cfnc

A command-line tool for managing CloudFormation Stacks at scale.

Features

• Create/Update/Delete multiple CloudFormation stacks in parallel or sequentially
• Customize the CloudFormation stacks dependency using yaml config
• Delete multiple CloudFormation stacks respecting the creation sequence
• DryRun mode to plan the change
• Generate/Validate/visualize configuration with ease
• Supports Go Template for dynamic value substitution

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Overview

As infrastructure grows more complex, managing multiple CloudFormation Stacks becomes a challenge. Typically, actions such as creating, updating, or deleting stacks are performed on a single stack at a time. In addition deleting stacks in a development or testing environment can be cumbersome because we usually want to destroy whole environment and to do that stacks must be deleted in the reverse order of creation.

cfn-compose offers a solution to this problem by providing a way to manage multiple, related stacks using a declarative yaml language, making the process easier and more streamlined. For more details please go through the rest of the Readme.

Installation

Binary is available for Linux, Windows and Mac OS (amd64 and arm64). Download the binary for your respective platform from the releases page.

Using go cli

go install github.com/rbalman/cfn-compose@latest

Limitations

• Supports limited CFN attributes
• No Retry Mechanism
• No Configurable concurrency. One Go routine is spun for every flow.
• One compose file can have max 50 flows and each flow can have up to 50 stacks. This is by design, to limit stacks in a compose file.

Usage

➜ cfnc --help
Manage cloudformation stacks at scale. Design and deploy multiple cloudformation stacks either in sequence or in parallel using declarative configuration

Usage:
  cfnc [command]

Available Commands:
  completion  Generate the autocompletion script for the specified shell
  config      Generate, validate and visualize the compose configuration
  deploy      Deploys the stacks based on the sequence specified in the compose configuration
  destroy     Destroys all the stacks in the reverse order of creation
  help        Help about any command

Flags:
  -c, --config string     File path to compose file (default "cfn-compose.yml")
  -d, --dry-run           Run commands in dry run mode
  -h, --help              help for cfnc
  -l, --loglevel string   Specify Log Levels. Valid Levels are: DEBUG, INFO, WARN, ERROR (default "INFO")
  -v, --version           version for cfnc

Use "cfnc [command] --help" for more information about a command.

Examples

## Deploy
cfnc deploy
## Deploy in dry run mode
cfnc deploy -d

## Destroy
cfnc destroy
## Destroy in dry run mode
cfnc destroy -d

## Generate Validate and Visualize compose configuration
cfnc config generate
cfnc config validate
cfnc config visualize

Man

Command	Options	Description
cfnc	-h, --help, help	Get description of cfnc
cfnc	-d, --dry-run	enable dry run mode
cfnc	-l, --loglevel	Specify Log Levels. Valid Levels are: DEBUG, INFO, WARN, ERROR (default "INFO")
cfnc	-c, --config	File path to compose file (default "cfn-compose.yml")
cfnc deploy	with no flag	deploys all the stacks
cfnc deploy	-f, --flow	Cherry pick specific flow to deploy
cfnc destroy	with no flag	destroys all the stacks
cfnc destroy	-f, --flow	Cherry pick specific flow to destroy
cfnc config generate	no flags	Generates compose template
cfnc config validate	no flags	Validates the compose configuration
cfnc config visualize	no flags	Visualize the stacks dependencies and creation order
cfnc	-v, --version	version for cfnc

Documentation

Sample Config File:

Description: Sample CloudFormation Compose file
Vars:
  Key1: Value1
  Key2: Value2
Flows:
  Flow1:
    Order: 0
    Description: Flow1 Description
    Stacks:
      - Stack1
      - Stack2
  Flow2:
    Order: 1
    Description: Flow2 description
    Stacks:
      - Stack1
      - Stack2

A typical compose configuration contains:

• Optional Description
• Optional Vars section to define variables in Key: Value mapping. Only static variables are supported at the moment. eg:

Vars:
  ENV_TYPE: 'nonproduction'
  ENV_NAME: 'demo'
  AWS_PROFILE: 'demo'

• Mandatory Flows: section Flow is a collection of CloudFormation stacks that are deployed sequentially. Flows is collection of flow which can be ordered using Order property. Flows can run in parallel or sequentially based on the Order property.
  • Optional Order can be any unsigned integer. Default Order is set to 0. Flow with lowest orders are deployed first.
  • Optional Description
  • Mandatory Stacks which is the collection of CFN stack. Below are the supported attributes of the stack object
    • mandatory template_file or template_url (only s3 url)
    • mandatory stack_name
    • optional capabilities
    • optional parameters
    • optional tags
    • optional tags

Sample:

Description: Sample CloudFormation Compose file
Vars:
  ENV_NAME: cfnc
  ENV_TYPE: nonproduction
Flows:
  SecurityGroup:
    Order: 0
    Description: Creates SecurityGroup
    Stacks:
      - template_file: <cfn-template-path>
        stack_name: stack-name1
        parameters:
          EnvironmentName: '{{ .ENV_NAME }}'
          EnvironmentType: '{{ .ENV_TYPE }}'
        tags:
          EnvironmentName: '{{ .ENV_NAME }}'
          EnvironmentType: '{{ .ENV_TYPE }}'

  EC2Instance:
    Order: 1
    Description: Deploying EC2 Instance
    Stacks:
      - template_file: <cfn-template-path>
        stack_name: stack-name2
        parameters:
          EnvironmentName: '{{ .ENV_NAME }}'
          EnvironmentType: '{{ .ENV_TYPE }}'
        tags:
          EnvironmentName: '{{ .ENV_NAME }}'
          EnvironmentType: '{{ .ENV_TYPE }}'

Please consult examples for quick start ec2-sg example and demo ec2-sqs-rds example

Contribution

There exists ample opportunity for enhancement and you are welcome to make a valuable contribution. If you have any concerns, recommendations, ideas feel free to create issues or create PR. Details Example