CODEWITHSUNDEEP
amazon-web-servicesaws-cloudformationamazon-vpc
ozil
ozil

Reputation: 669

how to pass reference to existing VPC to a cloudformation template?

I am creating a cloudformation template, with few resources, couple of lambda functions , S3 bucket.see code below, it is work on progress and so far I have a S3 bucket and a lamda function triggered by S3. we have vpc defined in our team that we are supposed to use. I would like to add private subnet under that vpc for my lambda function and assign public subnet for the s3 bucket. how to get reference of the vpc , and pass it to my template and use it? sample code will be helpful.

AWSTemplateFormatVersion: 2010-09-09
Resources:

  # S3 Bucket
  S3Bucket:
    Type: AWS::S3::Bucket

  # Functions
  S3-Lambda-trigger:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: .
      Handler: lambda.handler
      Description: s3 object creation triggers lambda
      Runtime: nodejs12.x
      Events:
        S3Bucket:
          Type: S3
          Properties:
            Bucket: !Ref S3Bucket
            Events: 's3:ObjectCreated:*'

  # Permissions
  Allow-lamda-invocation-s3:
    Type: AWS::Lambda::Permission
    Properties:
      Action: 'lambda:InvokeFunction'
      FunctionName: !Ref S3-Lambda-trigger
      Principal: s3.amazonaws.com
      SourceArn: !GetAtt S3Bucket.Arn

Upvotes: 1

Views: 2561

Answers (1)

Marcin
Marcin

Reputation: 238081

how to get reference of the vpc , and pass it to my template and use it?

One way would be through AWS-Specific Parameter Types, specifically AWS::EC2::VPC::Id, in a Parameters section.

For example:

AWSTemplateFormatVersion: 2010-09-09

Parameters: 

  VPCId: 
    Type: AWS::EC2::VPC::Id

Resources:

  MySubnet:
    Type: AWS::EC2::Subnet
    Properties: 
      # other properties
      VpcId: !Ref VPCId

Thanks to this, when creating the stack in AWS Console, you would be able to choose existing VPCId to pass to the template.

Upvotes: 1

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