Resources

Resources

Declaring Resources in the Resources Section

Each entry under Resources has a logical ID, a Type from the registry and Properties defined by that type's schema (Registry and Providers), plus optional attributes: Condition, DependsOn, DeletionPolicy, UpdateReplacePolicy (Deletion Policies), Metadata, and CreationPolicy/UpdatePolicy for a few types. A template may declare up to 500 resources.

infra/booknest-data.yaml: the Resources sectionYAML

Resources:
  BooksTable:
    Type: AWS::DynamoDB::Table
    Properties:
      TableName: !Sub booknest-${Stage}-${TableSuffix}
      BillingMode: !FindInMap [StageSettings, !Ref Stage, BillingMode]
      ProvisionedThroughput: !If
        - IsProd
        - {ReadCapacityUnits: !Ref ReadCapacity, WriteCapacityUnits: 5}
        - !Ref AWS::NoValue
      AttributeDefinitions: [{AttributeName: id, AttributeType: N}]
      KeySchema: [{AttributeName: id, KeyType: HASH}]
  FrontEndBucket:
    Type: AWS::S3::Bucket
  AccessLogs:
    Type: AWS::Logs::LogGroup
    Condition: IsProd
    Properties:
      LogGroupName: !Sub /booknest/${Stage}/access
      RetentionInDays: !FindInMap [StageSettings, !Ref Stage, LogRetentionDays]

Deploy one stack per stage from the same file:

One template, a dev stack and a prod stackYAML

cfn-lint booknest-data.yaml && echo "cfn-lint: no findings"
aws cloudformation deploy --stack-name booknest-data-dev --template-file booknest-data.yaml
aws cloudformation deploy --stack-name booknest-data-prod --template-file booknest-data.yaml \
  --parameter-overrides Stage=prod ReadCapacity=10
for s in dev prod; do aws cloudformation describe-stack-resources --output text \
  --stack-name booknest-data-$s --query 'StackResources[].LogicalResourceId'; done
aws dynamodb describe-table --table-name booknest-prod-books --output text \
  --query 'Table.ProvisionedThroughput.ReadCapacityUnits'

Output

cfn-lint: no findings
Waiting for changeset to be created..
Waiting for stack create/update to complete
Successfully created/updated stack - booknest-data-dev
Waiting for changeset to be created..
Waiting for stack create/update to complete
Successfully created/updated stack - booknest-data-prod
BooksTable   FrontEndBucket
AccessLogs   BooksTable   FrontEndBucket
10

Dev has two resources, prod three, and only prod's table has ten read units. Building the table name from parameters keeps the stages apart in one account.

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