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Terraform module to create an ALB, default ALB listener(s), and a default ALB target and related security groups.

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Usage

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  = "cloudposse/vpc/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version = "x.x.x"

  namespace  = var.namespace
  stage      = var.stage
  name       = var.name
  delimiter  = var.delimiter
  attributes = var.attributes

  ipv4_primary_cidr_block = "10.0.0.0/16"
  assign_generated_ipv6_cidr_block = true

  tags = var.tags
}

module "subnets" {
  source  = "cloudposse/dynamic-subnets/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version = "x.x.x"

  namespace  = var.namespace
  stage      = var.stage
  name       = var.name
  attributes = var.attributes
  delimiter  = var.delimiter

  availability_zones   = var.availability_zones
  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 = "cloudposse/alb/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version = "x.x.x"

  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
  http_redirect                           = var.http_redirect
  access_logs_enabled                     = var.access_logs_enabled
  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
  stickiness                              = var.stickiness

  alb_access_logs_s3_bucket_force_destroy         = var.alb_access_logs_s3_bucket_force_destroy
  alb_access_logs_s3_bucket_force_destroy_enabled = var.alb_access_logs_s3_bucket_force_destroy_enabled

  tags = var.tags
}

Important

In Cloud Posse's examples, we avoid pinning modules to specific versions to prevent discrepancies between the documentation and the latest released versions. However, for your own projects, we strongly advise pinning each module to the exact version you're using. This practice ensures the stability of your infrastructure. Additionally, we recommend implementing a systematic approach for updating versions to avoid unexpected changes.

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 >= 1.3
aws >= 5.46

Providers

Name Version
aws >= 5.46

Modules

Name Source Version
access_logs cloudposse/lb-s3-bucket/aws 0.19.0
default_load_balancer_label cloudposse/label/null 0.25.0
default_target_group_label cloudposse/label/null 0.25.0
this cloudposse/label/null 0.25.0

Resources

Name Type
aws_lb.default resource
aws_lb_listener.http_forward resource
aws_lb_listener.http_redirect resource
aws_lb_listener.https resource
aws_lb_listener_certificate.https_sni resource
aws_lb_target_group.default resource
aws_security_group.default resource
aws_security_group_rule.egress resource
aws_security_group_rule.http_ingress resource
aws_security_group_rule.https_ingress resource

Inputs

Name Description Type Default Required
access_logs_enabled A boolean flag to enable/disable access_logs bool true no
access_logs_prefix The S3 log bucket prefix string "" no
access_logs_s3_bucket_id An external S3 Bucket name to store access logs in. If specified, no logging bucket will be created. string null no
additional_certs A list of additonal certs to add to the https listerner list(string) [] no
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
alb_access_logs_s3_bucket_force_destroy A boolean that indicates all objects should be deleted from the ALB access logs S3 bucket so that the bucket can be destroyed without error bool false no
allow_ssl_requests_only Set to true to require requests to use Secure Socket Layer (HTTPS/SSL) on the access logs S3 bucket. This will explicitly deny access to HTTP requests bool false 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
certificate_arn The ARN of the default SSL certificate for HTTPS listener string "" no
client_keep_alive Client keep alive value in seconds. The valid range is 60-604800 seconds. The default is 3600 seconds. number 3600 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_zone_load_balancing_enabled A boolean flag to enable/disable cross zone load balancing bool true no
default_target_group_enabled Whether the default target group should be created or not. bool true no
deletion_protection_enabled A boolean flag to enable/disable deletion protection for ALB bool false no
delimiter Delimiter to be used between ID elements.
Defaults to - (hyphen). Set to "" to use no delimiter at all.		 string null no
deregistration_delay The amount of time to wait in seconds before changing the state of a deregistering target to unused number 15 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
drop_invalid_header_fields Indicates whether HTTP headers with header fields that are not valid are removed by the load balancer (true) or routed to targets (false). bool false no
enable_glacier_transition (Deprecated, use lifecycle_configuration_rules instead)
Enables the transition to AWS Glacier which can cause unnecessary costs for huge amount of small files		 bool true 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
expiration_days (Deprecated, use lifecycle_configuration_rules instead)
Number of days after which to expunge the objects		 number 90 no
glacier_transition_days (Deprecated, use lifecycle_configuration_rules instead)
Number of days after which to move the data to the Glacier Flexible Retrieval storage tier		 number 60 no
health_check_healthy_threshold The number of consecutive health checks successes required before considering an unhealthy target 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 for the healthcheck string "traffic-port" no
health_check_protocol The protocol to use for the healthcheck. If not specified, same as the traffic protocol string null 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 considering the target unhealthy number 2 no
http2_enabled A boolean flag to enable/disable HTTP/2 bool true no
http_enabled A boolean flag to enable/disable HTTP listener bool true no
http_ingress_cidr_blocks List of CIDR blocks to allow in HTTP security group list(string) 
[
  "0.0.0.0/0",
  "::/0"
]
 no
http_ingress_prefix_list_ids List of prefix list IDs for allowing access to HTTP ingress security group list(string) [] no
http_port The port for the HTTP listener number 80 no
http_redirect A boolean flag to enable/disable HTTP redirect to HTTPS bool false no
https_enabled A boolean flag to enable/disable HTTPS listener bool false no
https_ingress_cidr_blocks List of CIDR blocks to allow in HTTPS security group list(string) 
[
  "0.0.0.0/0",
  "::/0"
]
 no
https_ingress_prefix_list_ids List of prefix list IDs for allowing access to HTTPS ingress security group list(string) [] no
https_port The port for the HTTPS listener number 443 no
https_ssl_policy The name of the SSL Policy for the listener string "ELBSecurityPolicy-TLS13-1-2-2021-06" 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
idle_timeout The time in seconds that the connection is allowed to be idle number 60 no
internal A boolean flag to determine whether the ALB should be internal bool false no
ip_address_type The type of IP addresses used by the subnets for your load balancer. The possible values are ipv4 and dualstack. string "ipv4" 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
lifecycle_configuration_rules A list of S3 bucket v2 lifecycle rules, as specified in terraform-aws-s3-bucket"
These rules are not affected by the deprecated lifecycle_rule_enabled flag.
NOTE: Unless you also set lifecycle_rule_enabled = false you will also get the default deprecated rules set on your bucket.		 
list(object({
    enabled = bool
    id      = string

    abort_incomplete_multipart_upload_days = number

    # filter_and is the and configuration block inside the filter configuration.
    # This is the only place you should specify a prefix.
    filter_and = any
    expiration = any
    transition = list(any)

    noncurrent_version_expiration = any
    noncurrent_version_transition = list(any)
  }))
 [] no
lifecycle_rule_enabled DEPRECATED: Defaults to false, use lifecycle_configuration_rules instead.
When true, configures lifecycle events on this bucket using individual (now deprecated) variables."		 bool false no
listener_additional_tags The additional tags to apply to all listeners map(string) {} no
listener_http_fixed_response Have the HTTP listener return a fixed response for the default action. 
object({
    content_type = string
    message_body = string
    status_code  = string
  })
 null no
listener_https_fixed_response Have the HTTPS listener return a fixed response for the default action. 
object({
    content_type = string
    message_body = string
    status_code  = string
  })
 null no
listener_https_redirect Have the HTTPS listener return a redirect response for the default action. 
object({
    host        = optional(string)
    path        = optional(string)
    port        = optional(string)
    protocol    = optional(string)
    query       = optional(string)
    status_code = string
  })
 null no
load_balancer_name The name for the default load balancer, uses a module label name if left empty string "" no
load_balancer_name_max_length The max length of characters for the load balancer. number 32 no
load_balancing_algorithm_type Determines how the load balancer selects targets when routing requests. Only applicable for Application Load Balancer Target Groups string "round_robin" no
load_balancing_anomaly_mitigation Determines whether to enable target anomaly mitigation. Only supported by the weighted_random load balancing algorithm type. Valid values are 'on' or 'off'. string "off" 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
noncurrent_version_expiration_days (Deprecated, use lifecycle_configuration_rules instead)
Specifies when non-current object versions expire (in days)		 number 90 no
noncurrent_version_transition_days (Deprecated, use lifecycle_configuration_rules instead)
Specifies (in days) when noncurrent object versions transition to Glacier Flexible Retrieval		 number 30 no
preserve_host_header Indicates whether the Application Load Balancer should preserve the Host header in the HTTP request and send it to the target without any change. 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
security_group_enabled Enables the security group bool true no
security_group_ids A list of additional security group IDs to allow access to ALB list(string) [] no
slow_start The amount of time (30-900 seconds) until a healthy target receives its full share of requests from the load balancer. 0 to disable. number null no
stage ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release' string null no
standard_transition_days (Deprecated, use lifecycle_configuration_rules instead)
Number of days to persist in the standard storage tier before moving to the infrequent access tier		 number 30 no
stickiness Target group sticky configuration 
object({
    cookie_duration = number
    enabled         = bool
  })
 null no
subnet_ids A list of subnet IDs to associate with ALB list(string) n/a yes
tags Additional tags (e.g. {'BusinessUnit': 'XYZ'}).
Neither the tag keys nor the tag values will be modified by this module.		 map(string) {} no
target_group_additional_tags The additional tags to apply to the target group map(string) {} no
target_group_name The name for the default target group, uses a module label name if left empty string "" no
target_group_name_max_length The max length of characters for the target group. number 32 no
target_group_port The port for the default target group number 80 no
target_group_protocol The protocol for the default target group HTTP or HTTPS string "HTTP" no
target_group_protocol_version The protocol version for the default target group HTTP1 or HTTP2 or GRPC string "HTTP1" no
target_group_target_type The type (instance, ip or lambda) of targets that can be registered with the target group string "ip" 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
vpc_id VPC ID to associate with ALB string n/a yes
xff_header_processing_mode Determines how the load balancer modifies the X-Forwarded-For header in the HTTP request before sending the request to the target. The possible values are append, preserve, and remove. Only valid for Load Balancers of type application. The default is append string "append" no

Outputs

Name Description
access_logs_bucket_id The S3 bucket ID for access logs
alb_arn The ARN of the ALB
alb_arn_suffix The ARN suffix of the ALB
alb_dns_name DNS name of ALB
alb_name The ARN suffix of the ALB
alb_zone_id The ID of the zone which ALB is provisioned
default_target_group_arn The default target group ARN
default_target_group_arn_suffix The default target group ARN suffix
http_listener_arn The ARN of the HTTP forwarding listener
http_redirect_listener_arn The ARN of the HTTP to HTTPS redirect listener
https_listener_arn The ARN of the HTTPS listener
listener_arns A list of all the listener ARNs
security_group_id The security group ID of the ALB

Related Projects

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License

License

Preamble to the Apache License, Version 2.0

Complete license is available in the LICENSE file.

Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
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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
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  https://www.apache.org/licenses/LICENSE-2.0

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KIND, either express or implied.  See the License for the
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