First attempt at a "static" ASG-ELB config

Add files for creating a "static" (not heavily parameterized) config with an Auto Scaling group and an Elastic Load Balancer.

Functional, but doesn't work as expected. More testing needed.

Signed-off-by: Scott Lowe <scott.lowe@scottlowe.org>

terraform/aws/asg-elb/data.tf

@@ -0,0 +1,16 @@
+data "aws_ami" "atomic_ami" {
+    most_recent             = true
+    owners                  = ["410186602215"]
+    filter {
+        name                = "name"
+        values              = ["CentOS Atomic Host 7*"]
+    }
+    filter {
+        name                = "virtualization-type"
+        values              = ["hvm"]
+    }
+}
+
+data "aws_vpc" "default_vpc" {
+    default                 = true
+}

terraform/aws/asg-elb/main.tf

@@ -0,0 +1,47 @@
+# Create an ELB
+resource "aws_elb" "elb" {
+    name                        = "elb-test"
+    subnets                     = ["subnet-69e39630","subnet-e0702d97","subnet-c4e9d6a1"]
+    cross_zone_load_balancing   = true
+    connection_draining         = true
+    security_groups             = ["${var.secgrp}"]
+
+    listener {
+        instance_port           = "22"
+        instance_protocol       = "tcp"
+        lb_port                 = "22"
+        lb_protocol             = "tcp"
+    }
+
+    tags {
+        Name                    = "elb-test"
+    }
+}
+
+# Create a launch configuration
+resource "aws_launch_configuration" "lc" {
+    name                        = "lc-test"
+    image_id                    = "${data.aws_ami.atomic_ami.id}"
+    instance_type               = "${var.flavor}"
+    security_groups             = ["${var.secgrp}"]
+    key_name                    = "${var.keypair}"
+
+    lifecycle {
+        create_before_destroy   = true
+    }
+}
+
+# Create an Auto Scaling group
+resource "aws_autoscaling_group" "asg" {
+    name                        = "asg-test"
+    availability_zones          = ["us-west-2a","us-west-2b","us-west-2c"]
+    min_size                    = "2"
+    max_size                    = "2"
+    desired_capacity            = "2"
+    launch_configuration        = "${aws_launch_configuration.lc.name}"
+    load_balancers              = ["elb-test"]
+
+    lifecycle {
+        create_before_destroy   = true
+    }
+}

terraform/aws/asg-elb/provider.tf

@@ -0,0 +1,3 @@
+provider "aws" {
+    region                  = "${var.user_region}"
+}

terraform/aws/asg-elb/variables.tf

@@ -0,0 +1,19 @@
+variable "user_region" {
+    type                    = "string"
+    description             = "AWS region in which all resources will be created"
+}
+
+variable "keypair" {
+    type                    = "string"
+    description             = "AWS SSH keypair to use to connect to instances"
+}
+
+variable "flavor" {
+    type                    = "string"
+    description             = "AWS type to use when creating instances"
+}
+
+variable "secgrp" {
+    type                    = "string"
+    description             = "ID of VPC security group to use"
+}