired images live can grant the Google APIs service account the roles/compute.imageUser role.

    Console

    1. While still in the Google Cloud Platform Console, go to the IAM page of the project that contains the images you want access to.

      Go to the IAM page

    2. Select the project from the project list.
    3. Click the Add button to add a new member.
    4. In the Members box, enter the email address of the service account.
    5. Expand the Roles dropdown and select Compute Engine > Compute Image User.
    6. Click Add to add the account.

    gcloud

    With the gcloud command-line tool, add a binding to the Cloud IAM policy for the project:

    gcloud projects add-iam-policy-binding [PROJECT_ID] \
        --member serviceAccount:[SERVICE_ACCOUNT_EMAIL] --role roles/compute.imageUser

    where:

    • [PROJECT_ID] is the ID of the project containing images you want to share.
    • [SERVICE_ACCOUNT_EMAIL] is the email of the service account.

    For example:

    gcloud projects add-iam-policy-binding database-images \
        --member serviceAccount:123456789012@cloudservices.gserviceaccount.com  \
        --role roles/compute.imageUser

    API

    In the API, make a POST request to the following URL, where [PROJECT_ID] is the ID of the project containing the images you want to share.

    POST https://cloudresourcemanager.googleapis.com/v1/projects/$[PROJECT_ID]:setIamPolicy
    

    The request body should contain the list of bindings you want to apply to this project. The roles/compute.imageUser role should be part of the binding. For example:

    {
       "policy": {
           "version": "0",
           "bindings": [
           {
               "role": "roles/owner",
               "members": [
                   "user:example@gmail.com"
               ]
           },
           {
               "role": "roles/compute.imageUser",
               "members": [
                   "serviceAccount:123456789012@cloudservices.gservbiceaccount.com"
               ]
           }
           ]
       }
    

    }

Using images from other projects in your configuration

After a project has been granted access to images from another project, users of the project can use the images by specifying the project ID of the project that the images belong to in your templates or configurations:

image: projects/[PROJECT_ID]/global/images/[IMAGE_NAME]

For example, if the image project ID is database-images, then you might provide the following image URI in your configuration:

resources:
- name: a-special-vm
  type: compute.v1.instances
  properties:
    machineType: zones/us-central1-a/machineTypes/f1-micro
    image: projects/database-images/global/images/example-database-image
    ...

After you have added the image, finish creating your configuration, then deploy it.

What's next?

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Cloud Deployment Manager Documentation