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MIT License
Copyright © 2021, Mark Antony Lisle
Permission is hereby granted, free of charge, to any person obtaining a copy
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README.md
View file @ 1f694510
# AWS Application and Network Load Balancer (ALB & NLB) Terraform module
Terraform module which creates Application and Network Load Balancer resources on AWS.
## Usage
### Application Load Balancer
HTTP and HTTPS listeners with default actions:
```hcl
module "alb" {
source = "terraform-aws-modules/alb/aws"
version = "~> 6.0"
name = "my-alb"
load_balancer_type = "application"
vpc_id = "vpc-abcde012"
subnets = ["subnet-abcde012", "subnet-bcde012a"]
security_groups = ["sg-edcd9784", "sg-edcd9785"]
access_logs = {
bucket = "my-alb-logs"
}
target_groups = [
{
name_prefix = "pref-"
backend_protocol = "HTTP"
backend_port = 80
target_type = "instance"
targets = [
{
target_id = "i-0123456789abcdefg"
port = 80
},
{
target_id = "i-a1b2c3d4e5f6g7h8i"
port = 8080
}
]
}
]
https_listeners = [
{
port = 443
protocol = "HTTPS"
certificate_arn = "arn:aws:iam::123456789012:server-certificate/test_cert-123456789012"
target_group_index = 0
}
]
http_tcp_listeners = [
{
port = 80
protocol = "HTTP"
target_group_index = 0
}
]
tags = {
Environment = "Test"
}
}
```
HTTP to HTTPS redirect and HTTPS cognito authentication:
```hcl
module "alb" {
source = "terraform-aws-modules/alb/aws"
version = "~> 6.0"
name = "my-alb"
load_balancer_type = "application"
vpc_id = "vpc-abcde012"
subnets = ["subnet-abcde012", "subnet-bcde012a"]
security_groups = ["sg-edcd9784", "sg-edcd9785"]
access_logs = {
bucket = "my-alb-logs"
}
target_groups = [
{
name_prefix = "pref-"
backend_protocol = "HTTPS"
backend_port = 443
target_type = "instance"
}
]
https_listeners = [
{
port = 443
protocol = "HTTPS"
certificate_arn = "arn:aws:iam::123456789012:server-certificate/test_cert-123456789012"
action_type = "authenticate-cognito"
target_group_index = 0
authenticate_cognito = {
user_pool_arn = "arn:aws:cognito-idp::123456789012:userpool/test-pool"
user_pool_client_id = "6oRmFiS0JHk="
user_pool_domain = "test-domain-com"
}
}
]
http_tcp_listeners = [
{
port = 80
protocol = "HTTP"
action_type = "redirect"
redirect = {
port = "443"
protocol = "HTTPS"
status_code = "HTTP_301"
}
}
]
tags = {
Environment = "Test"
}
}
```
Cognito Authentication only on certain routes, with redirects for other routes:
```hcl
module "alb" {
source = "terraform-aws-modules/alb/aws"
version = "~> 6.0"
name = "my-alb"
load_balancer_type = "application"
vpc_id = "vpc-abcde012"
subnets = ["subnet-abcde012", "subnet-bcde012a"]
security_groups = ["sg-edcd9784", "sg-edcd9785"]
access_logs = {
bucket = "my-alb-logs"
}
target_groups = [
{
name_prefix = "default"
backend_protocol = "HTTPS"
backend_port = 443
target_type = "instance"
}
]
https_listeners = [
{
port = 443
certificate_arn = "arn:aws:iam::123456789012:server-certificate/test_cert-123456789012"
}
]
https_listener_rules = [
{
https_listener_index = 0
priority = 5000
actions = [{
type = "redirect"
status_code = "HTTP_302"
host = "www.youtube.com"
path = "/watch"
query = "v=dQw4w9WgXcQ"
protocol = "HTTPS"
}]
conditions = [{
path_patterns = ["/onboarding", "/docs"]
}]
},
{
https_listener_index = 0
priority = 2
actions = [
{
type = "authenticate-cognito"
user_pool_arn = "arn:aws:cognito-idp::123456789012:userpool/test-pool"
user_pool_client_id = "6oRmFiS0JHk="
user_pool_domain = "test-domain-com"
},
{
type = "forward"
target_group_index = 0
}
]
conditions = [{
path_patterns = ["/protected-route", "private/*"]
}]
}
]
}
```
When you're using ALB Listener rules, make sure that every rule's `actions` block ends in a `forward`, `redirect`, or `fixed-response` action so that every rule will resolve to some sort of an HTTP response. Checkout the [AWS documentation](https://docs.aws.amazon.com/elasticloadbalancing/latest/application/listener-update-rules.html) for more information.
### Network Load Balancer (TCP_UDP, UDP, TCP and TLS listeners)
```hcl
module "nlb" {
source = "terraform-aws-modules/alb/aws"
version = "~> 6.0"
name = "my-nlb"
load_balancer_type = "network"
vpc_id = "vpc-abcde012"
subnets = ["subnet-abcde012", "subnet-bcde012a"]
access_logs = {
bucket = "my-nlb-logs"
}
target_groups = [
{
name_prefix = "pref-"
backend_protocol = "TCP"
backend_port = 80
target_type = "ip"
}
]
https_listeners = [
{
port = 443
protocol = "TLS"
certificate_arn = "arn:aws:iam::123456789012:server-certificate/test_cert-123456789012"
target_group_index = 0
}
]
http_tcp_listeners = [
{
port = 80
protocol = "TCP"
target_group_index = 0
}
]
tags = {
Environment = "Test"
}
}
```
## Assumptions
It's recommended you use this module with [terraform-aws-vpc](https://registry.terraform.io/modules/terraform-aws-modules/vpc/aws), [terraform-aws-security-group](https://registry.terraform.io/modules/terraform-aws-modules/security-group/aws), and [terraform-aws-autoscaling](https://registry.terraform.io/modules/terraform-aws-modules/autoscaling/aws/).
## Notes
1. Terraform AWS provider >= v2.39.0 (via Terraform >= 0.12) has [issue #16674](https://github.com/hashicorp/terraform-provider-aws/issues/16674) related to "Provider produced inconsistent final plan". It means that S3 bucket has to be created before referencing it as an argument inside `access_logs = { bucket = "my-already-created-bucket-for-logs" }`, so this won't work: `access_logs = { bucket = module.log_bucket.s3_bucket_id }`.
## Conditional creation
Sometimes you need to have a way to create ALB resources conditionally but Terraform does not allow to use `count` inside `module` block, so the solution is to specify argument `create_lb`.
```hcl
# This LB will not be created
module "lb" {
source = "terraform-aws-modules/alb/aws"
create_lb = false
# ... omitted
}
```
## Examples
- [Complete Application Load Balancer](https://github.com/terraform-aws-modules/terraform-aws-alb/tree/master/examples/complete-alb)
- [Complete Network Load Balancer](https://github.com/terraform-aws-modules/terraform-aws-alb/tree/master/examples/complete-nlb)
<!-- BEGINNING OF PRE-COMMIT-TERRAFORM DOCS HOOK -->
## Requirements
| Name | Version |
|------|---------|
| <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 0.12.21 |
| <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 3.10 |
| <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 0.13.1 |
| <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 3.40 |
## Providers
| Name | Version |
|------|---------|
| <a name="provider_aws"></a> [aws](#provider\_aws) | >= 3.10 |
| <a name="provider_aws"></a> [aws](#provider\_aws) | >= 3.40 |
## Modules
......@@ -23,8 +313,10 @@ No modules.
| [aws_lb_listener.frontend_http_tcp](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/lb_listener) | resource |
| [aws_lb_listener.frontend_https](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/lb_listener) | resource |
| [aws_lb_listener_certificate.https_listener](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/lb_listener_certificate) | resource |
| [aws_lb_listener_rule.http_tcp_listener_rule](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/lb_listener_rule) | resource |
| [aws_lb_listener_rule.https_listener_rule](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/lb_listener_rule) | resource |
| [aws_lb_target_group.main](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/lb_target_group) | resource |
| [aws_lb_target_group_attachment.this](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/lb_target_group_attachment) | resource |
## Inputs
......@@ -37,9 +329,14 @@ No modules.
| <a name="input_enable_deletion_protection"></a> [enable\_deletion\_protection](#input\_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 |
| <a name="input_enable_http2"></a> [enable\_http2](#input\_enable\_http2) | Indicates whether HTTP/2 is enabled in application load balancers. | `bool` | `true` | no |
| <a name="input_extra_ssl_certs"></a> [extra\_ssl\_certs](#input\_extra\_ssl\_certs) | A list of maps describing any extra SSL certificates to apply to the HTTPS listeners. Required key/values: certificate\_arn, https\_listener\_index (the index of the listener within https\_listeners which the cert applies toward). | `list(map(string))` | `[]` | no |
| <a name="input_http_tcp_listener_rules"></a> [http\_tcp\_listener\_rules](#input\_http\_tcp\_listener\_rules) | A list of maps describing the Listener Rules for this ALB. Required key/values: actions, conditions. Optional key/values: priority, http\_tcp\_listener\_index (default to http\_tcp\_listeners[count.index]) | `any` | `[]` | no |
| <a name="input_http_tcp_listener_rules_tags"></a> [http\_tcp\_listener\_rules\_tags](#input\_http\_tcp\_listener\_rules\_tags) | A map of tags to add to all http listener rules | `map(string)` | `{}` | no |
| <a name="input_http_tcp_listeners"></a> [http\_tcp\_listeners](#input\_http\_tcp\_listeners) | A list of maps describing the HTTP listeners or TCP ports for this ALB. Required key/values: port, protocol. Optional key/values: target\_group\_index (defaults to http\_tcp\_listeners[count.index]) | `any` | `[]` | no |
| <a name="input_http_tcp_listeners_tags"></a> [http\_tcp\_listeners\_tags](#input\_http\_tcp\_listeners\_tags) | A map of tags to add to all http listeners | `map(string)` | `{}` | no |
| <a name="input_https_listener_rules"></a> [https\_listener\_rules](#input\_https\_listener\_rules) | A list of maps describing the Listener Rules for this ALB. Required key/values: actions, conditions. Optional key/values: priority, https\_listener\_index (default to https\_listeners[count.index]) | `any` | `[]` | no |
| <a name="input_https_listener_rules_tags"></a> [https\_listener\_rules\_tags](#input\_https\_listener\_rules\_tags) | A map of tags to add to all https listener rules | `map(string)` | `{}` | no |
| <a name="input_https_listeners"></a> [https\_listeners](#input\_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 https\_listeners[count.index]) | `any` | `[]` | no |
| <a name="input_https_listeners_tags"></a> [https\_listeners\_tags](#input\_https\_listeners\_tags) | A map of tags to add to all https listeners | `map(string)` | `{}` | no |
| <a name="input_idle_timeout"></a> [idle\_timeout](#input\_idle\_timeout) | The time in seconds that the connection is allowed to be idle. | `number` | `60` | no |
| <a name="input_internal"></a> [internal](#input\_internal) | Boolean determinin