Class: Enscalator::Templates::VPCWithNATGateway

Inherits:
RichTemplateDSL
  • Object
show all
Includes:
Plugins::NATGateway
Defined in:
lib/enscalator/vpc_with_nat_gateway.rb

Overview

Amazon AWS Virtual Private Cloud template with NAT gateway

Direct Known Subclasses

VPC

Constant Summary collapse

SUBNET_CIDR_BLOCK_SIZE =

Subnet size (256 addresses)

24

Constants inherited from RichTemplateDSL

RichTemplateDSL::TEMPLATE_BODY_LIMIT

Constants included from Plugins::Route53

Plugins::Route53::HEALTH_CHECK_TYPE, Plugins::Route53::RECORD_TYPE

Instance Method Summary collapse

Methods included from Plugins::NATGateway

#add_route_rule, #allocate_new_eip, #nat_gateway_init

Methods inherited from RichTemplateDSL

#availability_zones, #creating?, #deploy, #deployment_env, #description, #enqueue, #exec!, #handle_trailing_dot, #has_multiple_envs, #hosted_zone, #initialize, #network_interface, #parameter, #parse_params, #post_run, #pre_run, #private_hosted_zone, #public_hosted_zone, #read_availability_zones, #region, #resource, #tags_to_properties, #vpc_stack_name

Methods included from Plugins::Route53

#create_healthcheck, #create_multiple_dns_records, #create_private_hosted_zone, #create_public_hosted_zone, #create_single_dns_record

Methods included from Helpers

#cfn_call_script, #create_ssh_key, #find_ami, #flatten_hash, #gen_ssh_key_name, #init_assets_dir, #init_aws_config, #read_user_data, #run_cmd

Methods included from Helpers::Dns

#get_dns_records, #upsert_dns_record

Methods included from Helpers::Stack

#cfn_create_stack, #generate_parameters, #get_resource, #get_resources, #wait_stack

Methods included from Helpers::Wrappers

#cfn_client, #cfn_resource, #ec2_client, #route53_client

Methods included from Core::CfResources

#iam_instance_profile_with_full_access, #instance_vpc, #instance_with_network, #security_group, #security_group_vpc, #subnet, #vpc

Methods included from Core::CfParameters

#parameter_allocated_storage, #parameter_ami, #parameter_ec2_instance_type, #parameter_instance_type, #parameter_key_name, #parameter_name, #parameter_password, #parameter_rds_instance_type, #parameter_username

Constructor Details

This class inherits a constructor from Enscalator::RichTemplateDSL

Instance Method Details

#tpl ⇒ Object

Template method



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# File 'lib/enscalator/vpc_with_nat_gateway.rb', line 11

def tpl
  description = <<-EOS.gsub(/^\s+\|/, '')
    |AWS CloudFormation template for the VPC environment.
    |For each availability zone stack creates: the public subnet, internet and NAT gateways,
    |internet access from private subnets, routing configuration for corresponding subnets
    |and security groups.
  EOS

  value Description: description

  mapping 'AWSRegionNetConfig', Core::NetworkConfig.mapping_vpc_net

  resource 'VPC',
           Type: 'AWS::EC2::VPC',
           Properties: {
             CidrBlock: find_in_map('AWSRegionNetConfig', ref('AWS::Region'), 'VPC'),
             EnableDnsSupport: 'true',
             EnableDnsHostnames: 'true',
             Tags: [
               {
                 Key: 'Name',
                 Value: aws_stack_name
               },
               {
                 Key: 'Application',
                 Value: aws_stack_name
               },
               {
                 Key: 'Network',
                 Value: 'Public'
               }
             ]
           }

  resource 'InternetGateway',
           Type: 'AWS::EC2::InternetGateway',
           Properties: {
             Tags: [
               {
                 Key: 'Name',
                 Value: 'Public Gateway'
               },
               {
                 Key: 'Application',
                 Value: aws_stack_name
               },
               {
                 Key: 'Network',
                 Value: 'Public'
               }
             ]
           }

  resource 'GatewayToInternet',
           DependsOn: %w( VPC InternetGateway ),
           Type: 'AWS::EC2::VPCGatewayAttachment',
           Properties: {
             VpcId: ref('VPC'),
             InternetGatewayId: ref('InternetGateway')
           }

  resource 'PublicRouteTable',
           DependsOn: ['VPC'],
           Type: 'AWS::EC2::RouteTable',
           Properties: {
             VpcId: ref('VPC'),
             Tags: [
               {
                 Key: 'Name',
                 Value: 'Public'
               },
               {
                 Key: 'Application',
                 Value: aws_stack_name
               },
               {
                 Key: 'Network',
                 Value: 'Public'
               }
             ]
           }

  resource 'PublicRoute',
           DependsOn: %w( PublicRouteTable InternetGateway ),
           Type: 'AWS::EC2::Route',
           Properties: {
             RouteTableId: ref('PublicRouteTable'),
             DestinationCidrBlock: '0.0.0.0/0',
             GatewayId: ref('InternetGateway')
           }

  resource 'PublicNetworkAcl',
           DependsOn: ['VPC'],
           Type: 'AWS::EC2::NetworkAcl',
           Properties: {
             VpcId: ref('VPC'),
             Tags: [
               {
                 Key: 'Name',
                 Value: 'Public'
               },
               {
                 Key: 'Application',
                 Value: aws_stack_name
               },
               {
                 Key: 'Network',
                 Value: 'Public'
               }
             ]
           }

  resource 'InboundHTTPPublicNetworkAclEntry',
           DependsOn: ['PublicNetworkAcl'],
           Type: 'AWS::EC2::NetworkAclEntry',
           Properties: {
             NetworkAclId: ref('PublicNetworkAcl'),
             RuleNumber: '100',
             Protocol: '-1',
             RuleAction: 'allow',
             Egress: 'false',
             CidrBlock: '0.0.0.0/0',
             PortRange: { From: '0', To: '65535' }
           }

  resource 'OutboundHTTPPublicNetworkAclEntry',
           DependsOn: ['PublicNetworkAcl'],
           Type: 'AWS::EC2::NetworkAclEntry',
           Properties: {
             NetworkAclId: ref('PublicNetworkAcl'),
             RuleNumber: '100',
             Protocol: '-1',
             RuleAction: 'allow',
             Egress: 'true',
             CidrBlock: '0.0.0.0/0',
             PortRange: { From: '0', To: '65535' }
           }

  resource 'PrivateNetworkAcl',
           DependsOn: ['VPC'],
           Type: 'AWS::EC2::NetworkAcl',
           Properties: {
             VpcId: ref('VPC'),
             Tags: [
               {
                 Key: 'Name',
                 Value: 'Private'
               },
               {
                 Key: 'Application',
                 Value: aws_stack_name
               },
               {
                 Key: 'Network',
                 Value: 'Private'
               }
             ]
           }

  resource 'InboundPrivateNetworkAclEntry',
           DependsOn: ['PrivateNetworkAcl'],
           Type: 'AWS::EC2::NetworkAclEntry',
           Properties: {
             NetworkAclId: ref('PrivateNetworkAcl'),
             RuleNumber: '100',
             Protocol: '6',
             RuleAction: 'allow',
             Egress: 'false',
             CidrBlock: '0.0.0.0/0',
             PortRange: { From: '0', To: '65535' }
           }

  resource 'OutBoundPrivateNetworkAclEntry',
           DependsOn: ['PrivateNetworkAcl'],
           Type: 'AWS::EC2::NetworkAclEntry',
           Properties: {
             NetworkAclId: ref('PrivateNetworkAcl'),
             RuleNumber: '100',
             Protocol: '6',
             RuleAction: 'allow',
             Egress: 'true',
             CidrBlock: '0.0.0.0/0',
             PortRange: { From: '0', To: '65535' }
           }

  resource 'PrivateSecurityGroup',
           DependsOn: ['VPC'],
           Type: 'AWS::EC2::SecurityGroup',
           Properties: {
             GroupDescription: 'Allow the Application instances to access the NAT device',
             VpcId: ref('VPC'),
             SecurityGroupEgress: [
               {
                 IpProtocol: 'tcp',
                 FromPort: '0',
                 ToPort: '65535',
                 CidrIp: '10.0.0.0/8'
               }
             ],
             SecurityGroupIngress: [
               {
                 IpProtocol: 'tcp',
                 FromPort: '0',
                 ToPort: '65535',
                 CidrIp: '10.0.0.0/8'
               }
             ],
             Tags: [
               {
                 Key: 'Name',
                 Value: 'Private'
               }
             ]
           }

  current_cidr_block = Core::NetworkConfig.mapping_vpc_net[region.to_sym][:VPC]
  public_cidr_blocks =
    IPAddress(current_cidr_block).subnet(SUBNET_CIDR_BLOCK_SIZE).map(&:to_string).first(availability_zones.size)

  availability_zones.zip(public_cidr_blocks).each do |pair, cidr_block|
    suffix = pair.first
    public_subnet_name = "PublicSubnet#{suffix.upcase}"
    resource public_subnet_name,
             DependsOn: ['VPC'],
             Type: 'AWS::EC2::Subnet',
             Properties: {
               VpcId: ref('VPC'),
               AvailabilityZone: join('', ref('AWS::Region'), suffix.to_s),
               CidrBlock: cidr_block,
               Tags: [
                 {
                   Key: 'Name',
                   Value: "Public #{suffix.upcase}"
                 },
                 {
                   Key: 'Application',
                   Value: aws_stack_name
                 },
                 {
                   Key: 'Network',
                   Value: 'Public'
                 }
               ]
             }

    resource "PublicSubnetRouteTableAssociation#{suffix.upcase}",
             DependsOn: [public_subnet_name, 'PublicRouteTable'],
             Type: 'AWS::EC2::SubnetRouteTableAssociation',
             Properties: {
               SubnetId: ref(public_subnet_name),
               RouteTableId: ref('PublicRouteTable')
             }

    private_route_table_name = "PrivateRouteTable#{suffix.upcase}"
    resource private_route_table_name,
             DependsOn: ['VPC'],
             Type: 'AWS::EC2::RouteTable',
             Properties: {
               VpcId: ref('VPC'),
               Tags: [
                 {
                   Key: 'Name',
                   Value: "Private #{suffix.upcase}"
                 },
                 {
                   Key: 'Application',
                   Value: aws_stack_name
                 },
                 {
                   Key: 'Network',
                   Value: 'Private'
                 }
               ]
             }

    # Important!
    # When updating stack that was previously deployed using VPC template with NAT EC2 instance:
    # 1. Comment out lines related to NAT device below
    # 2. Update stack using this template (it will remove NAT instances and related security and routing rules)
    # 3. Revert changes from 1. (i.e. uncomment lines below)
    # 4. Update stack again (this time it will create new NAT Gateway, EIP and routing rule resources)
    nat_device_name = "NATDevice#{suffix.upcase}"
    nat_gateway_init(nat_device_name, public_subnet_name, private_route_table_name,
                     depends_on: [public_subnet_name, 'PublicRouteTable', 'GatewayToInternet'])

    output public_subnet_name,
           Description: "Created Subnet #{suffix.upcase}",
           Value: ref(public_subnet_name)
  end # each availability zone

  output 'VpcId',
         Description: 'Created VPC',
         Value: ref('VPC')

  output 'PrivateSecurityGroup',
         Description: 'SecurityGroup to add private resources',
         Value: ref('PrivateSecurityGroup')
end