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Component: tgw/spoke

This component is responsible for provisioning AWS Transit Gateway attachments to connect VPCs in a spoke account to different accounts through a central hub.

Usage

Stack Level: Regional

Here's an example snippet for how to configure and use this component:

stacks/catalog/tgw/spoke.yaml

components:
  terraform:
    tgw/spoke-defaults:
      metadata:
        type: abstract
        component: tgw/spoke
      vars:
        enabled: true
        name: tgw-spoke
        tags:
          Team: sre
          Service: tgw-spoke
        expose_eks_sg: false
        tgw_hub_tenant_name: core
        tgw_hub_environment_name: ue1

    tgw/spoke:
      metadata:
        inherits:
          - tgw/spoke-defaults
      vars:
        # This is what THIS spoke is allowed to connect to.
        # since this is deployed to each plat account (dev->prod),
        # we allow connections to network and auto.
        connections:
          - account:
              tenant: core
              stage: network
            # Set this value if the vpc component has a different name in this account
            vpc_component_names:
              - vpc-dev
          - account:
              tenant: core
              stage: auto

stacks/ue2/dev.yaml

import:
  - catalog/tgw/spoke

components:
  terraform:
    tgw/spoke:
      vars:
        # use when there is not an EKS cluster in the stack
        expose_eks_sg: false
        # override default connections
        connections:
          - account:
              tenant: core
              stage: network
            vpc_component_names:
              - vpc-dev
          - account:
              tenant: core
              stage: auto
          - account:
              tenant: plat
              stage: dev
            eks_component_names:
              - eks/cluster
          - account:
              tenant: plat
              stage: qa
            eks_component_names:
              - eks/cluster

To provision the attachments for a spoke account:

atmos terraform plan tgw/spoke -s <tenant>-<environment>-<stage>
atmos terraform apply tgw/spoke -s <tenant>-<environment>-<stage>

Requirements

Name Version
terraform >= 1.0.0
aws >= 4.1

Providers

Name Version
aws >= 4.1
aws.tgw-hub >= 4.1

Modules

Name Source Version
cross_region_hub_connector cloudposse/stack-config/yaml//modules/remote-state 1.5.0
iam_roles ../../account-map/modules/iam-roles n/a
tgw_hub cloudposse/stack-config/yaml//modules/remote-state 1.5.0
tgw_hub_role ../../account-map/modules/iam-roles n/a
tgw_hub_routes cloudposse/transit-gateway/aws 0.10.0
tgw_spoke_vpc_attachment ./modules/standard_vpc_attachment n/a
this cloudposse/label/null 0.25.0
vpc cloudposse/stack-config/yaml//modules/remote-state 1.5.0

Resources

Name Type
aws_route.back_route resource
aws_route.default_route resource

Inputs

Name Description Type Default Required
additional_tag_map 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.		 map(string) {} no
attributes 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.		 list(string) [] no
connections A list of objects to define each TGW connections.

By default, each connection will look for only the default vpc component.		 
list(object({
    account = object({
      stage       = string
      environment = optional(string, "")
      tenant      = optional(string, "")
    })
    vpc_component_names = optional(list(string), ["vpc"])
    eks_component_names = optional(list(string), [])
  }))
 [] no
context 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.		 any 
{
  "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
}
 no
cross_region_hub_connector_components A map of cross-region hub connector components that provide this spoke with the appropriate Transit Gateway attachments IDs.
- The key should be the environment that the remote VPC is located in.
- The component is the name of the compoent in the remote region (e.g. tgw/cross-region-hub-connector)
- The environment is the region that the cross-region-hub-connector is deployed in.
e.g. the following would configure a component called tgw/cross-region-hub-connector/use1 that is deployed in the
If use2 is the primary region, the following would be its configuration:
use1:
component: "tgw/cross-region-hub-connector"
environment: "use1" (the remote region)
and in the alternate region, the following would be its configuration:
use2:
component: "tgw/cross-region-hub-connector"
environment: "use1" (our own region)		 map(object({ component = string, environment = string })) {} no
default_route_enabled Enable default routing via transit gateway, requires also nat gateway and instance to be disabled in vpc component. Default is disabled. bool false no
default_route_outgoing_account_name The account name which is used for outgoing traffic, when using the transit gateway as default route. string null no
delimiter Delimiter to be used between ID elements.
Defaults to - (hyphen). Set to "" to use no delimiter at all.		 string null no
descriptor_formats 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).		 any {} no
enabled Set to false to prevent the module from creating any resources bool null no
environment ID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT' string null no
expose_eks_sg Set true to allow EKS clusters to accept traffic from source accounts bool true no
id_length_limit 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.		 number null no
label_key_case 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.		 string null no
label_order 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.		 list(string) null no
label_value_case 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.		 string null no
labels_as_tags 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.		 set(string) 
[
  "default"
]
 no
name 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.		 string null no
namespace ID element. Usually an abbreviation of your organization name, e.g. 'eg' or 'cp', to help ensure generated IDs are globally unique string null no
own_eks_component_names The name of the eks components in the owning account. list(string) [] no
own_vpc_component_name The name of the vpc component in the owning account. Defaults to "vpc" string "vpc" no
peered_region Set true if this region is not the primary region bool false no
regex_replace_chars 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.		 string null no
region AWS Region string n/a yes
stage ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release' string null no
static_routes A list of static routes to add to the transit gateway, pointing at this VPC as a destination. 
set(object({
    blackhole              = bool
    destination_cidr_block = string
  }))
 [] no
static_tgw_routes A list of static routes to add to the local routing table with the transit gateway as a destination. list(string) [] no
tags Additional tags (e.g. {'BusinessUnit': 'XYZ'}).
Neither the tag keys nor the tag values will be modified by this module.		 map(string) {} no
tenant ID element _(Rarely used, not included by default)_. A customer identifier, indicating who this instance of a resource is for string null no
tgw_hub_component_name The name of the transit-gateway component string "tgw/hub" no
tgw_hub_stage_name The name of the stage where tgw/hub is provisioned string "network" no
tgw_hub_tenant_name The name of the tenant where tgw/hub is provisioned.

If the tenant label is not used, leave this as null.		 string null no

Outputs

No outputs.

References