aws-terraform-alb

This module deploys an Application Load Balancer with associated resources, such as an unhealthy host count CloudWatch alarm, S3 log bucket, and Route 53 internal zone record.

Basic Usage

module "alb" {
  source = "[email protected]:rackspace-infrastructure-automation/aws-terraform-alb//?ref=v0.12.5"

  http_listeners_count = 1
  name                 = "MyALB"
  security_groups      = ["${module.sg.public_web_security_group_id}"]
  subnets              = ["${module.vpc.public_subnets}"]
  target_groups_count  = 1
  vpc_id               = "${module.vpc.vpc_id}"

  http_listeners = [
    {
      port     = 80
      protocol = "HTTP"
    },
  ]

  target_groups = [
    {
      backend_port     = 80
      backend_protocol = "HTTP"
      name             = "MyTargetGroup"
    }
  ]
}

Full working references are available at examples

Terraform 0.12 upgrade

Several changes were required while adding terraform 0.12 compatibility. The following changes should
made when upgrading from a previous release to version 0.12.0 or higher.

Terraform State File

During the conversion, we have removed dependency on upstream modules. This does require some resources to be relocated
within the state file. The following statements can be used to update existing resources. In each command, <MODULE_NAME>
should be replaced with the logic name used where the module is referenced. One block applies to load balancers configured
with S3 logging, and the other for those with logging disabled

ALBs configured with S3 logging

terraform state mv module.<MODULE_NAME>.module.alb.aws_lb.application module.<MODULE_NAME>.aws_lb.alb
terraform state mv module.<MODULE_NAME>.module.alb.aws_lb_target_group.main module.<MODULE_NAME>.aws_lb_target_group.main
terraform state mv module.<MODULE_NAME>.module.alb.aws_lb_listener.frontend_http_tcp module.<MODULE_NAME>.aws_lb_listener.http
terraform state mv module.<MODULE_NAME>.module.alb.aws_lb_listener.frontend_https module.<MODULE_NAME>.aws_lb_listener.https

ALBs configured with logging disabled

terraform state mv module.<MODULE_NAME>.module.alb.aws_lb.application_no_logs module.<MODULE_NAME>.aws_lb.alb
terraform state mv module.<MODULE_NAME>.module.alb.aws_lb_target_group.main_no_logs module.<MODULE_NAME>.aws_lb_target_group.main
terraform state mv module.<MODULE_NAME>.module.alb.aws_lb_listener.frontend_http_tcp_no_logs module.<MODULE_NAME>.aws_lb_listener.http
terraform state mv module.<MODULE_NAME>.module.alb.aws_lb_listener.frontend_https_no_logs module.<MODULE_NAME>.aws_lb_listener.https

Module variables

The following module variables were updated to better meet current Rackspace style guides:

• alb_name -> name
• alb_tags -> tags
• logging_bucket_encryption_kms_mster_key -> kms_key_id
• route_53_hosted_zone_id -> internal_zone_id

Requirements

Name	Version
terraform	>= 0.13.7
aws	~> 3.0

Providers

Name	Version
aws	~> 3.0
null	n/a

Modules

Name	Source	Version
unhealthy_host_count_alarm	[email protected]:rackspace-infrastructure-automation/aws-terraform-cloudwatch_alarm//?ref=v0.12.6

Resources

Name
aws_elb_service_account
aws_iam_policy_document
aws_lb
aws_lb_listener
aws_lb_listener_certificate
aws_lb_listener_rule
aws_lb_target_group
aws_lb_target_group_attachment
aws_route53_record
aws_s3_bucket
aws_s3_bucket_policy
aws_wafregional_web_acl_association
null_data_source

Inputs

Name	Description	Type	Default	Required
add_waf	Add an existing Regional WAF to the ALB. true | false	bool	false	no
create_internal_zone_record	Create Route 53 internal zone record for the ALB. i.e true | false	bool	false	no
create_logging_bucket	Create a new S3 logging bucket. i.e. true | false	bool	true	no
customer_alarms_cleared	Specifies whether alarms will notify customers when returning to an OK status.	bool	false	no
customer_alarms_enabled	Specifies whether alarms will notify customers. Automatically enabled if rackspace_managed is set to false	bool	false	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_deletion_protection	If true, deletion of the load balancer will be disabled via the AWS API. This will prevent Terraform from deleting the load balancer. Defaults to false.	bool	false	no
enable_http2	If true sets HTTP/2 to enabled.	bool	true	no
enable_https_redirect	If true and at least one HTTP and one HTTPS listener is created, HTTP listeners will have a redirect rule created to forward all traffic to the first HTTPS listener.	bool	false	no
environment	Application environment for which this network is being created. one of: ('Development', 'Integration', 'PreProduction', 'Production', 'QA', 'Staging', 'Test')	string	"Development"	no
extra_ssl_certs	A list of maps describing any extra SSL certificates to apply to the HTTPS listeners. Certificates must be in the same region as the ALB. Required key/values: certificate_arn, https_listener_index (the index of the listener within https_listeners which the cert applies toward). [{'certificate_arn', 'arn:aws:iam::123456789012:server-certificate/other_test_cert-123456789012', 'https_listener_index', 1}]	list(map(string))	[]	no
extra_ssl_certs_count	The number of extra ssl certs to be added.	number	0	no
http_listeners	List of Maps of HTTP listeners (port, protocol, target_group_index). i.e. [{'port', 80 , 'protocol', 'HTTP'}, {'port', 8080, 'protocol', 'HTTP'}]	list(map(string))	[ { "port": 80, "protocol": "HTTP" } ]	no
http_listeners_count	The number of HTTP listeners to be created.	number	1	no
https_listeners	List of Maps of HTTPS listeners. Certificate must be in the same region as the ALB. (port, certificate_arn, ssl_policy (optional: defaults to ELBSecurityPolicy-2016-08), target_group_index (optional: defaults to 0)) i.e. [{'certificate_arn', 'arn:aws:iam::123456789012:server-certificate/test_cert-123456789012', 'port', 443}]	list(map(string))	[]	no
https_listeners_count	The number of HTTPS listeners to be created.	string	0	no
idle_timeout	The idle timeout value, in seconds. The valid range is 1-3600. The default is 60 seconds.	number	60	no
internal_record_name	Record Name for the new Resource Record in the Internal Hosted Zone. i.e. alb.example.com	string	""	no
internal_zone_id	The Route53 Internal Hosted Zone ID.	string	""	no
kms_key_id	The AWS KMS master key ID used for the SSE-KMS encryption. This can only be used when you set the value of sse_algorithm as aws:kms.	string	""	no
load_balancer_create_timeout	Timeout value when creating the ALB.	string	"10m"	no
load_balancer_delete_timeout	Timeout value when deleting the ALB.	string	"10m"	no
load_balancer_is_internal	Indicates whether the load balancer is Internet-facing or internal. i.e. true | false	bool	false	no
load_balancer_update_timeout	Timeout value when updating the ALB.	string	"10m"	no
logging_bucket_acl	Define ACL for Bucket. Must be either authenticated-read, aws-exec-read, log-delivery-write, private, public-read or public-read-write. Via https://docs.aws.amazon.com/AmazonS3/latest/dev/acl-overview.html#canned-acl	string	"private"	no
logging_bucket_encyption	Enable default bucket encryption. i.e. AES256 | aws:kms	string	"AES256"	no
logging_bucket_force_destroy	Whether all objects should be deleted from the bucket so that the bucket can be destroyed without error. These objects are not recoverable. ie. true | false	bool	false	no
logging_bucket_name	The name of the S3 bucket for the access logs. The bucket name can contain only lowercase letters, numbers, periods (.), and dashes (-). If creating a new logging bucket enter desired bucket name.	string	""	no
logging_bucket_prefix	The prefix for the location in the S3 bucket. If you don't specify a prefix, the access logs are stored in the root of the bucket. Entry must not start with a / or end with one. i.e. 'logs' or 'data/logs'	string	null	no
logging_bucket_retention	The number of days to retain load balancer logs. Parameter is ignored if not creating a new S3 bucket. i.e. between 1 - 999	number	14	no
logging_enabled	Whether logging for this bucket is enabled.	bool	false	no
name	A name for the load balancer, which must be unique within your AWS account.	string	n/a	yes
notification_topic	List of SNS Topic ARNs to use for customer notifications.	list(string)	[]	no
rackspace_alarms_enabled	Specifies whether alarms will create a Rackspace ticket. Ignored if rackspace_managed is set to false.	bool	false	no
rackspace_managed	Boolean parameter controlling if instance will be fully managed by Rackspace support teams, created CloudWatch alarms that generate tickets, and utilize Rackspace managed SSM documents.	bool	true	no
register_instance_targets	List of Maps with the index of the target group and the instance id being registered with that group. i.e. [{'instance_id' : 'i-052f1856e2a471b74', 'target_group_index' : 0}, {'instance_id' : 'i-0cc4b566324707026', 'target_group_index' : 0}]	list(map(string))	[]	no
register_instance_targets_count	Count of ec2 instances being added to the target groups.	number	0	no
security_groups	A list of EC2 security group ids to assign to this resource. i.e. ['sg-edcd9784', 'sg-edcd9785']	list(string)	n/a	yes
subnets	A list of at least two IDs of the subnets to associate with the load balancer. i.e ['subnet-abcde012', 'subnet-bcde012a']	list(string)	n/a	yes
tags	A map of tags to be applied to the ALB. i.e {Environment='Development'}	map(string)	{}	no
target_groups	A list of maps containing key/value pairs that define the target groups to be created. Order of these maps is important and the index of these are to be referenced in listener definitions. Optional key/values are in the target_groups_defaults variable. i.e. [{'name', 'foo', 'backend_protocol', 'HTTP', 'backend_port', '80'}]	list(map(string))	[ { "backend_port": 80, "backend_protocol": "HTTP", "name": "ALB-TargetGroup" } ]	no
target_groups_count	The number of target groups to create	number	1	no
target_groups_defaults	Default values for target groups as defined by the list of maps. i.e. [{ 'cookie_duration': 86400, 'deregistration_delay': 300, 'health_check_healthy_threshold': 3, 'health_check_interval': 10, 'health_check_matcher': '200-299', 'health_check_path': '/', 'health_check_port': 'traffic-port', 'health_check_timeout': 5, 'health_check_unhealthy_threshold': 3, 'stickiness_enabled': true, 'load_balancing_algorithm_type': 'round_robin', 'target_type': 'instance' }]	list(map(string))	[ { "cookie_duration": 86400, "deregistration_delay": 30, "health_check_healthy_threshold": 5, "health_check_interval": 30, "health_check_matcher": "200-299", "health_check_path": "/", "health_check_port": "traffic-port", "health_check_timeout": 5, "health_check_unhealthy_threshold": 2, "load_balancing_algorithm_type": "round_robin", "slow_start": 0, "stickiness_enabled": false, "target_type": "instance" } ]	no
vpc_id	The VPC in which your targets are located. i.e. vpc-abcde012	string	n/a	yes
waf_id	The unique identifier (ID) for the Regional Web Application Firewall (WAF) ACL. i.e. 329d10ec-e221-49d1-9f4b-e1294150d292	string	""	no

Outputs

Name	Description
alb_dns_name	The DNS name of the load balancer.
http_tcp_listener_arns	The ARN of the TCP and HTTP load balancer listeners created.
http_tcp_listener_ids	The IDs of the TCP and HTTP load balancer listeners created.
https_listener_arns	The ARNs of the HTTPS load balancer listeners created.
https_listener_ids	The IDs of the load balancer listeners created.
load_balancer_arn_suffix	ARN suffix of our load balancer - can be used with CloudWatch.
load_balancer_id	The ID and ARN of the load balancer we created.
load_balancer_zone_id	The zone_id of the load balancer to assist with creating DNS records.
logging_bucket_arn	The ARN of the bucket. Will be of format arn:aws:s3:::bucketname.
logging_bucket_domain_name	The bucket domain name. Will be of format bucketname.s3.amazonaws.com.
logging_bucket_hosted_zone_id	The Route 53 Hosted Zone ID for this bucket's region.
logging_bucket_id	The name of the bucket.
logging_bucket_region	The AWS region this bucket resides in.
logging_bucket_regional_domain_name	The bucket region-specific domain name. The bucket domain name including the region name.
target_group_arn_suffixes	ARN suffixes of our target groups - can be used with CloudWatch.
target_group_arns	ARNs of the target groups. Useful for passing to your Auto Scaling group.
target_group_names	Name of the target group. Useful for passing to your CodeDeploy Deployment Group.
unhealthy_host_alarm_id	The ID of the health check.