Adding dns logic and az round robin

Author: JDeBo

terraform/.gitignore

@@ -1,3 +1,4 @@
 .terraform/
 *.tfvars
 *tfstate*
+!main.auto.tfvars

terraform/.terraform.lock.hcl

@@ -1,15 +1,39 @@
 
-data "aws_route53_zone" "name" {
-  count = var.zone_name ? 1 : 0
+data "aws_route53_zone" "root_zone" {
+  count = var.create_dns ? 1 : 0
   name  = var.zone_name
 
 }
 
-resource "aws_route53_record" "name" {
-  count   = var.zone_name ? var.num_teams : 0
-  zone_id = data.aws_route53_zone.name[0].zone_id
-  name    = "team-${count.index + 1}"
+resource "aws_route53_zone" "workshop_zone" {
+  count = var.create_dns ? 1 : 0
+  name  = "${var.event_name}.${var.zone_name}"
+}
+
+resource "aws_route53_record" "workshop" {
+  count   = var.create_dns ? 1 : 0
+  zone_id = data.aws_route53_zone.root_zone[0].zone_id
+  name    = aws_route53_zone.workshop_zone[0].name
+  type    = "NS"
+  ttl     = "300"
+  records = aws_route53_zone.workshop_zone[0].name_servers
+}
+
+resource "aws_route53_record" "teams" {
+  count      = var.create_dns ? var.num_teams : 0
+  zone_id    = aws_route53_zone.workshop_zone[0].zone_id
+  name       = "team-${count.index + 1}"
+  type       = "A"
+  ttl        = 300 #5 mins
+  records    = [module.team_servers[count.index].public_ip]
+  depends_on = [aws_route53_record.hub]
+}
+
+resource "aws_route53_record" "hub" {
+  count   = var.create_dns ? 1 : 0
+  zone_id = aws_route53_zone.workshop_zone[0].zone_id
+  name    = "hub"
   type    = "A"
-  ttl     = var.ttl
-  records = [aws_instance.instance[count.index].public_ip]
+  ttl     = 300 #5 mins
+  records = [module.hub.public_ip]
 }

terraform/dns.tf

@@ -0,0 +1,27 @@
+num_teams  = 2
+event_name = "codemash"
+custom_security_group_ingress = [{
+  from_port   = 2332,
+  to_port     = 2332,
+  protocol    = "tcp",
+  description = "ssh",
+  cidr_blocks = "0.0.0.0/0"
+  },
+  {
+    from_port   = 8080,
+    to_port     = 8080,
+    protocol    = "tcp",
+    description = "http",
+    cidr_blocks = "0.0.0.0/0"
+  }
+  # Wetty config
+  , {
+    from_port   = 0,
+    to_port     = 6556,
+    protocol    = "tcp",
+    description = "http",
+    cidr_blocks = "0.0.0.0/0"
+  }
+]
+zone_name  = "sbx.justindebo.com"
+create_dns = true

terraform/main.auto.tfvars

@@ -20,8 +20,8 @@ module "vpc" {
   name = local.name
   cidr = "10.0.0.0/16"
 
-  azs            = [data.aws_availability_zones.available.names]
-  public_subnets = ["10.0.1.0/24"]
+  azs            = [data.aws_availability_zones.available.names[0], data.aws_availability_zones.available.names[1]]
+  public_subnets = cidrsubnets("10.0.0.0/16", 8, 8)
 
   enable_nat_gateway = false
 
@@ -124,7 +124,7 @@ module "team_servers" {
   instance_type               = "t3a.micro"
   key_name                    = aws_key_pair.main.key_name
   vpc_security_group_ids      = [module.security_group.security_group_id]
-  subnet_id                   = module.vpc.public_subnets[0]
+  subnet_id                   = module.vpc.public_subnets[count.index % 2]
   associate_public_ip_address = true
 
   user_data = <<-EOF

terraform/main.tf

@@ -2,6 +2,10 @@ output "instance_ips" {
   value = { for instance in module.team_servers : instance.tags_all["Name"] => instance.public_ip }
 }
 
+output "instance_dns" {
+  value = { for dns in aws_route53_record.teams : "${dns.name}.${aws_route53_zone.workshop_zone[0].name}" => dns.records }
+}
+
 output "hub_pub_ip" {
   value = module.hub.public_ip
 }

terraform/outputs.tf

@@ -32,3 +32,15 @@ variable "ssh_local_key_path" {
   type        = string
   default     = "~/.ssh/id_rsa.pub"
 }
+
+variable "create_dns" {
+  description = "Whether to create a Route53 DNS zone for the workshop instances"
+  type        = bool
+  default     = false
+}
+
+variable "zone_name" {
+  description = "Route53 zone name to use for workshop instances"
+  type        = string
+  default     = null
+}