3-application.yml

# Nasted templates
# Dependencies: Create an s3 bucket and upload security-group.yml & ec2.yml
# & refer those endpoints while creatint this main template.

AWSTemplateFormatVersion: "2010-09-09"
Description: Template to create nasted templates

Parameters:

  VPCId:
    Description: VPC to create the security group and EC2 instance into
    Type: AWS::EC2::VPC::Id

  SGTemplateURL:
    Description: URL of the nested Security group stack template
    Type: String
  
  EC2TemplateURL:
    Description: URL of the nested EC2 instance stack template
    Type: String
  
  InstanceType:
    Description: Type of the EC2 instance
    Type: String
    Default: t2.micro

  ImageId:
    Type: String
    Default: ami-0022f774911c1d690
            

Resources:
  SSHSecurityGroupStack:
    Type: AWS::CloudFormation::Stack
    Properties:
      TemplateURL: !Ref SGTemplateURL
      Parameters:
        ApplicationName: !Ref AWS::StackName
        VPCId: !Ref VPCId
      TimeoutInMinutes: 5
  
  EC2InstanceStack:
    Type: AWS::CloudFormation::Stack
    Properties:
      TemplateURL: !Ref EC2TemplateURL
      Parameters:
        InstanceType: !Ref InstanceType
        ImageId: !Ref ImageId
        SecurityGroupId: !GetAtt SSHSecurityGroupStack.Outputs.SSHGroupId
      TimeoutInMinutes: 10

Outputs:
  SGStack:
    Value: !Ref SSHSecurityGroupStack
    Description: Security group stack
  
  EC2Stack:
    Value: !Ref EC2InstanceStack
    Description: EC2 instance stack