AWS CloudFormation 管理ツール | Rain を使ってみよう！

$ rain -h
Rain is a command line tool for working with AWS CloudFormation templates and stacks

Usage:
  rain [command]

Stack commands:
  cat         Get the CloudFormation template from a running stack
  deploy      Deploy a CloudFormation stack from a local template
  logs        Show the event log for the named stack
  ls          List running CloudFormation stacks
  rm          Delete a running CloudFormation stack
  watch       Display an updating view of a CloudFormation stack

Template commands:
  build       Create CloudFormation templates
  diff        Compare CloudFormation templates
  fmt         Format CloudFormation templates
  merge       Merge two or more CloudFormation templates
  pkg         Package local artifacts into a template
  tree        Find dependencies of Resources and Outputs in a local template

Other Commands:
  console     Login to the AWS console
  help        Help about any command
  info        Show your current configuration

$ rain build -h
Outputs a CloudFormation template containing the named resource types.

Usage:
  rain build [<resource type>...]

Flags:
  -b, --bare        Produce a minimal template, omitting all optional resource properties
      --debug       Output debugging information
  -h, --help        help for build
  -j, --json        Output the template as JSON (default format: YAML)
  -l, --list        List all CloudFormation resource types
      --no-colour   Disable colour output

$ rain build -l | grep -i VPC
AWS::ApiGateway::VpcLink
AWS::ApiGatewayV2::VpcLink
AWS::EC2::LocalGatewayRouteTableVPCAssociation
AWS::EC2::VPC
AWS::EC2::VPCCidrBlock
AWS::EC2::VPCDHCPOptionsAssociation
AWS::EC2::VPCEndpoint
AWS::EC2::VPCEndpointConnectionNotification
AWS::EC2::VPCEndpointService
AWS::EC2::VPCEndpointServicePermissions
AWS::EC2::VPCGatewayAttachment
AWS::EC2::VPCPeeringConnection
AWS::MediaConnect::FlowVpcInterface

$ rain build AWS::EC2::VPC > vpc.yaml

$ cat vpc.yaml
AWSTemplateFormatVersion: "2010-09-09"

Description: Template generated by rain

Resources:
  MyVPC:
    Type: AWS::EC2::VPC
    Properties:
      CidrBlock: CHANGEME
      EnableDnsHostnames: false # Optional
      EnableDnsSupport: false # Optional
      InstanceTenancy: CHANGEME # Optional
      Tags:
        - Key: CHANGEME
          Value: CHANGEME

Outputs:
  MyVPCCidrBlock:
    Value: !GetAtt MyVPC.CidrBlock

  MyVPCCidrBlockAssociations:
    Value: !GetAtt MyVPC.CidrBlockAssociations

  MyVPCDefaultNetworkAcl:
    Value: !GetAtt MyVPC.DefaultNetworkAcl

  MyVPCDefaultSecurityGroup:
    Value: !GetAtt MyVPC.DefaultSecurityGroup

  MyVPCIpv6CidrBlocks:
    Value: !GetAtt MyVPC.Ipv6CidrBlocks

$ rain build -b AWS::EC2::VPC > vpc_bare.yaml

$ cat vpc_bare.yaml
AWSTemplateFormatVersion: "2010-09-09"

Description: Template generated by rain

Resources:
  MyVPC:
    Type: AWS::EC2::VPC
    Properties:
      CidrBlock: CHANGEME

# vpc_bare.yaml

AWSTemplateFormatVersion: "2010-09-09"

Description: Template generated by rain

Resources:
  MyVPC:
    Type: AWS::EC2::VPC
    Properties:
      CidrBlock: 10.0.0.0/16

$ rain deploy vpc_bare.yaml vpc
CloudFormation will make the following changes:
Stack vpc:
  + AWS::EC2::VPC MyVPC
Do you wish to continue? (Y/n) Y
Deploying template 'vpc_bare.yaml' as stack 'vpc' in ap-northeast-1.
Stack vpc: CREATE_COMPLETE
Successfully deployed vpc

$ rain rm vpc
Stack vpc: CREATE_COMPLETE
Are you sure you want to delete this stack? (y/N) y
Successfully deleted stack 'vpc'