Terraform module to setup all resources needed for an Elasticsearch cluster.

• [project]: String(required): The name of the project.
• [customer]: String(optional): The name of the customer.
• [environment]: String(required): The name of the environment (production, staging, development).
• [elb_es_ingress_sgs]: List(required): List of Security Groups which need access to the Elasticsearch port of the cluster.
• [vpc_id]: String(required): VPC ID where the proxies will be deployed.
• [subnet_ids]: List(required): Subnet IDs where the cluster will be deployed.
• [sg_all_id]: String(required): ID of the base security group.
• [ami]: String(required): AMI to be used for the Elasticsearch nodes.
• [key_name]: String(required): ID of the SSH key to use for the Elasticsearch nodes.
• [name]: String(optional, default "elasticsearch"): Name to use for the ELK setup.
• [cluster_size]: Number(optional, default 3): How many Elasticsearch nodes to deploy.
• [logstash_enabled]: Bool(optional, default false): Whether to enable Logstash listeners.
• [kibana_enabled]: Bool(optional, default false): Whether to enable Kibana listeners.
• [elasticsearch_port]: Number(optional, default 9200): Elasticsearch port.
• [elasticsearch_java_port]: Number(optional, default 9300): Elasticsearch JAVA API port.
• [logstash_port]: Number(optional, default 9600): Logstash port.
• [kibana_port]: Number(optional, default 5601): Kibana port.
• [elb_kibana_ingress_sgs]: List(optional): List of Security Groups which need access to the Kibana port of the cluster.
• [elb_logstash_ingress_sgs]: List(optional): List of Security Groups which need access to the Logstash port of the cluster.
• [instance_type]: String(optional, default "t2.small"): The instance type to launch for the Elasticsearch nodes.
• [termination_protection]: Bool(optional, default true): Whether to enable termination protection on the Elasticsearch nodes.
• [db_vl_type]: String(optional, default "gp2"): Type of the Elasticsearch data EBS volume.
• [db_vl_iops]: String(optional, default ""): The amount of provisioned IOPS. This is only valid for db_vl_type of "io1", and must be specified if using that type
• [db_vl_size]: Number(optional, default 100): Size in GB of the Elasticsearch data EBS volume.
• [db_vl_name]: String(optional, default "/dev/xvdg"): Volume device name of the Elasticsearch data EBS volume.
• [db_vl_encrypted]: String(optional, default "false"): Enables EBS encryption on the volume.
• [db_vl_delete_on_termination]: String(optional, default "true"): Delete the EBS volume when we terminate the instance.
• [elb_internal]: Bool(optional, default true): Whether the ELB should be internal only (not-public).
• [snapshot_s3_bucket_arn]: String(optional, default ""): The S3 bucket ARN where the ES snapshots will be stored, this is just to give the proper permissions to the EC2 instance profiles.
• [es_data_dir]: String(optional, default "/usr/share/elasticsearch/data/"): The directory where to mount the external volume, so this will be the directory where Elasticsearch will store the data.
• [cloudwatch_logs]: Boolean(optional, default false): Sets cloudwatch logs permissions to the elk instances role if enabled.

• [sg_id]: String: ID of the Elasticsearch instances Security Group.
• [sg_elb_id]: String: ID of the cluster's ELB Security Group.
• [elb_id]: String: ID of the cluster's ELB.
• [elb_dns_name]: String: DNS name of the cluster's ELB.
• [elb_zone_id]: String: Zone ID of the cluster's ELB.

module "elk_cluster" {
  source              = "github.com/skyscrapers/terraform-elk_cluster?ref=2.1.0"
  project             = "${var.project}"
  environment         = "${var.environment}"
  cluster_size        = 3
  logstash_enabled    = true
  kibana_enabled      = true
  ami                 = "ami-6c101b0a"
  instance_type       = "r3.large"
  key_name            = "mykey"
  vpc_id              = "${module.vpc.vpc_id}"
  subnet_ids          = "${module.vpc.private_db_subnets}"
  sg_all_id           = "${module.general_security_groups.sg_all_id}"
  elb_es_ingress_sgs  = ["${module.app.sg_id}"]
}