rain

List all CloudFormation stacks in the current region

$ rain ls

$ rain deploy [template.yaml] [stack-name]

$ rain cat [stack-name]

$ rain logs [stack-name]

$ rain fmt [template.yaml]

$ rain diff [template1.yaml] [template2.yaml]

$ rain rm [stack-name]

$ rain forecast [template.yaml] [stack-name]

rain command [options] [arguments]

rain is a development workflow tool for AWS CloudFormation that simplifies template authoring, validation, and stack management. It provides a more user-friendly interface than the standard AWS CLI for CloudFormation operations.
Key improvements over the AWS CLI include live deployment progress with colored output, automatic template formatting, template comparison, and deployment failure prediction. Rain can detect potential issues before deployment, saving time and reducing failed stack operations.
The tool supports CloudFormation modules and can package local artifacts like Lambda code for deployment. It handles the complexity of S3 bucket management for artifacts automatically.

ls

List CloudFormation stacks or changesets in the current region

Deploy a CloudFormation stack from a local template

Retrieve and display the template of a running stack

Show the event log for the specified stack

Delete a CloudFormation stack

Format CloudFormation templates to a consistent style

Compare two CloudFormation templates

Create CloudFormation templates for specified resource types

Predict potential deployment failures

Package local artifacts for deployment (replacement for aws cloudformation package)

Create the S3 artifacts bucket for deployments

Specify AWS region

Use a specific AWS profile

Enable experimental commands

Display help information

Requires AWS credentials configured via environment variables, AWS CLI profiles, or IAM roles. Ensure the AWS account has appropriate CloudFormation and related service permissions.
Some commands like forecast are experimental and require the -x flag. Experimental features may change between versions.
Rain operates on one region at a time. Use --region to specify a different region than the default.

Rain was developed by the AWS CloudFormation team and released as an open-source tool to improve the CloudFormation development experience. The name is a play on "what happens when you have a lot of CloudFormation." It is written in Go and actively maintained on GitHub.

aws(1), terraform(1), sam(1), cdk(1)