To create an HTTP load balancer, I made the following .tf file:
resource "google_compute_instance_group_manager" "nginx" {
name = "nginx-igm"
base_instance_name = "nginx"
zone = var.zone
version {
instance_template = google_compute_instance_template.nginx.id
}
target_size = 2
auto_healing_policies {
health_check = google_compute_health_check.autohealing.id
initial_delay_sec = 300
}
}
resource "google_compute_health_check" "autohealing" {
name = "autohealing"
description = "Autohealing health check via http"
timeout_sec = 5
check_interval_sec = 5
healthy_threshold = 2
unhealthy_threshold = 2
http_health_check {
response = "<!DOCTYPE html>"
}
}
resource "google_compute_instance_template" "nginx" {
name = "nginx-template"
description = "This template is used to create nginx instances."
tags = ["http-server"]
instance_description = "Nginx instance"
machine_type = "e2-small"
can_ip_forward = false
scheduling {
automatic_restart = true
on_host_maintenance = "MIGRATE"
}
disk {
source_image = "ubuntu-2004-nginx"
auto_delete = true
boot = true
}
network_interface {
network = "default"
}
}
resource "google_compute_backend_service" "mig-backend" {
name = "mig-backend"
port_name = "http"
protocol = "HTTP"
timeout_sec = 3000
backend {
group = google_compute_instance_group_manager.nginx.self_link
}
health_checks = [google_compute_health_check.http-health-check.self_link]
log_config {
enable = true
}
}
resource "google_compute_url_map" "mig-url-map" {
name = "mig-url-map"
default_service = google_compute_backend_service.mig-backend.self_link
}
resource "google_compute_target_http_proxy" "mig-target-http-proxy" {
name = "mig-target-http-proxy"
url_map = google_compute_url_map.mig-url-map.self_link
}
resource "google_compute_global_forwarding_rule" "mig-global-forwarding-rule-http" {
name = "mig-global-forwarding-rule-http"
target = google_compute_target_http_proxy.mig-target-http-proxy.self_link
port_range = "80"
ip_address = google_compute_global_address.mig-lb-address.address
}
resource "google_compute_global_address" "mig-lb-address" {
name = "mig-lb-address"
}
This configuration file has an obvious flaw on this part:
resource "google_compute_backend_service" "mig-backend" {
name = "mig-backend"
port_name = "http"
protocol = "HTTP"
timeout_sec = 3000
backend {
group = google_compute_instance_group_manager.nginx.self_link
}
health_checks = [google_compute_health_check.http-health-check.self_link]
log_config {
enable = true
}
}
The official documentation says that the backend.group attribute of a backend service should be "the fully-qualified URL of an Instance Group or Network Endpoint Group resource", but in my case I specified the URL of an Instance Group Manager. Actually, I got this error message from GCP:
Error: Error creating BackendService: googleapi: Error 400: Invalid value for field 'resource.backends[0].group': 'https://www.googleapis.com/compute/v1/projects/oiax-lb-test/zones/asia-northeast2-a/instanceGroupManagers/nginx-igm'. Unexpected resource collection 'instanceGroupManagers'., invalid
How should I correct my configuration file to connect the instance group and the backend service?
question from:
https://stackoverflow.com/questions/65878256/terraform-gcp-how-to-connect-a-mig-to-a-backend-service 与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
