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dockergoogle-cloud-platformgcloudgoogle-container-registry

How Would I List All Google Container Registry Hostnames with the Cloud SDK?

How could I list all the different Google Container Registry (GCR) hostnames found within a given Google Cloud Platform (GCP) project using the Cloud SDK (gcloud)?

I.e., how would I list all the different GCR hostnames (e.g., gcr.io, us.gcr.io, etc..,.) for a GCP project $GCP_PROJECT_ID?

Solution

  • You are unable to use the list command underneath the images subgroup [and possibly apply filters or transforms] because it only lists repositories underneath the gcr.io hostname:

    gcloud container images list

#=>

gcr.io/$GCP_PROJECT_ID/. . .
. . .
Only listing images in gcr.io/$GCP_PROJECT_ID. Use --repository to list images in other repositories.

    Attempting to apply a wildcard (*) yields the following unfavorable results:

    • gcloud container images list --repository="*.gcr.io"

#=>

ERROR: (gcloud.container.images.list) A Docker registry domain must be specified.

    • gcloud container images list --repository="*.gcr.io/*"

#=>

ERROR: (gcloud.container.images.list) Invalid repository: *, must be at least 2 characters

    • gcloud container images list --repository="*.gcr.io/**"

#=>

ERROR: (gcloud.container.images.list) Invalid repository: **, acceptable characters include: abcdefghijklmnopqrstuvwxyz0123456789_-./

    • gcloud container images list --repository="*.gcr.io/$GCP_PROJECT_ID"

#=>

ERROR: (gcloud.container.images.list) *.gcr.io/$GCP_PROJECT_ID is not in a supported registry.  Supported registries are ['gcr.io', 'us.gcr.io', . . ., 'mirror.gcr.io', 'k8s.gcr.io']

    Trying to use the list command for the services group:

    gcloud services list \
--filter="name=projects/$GCP_PROJECT_NUMBER/services/containerregistry.googleapis.com" \
--format=yaml \
--project=$GCP_PROJECT_ID

    or the search-all-resources command for the asset group:

    gcloud asset search-all-resources \
--format=yaml \
--filter="name=//serviceusage.googleapis.com/projects/$GCP_PROJECT_NUMBER/services/containerregistry.googleapis.com" \
--scope=projects/$GCP_PROJECT_ID

    doesn't reveal any information about active hostnames either.

    The only solution seems to be piping the output of the list command against the asset group into uniq:

    gcloud asset list \
--filter="assetType=containerregistry.googleapis.com/Image" \
--format="value(name.split('/').slice(3, 4))" \
--project=$GCP_PROJECT_ID | uniq

#=>

gcr.io
us.gcr.io
. . .
mirror.gcr.io
k8s.gcr.io