lab1-nat_stack.json

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

  "Description" : "Builds a NAT host. **WARNING** This template creates Amazon EC2 instance(s). You will be billed for the AWS resources used if you create a stack from this template.",

  "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."
    },

    "VpcId" : {
      "Type" : "String",
      "Description" : "VpcId of your existing Virtual Private Cloud (VPC)"
    },

    "SubnetId" : {
      "Type" : "String",
      "Description" : "SubnetId of an existing Public facing subnet in your Virtual Private Cloud (VPC)"
    }
  },

  "Mappings" : {
    "AWSNATAMI": {
      "us-east-1": {"AMI": "ami-6e9e4b06"},
      "us-west-2": {"AMI": "ami-8b6912bb"},
      "us-west-1": {"AMI": "ami-1d2b2958"},
      "eu-west-1": {"AMI": "ami-14913f63"},
      "ap-northeast-1": {"AMI": "ami-27d6e626"}
    }
  },

  "Resources" : {

    "NATIPAddress" : {
      "Type" : "AWS::EC2::EIP",
      "Properties" : {
        "Domain" : "vpc",
        "InstanceId" : { "Ref" : "NATDevice" }
      }
    },

    "NATDevice" : {
      "Type" : "AWS::EC2::Instance",
      "Properties" : {
        "InstanceType" : "m3.medium",
        "KeyName" : { "Ref" : "KeyName" },
        "SubnetId" : { "Ref" : "SubnetId" },
        "SourceDestCheck" : "false",
        "ImageId" : { "Fn::FindInMap" : [ "AWSNATAMI", { "Ref" : "AWS::Region" }, "AMI" ]},
        "SecurityGroupIds" : [{ "Ref" : "NATSecurityGroup" }]
      }
    },

    "NATSecurityGroup" : {
      "Type" : "AWS::EC2::SecurityGroup",
      "Properties" : {
        "GroupDescription" : "Enable internal access to the NAT device",
        "VpcId" : { "Ref" : "VpcId" },
        "SecurityGroupIngress" : [
          { "IpProtocol" : "tcp", "FromPort" : "0",  "ToPort" : "65535",  "CidrIp" : "192.168.0.0/16" },
          { "IpProtocol" : "udp", "FromPort" : "0", "ToPort" : "65535", "CidrIp" : "192.168.0.0/16" } ,
          { "IpProtocol" : "icmp", "FromPort" : "-1",  "ToPort" : "-1",  "CidrIp" : "192.168.0.0/16" }
        ],
        "SecurityGroupEgress" : [
          { "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" },
          { "IpProtocol" : "tcp", "FromPort" : "9418", "ToPort" : "9418", "CidrIp" : "0.0.0.0/0" },
          { "IpProtocol" : "tcp", "FromPort" : "0", "ToPort" : "65535", "CidrIp" : "192.168.0.0/16" },
          { "IpProtocol" : "udp", "FromPort" : "123", "ToPort" : "123", "CidrIp" : "0.0.0.0/0" },
          { "IpProtocol" : "icmp", "FromPort" : "-1",  "ToPort" : "-1",  "CidrIp" : "0.0.0.0/0" }
        ]
      }
    },

    "PrivateRouteTable" : {
      "Type" : "AWS::EC2::RouteTable",
      "Properties" : {
        "VpcId" : {"Ref" : "VpcId"},
        "Tags" : [
          {"Key" : "Application", "Value" : { "Ref" : "AWS::StackName"} },
          {"Key" : "Network", "Value" : "Private Route" }
        ]
      }
    },

    "PrivateRoute" : {
      "Type" : "AWS::EC2::Route",
      "Properties" : {
        "RouteTableId" : { "Ref" : "PrivateRouteTable" },
        "DestinationCidrBlock" : "0.0.0.0/0",
        "InstanceId" : { "Ref" : "NATDevice" }
      }
    }
  },

  "Outputs" : {

    "PrivateRouteTableId" : {
      "Value" : {"Ref" : "PrivateRouteTable"},
      "Description" : "Private Route Table ID"
    }
  }
}