main.tf

data "aws_vpc" "vpc" {
  id = "${var.vpc_id}"
}

resource "aws_elasticache_replication_group" "redis" {
  replication_group_id          = "${format("%.20s","${var.name}-${var.env}")}"
  replication_group_description = "Terraform-managed ElastiCache replication group for ${var.name}-${data.aws_vpc.vpc.tags["Name"]}"
  number_cache_clusters         = "${var.redis_clusters}"
  node_type                     = "${var.redis_node_type}"
  automatic_failover_enabled    = "${var.redis_failover}"
  engine_version                = "${var.redis_version}"
  port                          = "${var.redis_port}"
  parameter_group_name          = "${aws_elasticache_parameter_group.redis_parameter_group.id}"
  subnet_group_name             = "${aws_elasticache_subnet_group.redis_subnet_group.id}"
  security_group_ids            = ["${aws_security_group.redis_security_group.id}"]
  apply_immediately             = "${var.apply_immediately}"
}

resource "aws_elasticache_parameter_group" "redis_parameter_group" {
  name = "${replace(format("%.255s", lower(replace("tf-redis-${var.name}-${data.aws_vpc.vpc.tags["Name"]}", "_", "-"))), "/\\s/", "-")}"
  description = "Terraform-managed ElastiCache parameter group for ${var.name}-${data.aws_vpc.vpc.tags["Name"]}"
  family      = "redis${replace(var.redis_version, "/\\.[\\d]+$/","")}" # Strip the patch version from redis_version var
}

resource "aws_elasticache_subnet_group" "redis_subnet_group" {
  name = "${replace(format("%.255s", lower(replace("tf-redis-${var.name}-${data.aws_vpc.vpc.tags["Name"]}", "_", "-"))), "/\\s/", "-")}"
  subnet_ids = ["${var.subnets}"]
}