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Terraform module to provision an ElastiCache Redis Cluster


This project is part of our comprehensive "SweetOps" approach towards DevOps.

Terraform Open Source Modules

It's 100% Open Source and licensed under the APACHE2.

We literally have hundreds of terraform modules that are Open Source and well-maintained. Check them out!

Usage

IMPORTANT: The master branch is used in source just as an example. In your code, do not pin to master because there may be breaking changes between releases. Instead pin to the release tag (e.g. ?ref=tags/x.y.z) of one of our latest releases.

For a complete example, see examples/complete.

For automated tests of the complete example using bats and Terratest (which tests and deploys the example on AWS), see test.

  provider "aws" {
    region = var.region
  }

  module "vpc" {
    source     = "git::https://github.com/cloudposse/terraform-aws-vpc.git?ref=tags/0.8.1"
    namespace  = var.namespace
    stage      = var.stage
    name       = var.name
    cidr_block = "172.16.0.0/16"
  }

  module "subnets" {
    source               = "git::https://github.com/cloudposse/terraform-aws-dynamic-subnets.git?ref=tags/0.18.1"
    availability_zones   = var.availability_zones
    namespace            = var.namespace
    stage                = var.stage
    name                 = var.name
    vpc_id               = module.vpc.vpc_id
    igw_id               = module.vpc.igw_id
    cidr_block           = module.vpc.vpc_cidr_block
    nat_gateway_enabled  = true
    nat_instance_enabled = false
  }

  module "redis" {
    source                     = "git::https://github.com/cloudposse/terraform-aws-elasticache-redis.git?ref=master"
    availability_zones         = var.availability_zones
    namespace                  = var.namespace
    stage                      = var.stage
    name                       = var.name
    zone_id                    = var.zone_id
    vpc_id                     = module.vpc.vpc_id
    allowed_security_groups    = [module.vpc.vpc_default_security_group_id]
    subnets                    = module.subnets.private_subnet_ids
    cluster_size               = var.cluster_size
    instance_type              = var.instance_type
    apply_immediately          = true
    automatic_failover         = false
    engine_version             = var.engine_version
    family                     = var.family
    at_rest_encryption_enabled = var.at_rest_encryption_enabled
    transit_encryption_enabled = var.transit_encryption_enabled

    parameter = [
      {
        name  = "notify-keyspace-events"
        value = "lK"
      }
    ]
  }

Examples

Review the complete example to see how to use this module.

Makefile Targets

Available targets:

  help                                Help screen
  help/all                            Display help for all targets
  help/short                          This help short screen
  lint                                Lint terraform code

Inputs

Name Description Type Default Required
alarm_actions Alarm action list list(string) <list> no
alarm_cpu_threshold_percent CPU threshold alarm level number 75 no
alarm_memory_threshold_bytes Ram threshold alarm level number 10000000 no
allowed_cidr_blocks List of CIDR blocks that are allowed ingress to the cluster's Security Group created in the module list(string) <list> no
allowed_security_groups List of Security Group IDs that are allowed ingress to the cluster's Security Group created in the module list(string) <list> no
apply_immediately Apply changes immediately bool true no
at_rest_encryption_enabled Enable encryption at rest bool false no
attributes Additional attributes (e.g. "1") list(string) <list> no
auth_token Auth token for password protecting redis, transit_encryption_enabled must be set to true. Password must be longer than 16 chars string null no
automatic_failover_enabled Automatic failover (Not available for T1/T2 instances) bool false no
availability_zones Availability zone IDs list(string) <list> no
cluster_mode_enabled Flag to enable/disable creation of a native redis cluster. automatic_failover_enabled must be set to true. Only 1 cluster_mode block is allowed bool false no
cluster_mode_num_node_groups Number of node groups (shards) for this Redis replication group. Changing this number will trigger an online resizing operation before other settings modifications number 0 no
cluster_mode_replicas_per_node_group Number of replica nodes in each node group. Valid values are 0 to 5. Changing this number will force a new resource number 0 no
cluster_size Number of nodes in cluster. Ignored when cluster_mode_enabled == true number 1 no
delimiter Delimiter between name, namespace, stage and attributes string - no
dns_subdomain The subdomain to use for the CNAME record. If not provided then the CNAME record will use var.name. string `` no
elasticache_subnet_group_name Subnet group name for the ElastiCache instance string `` no
enabled Set to false to prevent the module from creating any resources bool true no
engine_version Redis engine version string 4.0.10 no
existing_security_groups List of existing Security Group IDs to place the cluster into. Set use_existing_security_groups to true to enable using existing_security_groups as Security Groups for the cluster list(string) <list> no
family Redis family string redis4.0 no
instance_type Elastic cache instance type string cache.t2.micro no
maintenance_window Maintenance window string wed:03:00-wed:04:00 no
name Name of the application string - yes
namespace Namespace (e.g. eg or cp) string `` no
notification_topic_arn Notification topic arn string `` no
ok_actions The list of actions to execute when this alarm transitions into an OK state from any other state. Each action is specified as an Amazon Resource Number (ARN) list(string) <list> no
parameter A list of Redis parameters to apply. Note that parameters may differ from one Redis family to another object <list> no
port Redis port number 6379 no
replication_group_id Replication group ID with the following constraints: A name must contain from 1 to 20 alphanumeric characters or hyphens. The first character must be a letter. A name cannot end with a hyphen or contain two consecutive hyphens. string `` no
snapshot_retention_limit The number of days for which ElastiCache will retain automatic cache cluster snapshots before deleting them. number 0 no
snapshot_window The daily time range (in UTC) during which ElastiCache will begin taking a daily snapshot of your cache cluster. string 06:30-07:30 no
stage Stage (e.g. prod, dev, staging) string `` no
subnets Subnet IDs list(string) <list> no
tags Additional tags (e.g. map("BusinessUnit","ABC") map(string) <map> no
transit_encryption_enabled Enable TLS bool true no
use_existing_security_groups Flag to enable/disable creation of Security Group in the module. Set to true to disable Security Group creation and provide a list of existing security Group IDs in existing_security_groups to place the cluster into bool false no
vpc_id VPC ID string - yes
zone_id Route53 DNS Zone ID string `` no

Outputs

Name Description
endpoint Redis primary endpoint
host Redis hostname
id Redis cluster ID
port Redis port
security_group_id Security group ID

Help

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Contributing

Bug Reports & Feature Requests

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Developing

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In general, PRs are welcome. We follow the typical "fork-and-pull" Git workflow.

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  2. Clone the project to your own machine
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  4. Push your work back up to your fork
  5. Submit a Pull Request so that we can review your changes

NOTE: Be sure to merge the latest changes from "upstream" before making a pull request!

Copyright

Copyright © 2017-2020 Cloud Posse, LLC

License

License

See LICENSE for full details.

Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

  https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied.  See the License for the
specific language governing permissions and limitations
under the License.

Trademarks

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About

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Contributors

Erik Osterman
Erik Osterman
Igor Rodionov
Igor Rodionov
Andriy Knysh
Andriy Knysh
Daren Desjardins
Daren Desjardins
Max Moon
Max Moon
Christopher Riley
Christopher Riley

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Terraform module to provision an ElastiCache Redis Cluster

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