Terraform AWS ALB

This terraform module is used to create ALB on AWS.

We eat, drink, sleep and most importantly love DevOps. We are working towards strategies for standardizing architecture while ensuring security for the infrastructure. We are strong believer of the philosophy Bigger problems are always solved by breaking them into smaller manageable problems. Resonating with microservices architecture, it is considered best-practice to run database, cluster, storage in smaller connected yet manageable pieces within the infrastructure.

This module is basically combination of Terraform open source and includes automatation tests and examples. It also helps to create and improve your infrastructure with minimalistic code instead of maintaining the whole infrastructure code yourself.

We have fifty plus terraform modules. A few of them are comepleted and are available for open source usage while a few others are in progress.

Prerequisites

This module has a few dependencies:

Examples

IMPORTANT: Since the master branch used in source varies based on new modifications, we suggest that you use the release versions here.

Here are examples of how you can use this module in your inventory structure:

ALB Example

  module "alb" {
    source                     = "clouddrove/alb/aws"
    version                    = "0.15.0"
    name                       = "alb"
    internal                   = false
    load_balancer_type         = "application"
    instance_count             = module.ec2.instance_count
    security_groups            = [module.ssh.security_group_ids, module.http-https.security_group_ids]
    subnets                    = module.public_subnets.public_subnet_id
    enable_deletion_protection = false
    target_id                  = module.ec2.instance_id
    vpc_id                     = module.vpc.vpc_id
    https_enabled              = true
    http_enabled               = true
    https_port                 = 443
    listener_type              = "forward"
    listener_certificate_arn   = "arn:aws:acm:eu-west-1:924144197303:certificate/0418d2ba-91f7-4196-991b-28b5c60cd4cf"
    target_group_port          = 80
    target_groups  = [
      {
        backend_protocol     = "HTTP"
        backend_port         = 80
        target_type          = "instance"
        deregistration_delay = 300
        health_check = {
          enabled             = true
          interval            = 30
          path                = "/"
          port                = "traffic-port"
          healthy_threshold   = 3
          unhealthy_threshold = 3
          timeout             = 10
          protocol            = "HTTP"
          matcher             = "200-399"
        }
      }
    ]
  }

NLB Example

  module "alb" {
    source                     = "clouddrove/alb/aws"
    version                    = "0.15.0"
    name                       = "nlb"
    internal                   = false
    load_balancer_type         = "application"
    instance_count             = module.ec2.instance_count
    subnets                    = module.public_subnets.public_subnet_id
    enable_deletion_protection = false
    target_id                  = module.ec2.instance_id
    vpc_id                     = module.vpc.vpc_id
    http_tcp_listeners = [
      {
        port               = 80
        protocol           = "TCP"
        target_group_index = 0
      },
    ]

    https_listeners = [
      {
        port               = 443
        protocol           = "TLS"
        certificate_arn    = "arn:aws:acm:eu-west-1:924144197303:certificate/0418d2ba-91f7-4196-991b-28b5c60cd4cf"
        target_group_index = 1
      },
    ]

    target_groups = [
      {
        backend_protocol = "TCP"
        backend_port     = 80
        target_type      = "instance"
      },
      {
        backend_protocol = "TLS"
        backend_port     = 443
        target_type      = "instance"
      },
    ]
  }

CLB Example

  module "clb" {
  source                     = "clouddrove/alb/aws"
  version                    = "0.15.0"
  name                       = "clb"

  load_balancer_type = "classic"
  internal        = false
  target_id       = module.ec2.instance_id
  security_groups = [module.ssh.security_group_ids, module.http_https.security_group_ids]
  subnets         = module.public_subnets.public_subnet_id

  listeners = [
  {
  lb_port            = 22000
  lb_protocol        = "TCP"
  instance_port      = 22000
  instance_protocol  = "TCP"
  ssl_certificate_id = null
  },
  {
  lb_port            = 4444
  lb_protocol        = "TCP"
  instance_port      = 4444
  instance_protocol  = "TCP"
  ssl_certificate_id = null
  }
  ]

  health_check_target              = "TCP:4444"
  health_check_timeout             = 10
  health_check_interval            = 30
  health_check_unhealthy_threshold = 5
  health_check_healthy_threshold   = 5
}

Inputs

Name	Description	Type	Default	Required
access_logs	Access logs Enable or Disable.	`bool`	`false`	no
allocation_id	The allocation ID of the Elastic IP address.	`string`	`""`	no
attributes	Additional attributes (e.g. `1`).	`list(any)`	`[]`	no
availability_zones	The AZ's to serve traffic in.	`list(map(string))`	`[]`	no
clb_enable	If true, create clb.	`bool`	`false`	no
connection_draining	TBoolean to enable connection draining. Default: false.	`bool`	`false`	no
connection_draining_timeout	The time after which connection draining is aborted in seconds.	`number`	`300`	no
delimiter	Delimiter to be used between `organization`, `environment`, `name` and `attributes`.	`string`	`"-"`	no
enable	If true, create alb.	`bool`	`false`	no
enable_connection_draining	Whether or not to enable connection draining ("true" or "false").	`bool`	`false`	no
enable_cross_zone_load_balancing	Indicates whether cross zone load balancing should be enabled in application load balancers.	`bool`	`true`	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	Indicates whether HTTP/2 is enabled in application load balancers.	`bool`	`true`	no
environment	Environment (e.g. `prod`, `dev`, `staging`).	`string`	`"test"`	no
health_check_healthy_threshold	The number of successful health checks before an instance is put into service.	`number`	`10`	no
health_check_interval	The time between health check attempts in seconds.	`number`	`30`	no
health_check_target	The target to use for health checks.	`string`	`"TCP:80"`	no
health_check_timeout	The time after which a health check is considered failed in seconds.	`number`	`5`	no
health_check_unhealthy_threshold	The number of failed health checks before an instance is taken out of service.	`number`	`2`	no
http_enabled	A boolean flag to enable/disable HTTP listener.	`bool`	`true`	no
http_listener_type	The type of routing action. Valid values are forward, redirect, fixed-response, authenticate-cognito and authenticate-oidc.	`string`	`"redirect"`	no
http_port	The port on which the load balancer is listening. like 80 or 443.	`number`	`80`	no
http_tcp_listeners	A list of maps describing the HTTP listeners for this ALB. Required key/values: port, protocol. Optional key/values: target_group_index (defaults to 0)	`list(map(string))`	`[]`	no
https_enabled	A boolean flag to enable/disable HTTPS listener.	`bool`	`true`	no
https_listeners	A list of maps describing the HTTPS listeners for this ALB. Required key/values: port, certificate_arn. Optional key/values: ssl_policy (defaults to ELBSecurityPolicy-2016-08), target_group_index (defaults to 0)	`list(map(string))`	`[]`	no
https_port	The port on which the load balancer is listening. like 80 or 443.	`number`	`443`	no
idle_timeout	The time in seconds that the connection is allowed to be idle.	`number`	`60`	no
instance_count	The count of instances.	`number`	`0`	no
internal	If true, the LB will be internal.	`string`	`""`	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_order	Label order, e.g. `name`,`application`.	`list(any)`	[ "name", "environment" ]	no
listener_certificate_arn	The ARN of the SSL server certificate. Exactly one certificate is required if the protocol is HTTPS.	`string`	`""`	no
listener_protocol	The protocol for connections from clients to the load balancer. Valid values are TCP, HTTP and HTTPS. Defaults to HTTP.	`string`	`"HTTPS"`	no
listener_type	The type of routing action. Valid values are forward, redirect, fixed-response, authenticate-cognito and authenticate-oidc.	`string`	`"forward"`	no
listeners	A list of listener configurations for the ELB.	list(object({ lb_port : number lb_protocol : string instance_port : number instance_protocol : string ssl_certificate_id : 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_type	The type of load balancer to create. Possible values are application or network. The default value is application.	`string`	`""`	no
load_balancer_update_timeout	Timeout value when updating the ALB.	`string`	`"10m"`	no
log_bucket_name	S3 bucket (externally created) for storing load balancer access logs. Required if logging_enabled is true.	`string`	`""`	no
managedby	ManagedBy, eg 'CloudDrove'.	`string`	`"[email protected]"`	no
name	Name (e.g. `app` or `cluster`).	`string`	`""`	no
repository	Terraform current module repo	`string`	`"https://github.com/clouddrove/terraform-aws-alb"`	no
security_groups	A list of security group IDs to assign to the LB. Only valid for Load Balancers of type application.	`list(any)`	`[]`	no
status_code	The HTTP redirect code. The redirect is either permanent (HTTP_301) or temporary (HTTP_302).	`string`	`"HTTP_301"`	no
subnet_id	The id of the subnet of which to attach to the load balancer. You can specify only one subnet per Availability Zone.	`string`	`""`	no
subnet_mapping	A list of subnet mapping blocks describing subnets to attach to network load balancer	`list(map(string))`	`[]`	no
subnets	A list of subnet IDs to attach to the LB. Subnets cannot be updated for Load Balancers of type network. Changing this value will for load balancers of type network will force a recreation of the resource.	`list(any)`	`[]`	no
tags	Additional tags (e.g. map(`BusinessUnit`,`XYZ`).	`map(any)`	`{}`	no
target_group_port	The port on which targets receive traffic, unless overridden when registering a specific target.	`string`	`80`	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. Required key/values: name, backend_protocol, backend_port. Optional key/values are in the target_groups_defaults variable.	`any`	`[]`	no
target_id	The ID of the target. This is the Instance ID for an instance, or the container ID for an ECS container. If the target type is ip, specify an IP address.	`list(any)`	n/a	yes
target_type	The type of target that you must specify when registering targets with this target group.	`string`	`""`	no
vpc_id	The identifier of the VPC in which to create the target group.	`string`	`""`	no

Outputs

Name	Description
arn	The ARN of the ALB.
arn_suffix	The ARN suffix of the ALB.
clb_arn	The ARN of the CLB.
clb_name	DNS name of CLB.
clb_zone_id	The ID of the zone which ALB is provisioned.
dns_name	DNS name of ALB.
http_listener_arn	The ARN of the HTTP listener.
https_listener_arn	The ARN of the HTTPS listener.
listener_arns	A list of all the listener ARNs.
main_target_group_arn	The main target group ARN.
name	The ARN suffix of the ALB.
tags	A mapping of tags to assign to the resource.
zone_id	The ID of the zone which ALB is provisioned.

Testing

In this module testing is performed with terratest and it creates a small piece of infrastructure, matches the output like ARN, ID and Tags name etc and destroy infrastructure in your AWS account. This testing is written in GO, so you need a GO environment in your system.

You need to run the following command in the testing folder:

  go test -run Test

Feedback

If you come accross a bug or have any feedback, please log it in our issue tracker, or feel free to drop us an email at [email protected].

If you have found it worth your time, go ahead and give us a ★ on our GitHub!

About us

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We are The Cloud Experts!

We ❤️ Open Source and you can check out our other modules to get help with your new Cloud ideas.

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