Updated example and made security group required

examples/basic/main.tf

@@ -2,6 +2,22 @@ provider "aws" {
   region = "eu-west-1"
 }
 
+##################################################################
+# Data sources to get VPC, subnet, security group and AMI details
+##################################################################
+data "aws_vpc" "default" {
+  default = true
+}
+
+data "aws_subnet_ids" "all" {
+  vpc_id = "${data.aws_vpc.default.id}"
+}
+
+data "aws_security_group" "default" {
+  vpc_id = "${data.aws_vpc.default.id}"
+  name   = "default"
+}
+
 data "aws_ami" "amazon_linux" {
   most_recent = true
 
@@ -28,4 +44,6 @@ module "ec2" {
   name                        = "example"
   ami                         = "${data.aws_ami.amazon_linux.id}"
   instance_type               = "t2.micro"
+  vpc_security_group_ids      = ["${data.aws_security_group.default.id}"]
+  associate_public_ip_address = true
 }

variables.tf

@@ -57,7 +57,7 @@ variable "monitoring" {
 
 variable "vpc_security_group_ids" {
   description = "A list of security group IDs to associate with"
-  default     = []
+  type        = "list"
 }
 
 variable "subnet_id" {