vpc_one_subnet.template

{
  "AWSTemplateFormatVersion" : "2010-09-09",

  "Description" : "Build an AWS VPC with a single public subnet in a single AZ.",

  "Parameters" : {

    "KeyName" : {
      "Description" : "Name of an existing EC2 KeyPair to enable SSH access to the instances",
      "Type" : "String",
      "MinLength": "1",
      "MaxLength": "64",
      "AllowedPattern" : "[-_ a-zA-Z0-9]*",
      "ConstraintDescription" : "can contain only alphanumeric characters, spaces, dashes and underscores."
    },

    "SSHFrom" : {
      "Description": "Lockdown SSH access to NAT instance (default can be accessed from anywhere)",
      "Type": "String",
      "MinLength": "9",
      "MaxLength": "18",
      "Default": "0.0.0.0/0",
      "AllowedPattern": "(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})/(\\d{1,2})",
      "ConstraintDescription": "must be a valid CIDR range of the form x.x.x.x/x."
    }
  },

  "Mappings" : {
  
  },

  "Resources" : {

    "VPC" : {
      "Type" : "AWS::EC2::VPC",
      "Properties" : {
        "CidrBlock" : "192.168.0.0/16",
        "EnableDnsSupport" : true,
        "EnableDnsHostnames" : true,
        "Tags" : [
          {"Key" : "Name", "Value" : { "Ref" : "AWS::StackName"} },
          {"Key" : "Application", "Value" : { "Ref" : "AWS::StackName"} },
          {"Key" : "Network", "Value" : "Public" }
        ]
      }
    },

    "PublicSubnet" : {
      "Type" : "AWS::EC2::Subnet",
      "Properties" : {
        "VpcId" : { "Ref" : "VPC" },
        "CidrBlock" : "192.168.1.0/24",
        "Tags" : [
          {"Key" : "Application", "Value" : { "Ref" : "AWS::StackName"} },
          {"Key" : "Network", "Value" : "Public" }
        ]
      }
    },

    "InternetGateway" : {
      "Type" : "AWS::EC2::InternetGateway",
      "Properties" : {
        "Tags" : [
          {"Key" : "Application", "Value" : { "Ref" : "AWS::StackName"} },
          {"Key" : "Network", "Value" : "Public" }
        ]
      }
    },

    "AttachGateway" : {
      "Type" : "AWS::EC2::VPCGatewayAttachment",
      "Properties" : {
         "VpcId" : { "Ref" : "VPC" },
         "InternetGatewayId" : { "Ref" : "InternetGateway" }
      }
    },

    "PublicRouteTable" : {
      "Type" : "AWS::EC2::RouteTable",
      "Properties" : {
        "VpcId" : {"Ref" : "VPC"},
        "Tags" : [
          {"Key" : "Application", "Value" : { "Ref" : "AWS::StackName"} },
          {"Key" : "Network", "Value" : "Public" }
        ]
      }
    },

    "PublicRoute" : {
      "Type" : "AWS::EC2::Route",
      "Properties" : {
        "RouteTableId" : { "Ref" : "PublicRouteTable" },
        "DestinationCidrBlock" : "0.0.0.0/0",
        "GatewayId" : { "Ref" : "InternetGateway" }
      }
    },

    "PublicSubnetRouteTableAssociation" : {
      "Type" : "AWS::EC2::SubnetRouteTableAssociation",
      "Properties" : {
        "SubnetId" : { "Ref" : "PublicSubnet" },
        "RouteTableId" : { "Ref" : "PublicRouteTable" }
      }
    }
  },

  "Outputs" : {

    "VpcID" : {
      "Value" : {"Ref" : "VPC"},
      "Description" : "VPC ID of newly created VPC"
    },

    "PublicSubnetID" :  {
      "Value" : {"Ref" : "PublicSubnet"},
      "Description" : "Public subnet ID"
    }
  }
}