I’m trying to set up logging for a Google Storage bucket(already existing) using Terraform, but I’m running into a cyclic dependency issue. Here’s my current Terraform configuration:
resource "google_storage_bucket" "user_log_bucket" {
name = google_storage_bucket.user_topic_bucket.name + "-logs"
location = var.location
force_destroy = true
}
resource "google_storage_bucket" "user_topic_bucket"{
name = "user-topic-bucket-${var.env}"
location = var.location
force_destroy = true
uniform_bucket_level_access = true
versioning {
enabled = true
}
logging {
log_bucket = google_storage_bucket.user_log_bucket.name
log_object_prefix = "log"
}
}
The user_topic_bucket is supposed to log to user_log_bucket, but user_log_bucket’s name depends on user_topic_bucket, creating a cyclic dependency.
I have tried decoupling the bucket creation and the logging configuration, but I can’t find a way to do this within Terraform’s current resources and configurations.
How can I resolve this cyclic dependency in Terraform when setting up logging between two Google Storage buckets? Is there a recommended way to separate the creation and logging configuration steps, or is there another approach I should consider?
Any help or examples would be greatly appreciated!
I have tried decoupling the bucket creation and the logging configuration, but I can’t find a way to do this within Terraform’s current resources and configurations.
Solution #1
Put the name of the bucket in locals and use it in both resources in the name argument. Leave reference to another bucket only in the logging block.
locals {
bucket_name = "user-topic-bucket-${var.env}"
}
resource "google_storage_bucket" "user_log_bucket" {
name = local.bucket_name + "-logs"
location = var.location
force_destroy = true
}
resource "google_storage_bucket" "user_topic_bucket"{
name = local.bucket_name
location = var.location
force_destroy = true
uniform_bucket_level_access = true
versioning {
enabled = true
}
logging {
log_bucket = google_storage_bucket.user_log_bucket.name
log_object_prefix = "log"
}
}
Solution #2
Put the name of the bucket in user_log_bucket and then reference this name in user_topic_bucket and use trimsuffix function to remove -logs suffix.
resource "google_storage_bucket" "user_log_bucket" {
name = "user-topic-bucket-${var.env}-logs"
location = var.location
force_destroy = true
}
resource "google_storage_bucket" "user_topic_bucket"{
name = trimsuffix(google_storage_bucket.user_log_bucket.name, "-logs")
location = var.location
force_destroy = true
uniform_bucket_level_access = true
versioning {
enabled = true
}
logging {
log_bucket = google_storage_bucket.user_log_bucket.name
log_object_prefix = "log"
}
}