Added proxy and ZFS drives.

modules/aws-nodes/main.tf

@@ -4,6 +4,9 @@ resource "aws_instance" "nodes" {
   # TODO Make this a variable.
   associate_public_ip_address = true
   subnet_id = element(var.subnet-ids, count.index % length(var.subnet-ids))
+  # Set a private IP if var.private-ips is not empty, otherwise let AWS assign
+  # the IP.
+  private_ip = length(var.private-ips) == 0 ? null : element(var.private-ips, count.index)
   vpc_security_group_ids = var.security-group-ids
   user_data = element(var.user-datas.*.rendered, count.index)
   count                       = var.num-nodes

modules/aws-nodes/variables.tf

@@ -21,6 +21,12 @@ variable "num-nodes" {
   type = number
 }
 
+variable "private-ips" {
+  default = []
+  description = "A list of private IP addresses to use for the nodes. If the list is empty then each node will get an IP assigned from AWS."
+  type = list(string)
+}
+
 variable "user-datas" {
   description = "A list of cloud-init configs that get applied to their corresponding node."
 }