Module: Enscalator::Plugins::NATGateway

Included in:
Templates::VPCWithNATGateway
Defined in:
lib/enscalator/plugins/nat_gateway.rb

Overview

VPC NAT Gateway plugin

Instance Method Summary collapse

Instance Method Details

#add_route_rule(name, route_table_name, nat_gateway_name, dest_cidr_block, depends_on: []) ⇒ Object

Create new route rule

Parameters:

  • name (String)

    route rule name

  • depends_on (Array<String>) (defaults to: [])

    list of resource names this resource depends on

[View source]

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# File 'lib/enscalator/plugins/nat_gateway.rb', line 31

def add_route_rule(name, route_table_name, nat_gateway_name, dest_cidr_block, depends_on: [])
  options = {
    Type: 'AWS::EC2::Route'
  }
  options[:DependsOn] = depends_on unless depends_on.blank?
  resource name,
           options.merge(
             Properties: {
               RouteTableId: ref(route_table_name),
               NatGatewayId: ref(nat_gateway_name),
               DestinationCidrBlock: dest_cidr_block
             })
end

#allocate_new_eip(name, depends_on: []) ⇒ Hash

Allocate new elastic IP in given VPC template

Parameters:

  • name (String)

    eip resource name

  • depends_on (Array<String>) (defaults to: [])

    list of resource names this resource depends on

Returns:

  • (Hash)

    result of Fn::GetAtt function

[View source]

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# File 'lib/enscalator/plugins/nat_gateway.rb', line 10

def allocate_new_eip(name, depends_on: [])
  fail('Dependency on the VPC-gateway attachment must be provided') if depends_on.empty?
  eip_resource_name = name
  resource eip_resource_name,
           DependsOn: depends_on,
           Type: 'AWS::EC2::EIP',
           Properties: {
             Domain: 'vpc'
           }

  output eip_resource_name,
         Description: 'Elastic IP address for NAT Gateway',
         Value: ref(eip_resource_name)

  get_att(eip_resource_name, 'AllocationId')
end

#nat_gateway_init(name, subnet_name, route_table_name, dest_cidr_block: '0.0.0.0/0', depends_on: []) ⇒ Object

Create new NAT gateway

[View source]

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# File 'lib/enscalator/plugins/nat_gateway.rb', line 46

def nat_gateway_init(name, subnet_name, route_table_name, dest_cidr_block: '0.0.0.0/0', depends_on: [])
  nat_gateway_eip_name = "#{name}EIP"
  nat_gateway_eip = allocate_new_eip(nat_gateway_eip_name, depends_on: depends_on)
  nat_gateway_name = name
  nat_gateway_options = {
    Type: 'AWS::EC2::NatGateway'
  }
  nat_gateway_options[:DependsOn] = depends_on unless depends_on.blank?
  resource nat_gateway_name,
           nat_gateway_options.merge(
             Properties: {
               AllocationId: nat_gateway_eip,
               SubnetId: ref(subnet_name)
             })
  nat_route_rule_name = "#{name}Route"
  add_route_rule(nat_route_rule_name, route_table_name, nat_gateway_name, dest_cidr_block, depends_on: depends_on)

  output nat_gateway_name,
         Description: 'NAT Gateway',
         Value: ref(nat_gateway_name)

  nat_gateway_name
end