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main.tf
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main.tf
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/**
* Creates an ALB for serving a web app.
*
* Creates the following resources:
*
* * ALB with separate target groups for HTTP and HTTPS.
* * Security Groups for the ALB.
* * Route53 A record pointing to the ALB.
*
* The HTTPS listener uses an Amazon certificate.
* ## Usage
*
* ```hcl
* module "app_alb" {
* source = "../../modules/aws-alb-web-service"
*
* name = "app"
* environment = "prod"
* zone_name = "example.com"
* logs_s3_bucket = "my-aws-logs"
*
* alb_vpc_id = "${module.vpc.vpc_id}"
* alb_subnet_ids = "${module.vpc.public_subnets}"
* alb_health_check_path = "/health"
* }
* ```
*/
locals {
fqdn = "${var.name}.${var.environment}.${var.zone_name}"
}
#
# SG - ALB
#
resource "aws_security_group" "alb_sg" {
name = "alb-${var.name}-${var.environment}"
description = "${var.name}-${var.environment} ALB security group"
vpc_id = "${var.alb_vpc_id}"
tags = {
Environment = "${var.environment}"
}
}
resource "aws_security_group_rule" "app_alb_allow_outbound" {
description = "All outbound"
security_group_id = "${aws_security_group.alb_sg.id}"
type = "egress"
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = ["0.0.0.0/0"]
}
resource "aws_security_group_rule" "app_alb_allow_https_from_world" {
count = "${var.https_container_port == 0 ? 0 : 1}"
description = "Allow in HTTPS"
security_group_id = "${aws_security_group.alb_sg.id}"
type = "ingress"
from_port = 443
to_port = 443
protocol = "tcp"
cidr_blocks = ["0.0.0.0/0"]
}
resource "aws_security_group_rule" "app_alb_allow_http_from_world" {
count = "${var.http_container_port == 0 ? 0 : 1}"
description = "Allow in HTTP"
security_group_id = "${aws_security_group.alb_sg.id}"
type = "ingress"
from_port = 80
to_port = 80
protocol = "tcp"
cidr_blocks = ["0.0.0.0/0"]
}
#
# ALB
#
data "aws_acm_certificate" "main" {
domain = "${local.fqdn}"
statuses = ["ISSUED"]
most_recent = true
}
resource "aws_alb" "main" {
name = "${var.name}-${var.environment}"
subnets = ["${var.alb_subnet_ids}"]
security_groups = ["${aws_security_group.alb_sg.id}"]
access_logs {
enabled = true
bucket = "${var.logs_s3_bucket}"
prefix = "alb/${var.name}-${var.environment}"
}
tags = {
Environment = "${var.environment}"
}
}
resource "aws_alb_target_group" "https" {
count = "${var.https_container_port == 0 ? 0 : 1}"
name = "ecs-${var.name}-${var.environment}-https"
port = "${var.https_container_port}"
protocol = "${var.https_container_protocol}"
vpc_id = "${var.alb_vpc_id}"
target_type = "ip"
# The amount time for the ALB to wait before changing the state of a
# deregistering target from draining to unused. Default is 300 seconds.
deregistration_delay = 90
health_check {
path = "${var.https_container_health_check_path}"
protocol = "${var.https_container_protocol}"
matcher = "${var.https_container_success_codes}"
}
# Ensure the ALB exists before things start referencing this target group.
depends_on = ["aws_alb.main"]
tags = {
Environment = "${var.environment}"
}
}
resource "aws_alb_listener" "https" {
count = "${var.https_container_port == 0 ? 0 : 1}"
load_balancer_arn = "${aws_alb.main.id}"
port = "443"
protocol = "HTTPS"
certificate_arn = "${data.aws_acm_certificate.main.arn}"
default_action {
target_group_arn = "${aws_alb_target_group.https.id}"
type = "forward"
}
}
resource "aws_alb_target_group" "http" {
count = "${var.http_container_port == 0 ? 0 : 1}"
name = "ecs-${var.name}-${var.environment}-http"
port = "${var.http_container_port}"
protocol = "${var.http_container_protocol}"
vpc_id = "${var.alb_vpc_id}"
target_type = "ip"
# The amount time for the ALB to wait before changing the state of a
# deregistering target from draining to unused. Default is 300 seconds.
deregistration_delay = 10
health_check {
path = "${var.http_container_health_check_path}"
protocol = "${var.http_container_protocol}"
matcher = "${var.http_container_success_codes}"
}
# Ensure the ALB exists before things start referencing this target group.
depends_on = ["aws_alb.main"]
tags = {
Environment = "${var.environment}"
}
}
resource "aws_alb_listener" "http" {
count = "${var.http_container_port == 0 ? 0 : 1}"
load_balancer_arn = "${aws_alb.main.id}"
port = "80"
protocol = "HTTP"
default_action {
target_group_arn = "${aws_alb_target_group.http.id}"
type = "forward"
}
}