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paulbsch merged 2 commits into from
Jan 14, 2026
Merged

Add ability to configure terraform backend via tfvars. #56

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788c557
Add ability to configure terraform backend via tfvars.
paulbsch Jan 6, 2026
e4fb0c5
Comment that only a single terraform backend may be used at a time.
paulbsch Jan 6, 2026
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3 changes: 2 additions & 1 deletion .gitignore
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Original file line number Diff line number Diff line change
Expand Up @@ -32,8 +32,9 @@ override.tf.json
# Include tfplan files to ignore the plan output of command: terraform plan -out=tfplan
# example: *tfplan*

# Ignore dynamically created clusters.tf
# Ignore dynamically created *.tf files
clusters.tf
backend.tf

# Ignore temporary vi files
*.swp
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4 changes: 4 additions & 0 deletions terraform/locals.tf
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@@ -1,6 +1,10 @@
# locals.tf - root module local variable definitions

locals {
backends = {
for key in keys(var.backends):
key => var.backends[key] if var.backends[key].enabled == true
}
clusters = {
gke = {
for key in keys(var.clusters):
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267 changes: 154 additions & 113 deletions terraform/main.tf
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@@ -1,167 +1,208 @@
# main.tf - root module

resource "local_file" "clusters" {
filename = "${path.module}/clusters.tf"
file_permission = "0664"
directory_permission = "0775"

content = <<-EOF
### GKE ####
%{ for key in keys(local.clusters.gke) }
provider "google" {
alias = "${key}"

region = local.clusters.gke["${key}"].location["region"]
project = local.clusters.gke["${key}"].auth["project_id"]
credentials = local.clusters.gke["${key}"].auth["credentials"]
locals {
backend = local.backends[keys(local.backends)[0]]
backend_type = local.backend.type
backend_args = join("\n", compact([
for key, value in local.backend.args:
value != null ? format(" %s = \"%s\"", key, value) : null
]))
}

resource "null_resource" "backend" {
triggers = {
config = jsonencode(local.backend)
}
provisioner "local-exec" {
interpreter = ["/bin/bash", "-c"]
command = <<-EOT
cat > ${path.module}/backend.tf <<EOF
terraform {
backend "${local.backend_type}" {
${local.backend_args}
}
}
EOF
echo "backend.tf created successfully."
EOT
}

lifecycle {
precondition {
condition = length(local.backends) == 1
error_message = "Exactly one backend must be enabled."
}
}
}

resource "null_resource" "clusters" {
triggers = {
config = jsonencode(local.clusters)
}
provisioner "local-exec" {
interpreter = ["/bin/bash", "-c"]
command = <<-EOT
cat > ${path.module}/clusters.tf <<EOF
### GKE ####
%{ for key in keys(local.clusters.gke) }
provider "google" {
alias = "${key}"

region = local.clusters.gke["${key}"].location["region"]
project = local.clusters.gke["${key}"].auth["project_id"]
credentials = local.clusters.gke["${key}"].auth["credentials"]
}

provider "kubernetes" {
alias = "${key}"
provider "kubernetes" {
alias = "${key}"

host = module.${key}.kube_config["host"]
cluster_ca_certificate = base64decode(module.${key}.kube_config["cluster_ca_certificate"])
client_certificate = base64decode(module.${key}.kube_config["client_certificate"])
client_key = module.${key}.kube_config["client_key"]
token = module.${key}.kube_config["token"]
}

provider "helm" {
alias = "${key}"

kubernetes = {
host = module.${key}.kube_config["host"]
cluster_ca_certificate = base64decode(module.${key}.kube_config["cluster_ca_certificate"])
client_certificate = base64decode(module.${key}.kube_config["client_certificate"])
client_key = module.${key}.kube_config["client_key"]
token = module.${key}.kube_config["token"]
}
}

provider "helm" {
alias = "${key}"
module "${key}" {
source = "./modules/gke"

kubernetes = {
host = module.${key}.kube_config["host"]
cluster_ca_certificate = base64decode(module.${key}.kube_config["cluster_ca_certificate"])
client_certificate = base64decode(module.${key}.kube_config["client_certificate"])
client_key = module.${key}.kube_config["client_key"]
token = module.${key}.kube_config["token"]
}
}
cluster = local.clusters.gke["${key}"]
forgerock = var.forgerock

module "${key}" {
source = "./modules/gke"
providers = {
google = google.${key}
kubernetes = kubernetes.${key}
helm = helm.${key}
}
depends_on = [null_resource.clusters]
}

cluster = local.clusters.gke["${key}"]
forgerock = var.forgerock
output "${key}" {
value = format("\n\nGKE Cluster Configuration: %s\n%s\n", "${key}", module.${key}.cluster_info)
}
%{ endfor }

providers = {
google = google.${key}
kubernetes = kubernetes.${key}
helm = helm.${key}
}
depends_on = [local_file.clusters]
}
### EKS ####
%{ for key in keys(local.clusters.eks) }
provider "aws" {
alias = "${key}"

output "${key}" {
value = format("\n\nGKE Cluster Configuration: %s\n%s\n", "${key}", module.${key}.cluster_info)
}
%{ endfor }
region = local.clusters.eks["${key}"].location["region"]
access_key = local.clusters.eks["${key}"].auth["access_key"]
secret_key = local.clusters.eks["${key}"].auth["secret_key"]
}

### EKS ####
%{ for key in keys(local.clusters.eks) }
provider "aws" {
alias = "${key}"
provider "kubernetes" {
alias = "${key}"

region = local.clusters.eks["${key}"].location["region"]
access_key = local.clusters.eks["${key}"].auth["access_key"]
secret_key = local.clusters.eks["${key}"].auth["secret_key"]
}
host = module.${key}.kube_config["host"]
cluster_ca_certificate = base64decode(module.${key}.kube_config["cluster_ca_certificate"])
client_certificate = base64decode(module.${key}.kube_config["client_certificate"])
client_key = module.${key}.kube_config["client_key"]
token = module.${key}.kube_config["token"]
}

provider "kubernetes" {
alias = "${key}"
provider "helm" {
alias = "${key}"

kubernetes = {
host = module.${key}.kube_config["host"]
cluster_ca_certificate = base64decode(module.${key}.kube_config["cluster_ca_certificate"])
client_certificate = base64decode(module.${key}.kube_config["client_certificate"])
client_key = module.${key}.kube_config["client_key"]
token = module.${key}.kube_config["token"]
}
}

provider "helm" {
alias = "${key}"
module "${key}" {
source = "./modules/eks"

kubernetes = {
host = module.${key}.kube_config["host"]
cluster_ca_certificate = base64decode(module.${key}.kube_config["cluster_ca_certificate"])
client_certificate = base64decode(module.${key}.kube_config["client_certificate"])
client_key = module.${key}.kube_config["client_key"]
token = module.${key}.kube_config["token"]
}
cluster = local.clusters.eks["${key}"]
forgerock = var.forgerock

providers = {
aws = aws.${key}
kubernetes = kubernetes.${key}
helm = helm.${key}
}
depends_on = [null_resource.clusters]
}

module "${key}" {
source = "./modules/eks"
output "${key}" {
value = format("\n\nEKS Cluster Configuration: %s\n%s\n", "${key}", module.${key}.cluster_info)
}
%{ endfor }

cluster = local.clusters.eks["${key}"]
forgerock = var.forgerock
### AKS ####
%{ for key in keys(local.clusters.aks) }
provider "azurerm" {
alias = "${key}"

providers = {
aws = aws.${key}
kubernetes = kubernetes.${key}
helm = helm.${key}
features {
resource_group {
prevent_deletion_if_contains_resources = false
}
depends_on = [local_file.clusters]
}

output "${key}" {
value = format("\n\nEKS Cluster Configuration: %s\n%s\n", "${key}", module.${key}.cluster_info)
}
%{ endfor }
#skip_provider_registration = true
}

### AKS ####
%{ for key in keys(local.clusters.aks) }
provider "azurerm" {
alias = "${key}"
provider "kubernetes" {
alias = "${key}"

features {
resource_group {
prevent_deletion_if_contains_resources = false
}
}

#skip_provider_registration = true
}
host = module.${key}.kube_config["host"]
cluster_ca_certificate = base64decode(module.${key}.kube_config["cluster_ca_certificate"])
client_certificate = base64decode(module.${key}.kube_config["client_certificate"])
client_key = base64decode(module.${key}.kube_config["client_key"])
token = module.${key}.kube_config["token"]
}

provider "kubernetes" {
alias = "${key}"
provider "helm" {
alias = "${key}"

kubernetes = {
host = module.${key}.kube_config["host"]
cluster_ca_certificate = base64decode(module.${key}.kube_config["cluster_ca_certificate"])
client_certificate = base64decode(module.${key}.kube_config["client_certificate"])
client_key = base64decode(module.${key}.kube_config["client_key"])
token = module.${key}.kube_config["token"]
}
}

provider "helm" {
alias = "${key}"

kubernetes = {
host = module.${key}.kube_config["host"]
cluster_ca_certificate = base64decode(module.${key}.kube_config["cluster_ca_certificate"])
client_certificate = base64decode(module.${key}.kube_config["client_certificate"])
client_key = base64decode(module.${key}.kube_config["client_key"])
token = module.${key}.kube_config["token"]
}
}

module "${key}" {
source = "./modules/aks"
module "${key}" {
source = "./modules/aks"

cluster = local.clusters.aks["${key}"]
forgerock = var.forgerock
cluster = local.clusters.aks["${key}"]
forgerock = var.forgerock

providers = {
azurerm = azurerm.${key}
kubernetes = kubernetes.${key}
helm = helm.${key}
}
depends_on = [local_file.clusters]
providers = {
azurerm = azurerm.${key}
kubernetes = kubernetes.${key}
helm = helm.${key}
}
depends_on = [null_resource.clusters]
}

output "${key}" {
value = format("\n\nAKS Cluster Configuration: %s\n%s\n", "${key}", module.${key}.cluster_info)
output "${key}" {
value = format("\n\nAKS Cluster Configuration: %s\n%s\n", "${key}", module.${key}.cluster_info)
}
%{ endfor }
EOF
echo "clusters.tf created successfully."
EOT
}
%{ endfor }
EOF
depends_on = [null_resource.backend]
}

38 changes: 38 additions & 0 deletions terraform/terraform.tfvars
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Expand Up @@ -15,6 +15,44 @@ forgerock = {
es_zone = null
}

# Only one backend may be enabled at a time.
backends = {
local = {
enabled = true
type = "local"
args = {
path = "terraform.tfstate"
}
}
gcs = {
enabled = false
type = "gcs"
args = {
bucket = "tf-state"
prefix = "terraform/state"
}
}
s3 = {
enabled = false
type = "s3"
args = {
bucket = "tf-state"
key = "terraform/state"
region = "us-east-1"
}
}
azurerm = {
enabled = false
type = "azurerm"
args = {
access_key = null
storage_account_name = null
container_name = "tfstate"
key = "terraform.tfstate"
}
}
}

clusters = {
tf_cluster_gke_small = {
enabled = false
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3 changes: 2 additions & 1 deletion terraform/tf-apply
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Expand Up @@ -16,7 +16,8 @@ terraform="$terraform_bin -chdir=$terraform_dir"

set -e
$terraform init -upgrade
$terraform apply -target=local_file.clusters -auto-approve -compact-warnings $*
$terraform apply -target=null_resource.backend -auto-approve -compact-warnings -concise $*
$terraform apply -target=null_resource.clusters -auto-approve -compact-warnings -concise $*
$terraform init -upgrade
$terraform apply $*

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