Shared state is working. Qeurying for default VPC.

k8s-nodes/main.tf

@@ -1,23 +1,3 @@
-terraform {
-  required_version = ">= 1.0.8"
-
-  backend "s3" {
-
-    bucket         = "mss-terraform-state"
-    key            = "global/s3/terraform.tfstate"
-    region         = "us-gov-west-1"
-
-    dynamodb_table = "mss-terraform-state-lock"
-    encrypt        = true
-
-  }
-  required_providers {
-    libvirt = {
-      source  = "dmacvicar/libvirt"
-      version = "0.6.11"
-    }
-  }
-}
 
 locals {
   nodes-config = {
@@ -54,10 +34,6 @@ module "cloud-init-config" {
 # libvirt modules/resources.
 ################################################################################
 
-provider "aws" {
-  region = "us-gov-west-1"
-}
-
 # This module will grab the latest ami for a variety of distros. Uncomment to
 # get a list of the latest AMIs for our supported distros.
 # module "aws-amis" {
@@ -67,14 +43,27 @@ provider "aws" {
 #   value = module.aws-amis.amis
 # }
 
-module "aws-network" {
-  source            = "./modules/aws-network"
-  name-prefix       = var.vm-name-prefix
-  vpc-cidr-block    = var.aws-vpc-cidr-block
-  subnet-cidr-block = var.aws-subnet-cidr-block
-  admin-ips         = var.admin-ips
+################################################################################
+# AWS Networking
+# Use of the 2 modules below to create resources for the AWS network.
+# aws-network-from-scratch will build the AWS network from scratch.
+# aws-network-existing will query AWS for an existing VPC.
+################################################################################
+
+# module "aws-network-from-scratch" {
+#   source            = "./modules/aws-network-from-scratch"
+#   name-prefix       = var.vm-name-prefix
+#   vpc-cidr-block    = var.aws-vpc-cidr-block
+#   subnet-cidr-block = var.aws-subnet-cidr-block
+#   admin-ips         = var.admin-ips
+# }
+
+module "aws-network-existing" {
+  source = "./modules/aws-network-existing"
 }
 
+################################################################################
+
 # This key pair is not actually used. Keys are added to the nodes via cloud-init
 # instead. We just add this here that this key will show up in the AWS console."
 resource "aws_key_pair" "key" {

k8s-nodes/modules/aws-network-existing/main.tf

@@ -0,0 +1,23 @@
+locals {
+  az-to-subnets = {
+    for s in data.aws_subnet.subnets : s.availability_zone => s.id...
+  }
+}
+
+data "aws_vpc" "default" {
+  tags = {
+    Name = var.default-vpc-name
+  }
+}
+
+data "aws_subnets" "subnet-ids" {
+  filter {
+    name = "vpc-id"
+    values = [data.aws_vpc.default.id]
+  }
+}
+
+data "aws_subnet" "subnets" {
+  for_each = toset(data.aws_subnets.subnet-ids.ids)
+  id = each.key
+}

k8s-nodes/modules/aws-network-existing/outputs.tf

@@ -0,0 +1,18 @@
+output "default-vpc" {
+  value = data.aws_vpc.default
+}
+
+output "subnets" {
+  description = "An array of all subnets in default-vpc."
+  value = data.aws_subnet.subnets
+}
+
+output "k8s-subnets" {
+  description = "An array of subnets to be used for k8s VMs. These subnets were chosen by selecting a single subnet from each availability_zone."
+  value = [for k,v in local.az-to-subnets : v[0]]
+}
+
+output "az-to-subnets" {
+  description = "A map of availability zone to array of subnets that are in thet availability zone."
+  value = local.az-to-subnets
+}

k8s-nodes/modules/aws-network-existing/variables.tf

@@ -0,0 +1,4 @@
+variable "default-vpc-name" {
+  description = "The name of the existing default VPC. This module will query AWS for a VPC with this name,"
+  default = "Managed VPC"
+}

k8s-nodes/variables.tf

@@ -8,6 +8,11 @@ variable "aws-ec2-instance-type" {
   description = "The AWS instance type to use for all nodes."
 }
 
+variable "aws-region" {
+  default = "us-east-1"
+  description = "The AWS region to use."
+}
+
 variable "aws-subnet-cidr-block" {
   default = "10.0.1.0/24"
   description = "The address space to be used for this subnet."