AWS Elastic Load Balancer (ELB) Terraform module

Terraform module which creates ELB resources on AWS.

These types of resources are supported:

• ELB
• ELB Attachment

Root module calls these modules which can also be used separately to create independent resources:

• elb - creates ELB
• elb_attachment - creates ELB attachment

Usage

module "elb_http" {
  source = "terraform-aws-modules/elb/aws"

  name = "elb-example"

  subnets         = ["subnet-12345678", "subnet-87654321"]
  security_groups = ["sg-12345678"]
  internal        = false

  listener = [
    {
      instance_port     = "80"
      instance_protocol = "HTTP"
      lb_port           = "80"
      lb_protocol       = "HTTP"
    },
  ]

  health_check = [
    {
      target              = "HTTP:80/"
      interval            = 30
      healthy_threshold   = 2
      unhealthy_threshold = 2
      timeout             = 5
    },
  ]

  access_logs = [
    {
      bucket = "my-access-logs-bucket"
    },
  ]

  // ELB attachments
  number_of_instances = 2
  instances           = ["i-06ff41a77dfb5349d", "i-4906ff41a77dfb53d"]
  
  tags = {
    Owner       = "user"
    Environment = "dev"
  }
}

Examples

• Complete ELB example

Known Issues/Limitations

• Support for HTTPS is a common requirment for Internet facing ELBs. However, there is a known Terraform limitation with providing a dynamic computed value for the ssl_id_certificate parameter in nested block structures (Refer to: hashicorp/terraform#16582 (comment)).

Inputs

Name	Description	Type	Default	Required
access_logs	An access logs block	list	<list>	no
connection_draining	Boolean to enable connection draining	string	false	no
connection_draining_timeout	The time in seconds to allow for connections to drain	string	300	no
cross_zone_load_balancing	Enable cross-zone load balancing	string	true	no
health_check	A health check block	list	-	yes
idle_timeout	The time in seconds that the connection is allowed to be idle	string	60	no
instances	List of instances ID to place in the ELB pool	list	<list>	no
internal	If true, ELB will be an internal ELB	string	-	yes
listener	A list of listener blocks	list	-	yes
name	The name of the ELB	string	-	yes
number_of_instances	Number of instances to attach to ELB	string	0	no
security_groups	A list of security group IDs to assign to the ELB	list	-	yes
subnets	A list of subnet IDs to attach to the ELB	list	-	yes
tags	A mapping of tags to assign to the resource	string	<map>	no

Outputs

Name	Description
this_elb_arn	The ARN of the ELB
this_elb_dns_name	The DNS name of the ELB
this_elb_id	The name of the ELB
this_elb_instances	The list of instances in the ELB
this_elb_name	The name of the ELB
this_elb_source_security_group_id	The ID of the security group that you can use as part of your inbound rules for your load balancer's back-end application instances
this_elb_zone_id	The canonical hosted zone ID of the ELB (to be used in a Route 53 Alias record)

Authors

Module managed by Anton Babenko.

License

Apache 2 Licensed. See LICENSE for full details.