Kubernetes supports dots in metadata label keys (for example app.role), and indeed this seems to be a common convention.
The terraform configuration language (0.12) doesn't support dots in argument names, so labels of this form cannot be specified. For example in a google_container_node_pool configuration, I want to specify this:
resource "google_container_node_pool" "my-node-pool" {
...
labels = {
app.role = web
}
}
Is there a workaround?
note: slashes (/) are quite common in k8s labels as well..
UPDATE: in case anyone stumbles on this same issue down the road, I figured out the root of my issue. I had incorrectly specified the labels argument as a block by omitting the =. So it looked like this:
labels {
"app.role" = "web"
}
This yielded the following error, which pointed me in the wrong direction:
Error: Invalid argument name
on main.tf line 45, in resource "google_container_node_pool" "primary_preemptible_nodes":
45: "app.role" = "web"
Argument names must not be quoted.I noticed and fixed the missing = but I didn't put it together that map keys have different syntax from argument names.
I verified the suggestion from @ydaetskcoR that wrapping the label in quotes works. Here is the snippet defining the node pool that I created (using Terraform v0.11.13):
resource "google_container_node_pool" "node_pool" {
cluster = "${google_container_cluster.cluster.name}"
zone = "${var.cluster_location}"
initial_node_count = "${var.node_count}"
autoscaling {
min_node_count = 1
max_node_count = 5
}
management {
auto_repair = true
auto_upgrade = true
}
node_config {
machine_type = "${var.machine_type}"
oauth_scopes = [
"https://www.googleapis.com/auth/logging.write",
"https://www.googleapis.com/auth/monitoring",
"https://www.googleapis.com/auth/devstorage.read_only",
]
metadata {
disable-legacy-endpoints = "true"
}
labels = {
"app.role" = "web"
}
}
}
edit: I also verified that the same works with terraform 0.12.3.