Merge pull request #12 from sclausson/cluster_tag_value

Use interpolated tags syntax to add extra tags to cluster nodes

modules/vault-cluster/README.md

@@ -29,6 +29,23 @@ module "vault_cluster" {
               #!/bin/bash
               /opt/vault/bin/run-vault --s3-bucket ${var.vault_s3_bucket} --s3-bucket-region ${var.aws_region} --tls-cert-file /opt/vault/tls/vault.crt.pem --tls-key-file /opt/vault/tls/vault.key.pem
               EOF
+
+  # Add tag to each node in the cluster with value set to var.cluster_name
+  cluster_tag_key   = "Name"
+
+  # Optionally add extra tags to each node in the cluster
+  cluster_extra_tags = [
+    {
+      key = "Environment"
+      value = "Dev"
+      propagate_at_launch = true
+    },
+    {
+      key = "Department"
+      value = "Ops"
+      propagate_at_launch = true
+    }
+  ]
   
   # ... See vars.tf for the other parameters you must define for the vault-cluster module
 }

modules/vault-cluster/main.tf

@@ -28,11 +28,12 @@ resource "aws_autoscaling_group" "autoscaling_group" {
   health_check_grace_period = "${var.health_check_grace_period}"
   wait_for_capacity_timeout = "${var.wait_for_capacity_timeout}"
 
-  tag {
-    key                 = "${var.cluster_tag_key}"
-    value               = "${var.cluster_name}"
-    propagate_at_launch = true
-  }
+  tags = ["${concat(
+    list(
+      map("key", var.cluster_tag_key, "value", var.cluster_name, "propagate_at_launch", true)
+    ),
+    var.cluster_extra_tags)
+  }"]
 }
 
 # ---------------------------------------------------------------------------------------------------------------------

modules/vault-cluster/variables.tf

@@ -80,6 +80,20 @@ variable "cluster_tag_key" {
   default     = "Name"
 }
 
+variable "cluster_extra_tags" {
+  description = "A list of additional tags to add to each Instance in the ASG. Each element in the list must be a map with the keys key, value, and propagate_at_launch"
+  type = "list"
+  #example: 
+  # default = [
+  #   {
+  #     key = "Environment"
+  #     value = "Dev"
+  #     propagate_at_launch = true
+  #   } 
+  # ]
+  default = []
+}
+
 variable "termination_policies" {
   description = "A list of policies to decide how the instances in the auto scale group should be terminated. The allowed values are OldestInstance, NewestInstance, OldestLaunchConfiguration, ClosestToNextInstanceHour, Default."
   default     = "Default"