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Terraform module to provision an HTTP style ingress rule based on hostname and path for an ALB using target groups

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Cloud Posse

Terraform module to provision an HTTP style ALB ingress based on hostname and/or path.

ALB ingress can be provisioned without authentication, or using Cognito or OIDC authentication.


This project is part of our comprehensive "SweetOps" approach towards DevOps.

Terraform Open Source Modules

It's 100% Open Source and licensed under the APACHE2.

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Usage

IMPORTANT: We do not pin modules to versions in our examples because of the difficulty of keeping the versions in the documentation in sync with the latest released versions. We highly recommend that in your code you pin the version to the exact version you are using so that your infrastructure remains stable, and update versions in a systematic way so that they do not catch you by surprise.

Also, because of a bug in the Terraform registry (hashicorp/terraform#21417), the registry shows many of our inputs as required when in fact they are optional. The table below correctly indicates which inputs are required.

For a complete example, see examples/complete.

For automated test of the complete example using bats and Terratest, see test.

  provider "aws" {
    region = var.region
  }

  module "vpc" {
    source     = "git::https://github.com/cloudposse/terraform-aws-vpc.git?ref=tags/0.8.1"
    namespace  = var.namespace
    stage      = var.stage
    name       = var.name
    delimiter  = var.delimiter
    attributes = var.attributes
    cidr_block = var.vpc_cidr_block
    tags       = var.tags
  }

  module "subnets" {
    source               = "git::https://github.com/cloudposse/terraform-aws-dynamic-subnets.git?ref=tags/0.16.1"
    availability_zones   = var.availability_zones
    namespace            = var.namespace
    stage                = var.stage
    name                 = var.name
    attributes           = var.attributes
    delimiter            = var.delimiter
    vpc_id               = module.vpc.vpc_id
    igw_id               = module.vpc.igw_id
    cidr_block           = module.vpc.vpc_cidr_block
    nat_gateway_enabled  = false
    nat_instance_enabled = false
    tags                 = var.tags
  }

  module "alb" {
    source                                  = "git::https://github.com/cloudposse/terraform-aws-alb.git?ref=tags/0.7.0"
    namespace                               = var.namespace
    stage                                   = var.stage
    name                                    = var.name
    attributes                              = var.attributes
    delimiter                               = var.delimiter
    vpc_id                                  = module.vpc.vpc_id
    security_group_ids                      = [module.vpc.vpc_default_security_group_id]
    subnet_ids                              = module.subnets.public_subnet_ids
    internal                                = var.internal
    http_enabled                            = var.http_enabled
    access_logs_enabled                     = var.access_logs_enabled
    alb_access_logs_s3_bucket_force_destroy = var.alb_access_logs_s3_bucket_force_destroy
    cross_zone_load_balancing_enabled       = var.cross_zone_load_balancing_enabled
    http2_enabled                           = var.http2_enabled
    idle_timeout                            = var.idle_timeout
    ip_address_type                         = var.ip_address_type
    deletion_protection_enabled             = var.deletion_protection_enabled
    deregistration_delay                    = var.deregistration_delay
    health_check_path                       = var.health_check_path
    health_check_timeout                    = var.health_check_timeout
    health_check_healthy_threshold          = var.health_check_healthy_threshold
    health_check_unhealthy_threshold        = var.health_check_unhealthy_threshold
    health_check_interval                   = var.health_check_interval
    health_check_matcher                    = var.health_check_matcher
    target_group_port                       = var.target_group_port
    target_group_target_type                = var.target_group_target_type
    tags                                    = var.tags
  }

  module "alb_ingress" {
    source                              = "git::https://github.com/cloudposse/terraform-aws-alb-ingress.git?ref=master"
    namespace                           = var.namespace
    stage                               = var.stage
    name                                = var.name
    attributes                          = var.attributes
    delimiter                           = var.delimiter
    vpc_id                              = module.vpc.vpc_id
    authentication_type                 = var.authentication_type
    unauthenticated_priority            = var.unauthenticated_priority
    unauthenticated_paths               = var.unauthenticated_paths
    slow_start                          = var.slow_start
    stickiness_enabled                  = var.stickiness_enabled
    default_target_group_enabled        = false
    target_group_arn                    = module.alb.default_target_group_arn
    unauthenticated_listener_arns       = [module.alb.http_listener_arn]
    unauthenticated_listener_arns_count = 1
    tags                                = var.tags
  }

Makefile Targets

Available targets:

  help                                Help screen
  help/all                            Display help for all targets
  help/short                          This help short screen
  lint                                Lint terraform code

Requirements

Name Version
terraform >= 0.12.0
aws >= 2.42
local >= 1.3
null >= 2.0
template >= 2.0

Providers

Name Version
aws >= 2.42

Inputs

Name Description Type Default Required
additional_tag_map Additional tags for appending to tags_as_list_of_maps. Not added to tags. map(string) {} no
attributes Additional attributes (e.g. 1) list(string) [] no
authenticated_hosts Authenticated hosts to match in Hosts header list(string) [] no
authenticated_listener_arns A list of authenticated ALB listener ARNs to attach ALB listener rules to list(string) [] no
authenticated_listener_arns_count The number of authenticated ARNs in authenticated_listener_arns. This is necessary to work around a limitation in Terraform where counts cannot be computed number 0 no
authenticated_paths Authenticated path pattern to match (a maximum of 1 can be defined) list(string) [] no
authenticated_priority The priority for the rules with authentication, between 1 and 50000 (1 being highest priority). Must be different from unauthenticated_priority since a listener can't have multiple rules with the same priority number 0 no
authentication_cognito_scope Cognito scope list(string) [] no
authentication_cognito_user_pool_arn Cognito User Pool ARN string "" no
authentication_cognito_user_pool_client_id Cognito User Pool Client ID string "" no
authentication_cognito_user_pool_domain Cognito User Pool Domain. The User Pool Domain should be set to the domain prefix (xxx) instead of full domain (https://xxx.auth.us-west-2.amazoncognito.com) string "" no
authentication_oidc_authorization_endpoint OIDC Authorization Endpoint string "" no
authentication_oidc_client_id OIDC Client ID string "" no
authentication_oidc_client_secret OIDC Client Secret string "" no
authentication_oidc_issuer OIDC Issuer string "" no
authentication_oidc_scope OIDC scope list(string) [] no
authentication_oidc_token_endpoint OIDC Token Endpoint string "" no
authentication_oidc_user_info_endpoint OIDC User Info Endpoint string "" no
authentication_type Authentication type. Supported values are COGNITO and OIDC 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.
object({
enabled = bool
namespace = string
environment = string
stage = string
name = string
delimiter = string
attributes = list(string)
tags = map(string)
additional_tag_map = map(string)
regex_replace_chars = string
label_order = list(string)
id_length_limit = number
})
{
"additional_tag_map": {},
"attributes": [],
"delimiter": null,
"enabled": true,
"environment": null,
"id_length_limit": null,
"label_order": [],
"name": null,
"namespace": null,
"regex_replace_chars": null,
"stage": null,
"tags": {}
}
no
default_target_group_enabled Enable/disable creation of the default target group bool true no
delimiter Delimiter to be used between namespace, environment, stage, name and attributes.
Defaults to - (hyphen). Set to "" to use no delimiter at all.
string null no
deregistration_delay The amount of time to wait in seconds while deregistering target number 15 no
enabled Set to false to prevent the module from creating any resources bool null no
environment Environment, e.g. 'uw2', 'us-west-2', OR 'prod', 'staging', 'dev', 'UAT' string null no
health_check_enabled Indicates whether health checks are enabled. Defaults to true bool true no
health_check_healthy_threshold The number of consecutive health checks successes required before healthy number 2 no
health_check_interval The duration in seconds in between health checks number 15 no
health_check_matcher The HTTP response codes to indicate a healthy check string "200-399" no
health_check_path The destination for the health check request string "/" no
health_check_port The port to use to connect with the target. Valid values are either ports 1-65536, or traffic-port. Defaults to traffic-port string "traffic-port" no
health_check_protocol The protocol to use to connect with the target. Defaults to HTTP. Not applicable when target_type is lambda string "HTTP" no
health_check_timeout The amount of time to wait in seconds before failing a health check request number 10 no
health_check_unhealthy_threshold The number of consecutive health check failures required before unhealthy number 2 no
id_length_limit Limit id to this many characters.
Set to 0 for unlimited length.
Set to null for default, which is 0.
Does not affect id_full.
number null no
label_order The naming order of the id output and Name tag.
Defaults to ["namespace", "environment", "stage", "name", "attributes"].
You can omit any of the 5 elements, but at least one must be present.
list(string) null no
listener_http_header_conditions A list of http header conditions to apply to the listener.
list(object({
name = string
value = list(string)
}))
[] no
load_balancing_algorithm_type Determines how the load balancer selects targets when routing requests. Only applicable for Application Load Balancer Target Groups. The value is round_robin or least_outstanding_requests. The default is round_robin. string "round_robin" no
name Solution name, e.g. 'app' or 'jenkins' string null no
namespace Namespace, which could be your organization name or abbreviation, e.g. 'eg' or 'cp' string null no
port The port for the created ALB target group (if target_group_arn is not set) number 80 no
protocol The protocol for the created ALB target group (if target_group_arn is not set) string "HTTP" no
regex_replace_chars Regex to replace chars with empty string in namespace, environment, stage and name.
If not set, "/[^a-zA-Z0-9-]/" is used to remove all characters other than hyphens, letters and digits.
string null no
slow_start The amount of time for targets to warm up before the load balancer sends them a full share of requests. The range is 30-900 seconds or 0 to disable. The default value is 0 seconds number 0 no
stage Stage, e.g. 'prod', 'staging', 'dev', OR 'source', 'build', 'test', 'deploy', 'release' string null no
stickiness_cookie_duration The time period, in seconds, during which requests from a client should be routed to the same target. After this time period expires, the load balancer-generated cookie is considered stale. The range is 1 second to 1 week (604800 seconds). The default value is 1 day (86400 seconds) number 86400 no
stickiness_enabled Boolean to enable / disable stickiness. Default is true bool true no
stickiness_type The type of sticky sessions. The only current possible value is lb_cookie string "lb_cookie" no
tags Additional tags (e.g. map('BusinessUnit','XYZ') map(string) {} no
target_group_arn Existing ALB target group ARN. If provided, set default_target_group_enabled to false to disable creation of the default target group string "" no
target_type The type (instance, ip or lambda) of targets that can be registered with the target group string "ip" no
unauthenticated_hosts Unauthenticated hosts to match in Hosts header list(string) [] no
unauthenticated_listener_arns A list of unauthenticated ALB listener ARNs to attach ALB listener rules to list(string) [] no
unauthenticated_listener_arns_count The number of unauthenticated ARNs in unauthenticated_listener_arns. This is necessary to work around a limitation in Terraform where counts cannot be computed number 0 no
unauthenticated_paths Unauthenticated path pattern to match (a maximum of 1 can be defined) list(string) [] no
unauthenticated_priority The priority for the rules without authentication, between 1 and 50000 (1 being highest priority). Must be different from authenticated_priority since a listener can't have multiple rules with the same priority number 0 no
vpc_id The VPC ID where generated ALB target group will be provisioned (if target_group_arn is not set) string n/a yes

Outputs

Name Description
target_group_arn ALB Target Group ARN
target_group_arn_suffix ALB Target Group ARN suffix
target_group_name ALB Target Group name

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Related Projects

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  • terraform-aws-alb - Terraform module to create an ALB, default ALB listener(s), and a default ALB target and related security groups.

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Copyright

Copyright © 2017-2021 Cloud Posse, LLC

License

License

See LICENSE for full details.

Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

  https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
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Contributors

Erik Osterman
Erik Osterman
Igor Rodionov
Igor Rodionov
Andriy Knysh
Andriy Knysh
Sarkis Varozian
Sarkis Varozian

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Terraform module to provision an HTTP style ingress rule based on hostname and path for an ALB using target groups

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