AWS Cloudformation – 1 VPC, Two EC2 Instances

AWS Cloud

March 9, 2023Tristan SelfLeave a Comment

Another very simple AWS Cloudformation example. The template deploys the following:

VPC
Two Public Subnets
Internet Gateway
Route Table
Associations (between subnets, route table and VPC)
Two EC2 Instances (which are bootstrapped to run a simple HTTPD service)

AWSTemplateFormatVersion: 2010-09-09

Description: AWS Cloudformation Template - Create a deployment to publish a Web Status Page

Parameters:
  VPCName:
    Description: Name of the VPC
    Type: String

  KeyName:
    Description: Name of an existing EC2 KeyPair to enable SSH access to the instance
    Type: 'AWS::EC2::KeyPair::KeyName'
    ConstraintDescription: must be the name of an existing EC2 KeyPair.

  InstanceType:
    Description: WebServer EC2 instance type
    Type: String
    Default: t2.small
    AllowedValues:
      - t1.micro
      - t2.nano
      - t2.micro
      - t2.small
      - t2.medium
      - t2.large
      - m1.small
      - m1.medium
      - m1.large
      - m1.xlarge
      - m2.xlarge
      - m2.2xlarge
      - m2.4xlarge
      - m3.medium
      - m3.large
      - m3.xlarge
      - m3.2xlarge
      - m4.large
      - m4.xlarge
      - m4.2xlarge
      - m4.4xlarge
      - m4.10xlarge
      - c1.medium
      - c1.xlarge
      - c3.large
      - c3.xlarge
      - c3.2xlarge
      - c3.4xlarge
      - c3.8xlarge
      - c4.large
      - c4.xlarge
      - c4.2xlarge
      - c4.4xlarge
      - c4.8xlarge
      - g2.2xlarge
      - g2.8xlarge
      - r3.large
      - r3.xlarge
      - r3.2xlarge
      - r3.4xlarge
      - r3.8xlarge
      - i2.xlarge
      - i2.2xlarge
      - i2.4xlarge
      - i2.8xlarge
      - d2.xlarge
      - d2.2xlarge
      - d2.4xlarge
      - d2.8xlarge
      - hi1.4xlarge
      - hs1.8xlarge
      - cr1.8xlarge
      - cc2.8xlarge
      - cg1.4xlarge
    ConstraintDescription: must be a valid EC2 instance type.

Mappings:
  AWSInstanceType2Arch:
    t1.micro:
      Arch: HVM64
    t2.nano:
      Arch: HVM64
    t2.micro:
      Arch: HVM64
    t2.small:
      Arch: HVM64
    t2.medium:
      Arch: HVM64
    t2.large:
      Arch: HVM64
    m1.small:
      Arch: HVM64
    m1.medium:
      Arch: HVM64
    m1.large:
      Arch: HVM64
    m1.xlarge:
      Arch: HVM64
    m2.xlarge:
      Arch: HVM64
    m2.2xlarge:
      Arch: HVM64
    m2.4xlarge:
      Arch: HVM64
    m3.medium:
      Arch: HVM64
    m3.large:
      Arch: HVM64
    m3.xlarge:
      Arch: HVM64
    m3.2xlarge:
      Arch: HVM64
    m4.large:
      Arch: HVM64
    m4.xlarge:
      Arch: HVM64
    m4.2xlarge:
      Arch: HVM64
    m4.4xlarge:
      Arch: HVM64
    m4.10xlarge:
      Arch: HVM64
    c1.medium:
      Arch: HVM64
    c1.xlarge:
      Arch: HVM64
    c3.large:
      Arch: HVM64
    c3.xlarge:
      Arch: HVM64
    c3.2xlarge:
      Arch: HVM64
    c3.4xlarge:
      Arch: HVM64
    c3.8xlarge:
      Arch: HVM64
    c4.large:
      Arch: HVM64
    c4.xlarge:
      Arch: HVM64
    c4.2xlarge:
      Arch: HVM64
    c4.4xlarge:
      Arch: HVM64
    c4.8xlarge:
      Arch: HVM64
    g2.2xlarge:
      Arch: HVMG2
    g2.8xlarge:
      Arch: HVMG2
    r3.large:
      Arch: HVM64
    r3.xlarge:
      Arch: HVM64
    r3.2xlarge:
      Arch: HVM64
    r3.4xlarge:
      Arch: HVM64
    r3.8xlarge:
      Arch: HVM64
    i2.xlarge:
      Arch: HVM64
    i2.2xlarge:
      Arch: HVM64
    i2.4xlarge:
      Arch: HVM64
    i2.8xlarge:
      Arch: HVM64
    d2.xlarge:
      Arch: HVM64
    d2.2xlarge:
      Arch: HVM64
    d2.4xlarge:
      Arch: HVM64
    d2.8xlarge:
      Arch: HVM64
    hi1.4xlarge:
      Arch: HVM64
    hs1.8xlarge:
      Arch: HVM64
    cr1.8xlarge:
      Arch: HVM64
    cc2.8xlarge:
      Arch: HVM64
  AWSInstanceType2NATArch:
    t1.micro:
      Arch: NATHVM64
    t2.nano:
      Arch: NATHVM64
    t2.micro:
      Arch: NATHVM64
    t2.small:
      Arch: NATHVM64
    t2.medium:
      Arch: NATHVM64
    t2.large:
      Arch: NATHVM64
    m1.small:
      Arch: NATHVM64
    m1.medium:
      Arch: NATHVM64
    m1.large:
      Arch: NATHVM64
    m1.xlarge:
      Arch: NATHVM64
    m2.xlarge:
      Arch: NATHVM64
    m2.2xlarge:
      Arch: NATHVM64
    m2.4xlarge:
      Arch: NATHVM64
    m3.medium:
      Arch: NATHVM64
    m3.large:
      Arch: NATHVM64
    m3.xlarge:
      Arch: NATHVM64
    m3.2xlarge:
      Arch: NATHVM64
    m4.large:
      Arch: NATHVM64
    m4.xlarge:
      Arch: NATHVM64
    m4.2xlarge:
      Arch: NATHVM64
    m4.4xlarge:
      Arch: NATHVM64
    m4.10xlarge:
      Arch: NATHVM64
    c1.medium:
      Arch: NATHVM64
    c1.xlarge:
      Arch: NATHVM64
    c3.large:
      Arch: NATHVM64
    c3.xlarge:
      Arch: NATHVM64
    c3.2xlarge:
      Arch: NATHVM64
    c3.4xlarge:
      Arch: NATHVM64
    c3.8xlarge:
      Arch: NATHVM64
    c4.large:
      Arch: NATHVM64
    c4.xlarge:
      Arch: NATHVM64
    c4.2xlarge:
      Arch: NATHVM64
    c4.4xlarge:
      Arch: NATHVM64
    c4.8xlarge:
      Arch: NATHVM64
    g2.2xlarge:
      Arch: NATHVMG2
    g2.8xlarge:
      Arch: NATHVMG2
    r3.large:
      Arch: NATHVM64
    r3.xlarge:
      Arch: NATHVM64
    r3.2xlarge:
      Arch: NATHVM64
    r3.4xlarge:
      Arch: NATHVM64
    r3.8xlarge:
      Arch: NATHVM64
    i2.xlarge:
      Arch: NATHVM64
    i2.2xlarge:
      Arch: NATHVM64
    i2.4xlarge:
      Arch: NATHVM64
    i2.8xlarge:
      Arch: NATHVM64
    d2.xlarge:
      Arch: NATHVM64
    d2.2xlarge:
      Arch: NATHVM64
    d2.4xlarge:
      Arch: NATHVM64
    d2.8xlarge:
      Arch: NATHVM64
    hi1.4xlarge:
      Arch: NATHVM64
    hs1.8xlarge:
      Arch: NATHVM64
    cr1.8xlarge:
      Arch: NATHVM64
    cc2.8xlarge:
      Arch: NATHVM64
  AWSRegionArch2AMI:
    af-south-1:
      HVM64: ami-064cc455f8a1ef504
      HVMG2: NOT_SUPPORTED
    ap-east-1:
      HVM64: ami-f85b1989
      HVMG2: NOT_SUPPORTED
    ap-northeast-1:
      HVM64: ami-0b2c2a754d5b4da22
      HVMG2: ami-09d0e0e099ecabba2
    ap-northeast-2:
      HVM64: ami-0493ab99920f410fc
      HVMG2: NOT_SUPPORTED
    ap-northeast-3:
      HVM64: ami-01344f6f63a4decc1
      HVMG2: NOT_SUPPORTED
    ap-south-1:
      HVM64: ami-03cfb5e1fb4fac428
      HVMG2: ami-0244c1d42815af84a
    ap-southeast-1:
      HVM64: ami-0ba35dc9caf73d1c7
      HVMG2: ami-0e46ce0d6a87dc979
    ap-southeast-2:
      HVM64: ami-0ae99b503e8694028
      HVMG2: ami-0c0ab057a101d8ff2
    ca-central-1:
      HVM64: ami-0803e21a2ec22f953
      HVMG2: NOT_SUPPORTED
    cn-north-1:
      HVM64: ami-07a3f215cc90c889c
      HVMG2: NOT_SUPPORTED
    cn-northwest-1:
      HVM64: ami-0a3b3b10f714a0ff4
      HVMG2: NOT_SUPPORTED
    eu-central-1:
      HVM64: ami-0474863011a7d1541
      HVMG2: ami-0aa1822e3eb913a11
    eu-north-1:
      HVM64: ami-0de4b8910494dba0f
      HVMG2: ami-32d55b4c
    eu-south-1:
      HVM64: ami-08427144fe9ebdef6
      HVMG2: NOT_SUPPORTED
    eu-west-1:
      HVM64: ami-015232c01a82b847b
      HVMG2: ami-0d5299b1c6112c3c7
    eu-west-2:
      HVM64: ami-0765d48d7e15beb93
      HVMG2: NOT_SUPPORTED
    eu-west-3:
      HVM64: ami-0caf07637eda19d9c
      HVMG2: NOT_SUPPORTED
    me-south-1:
      HVM64: ami-0744743d80915b497
      HVMG2: NOT_SUPPORTED
    sa-east-1:
      HVM64: ami-0a52e8a6018e92bb0
      HVMG2: NOT_SUPPORTED
    us-east-1:
      HVM64: ami-032930428bf1abbff
      HVMG2: ami-0aeb704d503081ea6
    us-east-2:
      HVM64: ami-027cab9a7bf0155df
      HVMG2: NOT_SUPPORTED
    us-west-1:
      HVM64: ami-088c153f74339f34c
      HVMG2: ami-0a7fc72dc0e51aa77
    us-west-2:
      HVM64: ami-01fee56b22f308154
      HVMG2: ami-0fe84a5b4563d8f27

Resources:
  VPC:
    Type: "AWS::EC2::VPC"
    Properties:
      EnableDnsSupport: 'true'
      EnableDnsHostnames: 'true'
      CidrBlock: "192.168.0.0/16"
      Tags:
      - Key: "Name"
        Value: !Ref VPCName

  PublicSubnet1:
    Type: "AWS::EC2::Subnet"
    Properties:
      VpcId: !Ref "VPC"
      CidrBlock: "192.168.0.0/24"
      MapPublicIpOnLaunch: 'true'
      Tags:
      - Key: "Name"
        Value: "PublicSubnet1"
  
  PublicSubnet2:
    Type: "AWS::EC2::Subnet"
    Properties:
      VpcId: !Ref "VPC"
      CidrBlock: "192.168.1.0/24"
      MapPublicIpOnLaunch: 'true'
      Tags:
      - Key: "Name"
        Value: "PublicSubnet2"

  RouteTable:
    Type: "AWS::EC2::RouteTable"
    Properties:
      VpcId: !Ref "VPC"

  InternetGateway:
    Type: "AWS::EC2::InternetGateway"

  VPCGatewayAttachment:
    Type: "AWS::EC2::VPCGatewayAttachment"
    Properties:
      VpcId: !Ref "VPC"
      InternetGatewayId: !Ref "InternetGateway"

  InternetRoute:
    Type: "AWS::EC2::Route"
    Properties:
      DestinationCidrBlock: "0.0.0.0/0"
      GatewayId: !Ref InternetGateway
      RouteTableId: !Ref RouteTable

  PublicSubnet1RouteTableAssociation:
    Type: "AWS::EC2::SubnetRouteTableAssociation"
    Properties:
      RouteTableId: !Ref RouteTable
      SubnetId: !Ref PublicSubnet1

  PublicSubnet2RouteTableAssociation:
    Type: "AWS::EC2::SubnetRouteTableAssociation"
    Properties:
      RouteTableId: !Ref RouteTable
      SubnetId: !Ref PublicSubnet2
  
  EC2Instance1:
    Type: 'AWS::EC2::Instance'
    Properties:
      InstanceType: !Ref InstanceType
      KeyName: !Ref KeyName
      SubnetId: !Ref PublicSubnet1
      SecurityGroupIds: 
        - !Ref WebServerSecurityGroup
      ImageId: !FindInMap 
        - AWSRegionArch2AMI
        - !Ref 'AWS::Region'
        - !FindInMap 
          - AWSInstanceType2Arch
          - !Ref InstanceType
          - Arch
      UserData:
        Fn::Base64:
          !Sub |
            #!/bin/bash
            yum update -y
            yum install -y httpd
            /etc/init.d/httpd start
            echo ?Hello World from $(hostname -f)? > /var/www/html/index.html
            echo "---- UserData Complete ----"

  EC2Instance2:
    Type: 'AWS::EC2::Instance'
    Properties:
      InstanceType: !Ref InstanceType
      KeyName: !Ref KeyName
      SubnetId: !Ref PublicSubnet2
      SecurityGroupIds: 
        - !Ref WebServerSecurityGroup
      ImageId: !FindInMap 
        - AWSRegionArch2AMI
        - !Ref 'AWS::Region'
        - !FindInMap 
          - AWSInstanceType2Arch
          - !Ref InstanceType
          - Arch
      UserData:
        Fn::Base64:
          !Sub |
            #!/bin/bash
            yum update -y
            yum install -y httpd
            /etc/init.d/httpd start
            echo ?Hello World from $(hostname -f)? > /var/www/html/index.html
            echo "---- UserData Complete ----"

  WebServerSecurityGroup:
    Type: 'AWS::EC2::SecurityGroup'
    Properties:
      GroupDescription: Enable SSH and HTTP Inbound Access
      VpcId: !Ref "VPC"
      SecurityGroupIngress:
        - IpProtocol: tcp
          FromPort: '22'
          ToPort: '22'
          CidrIp: 0.0.0.0/0
        - IpProtocol: tcp
          FromPort: '80'
          ToPort: '80'
          CidrIp: 0.0.0.0/0
        - IpProtocol: tcp
          FromPort: '443'
          ToPort: '443'
          CidrIp: 0.0.0.0/0
      Tags:
      - Key: "Name"
        Value: "WebServerSecurityGroup"

Outputs:
  VpcId:
    Description: The VPC ID
    Value: !Ref VPC

  InstanceId1:
    Description: InstanceId of the newly created EC2 instance
    Value: !Ref EC2Instance1
  
  AZ1:
    Description: Availability Zone of the newly created EC2 instance
    Value: !GetAtt 
      - EC2Instance1
      - AvailabilityZone

  PublicDNS1:
    Description: Public DNSName of the newly created EC2 instance
    Value: !GetAtt 
      - EC2Instance1
      - PublicDnsName

  PublicIP1:
    Description: Public IP address of the newly created EC2 instance
    Value: !GetAtt 
      - EC2Instance1
      - PublicIp

  InstanceId2:
    Description: InstanceId of the newly created EC2 instance
    Value: !Ref EC2Instance2

  AZ2:
    Description: Availability Zone of the newly created EC2 instance
    Value: !GetAtt 
      - EC2Instance2
      - AvailabilityZone

  PublicDNS2:
    Description: Public DNSName of the newly created EC2 instance
    Value: !GetAtt 
      - EC2Instance2
      - PublicDnsName

  PublicIP2:
    Description: Public IP address of the newly created EC2 instance
    Value: !GetAtt 
      - EC2Instance2
      - PublicIp

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