A self-deleting EC2 Instance in a Cloudformation stack

self-deleting-ec2.yml

AWSTemplateFormatVersion: 2010-09-09
Description: A self-deleting EC2 instance

Parameters:

  VpcId:
    Type: AWS::EC2::VPC::Id
    Description: VPC to use

  InstanceType:
    Description: EC2 instance type
    Type: String
    Default: t3.nano
  
  AMIID:
    Type: String
    Description: Your AMI ID

Resources:

  EC2InstanceRole:
    Type: AWS::IAM::Role
    Properties:
      RoleName: !Ref AWS::StackName
      AssumeRolePolicyDocument:
        Statement:
        - Effect: Allow
          Principal:
            Service:
              - ec2.amazonaws.com
          Action:
            - sts:AssumeRole
      Path: /
      Policies:
        - PolicyName: !Ref AWS::StackName
          PolicyDocument:
            Statement:
              - Effect: Allow
                Action:
                  - cloudformation:DeleteStack
                Resource:
                  - !Sub arn:aws:cloudformation:${AWS::Region}:${AWS::AccountId}:stack/${AWS::StackName}

  EC2InstanceProfile:
    Type: AWS::IAM::InstanceProfile
    Properties:
      Path: /
      Roles:
        - !Ref EC2InstanceRole

  EC2Instance:
    Type: AWS::EC2::Instance
    Metadata:
      AWS::CloudFormation::Init:
        config:
          files:
            /opt/aws/bin/somefile.txt:
              content: |
                here goes the contents of your file
              mode: '000755'
              owner: root
              group: root
    Properties:
      ImageId: !Ref AMIID
      AvailabilityZone: !Sub ${AWS::Region}a
      InstanceType: !Ref InstanceType
      IamInstanceProfile: !Ref EC2InstanceProfile
      InstanceInitiatedShutdownBehavior: terminate
      SecurityGroupIds:
        - !Ref SecurityGroup
      Tags:
        - Key: Name
          Value: SelfDeletingInstance
      UserData:
        Fn::Base64:
          !Sub |
            #!/bin/bash
            set -euxo pipefail;
            trap '/opt/aws/bin/cfn-signal -e 1 --resource EC2Instance --region ${AWS::Region} --stack ${AWS::StackName}' ERR;
            
            ## Your scripts go here or use AWS::CloudFormation::Init

            # cfn-init
            /opt/aws/bin/cfn-init -v --stack ${AWS::StackName} --resource EC2Instance --region ${AWS::Region};
            /opt/aws/bin/cfn-signal -e $? --stack ${AWS::StackName} --resource EC2Instance --region ${AWS::Region};

            # Terminate
            sleep 30;
            /opt/aws/bin/aws cloudformation delete-stack --region ${AWS::Region} --stack-name ${AWS::StackName};
            /sbin/shutdown -h now;