Validating Templates
Explore methods to validate AWS CloudFormation and SAM templates effectively. Understand how tools like CFN Lint, yamllint, and SAM CLI validation help detect syntax and resource configuration errors early, reducing deployment delays and troubleshooting time.
We'll cover the following...
YAML makes it easy to read CloudFormation template files but is very fiddly and error-prone. Small spacing issues can cause problems and that might not be immediately obvious when you read a template. CloudFormation will try deploying resources even when the template is not fully valid and then fail when it starts processing an invalid resource, so feedback on errors might take a long time with complex templates. One of the projects I work on includes custom DNS setup for a content delivery distribution which takes about 35-40 ...