Say you want to free up a domain that you've used on a different project on GCP or GAE.
When you try to use the domain, you get an error like:
error: [domain] is already mapped to a project
To solve this, use the command line (assuming you have the developer tools and so use gcloud regularly to deploy your apps) and do the following:
gcloud auth login
This will open a browser window for you to sign in with your Google account.
Set the project in the gcloud tool to the old project where the domain is currently mapped:
gcloud config set project PROJECT_ID
Replace PROJECT_ID with the actual Project ID of the old project.
List the domain mappings for the old project:
gcloud app domain-mappings list
Locate the domains you want to remove from the list, and then run the following command to delete the domain mapping:
gcloud app domain-mappings delete DOMAIN_NAME
... replacing DOMAIN_NAME with the actual domain you want to remove.
After a bit of waiting, you'll be able use the domain again in a custom mapping.
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This post explains how to remove an existing custom domain mapping from a Google App Engine project using the gcloud command-line interface. Managing domain mappings, project configurations, and cloud resources through CLI tools is an essential skill for deploying and maintaining cloud-based applications on Google Cloud Platform.
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