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Build the Template

Let’s build the blueprint.

lono build demo

The lono build command builds the blueprint and compiles down the template to the output folder.

$ lono build demo
Building template
    output/demo/template.yml
Building parameters
    output/demo/params.json
$

View Files

You can see that the DSL was compiled down to a CloudFormation YAML template.

output/demo/template.yml

---
Parameters:
  BucketName:
    Default: ''
    Type: String
  AccessControl:
    Default: Private
    Type: String
Conditions:
  HasBucketName:
    Fn::Not:
    - Fn::Equals:
      - Ref: BucketName
      - ''
Resources:
  Bucket:
    Type: AWS::S3::Bucket
    Properties:
      BucketName:
        Fn::If:
        - HasBucketName
        - Ref: BucketName
        - Ref: AWS::NoValue
      AccessControl:
        Ref: AccessControl
Outputs:
  BucketName:
    Value:
      Ref: Bucket

Custom parameters values was also compiled down to a JSON file. In this case it’s currently empty.

output/demo/params.json

[]

This files are useful for debugging. They can actually be used with the aws cloudformation CLI commands. Example:

cd output/demo
aws cloudformation create-stack --stack-name demo-dev --template-body file://template.yml --parameters file://params.json

Lono makes it easier though by automating the process with the lono up command, which we’ll cover next.

Next, we’ll deploy the infrastructure.