Initial commit

.gitlab-ci.yml

+image: alpine:latest
+
+variables:
+  TERRAFORM_URL: "https://releases.hashicorp.com/terraform/0.7.1/terraform_0.7.1_linux_amd64.zip"
+
+before_script:
+  - apk update && apk add ca-certificates && update-ca-certificates && apk add openssl
+  - wget -O /tmp/terraform.zip $TERRAFORM_URL
+  - unzip /tmp/terraform.zip -d /usr/local/bin 
+
+test:
+  script: terraform validate

main.tf

+#############################################################################################################
+# Variables
+#############################################################################################################
+variable "vpc_id" {}
+variable "security_groups" {
+  type = "list"
+}
+
+variable "subnet_ids" {
+  type = "list"
+}
+
+variable "cache_name" {}
+variable "cache_nodes" {
+  default = "2"
+}
+variable "az_mode" {
+  default = "cross-az"
+}
+variable "engine_version" {
+  default = "1.4.24"
+}
+variable "instance_type" {
+  default = "cache.t2.micro"
+}
+variable "port" {
+  default = "11211"
+}
+
+variable "maintenance_window" {
+  default = "sun:01:00-sun:02:00"
+}
+variable "dns_zone" {}
+# variable "alarm_actions" {}
+
+
+############################################################################################################
+# Security Group
+#############################################################################################################
+
+resource "aws_security_group" "memcached" {
+  vpc_id      = "${var.vpc_id}"
+  description = "ElastiCache SG"
+
+  ingress {
+    from_port       = 11211
+    to_port         = 11211
+    protocol        = "tcp"
+    security_groups = ["${var.security_groups}"]
+  }
+  tags = {
+    Name = "${var.cache_name}"
+  }
+}
+
+############################################################################################################
+# Subnet Group
+#############################################################################################################
+
+resource "aws_elasticache_subnet_group" "default" {
+  name        = "${var.cache_name}-subnet-group"
+  description = "Private subnets for the ElastiCache instances"
+  subnet_ids  = ["${var.subnet_ids}"]
+}
+
+############################################################################################################
+# Elasticache Cluster
+#############################################################################################################
+
+resource "aws_elasticache_cluster" "memcached" {
+  cluster_id = "${var.cache_name}"
+  engine = "memcached"
+  engine_version = "${var.engine_version}"
+  maintenance_window = "${var.maintenance_window}"
+  node_type = "${var.instance_type}"
+  num_cache_nodes = "${var.cache_nodes}"
+  az_mode = "${var.az_mode}"
+  parameter_group_name = "default.memcached1.4"
+  port = "${var.port}"
+  subnet_group_name = "${aws_elasticache_subnet_group.default.name}"
+  security_group_ids = ["${aws_security_group.memcached.id}"]
+
+  tags {
+    Name = "CacheCluster"
+  }
+}
+
+############################################################################################################
+# Route53 record
+#############################################################################################################
+resource "aws_route53_record" "memcached" {
+  zone_id = "${var.dns_zone}"
+  name = "cache.cfg.${var.cache_name}.aws"
+  type = "CNAME"
+  ttl = "60"
+  records = ["${aws_elasticache_cluster.memcached.cluster_address}"]
+}
+
+############################################################################################################
+# Cloudwatch resources
+#############################################################################################################
+
+resource "aws_cloudwatch_metric_alarm" "cpu" {
+  alarm_name = "alarmCacheClusterCPUUtilization"
+  alarm_description = "Cache cluster CPU utilization"
+  comparison_operator = "GreaterThanThreshold"
+  evaluation_periods = "1"
+  metric_name = "CPUUtilization"
+  namespace = "AWS/ElastiCache"
+  period = "300"
+  statistic = "Average"
+  threshold = "75"
+  dimensions {
+    CacheClusterId = "${aws_elasticache_cluster.memcached.id}"
+  }
+  # alarm_actions = ["${split(",", var.alarm_actions)}"]
+}
+
+resource "aws_cloudwatch_metric_alarm" "memory_free" {
+  alarm_name = "alarmCacheClusterFreeableMemory"
+  alarm_description = "Cache cluster freeable memory"
+  comparison_operator = "LessThanThreshold"
+  evaluation_periods = "1"
+  metric_name = "FreeableMemory"
+  namespace = "AWS/ElastiCache"
+  period = "60"
+  statistic = "Average"
+  # 10MB in bytes
+  threshold = "10000000"
+  dimensions {
+    CacheClusterId = "${aws_elasticache_cluster.memcached.id}"
+  }
+  # alarm_actions = ["${split(",", var.alarm_actions)}"]
+}
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