added rediscluster for storing SF sessions

Author: merlijntishauser

README.md

@@ -88,6 +88,13 @@ and the inline policy for the aim user terraform-bot-account
 
 ## deploy the infrastructure 
 
+Ensure the environment variables are loaded in your terminal sessions and that you are in the terraform directory.
+Then simply type:
+```
+make apply
+```
+
+Warning: creating the redis cluster can take a significant amount of time (> 5 minutes). Just be patient and let it finish.
 
 ## useful commands for testing the infrastructure
 

terraform/Makefile

@@ -33,14 +33,16 @@ show:
 	terraform show
 
 output:
-	@echo "*** DOCKERNODES ***"
+	@echo "\n*** DOCKERNODES ***"
 	@terraform output --module=dockernodes
-	@echo "*** LOADBALANCERS ***"
+	@echo "\n*** LOADBALANCERS ***"
 	@terraform output --module=loadbalancers
-	@echo "*** MONGONODES *** "
+	@echo "\n*** MONGONODES *** "
 	@terraform output --module=mongodbnodes
-	@echo "*** VPC ***"
+	@echo "\n*** VPC ***"
 	@terraform output --module=vpc
+	@echo "\n*** Redis ***"
+	@terraform output --module=rediscluster
 
 ping:
 	ansible -i bin/terraform.py/terraform.py -m ping all

terraform/main.tf

@@ -54,3 +54,19 @@ module "mongodbnodes" {
   default_sg_id    = "${module.vpc.default_sg_id}"
   subnet_id_zones  = "${module.vpc.subnet_id_zones}"
 }
+
+module "rediscluster" {
+  source = "./redis"
+
+  env              = "${var.env}"
+  region           = "${var.region}"
+  vpc_id           = "${module.vpc.vpc_id}"
+  vpc_private_cidr = "${module.vpc.vpc_private_cidr}"
+  subnet_id_zones  = "${module.vpc.subnet_id_zones}"
+
+  cache_name = "redis-cache"
+  engine_version = "2.8.22"
+  instance_type = "cache.t2.micro"
+  maintenance_window = "sun:05:00-sun:06:00"
+
+}

terraform/redis/outputs.tf

@@ -0,0 +1,15 @@
+output "cache_security_group_id" {
+  value = "${aws_security_group.redis.id}"
+}
+
+output "hostname" {
+  value = "${aws_elasticache_cluster.redis.cache_nodes.0.address}"
+}
+
+output "port" {
+  value = "${aws_elasticache_cluster.redis.cache_nodes.0.port}"
+}
+
+output "endpoint" {
+  value = "${format("%s:%s", aws_elasticache_cluster.redis.cache_nodes.0.address, aws_elasticache_cluster.redis.cache_nodes.0.port)}"
+}

terraform/redis/redis.tf

@@ -0,0 +1,34 @@
+resource "aws_security_group" "redis" {
+  name        = "redis_security_group"
+  description = "Allowing access to redis cluster"
+  vpc_id      = "${var.vpc_id}"
+
+}
+
+resource "aws_elasticache_cluster" "redis" {
+  cluster_id           = "${var.cache_name}"
+  engine               = "redis"
+  engine_version       = "${var.engine_version}"
+  maintenance_window   = "${var.maintenance_window}"
+  node_type            = "${var.instance_type}"
+  num_cache_nodes      = "1"
+  parameter_group_name = "default.redis2.8"
+  port                 = "6379"
+  subnet_group_name    = "${aws_elasticache_subnet_group.default.name}"
+  security_group_ids   = ["${aws_security_group.redis.id}"]
+
+  tags {
+    Name = "CacheCluster"
+    env   = "${var.env}"
+    role = "redisnode"
+    Name  = "${format("redis-%02d", count.index + 1)}"
+  }
+}
+
+resource "aws_elasticache_subnet_group" "default" {
+  name        = "${var.cache_name}-subnet-group"
+  description = "Private subnets for the ElastiCache instances"
+  subnet_ids  = ["${var.subnet_id_zones}"]
+}
+
+

terraform/redis/variables.tf

@@ -0,0 +1,21 @@
+variable "env" {}
+variable "region" {}
+
+variable "vpc_id" {}
+variable "vpc_private_cidr" {}
+variable "subnet_id_zones" {
+  type = "list"
+}
+variable "cache_name" {}
+
+variable "engine_version" {
+  default = "2.8.22"
+}
+
+variable "instance_type" {
+  default = "cache.t2.micro"
+}
+
+variable "maintenance_window" {
+  default = "sun:05:00-sun:06:00"
+}