buildBaseAmi.yaml

Description: Create an AMI from an EC2 instance.
Parameters:
  ImageId:
    Description: Image ID for base EC2 instance.
    Type: 'AWS::SSM::Parameter::Value<AWS::EC2::Image::Id>'
    Default: '/aws/service/ami-amazon-linux-latest/amzn2-ami-hvm-x86_64-gp2'
  InstanceType:
    Description: Instance type to launch EC2 instances.
    Type: String
    # use a very small one for this
    Default: t3.micro
    AllowedValues: [ t3.micro, t3.small, t3.medium, t3.large, t3.xlarge ]

Resources:
  # Completes when the instance is fully provisioned and ready for AMI creation.
  AMICreate:
    Type: AWS::CloudFormation::WaitCondition
    CreationPolicy:
      ResourceSignal:
        Timeout: PT10M
  Instance:
    Type: AWS::EC2::Instance
    Properties:
      ImageId: !Ref ImageId
      InstanceType: !Ref InstanceType
      # BlockDeviceMappings:
      # - DeviceName: "/dev/xvda"
      #   Ebs:
      #     VolumeSize: '10'
      #     VolumeType: gp2
      UserData:
        "Fn::Base64": !Sub |
          #!/bin/bash -x
          
          # put script here for what to add to ami
          #update
          sudo yum update -y

          #install docker
          sudo amazon-linux-extras install docker

          # start service
          sudo service docker start

          # add docker permissions to user
          sudo usermod -a -G docker ec2-user
          sudo chkconfig docker on

          # add docker compose
          sudo curl -L https://github.com/docker/compose/releases/latest/download/docker-compose-$(uname -s)-$(uname -m) -o /usr/local/bin/docker-compose
          sudo chmod +x /usr/local/bin/docker-compose

          # signal the finishing of the ami
          /opt/aws/bin/cfn-signal \
            -e $? \
            --stack ${AWS::StackName} \
            --region ${AWS::Region} \
            --resource AMICreate
          
          # shutdown so the ami can be created
          shutdown -h now
Outputs:
  Instance:
    Value: !Ref Instance