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Module: vpc

Terraform module to provision a VPC with Internet Gateway. Contains a submodule for provisioning Interface and/or Gateway VPC Endpoints. This module also supports provisioning additional CIDR blocks for the VPC, with or without using IPAM.

Examples​

module "vpc" {
  source = "cloudposse/vpc/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version = "x.x.x"
  namespace = "eg"
  stage     = "test"
  name      = "app"

  ipv4_primary_cidr_block = "10.0.0.0/16"

  assign_generated_ipv6_cidr_block = true
}

Full example with terraform-aws-dynamic-subnets:

module "vpc" {
  source = "cloudposse/vpc/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version     = "x.x.x"
  namespace = "eg"
  stage     = "test"
  name      = "app"

  ipv4_primary_cidr_block = "10.0.0.0/16"

  assign_generated_ipv6_cidr_block = false
}

module "dynamic_subnets" {
  source = "cloudposse/dynamic-subnets/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version     = "x.x.x"
  namespace          = "eg"
  stage              = "test"
  name               = "app"
  availability_zones = ["us-west-2a","us-west-2b","us-west-2c"]
  vpc_id             = module.vpc.vpc_id
  igw_id             = [module.vpc.igw_id]
  cidr_block         = "10.0.0.0/16"
}

Submodule for provisioning VPC Endpoints:

module "vpc_endpoints" {
  source = "cloudposse/vpc/aws//modules/vpc-endpoints"
  # Cloud Posse recommends pinning every module to a specific version
  # version     = "x.x.x"

  vpc_id = module.vpc.vpc_id

  gateway_vpc_endpoints = {
    "s3" = {
      name = "s3"
      policy = jsonencode({
        Version = "2012-10-17"
        Statement = [
          {
            Action = [
              "s3:*",
            ]
            Effect    = "Allow"
            Principal = "*"
            Resource  = "*"
          },
        ]
      })
    }
  }
  interface_vpc_endpoints = {
    "ec2" = {
      name                = "ec2"
      security_group_ids  = ["sg-12341234123412345"]
      subnet_ids          = module.dynamic_subnets.private_subnet_ids
      policy              = null
      private_dns_enabled = false
    }
  }
}

Variables​

Required Variables​

Optional Variables​

assign_generated_ipv6_cidr_block (bool) optional

When true, assign AWS generated IPv6 CIDR block to the VPC. Conflicts with ipv6_ipam_pool_id.


Default value: true

default_network_acl_deny_all (bool) optional

When true, manage the default network acl and remove all rules, disabling all ingress and egress.
When false, do not mange the default networking acl, allowing it to be managed by another component.



Default value: false

default_route_table_no_routes (bool) optional

When true, manage the default route table and remove all routes, disabling all ingress and egress.
When false, do not mange the default route table, allowing it to be managed by another component.
Conflicts with Terraform resource aws_main_route_table_association.



Default value: false

default_security_group_deny_all (bool) optional

When true, manage the default security group and remove all rules, disabling all ingress and egress.
When false, do not manage the default security group, allowing it to be managed by another component.



Default value: true

dns_hostnames_enabled (bool) optional

Set true to enable DNS hostnames in the VPC


Default value: true

dns_support_enabled (bool) optional

Set true to enable DNS resolution in the VPC through the Amazon provided DNS server


Default value: true

instance_tenancy (string) optional

A tenancy option for instances launched into the VPC


Default value: "default"

internet_gateway_enabled (bool) optional

Set true to create an Internet Gateway for the VPC


Default value: true

ipv4_additional_cidr_block_associations optional

IPv4 CIDR blocks to assign to the VPC.
ipv4_cidr_block can be set explicitly, or set to null with the CIDR block derived from ipv4_ipam_pool_id using ipv4_netmask_length.
Map keys must be known at plan time, and are only used to track changes.



Type:

map(object({
ipv4_cidr_block     = string
ipv4_ipam_pool_id   = string
ipv4_netmask_length = number
}))

Default value: { }

ipv4_cidr_block_association_timeouts optional

Timeouts (in go duration format) for creating and destroying IPv4 CIDR block associations


Type:

object({
create = string
delete = string
})

Default value: null

ipv4_primary_cidr_block (string) optional

The primary IPv4 CIDR block for the VPC.
Either ipv4_primary_cidr_block or ipv4_primary_cidr_block_association must be set, but not both.



Default value: null

ipv4_primary_cidr_block_association optional

Configuration of the VPC's primary IPv4 CIDR block via IPAM. Conflicts with ipv4_primary_cidr_block.
One of ipv4_primary_cidr_block or ipv4_primary_cidr_block_association must be set.
Additional CIDR blocks can be set via ipv4_additional_cidr_block_associations.



Type:

object({
ipv4_ipam_pool_id   = string
ipv4_netmask_length = number
})

Default value: null

ipv6_additional_cidr_block_associations optional

IPv6 CIDR blocks to assign to the VPC (in addition to the autogenerated one).
ipv6_cidr_block can be set explicitly, or set to null with the CIDR block derived from ipv6_ipam_pool_id using ipv6_netmask_length.
Map keys must be known at plan time and are used solely to prevent unnecessary changes.



Type:

map(object({
ipv6_cidr_block     = string
ipv6_ipam_pool_id   = string
ipv6_netmask_length = number
}))

Default value: { }

ipv6_cidr_block_association_timeouts optional

Timeouts (in go duration format) for creating and destroying IPv6 CIDR block associations


Type:

object({
create = string
delete = string
})

Default value: null

ipv6_cidr_block_network_border_group (string) optional

Set this to restrict advertisement of public addresses to a specific Network Border Group such as a LocalZone.
Requires assign_generated_ipv6_cidr_block to be set to true.



Default value: null

ipv6_egress_only_internet_gateway_enabled (bool) optional

Set true to create an IPv6 Egress-Only Internet Gateway for the VPC


Default value: false

ipv6_primary_cidr_block_association optional

Primary IPv6 CIDR block to assign to the VPC. Conflicts with assign_generated_ipv6_cidr_block.
ipv6_cidr_block can be set explicitly, or set to null with the CIDR block derived from ipv6_ipam_pool_id using ipv6_netmask_length.



Type:

object({
ipv6_cidr_block     = string
ipv6_ipam_pool_id   = string
ipv6_netmask_length = number
})

Default value: null

network_address_usage_metrics_enabled (bool) optional

Set true to enable Network Address Usage Metrics for the VPC


Default value: false

Context Variables​

The following variables are defined in the context.tf file of this module and part of the terraform-null-label pattern.

additional_tag_map (map(string)) optional

Additional key-value pairs to add to each map in tags_as_list_of_maps. Not added to tags or id.
This is for some rare cases where resources want additional configuration of tags
and therefore take a list of maps with tag key, value, and additional configuration.


Required: No

Default value: { }

attributes (list(string)) optional

ID element. Additional attributes (e.g. workers or cluster) to add to id,
in the order they appear in the list. New attributes are appended to the
end of the list. The elements of the list are joined by the delimiter
and treated as a single ID element.


Required: No

Default value: [ ]

context (any) optional

Single object for setting entire context at once.
See description of individual variables for details.
Leave string and numeric variables as null to use default value.
Individual variable settings (non-null) override settings in context object,
except for attributes, tags, and additional_tag_map, which are merged.


Required: No

Default value:

{
  "additional_tag_map": {},
  "attributes": [],
  "delimiter": null,
  "descriptor_formats": {},
  "enabled": true,
  "environment": null,
  "id_length_limit": null,
  "label_key_case": null,
  "label_order": [],
  "label_value_case": null,
  "labels_as_tags": [
    "unset"
  ],
  "name": null,
  "namespace": null,
  "regex_replace_chars": null,
  "stage": null,
  "tags": {},
  "tenant": null
}
delimiter (string) optional

Delimiter to be used between ID elements.
Defaults to - (hyphen). Set to "" to use no delimiter at all.


Required: No

Default value: null

descriptor_formats (any) optional

Describe additional descriptors to be output in the descriptors output map.
Map of maps. Keys are names of descriptors. Values are maps of the form
\{<br/> format = string<br/> labels = list(string)<br/> \}
(Type is any so the map values can later be enhanced to provide additional options.)
format is a Terraform format string to be passed to the format() function.
labels is a list of labels, in order, to pass to format() function.
Label values will be normalized before being passed to format() so they will be
identical to how they appear in id.
Default is {} (descriptors output will be empty).


Required: No

Default value: { }

enabled (bool) optional

Set to false to prevent the module from creating any resources
Required: No

Default value: null

environment (string) optional

ID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT'
Required: No

Default value: null

id_length_limit (number) optional

Limit id to this many characters (minimum 6).
Set to 0 for unlimited length.
Set to null for keep the existing setting, which defaults to 0.
Does not affect id_full.


Required: No

Default value: null

label_key_case (string) optional

Controls the letter case of the tags keys (label names) for tags generated by this module.
Does not affect keys of tags passed in via the tags input.
Possible values: lower, title, upper.
Default value: title.


Required: No

Default value: null

label_order (list(string)) optional

The order in which the labels (ID elements) appear in the id.
Defaults to ["namespace", "environment", "stage", "name", "attributes"].
You can omit any of the 6 labels ("tenant" is the 6th), but at least one must be present.


Required: No

Default value: null

label_value_case (string) optional

Controls the letter case of ID elements (labels) as included in id,
set as tag values, and output by this module individually.
Does not affect values of tags passed in via the tags input.
Possible values: lower, title, upper and none (no transformation).
Set this to title and set delimiter to "" to yield Pascal Case IDs.
Default value: lower.


Required: No

Default value: null

labels_as_tags (set(string)) optional

Set of labels (ID elements) to include as tags in the tags output.
Default is to include all labels.
Tags with empty values will not be included in the tags output.
Set to [] to suppress all generated tags.
Notes:
The value of the name tag, if included, will be the id, not the name.
Unlike other null-label inputs, the initial setting of labels_as_tags cannot be
changed in later chained modules. Attempts to change it will be silently ignored.


Required: No

Default value:

[
  "default"
]
name (string) optional

ID element. Usually the component or solution name, e.g. 'app' or 'jenkins'.
This is the only ID element not also included as a tag.
The "name" tag is set to the full id string. There is no tag with the value of the name input.


Required: No

Default value: null

namespace (string) optional

ID element. Usually an abbreviation of your organization name, e.g. 'eg' or 'cp', to help ensure generated IDs are globally unique
Required: No

Default value: null

regex_replace_chars (string) optional

Terraform regular expression (regex) string.
Characters matching the regex will be removed from the ID elements.
If not set, "/[^a-zA-Z0-9-]/" is used to remove all characters other than hyphens, letters and digits.


Required: No

Default value: null

stage (string) optional

ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release'
Required: No

Default value: null

tags (map(string)) optional

Additional tags (e.g. {'BusinessUnit': 'XYZ'}).
Neither the tag keys nor the tag values will be modified by this module.


Required: No

Default value: { }

tenant (string) optional

ID element (Rarely used, not included by default). A customer identifier, indicating who this instance of a resource is for
Required: No

Default value: null

Outputs​

additional_cidr_blocks

A list of the additional IPv4 CIDR blocks associated with the VPC

additional_cidr_blocks_to_association_ids

A map of the additional IPv4 CIDR blocks to VPC CIDR association IDs

additional_ipv6_cidr_blocks

A list of the additional IPv6 CIDR blocks associated with the VPC

additional_ipv6_cidr_blocks_to_association_ids

A map of the additional IPv6 CIDR blocks to VPC CIDR association IDs

igw_id

The ID of the Internet Gateway

ipv6_cidr_block_network_border_group

The IPv6 Network Border Group Zone name

ipv6_egress_only_igw_id

The ID of the egress-only Internet Gateway

vpc_arn

The ARN of the VPC

vpc_cidr_block

The primary IPv4 CIDR block of the VPC

vpc_default_network_acl_id

The ID of the network ACL created by default on VPC creation

vpc_default_route_table_id

The ID of the route table created by default on VPC creation

vpc_default_security_group_id

The ID of the security group created by default on VPC creation

vpc_id

The ID of the VPC

vpc_ipv6_association_id

The association ID for the primary IPv6 CIDR block

vpc_ipv6_cidr_block

The primary IPv6 CIDR block

vpc_main_route_table_id

The ID of the main route table associated with this VPC

Dependencies​

Requirements​

  • terraform, version: >= 1.0.0
  • aws, version: >= 4.9.0

Providers​

  • aws, version: >= 4.9.0

Modules​

NameVersionSourceDescription
eigw_label0.25.0cloudposse/label/nulln/a
igw_label0.25.0cloudposse/label/nulln/a
label0.25.0cloudposse/label/nulln/a
this0.25.0cloudposse/label/nulln/a

Resources​

The following resources are used by this module:

Data Sources​

The following data sources are used by this module: