AWS CloudFormation template that create a VPC with a public subnet and a private subnet.

02_VPC.yml

AWSTemplateFormatVersion: '2010-09-09'
Description: CloudFormation template to create a VPC with one public subnet and one private subnet, with customizable CIDR blocks and a common prefix for all resource names.

Parameters:
  VpcCidr:
    Type: String
    Default: 10.0.0.0/16
    Description: CIDR block for the VPC
  PublicSubnetCidr:
    Type: String
    Default: 10.0.1.0/24
    Description: CIDR block for the public subnet
  PrivateSubnetCidr:
    Type: String
    Default: 10.0.2.0/24
    Description: CIDR block for the private subnet
  Prefix:
    Type: String
    Default: MyApp
    Description: Prefix for all resource names

Resources:
  # Create the VPC
  MyVPC:
    Type: AWS::EC2::VPC
    Properties: 
      CidrBlock: !Ref VpcCidr
      EnableDnsSupport: true
      EnableDnsHostnames: true
      Tags: 
        - Key: Name
          Value: !Sub "${Prefix}-VPC"

  # Create the Internet Gateway
  MyInternetGateway:
    Type: AWS::EC2::InternetGateway
    Properties: 
      Tags:
        - Key: Name
          Value: !Sub "${Prefix}-InternetGateway"

  # Attach the Internet Gateway to the VPC
  AttachGateway:
    Type: AWS::EC2::VPCGatewayAttachment
    Properties: 
      VpcId: !Ref MyVPC
      InternetGatewayId: !Ref MyInternetGateway

  # Create the Public Subnet
  MyPublicSubnet:
    Type: AWS::EC2::Subnet
    Properties: 
      VpcId: !Ref MyVPC
      CidrBlock: !Ref PublicSubnetCidr
      MapPublicIpOnLaunch: true
      AvailabilityZone: !Select [ 0, !GetAZs '' ]
      Tags: 
        - Key: Name
          Value: !Sub "${Prefix}-PublicSubnet"

  # Create the Private Subnet
  MyPrivateSubnet:
    Type: AWS::EC2::Subnet
    Properties: 
      VpcId: !Ref MyVPC
      CidrBlock: !Ref PrivateSubnetCidr
      AvailabilityZone: !Select [ 0, !GetAZs '' ]
      Tags: 
        - Key: Name
          Value: !Sub "${Prefix}-PrivateSubnet"

  # Create the Public Route Table
  MyPublicRouteTable:
    Type: AWS::EC2::RouteTable
    Properties: 
      VpcId: !Ref MyVPC
      Tags: 
        - Key: Name
          Value: !Sub "${Prefix}-PublicRouteTable"

  # Create a route in the Public Route Table to the Internet Gateway
  PublicRoute:
    Type: AWS::EC2::Route
    Properties: 
      RouteTableId: !Ref MyPublicRouteTable
      DestinationCidrBlock: 0.0.0.0/0
      GatewayId: !Ref MyInternetGateway

  # Associate the Public Subnet with the Public Route Table
  PublicSubnetRouteTableAssociation:
    Type: AWS::EC2::SubnetRouteTableAssociation
    Properties: 
      SubnetId: !Ref MyPublicSubnet
      RouteTableId: !Ref MyPublicRouteTable

  # Create the NAT Gateway in the public subnet
  MyNATGatewayEIP:
    Type: AWS::EC2::EIP
    DependsOn: AttachGateway
    Properties:
      Domain: vpc

  MyNATGateway:
    Type: AWS::EC2::NatGateway
    Properties: 
      SubnetId: !Ref MyPublicSubnet
      AllocationId: !GetAtt MyNATGatewayEIP.AllocationId
      Tags: 
        - Key: Name
          Value: !Sub "${Prefix}-NATGateway"

  # Create the Private Route Table
  MyPrivateRouteTable:
    Type: AWS::EC2::RouteTable
    Properties: 
      VpcId: !Ref MyVPC
      Tags: 
        - Key: Name
          Value: !Sub "${Prefix}-PrivateRouteTable"

  # Create a route in the Private Route Table to the NAT Gateway
  PrivateRoute:
    Type: AWS::EC2::Route
    Properties: 
      RouteTableId: !Ref MyPrivateRouteTable
      DestinationCidrBlock: 0.0.0.0/0
      NatGatewayId: !Ref MyNATGateway

  # Associate the Private Subnet with the Private Route Table
  PrivateSubnetRouteTableAssociation:
    Type: AWS::EC2::SubnetRouteTableAssociation
    Properties: 
      SubnetId: !Ref MyPrivateSubnet
      RouteTableId: !Ref MyPrivateRouteTable

Outputs:
  VPCId:
    Description: VPC ID
    Value: !Ref MyVPC
    Export:
      Name: !Sub "${Prefix}-VPCId"

  VPCArn:
    Description: VPC ARN
    Value: !Sub "arn:aws:ec2:${AWS::Region}:${AWS::AccountId}:vpc/${MyVPC}"
    Export:
      Name: !Sub "${Prefix}-VPCArn"

  PublicSubnetId:
    Description: Public Subnet ID
    Value: !Ref MyPublicSubnet
    Export:
      Name: !Sub "${Prefix}-PublicSubnetId"

  PublicSubnetArn:
    Description: Public Subnet ARN
    Value: !Sub "arn:aws:ec2:${AWS::Region}:${AWS::AccountId}:subnet/${MyPublicSubnet}"
    Export:
      Name: !Sub "${Prefix}-PublicSubnetArn"

  PrivateSubnetId:
    Description: Private Subnet ID
    Value: !Ref MyPrivateSubnet
    Export:
      Name: !Sub "${Prefix}-PrivateSubnetId"

  PrivateSubnetArn:
    Description: Private Subnet ARN
    Value: !Sub "arn:aws:ec2:${AWS::Region}:${AWS::AccountId}:subnet/${MyPrivateSubnet}"
    Export:
      Name: !Sub "${Prefix}-PrivateSubnetArn"