Google Associate Cloud Engineer
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You significantly changed a complex Deployment Manager template and want to validate dependencies without applying changes. What should you do?
Simulated
Community
RRodrigo
A
Manually review all resources
B
Deploy to a staging project
C
Run gcloud deployment-manager deployments update --preview
D
Export the template to YAML
Explanation:
Explanation
Correct Answer: C) Run gcloud deployment-manager deployments update --preview
Why this is correct:
-
Preview mode: The
--previewflag in Deployment Manager allows you to validate your template changes without actually applying them. This is specifically designed for testing and validation purposes. -
Dependency validation: When you run a preview, Deployment Manager analyzes the template, validates all dependencies between resources, and shows you what changes would be made without actually making those changes.
-
Safety: This approach is safe because no resources are actually created, modified, or deleted during the preview.
Why other options are incorrect:
A) Manually review all resources:
- While manual review is good practice, it's error-prone and doesn't provide the same level of validation as automated dependency checking.
- Complex templates with many dependencies are difficult to validate manually.
B) Deploy to a staging project:
- This would actually apply the changes, which is not what you want when you only want to validate dependencies.
- It's more time-consuming and resource-intensive than using preview mode.
D) Export the template to YAML:
- Exporting to YAML just changes the format but doesn't validate dependencies or check for errors in the template.
- This doesn't provide any validation of the template's correctness or dependency relationships.
Best Practice Tip:
Always use --preview flag when making significant changes to Deployment Manager templates. This allows you to:
- Validate syntax and structure
- Check resource dependencies
- See what changes would be made
- Identify potential issues before actual deployment
Command example:
gcloud deployment-manager deployments update [DEPLOYMENT_NAME] --config [CONFIG_FILE] --preview
gcloud deployment-manager deployments update [DEPLOYMENT_NAME] --config [CONFIG_FILE] --preview
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