Extract packer-backed droplet logic to a shared module

prod/syncthing/terraform/main.tf

@@ -4,43 +4,12 @@ provider "digitalocean" {
   spaces_secret_key = var.spaces_secret_key
 }
 
-data "terraform_remote_state" "do_ssh_keys" {
+module "packer_droplet" {
-  backend = "s3"
+  source            = "../../../terraform-modules/packer_droplet"
-
-  config = {
-    skip_credentials_validation = true
-    skip_metadata_api_check     = true
-    access_key                  = var.spaces_access_id
-    secret_key                  = var.spaces_secret_key
-    region                      = "us-east-1"
-    endpoint                    = "nyc3.digitaloceanspaces.com"
-    bucket                      = "jdormit-tf-state"
-    key                         = "mgmt/do-ssh-keys.tfstate"
-  }
-}
-
-data "local_file" "packer_manifest" {
-  filename = "${path.module}/../packer/packer-manifest.json"
-}
-
-locals {
-  packer_manifest  = jsondecode(data.local_file.packer_manifest.content)
-  packer_builds = local.packer_manifest.builds
-  packer_image_str = element(local.packer_builds, length(local.packer_builds) - 1).artifact_id
-  packer_image     = split(":", local.packer_image_str)[1]
-}
-
-resource "digitalocean_droplet" "syncthing" {
   name              = "syncthing"
-  image      = local.packer_image
+  do_token          = var.do_token
-  region     = "nyc1"
+  spaces_access_id  = var.spaces_access_id
-  size       = "s-1vcpu-1gb"
+  spaces_secret_key = var.spaces_secret_key
-  backups    = true
-  volume_ids = [digitalocean_volume.syncthing_volume.id]
-  ssh_keys = [
-    data.terraform_remote_state.do_ssh_keys.outputs.jdormit_laptop_ssh_key_id,
-    data.terraform_remote_state.do_ssh_keys.outputs.jdormit_macbook_lola_ssh_key_id
-  ]
 }
 
 resource "digitalocean_volume" "syncthing_volume" {
@@ -55,3 +24,8 @@ resource "digitalocean_volume" "syncthing_volume" {
     prevent_destroy = true
   }
 }
+
+resource "digitalocean_volume_attachment" "syncthing" {
+  droplet_id = module.packer_droplet.droplet_id
+  volume_id  = digitalocean_volume.syncthing_volume.id
+}

prod/syncthing/terraform/outputs.tf

@@ -1,9 +1,9 @@
 output "ip_address" {
-  value = digitalocean_droplet.syncthing.ipv4_address
+  value = module.packer_droplet.droplet_ip_address
 }
 
 output "urn" {
-  value = digitalocean_droplet.syncthing.urn
+  value = module.packer_droplet.droplet_urn
 }
 
 output "volume_urn" {

prod/wallabag/terraform/main.tf

@@ -4,40 +4,10 @@ provider "digitalocean" {
   spaces_secret_key = var.spaces_secret_key
 }
 
-data "terraform_remote_state" "do_ssh_keys" {
+module "packer_droplet" {
-  backend = "s3"
+  source            = "../../../terraform-modules/packer_droplet"
-
-  config = {
-    skip_credentials_validation = true
-    skip_metadata_api_check     = true
-    access_key                  = var.spaces_access_id
-    secret_key                  = var.spaces_secret_key
-    region                      = "us-east-1"
-    endpoint                    = "nyc3.digitaloceanspaces.com"
-    bucket                      = "jdormit-tf-state"
-    key                         = "mgmt/do-ssh-keys.tfstate"
-  }
-}
-
-data "local_file" "packer_manifest" {
-  filename = "${path.module}/../packer/packer-manifest.json"
-}
-
-locals {
-  packer_manifest  = jsondecode(data.local_file.packer_manifest.content)
-  packer_builds = local.packer_manifest.builds
-  packer_image_str = element(local.packer_builds, length(local.packer_builds) - 1).artifact_id
-  packer_image     = split(":", local.packer_image_str)[1]
-}
-
-resource "digitalocean_droplet" "wallabag" {
   name              = "wallabag"
-  image      = local.packer_image
+  do_token          = var.do_token
-  region     = "nyc1"
+  spaces_access_id  = var.spaces_access_id
-  size       = "s-1vcpu-1gb"
+  spaces_secret_key = var.spaces_secret_key
-  backups    = true
-  ssh_keys = [
-    data.terraform_remote_state.do_ssh_keys.outputs.jdormit_laptop_ssh_key_id,
-    data.terraform_remote_state.do_ssh_keys.outputs.jdormit_macbook_lola_ssh_key_id
-  ]
 }

prod/wallabag/terraform/outputs.tf

@@ -1,7 +1,7 @@
 output "ip_address" {
-  value = digitalocean_droplet.wallabag.ipv4_address
+  value = module.packer_droplet.droplet_ip_address
 }
 
 output "urn" {
-  value = digitalocean_droplet.wallabag.urn
+  value = module.packer_droplet.droplet_urn
 }

terraform-modules/packer_droplet/interface.tf

@@ -0,0 +1,55 @@
+variable "do_token" {
+  type = string
+}
+
+variable "spaces_access_id" {
+  type = string
+}
+
+variable "spaces_secret_key" {
+  type = string
+}
+
+variable "name" {
+  description = "Droplet name"
+  type        = string
+}
+
+variable "packer_manifest" {
+  description = "Path to the packer manifest JSON file"
+  type        = string
+  default     = "../packer/packer-manifest.json"
+}
+
+variable "region" {
+  description = "Droplet region"
+  type        = string
+  default     = "nyc1"
+}
+
+variable "droplet_size" {
+  description = "Droplet size descriptor"
+  type        = string
+  default     = "s-1vcpu-1gb"
+}
+
+variable "backups" {
+  description = "Whether to enable droplet backups"
+  type        = bool
+  default     = true
+}
+
+output "droplet_id" {
+  description = "Droplet ID"
+  value       = digitalocean_droplet.droplet.id
+}
+
+output "droplet_ip_address" {
+  description = "Droplet IPv4 address"
+  value       = digitalocean_droplet.droplet.ipv4_address
+}
+
+output "droplet_urn" {
+  description = "Droplet URN"
+  value       = digitalocean_droplet.droplet.urn
+}

terraform-modules/packer_droplet/main.tf

@@ -0,0 +1,43 @@
+provider "digitalocean" {
+  token             = var.do_token
+  spaces_access_id  = var.spaces_access_id
+  spaces_secret_key = var.spaces_secret_key
+}
+
+data "terraform_remote_state" "do_ssh_keys" {
+  backend = "s3"
+
+  config = {
+    skip_credentials_validation = true
+    skip_metadata_api_check     = true
+    access_key                  = var.spaces_access_id
+    secret_key                  = var.spaces_secret_key
+    region                      = "us-east-1"
+    endpoint                    = "nyc3.digitaloceanspaces.com"
+    bucket                      = "jdormit-tf-state"
+    key                         = "mgmt/do-ssh-keys.tfstate"
+  }
+}
+
+data "local_file" "packer_manifest" {
+  filename = "${path.root}/${var.packer_manifest}"
+}
+
+locals {
+  packer_manifest  = jsondecode(data.local_file.packer_manifest.content)
+  packer_builds    = local.packer_manifest.builds
+  packer_image_str = element(local.packer_builds, length(local.packer_builds) - 1).artifact_id
+  packer_image     = split(":", local.packer_image_str)[1]
+}
+
+resource "digitalocean_droplet" "droplet" {
+  name    = var.name
+  image   = local.packer_image
+  region  = var.region
+  size    = var.droplet_size
+  backups = var.backups
+  ssh_keys = [
+    data.terraform_remote_state.do_ssh_keys.outputs.jdormit_laptop_ssh_key_id,
+    data.terraform_remote_state.do_ssh_keys.outputs.jdormit_macbook_lola_ssh_key_id
+  ]
+}

terraform-modules/packer_droplet/terraform.tf

@@ -0,0 +1,8 @@
+terraform {
+  required_providers {
+    digitalocean = {
+      source  = "digitalocean/digitalocean"
+      version = "~> 2.3.0"
+    }
+  }
+}