I'm trying to create na NLB using Terraform v0.11.0 (my application doesn't use HTTP, so I cannot use an ALB). Looking in the Hashcorp documentation, I could create the following code:
resource "aws_lb" "lb" {
name = "test"
internal = false
enable_deletion_protection = true
load_balancer_type = "network"
ip_address_type = "ipv4"
subnet_mapping {
subnet_id = "${data.aws_subnet.sn-app-1.id}"
allocation_id = "${aws_eip.eip-1.id}"
}
subnet_mapping {
subnet_id = "${data.aws_subnet.sn-app-2.id}"
allocation_id = "${aws_eip.eip-2.id}"
}
}
resource "aws_lb_target_group" "lbtg" {
name = "test"
port = "8080"
protocol = "TCP"
vpc_id = "${data.aws_vpc.vpc.id}"
deregistration_delay = "300"
health_check {
interval = "300"
port = "8080"
protocol = "TCP"
timeout = "10"
healthy_threshold = "10"
unhealthy_threshold= "10"
}
}
resource "aws_lb_listener" "front_end" {
load_balancer_arn = "${aws_lb.lb.arn}"
port = "8080"
protocol = "TCP"
default_action {
target_group_arn = "${aws_lb_target_group.lbtg.arn}"
type = "forward"
}
}
resource "aws_autoscaling_group" "asg" {
name = "test"
vpc_zone_identifier = ["${data.aws_subnet.sn-app-1.id}","${data.aws_subnet.sn-app-2.id}"]
min_size = 1
desired_capacity = 1
max_size = 3
launch_configuration = "${aws_launch_configuration.lc.name}"
load_balancers = ["${aws_lb.lb.name}"]
default_cooldown= 180
health_check_grace_period = 180
termination_policies = ["ClosestToNextInstanceHour", "NewestInstance"]
}
I run terraform init
and terraform plan -out=plan.json
and everything goes well, but after run terraform apply plan.json
, Terraform spend some time trying to create the AutoScaling Group and throws something like this:
aws_ecs_service.ecss: 1 error(s) occurred:
-
aws_ecs_service.ecss: InvalidParameterException: The target group with targetGroupArn arn:aws:elasticloadbalancing:us-east-1:xxxxxx:targetgroup/test/xxxxxx does not have an associated load balancer.
status code: 400, request id: b2565334-da9a-11e7-ab5a-8f0bfc9ecd99 "test" -
aws_autoscaling_group.asg: 1 error(s) occurred:
-
aws_autoscaling_group.asg: Error creating AutoScaling Group: ValidationError: Provided Load Balancers may not be valid. Please ensure they exist and try again.
status code: 400, request id: cf2d4ac6-da9a-11e7-950f-050f1f0711f8
How can I associate a target group wth an LB? And why provided Load Balancer may not be valid for the AutoScaling Group?
Best Answer
Try using the
target_group_arns
option on the ASG.