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Init (#1)
* Initial * Added redis * Added redis * Added redis * Added redis * Use default param group * Use default param group * Use default param group * Fix redis * Fix redis * Fix redis * Fix redis * Fix redis * Fix redis * Fix redis * Fix redis * Fix redis * Fix redis * Fix default value * Fix default value * Update main.tf * Address PR comments * Update LICENSE * Update README.md * Update LICENSE * Update README.md
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‎LICENSE‎

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Apache License
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Version 2.0, January 2004
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http://www.apache.org/licenses/
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APPENDIX: How to apply the Apache License to your work.
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To apply the Apache License to your work, attach the following
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boilerplate notice, with the fields enclosed by brackets "{}"
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boilerplate notice, with the fields enclosed by brackets "[]"
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replaced with your own identifying information. (Don't include
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the brackets!) The text should be enclosed in the appropriate
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comment syntax for the file format. We also recommend that a
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file or class name and description of purpose be included on the
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same "printed page" as the copyright notice for easier
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identification within third-party archives.
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Copyright {yyyy} {name of copyright owner}
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Copyright 2017 Cloud Posse, LLC
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.

‎README.md‎

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# tf_redis
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# tf_redis
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Terraform module to provision a ElastiCache Redis Cluster
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## Usage
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Include this repository as a module in your existing terraform code:
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```
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module "example_redis" {
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source = "git::https://github.com/cloudposse/tf_redis.git?ref=tags/0.1.0"
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namespace = "general"
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name = "redis"
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stage = "prod"
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zone_id = "${var.route52_zone_id}"
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security_groups = ["${var.security_group_id}"]
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vpc_id = "${var.vpc_id}"
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subnets = "${var.private_subnets}"
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maintenance_window = "wed:03:00-wed:04:00"
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cluster_size = "2"
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instance_type = "cache.t2.micro"
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engine_version = "3.2.4"
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alarm_cpu_threshold_percent = "${var.cache_alarm_cpu_threshold_percent}"
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alarm_memory_threshold_bytes = "${var.cache_alarm_memory_threshold_bytes}"
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apply_immediately = "true"
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availability_zones = "${var.availability_zones}"
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automatic_failover = "false"
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}
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```
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## Input
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| Name | Default | Decription |
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|:----------------------------:|:-------------------:|:------------------------------------------------------:|
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| namespace |global |Namespace |
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| stage |default |Stage |
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| name |redis |Name |
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| security_groups |[] |AWS security group ids |
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| vpc_id |__REQUIRED__ |AWS VPC id |
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| subnets | [] | AWS subnet ids |
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| cluster_size | 1 | Count of nodes in cluster |
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| instance_type | cache.t2.micro | Elastic cache instance type |
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| family | redis3.2 | Redis family |
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| engine_version | 3.2.4 | Redis engine version |
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| port | 6379 | Redis port |
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| maintenance_window | wed:03:00-wed:04:00 | Maintenance window |
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| notification_topic_arn | | Notificate topic arn |
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| alarm_cpu_threshold_percent | 75 | CPU threshold alarm level |
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| alarm_memory_threshold_bytes | 10000000 | Ram threshold alarm level |
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| alarm_actions | [] | Alarm action list |
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| apply_immediately | true | Apply changes immediately |
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| automatic_failover | false | Automatic failover (Not available for T1/T2 instances) |
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| availability_zones | [] | Availability zone ids |
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| zone_id | false | Route53 dns zone id |
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## Output
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| Name | Decription |
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|:-----------------:|:-----------------:|
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| id | Redis cluster id |
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| security_group_id | Security group id |
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| host | Redis host |
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| port | Redis port |
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‎main.tf‎

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# Define composite variables for resources
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module "label" {
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source = "git::https://github.com/cloudposse/tf_label.git?ref=tags/0.1.0"
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namespace = "${var.namespace}"
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name = "${var.name}"
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stage = "${var.stage}"
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}
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#
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# Security Group Resources
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#
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resource "aws_security_group" "default" {
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vpc_id = "${var.vpc_id}"
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name = "${module.label.id}"
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ingress {
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from_port = "${var.port}" # Redis
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to_port = "${var.port}"
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protocol = "tcp"
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security_groups = ["${var.security_groups}"]
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}
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egress {
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from_port = 0
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to_port = 0
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protocol = "-1"
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cidr_blocks = ["0.0.0.0/0"]
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}
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tags {
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Name = "${module.label.id}"
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Namespace = "${var.namespace}"
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Stage = "${var.stage}"
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}
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}
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resource "aws_elasticache_subnet_group" "default" {
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name = "${module.label.id}"
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subnet_ids = ["${var.subnets}"]
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}
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resource "aws_elasticache_parameter_group" "default" {
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name = "${module.label.id}"
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family = "${var.family}"
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}
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resource "aws_elasticache_replication_group" "default" {
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replication_group_id = "${module.label.id}"
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replication_group_description = "${module.label.id}"
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node_type = "${var.instance_type}"
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number_cache_clusters = "${var.cluster_size}"
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port = "${var.port}"
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parameter_group_name = "${aws_elasticache_parameter_group.default.name}"
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availability_zones = ["${slice(var.availability_zones, 0, var.cluster_size)}"]
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automatic_failover_enabled = "${var.automatic_failover}"
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subnet_group_name = "${aws_elasticache_subnet_group.default.name}"
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security_group_ids = ["${aws_security_group.default.id}"]
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maintenance_window = "${var.maintenance_window}"
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notification_topic_arn = "${var.notification_topic_arn}"
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tags = "${module.label.tags}"
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}
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#
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# CloudWatch Resources
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#
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resource "aws_cloudwatch_metric_alarm" "cache_cpu" {
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alarm_name = "${module.label.id}-cpu-utilization"
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alarm_description = "Redis cluster CPU utilization"
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comparison_operator = "GreaterThanThreshold"
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evaluation_periods = "1"
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metric_name = "CPUUtilization"
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namespace = "AWS/ElastiCache"
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period = "300"
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statistic = "Average"
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threshold = "${var.alarm_cpu_threshold_percent}"
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dimensions {
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CacheClusterId = "${module.label.id}"
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}
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alarm_actions = ["${var.alarm_actions}"]
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depends_on = ["aws_elasticache_replication_group.default"]
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}
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resource "aws_cloudwatch_metric_alarm" "cache_memory" {
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alarm_name = "${module.label.id}-freeable-memory"
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alarm_description = "Redis cluster freeable memory"
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comparison_operator = "LessThanThreshold"
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evaluation_periods = "1"
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metric_name = "FreeableMemory"
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namespace = "AWS/ElastiCache"
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period = "60"
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statistic = "Average"
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threshold = "${var.alarm_memory_threshold_bytes}"
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dimensions {
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CacheClusterId = "${module.label.id}"
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}
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alarm_actions = ["${var.alarm_actions}"]
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depends_on = ["aws_elasticache_replication_group.default"]
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}
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module "dns" {
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source = "git::https://github.com/cloudposse/tf_hostname.git?ref=tags/0.1.0"
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namespace = "${var.namespace}"
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name = "${var.name}"
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stage = "${var.stage}"
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ttl = 60
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zone_id = "${var.zone_id}"
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records = ["${aws_elasticache_replication_group.default.primary_endpoint_address}"]
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}

‎output.tf‎

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output "id" {
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value = "${aws_elasticache_replication_group.default.id}"
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}
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output "security_group_id" {
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value = "${aws_security_group.default.id}"
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}
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output "port" {
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value = "11211"
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}
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output "host" {
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value = "${module.dns.hostname}"
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}
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‎variables.tf‎

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variable "namespace" {
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default = "global"
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}
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variable "stage" {
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default = "default"
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}
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variable "name" {
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default = "redis"
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}
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variable "security_groups" {
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type = "list"
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}
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variable "vpc_id" {
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default = ""
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}
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variable "subnets" {
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type = "list"
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default = []
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}
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variable "maintenance_window" {
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default = "wed:03:00-wed:04:00"
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}
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variable "cluster_size" {
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default = "1"
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}
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variable "port" {
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default = "6379"
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}
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variable "instance_type" {
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default = "cache.t2.micro"
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}
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variable "family" {
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default = "redis3.2"
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}
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variable "engine_version" {
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default = "3.2.4"
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}
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variable "notification_topic_arn" {
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default = ""
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}
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variable "alarm_cpu_threshold_percent" {
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default = "75"
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}
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variable "alarm_memory_threshold_bytes" {
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# 10MB
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default = "10000000"
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}
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variable "alarm_actions" {
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type = "list"
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default = []
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}
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variable "apply_immediately" {
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default = "true"
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}
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variable "automatic_failover" {
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default = "false"
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}
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variable "availability_zones" {
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type = "list"
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}
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variable "zone_id" {}

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