Cloudformation YAML for an Ubuntu 20.04 dev environment with the free tier on AWS and SSH access.

dev-environment.yml

AWSTemplateFormatVersion: 2010-09-09
Description: EC2 based SSH dev environment for VSCode Remote SSH
Parameters:
  Key:
    Type: String
    Description: The name of your amazon EC2 security key
Resources:
  DevEnvironmentSubnet:
    Type: 'AWS::EC2::Subnet'
    Properties:
      CidrBlock: "10.0.0.0/25"
      VpcId: !Ref VPC
      MapPublicIpOnLaunch: true
  DevEnvironmentInternetGateway:
    Type: 'AWS::EC2::InternetGateway'
  DevEnvironmentInternetGatewayAttachment:
    Type: 'AWS::EC2::VPCGatewayAttachment'
    Properties:
      InternetGatewayId: !Ref DevEnvironmentInternetGateway
      VpcId: !Ref VPC
  DevEnvironmentRouteTable:
    Type: 'AWS::EC2::RouteTable'
    Properties:
      VpcId: !Ref VPC
  DevEnvironmentRoute:
    DependsOn: DevEnvironmentInternetGatewayAttachment
    Type: 'AWS::EC2::Route'
    Properties:
      RouteTableId: !Ref DevEnvironmentRouteTable
      DestinationCidrBlock: "0.0.0.0/0"
      GatewayId: !Ref DevEnvironmentInternetGateway
  DevEnvironmentSubnetRouteTableAssociation:
    Type: 'AWS::EC2::SubnetRouteTableAssociation'
    Properties:
      RouteTableId: !Ref DevEnvironmentRouteTable
      SubnetId: !Ref DevEnvironmentSubnet
  DevEnvironmentSecurityGroup:
    Type: 'AWS::EC2::SecurityGroup'
    Properties:
      GroupDescription: Allow SSH inbound and outbound traffic
      SecurityGroupIngress:
        - IpProtocol: tcp
          FromPort: 22
          ToPort: 22
          CidrIp: 0.0.0.0/0
      VpcId: !Ref VPC
  DevEnvironmentInstance:
    Type: 'AWS::EC2::Instance'
    Properties:
      ImageId: ami-0264425fd74a35f64
      InstanceType: t2.micro
      SubnetId: !Ref DevEnvironmentSubnet
      SecurityGroupIds:
        - !Ref DevEnvironmentSecurityGroup
      KeyName: !Ref Key
  DevEnvironmentEIP:
    Type: 'AWS::EC2::EIP'
    Properties:
      Domain: vpc
      InstanceId: !Ref DevEnvironmentInstance
  
  VPC:
    Type: 'AWS::EC2::VPC'
    Properties: 
      CidrBlock: "10.0.0.0/24"
Outputs:
  WebsiteURL:
    Value: !Sub '${DevEnvironmentEIP}'
    Description: IP Address