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Terraform module to provision an ElastiCache Memcached Cluster

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Usage

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 "this" {
    source  = "cloudposse/label/null"
    # Cloud Posse recommends pinning every module to a specific version
    # version = "x.x.x"
    namespace  = var.namespace
    stage      = var.stage
    name       = var.name
  }

  module "vpc" {
    source = "cloudposse/vpc/aws"
    # Cloud Posse recommends pinning every module to a specific version
    # version = "x.x.x"

    cidr_block = "172.16.0.0/16"

    context = module.this.context
  }

  module "subnets" {
    source = "cloudposse/dynamic-subnets/aws"
    # Cloud Posse recommends pinning every module to a specific version
    # version = "x.x.x"

    availability_zones   = var.availability_zones
    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

    context = module.this.context
  }

  module "memcached" {
    source = "cloudposse/elasticache-memcached/aws"
    # Cloud Posse recommends pinning every module to a specific version
    # version = "x.x.x"

    availability_zones      = var.availability_zones
    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
    engine_version          = var.engine_version
    apply_immediately       = true
    zone_id                 = var.zone_id

    elasticache_parameter_group_family = var.elasticache_parameter_group_family

    context = module.this.context
  }

Important

In Cloud Posse's examples, we avoid pinning modules to specific versions to prevent discrepancies between the documentation and the latest released versions. However, for your own projects, we strongly advise pinning each module to the exact version you're using. This practice ensures the stability of your infrastructure. Additionally, we recommend implementing a systematic approach for updating versions to avoid unexpected changes.

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

Requirements

Name Version
terraform >= 1.0.0
aws >= 5.16
null >= 3.0

Providers

Name Version
aws >= 5.16
null >= 3.0

Modules

Name Source Version
aws_security_group cloudposse/security-group/aws 2.2.0
dns cloudposse/route53-cluster-hostname/aws 0.13.0
this cloudposse/label/null 0.25.0

Resources

Name Type
aws_cloudwatch_metric_alarm.cache_cpu resource
aws_cloudwatch_metric_alarm.cache_memory resource
aws_elasticache_cluster.default resource
aws_elasticache_parameter_group.default resource
aws_elasticache_subnet_group.default resource
null_resource.cluster_urls resource

Inputs

Name Description Type Default Required
additional_security_group_rules A list of Security Group rule objects to add to the created security group, in addition to the ones
this module normally creates. (To suppress the module's rules, set create_security_group to false
and supply your own security group via associated_security_group_ids.)
The keys and values of the objects are fully compatible with the aws_security_group_rule resource, except
for security_group_id which will be ignored, and the optional "key" which, if provided, must be unique and known at "plan" time.
To get more info see https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/security_group_rule .
list(any) [] no
additional_tag_map Additional key-value pairs to add to each map in tags_as_list_of_maps. Not added to tags or id.
This is for some rare cases where resources want additional configuration of tags
and therefore take a list of maps with tag key, value, and additional configuration.
map(string) {} no
alarm_actions Alarm actions list(string) [] no
alarm_cpu_threshold_percent CPU threshold alarm level number 75 no
alarm_memory_threshold_bytes Alarm memory threshold bytes number 10000000 no
allow_all_egress If true, the created security group will allow egress on all ports and protocols to all IP address.
If this is false and no egress rules are otherwise specified, then no egress will be allowed.
bool true no
allowed_cidr_blocks A list of IPv4 CIDRs to allow access to the security group created by this module.
The length of this list must be known at "plan" time.
list(string) [] no
allowed_ipv6_cidr_blocks A list of IPv6 CIDRs to allow access to the security group created by this module.
The length of this list must be known at "plan" time.
list(string) [] no
allowed_ipv6_prefix_list_ids A list of IPv6 Prefix Lists IDs to allow access to the security group created by this module.
The length of this list must be known at "plan" time.
list(string) [] no
allowed_security_group_ids A list of IDs of Security Groups to allow access to the security group created by this module.
The length of this list must be known at "plan" time.
list(string) [] no
allowed_security_groups DEPRECATED: Use allowed_security_group_ids instead. list(string) [] no
apply_immediately Specifies whether any database modifications are applied immediately, or during the next maintenance window bool true no
associated_security_group_ids A list of IDs of Security Groups to associate the created resource with, in addition to the created security group.
These security groups will not be modified and, if create_security_group is false, must have rules providing the desired access.
list(string) [] no
attributes ID element. Additional attributes (e.g. workers or cluster) to add to id,
in the order they appear in the list. New attributes are appended to the
end of the list. The elements of the list are joined by the delimiter
and treated as a single ID element.
list(string) [] no
availability_zone The Availability Zone of the cluster. az_mode must be set to single-az when used. string "" no
availability_zones List of Availability Zones for the cluster. az_mode must be set to cross-az when used. list(string) [] no
az_mode Enable or disable multiple AZs, eg: single-az or cross-az string "single-az" no
cloudwatch_metric_alarms_enabled Boolean flag to enable/disable CloudWatch metrics alarms bool false no
cluster_size Cluster size number 1 no
context Single object for setting entire context at once.
See description of individual variables for details.
Leave string and numeric variables as null to use default value.
Individual variable settings (non-null) override settings in context object,
except for attributes, tags, and additional_tag_map, which are merged.
any
{
"additional_tag_map": {},
"attributes": [],
"delimiter": null,
"descriptor_formats": {},
"enabled": true,
"environment": null,
"id_length_limit": null,
"label_key_case": null,
"label_order": [],
"label_value_case": null,
"labels_as_tags": [
"unset"
],
"name": null,
"namespace": null,
"regex_replace_chars": null,
"stage": null,
"tags": {},
"tenant": null
}
no
create_security_group Set true to create and configure a new security group. If false, associated_security_group_ids must be provided. bool true no
delimiter Delimiter to be used between ID elements.
Defaults to - (hyphen). Set to "" to use no delimiter at all.
string null no
descriptor_formats Describe additional descriptors to be output in the descriptors output map.
Map of maps. Keys are names of descriptors. Values are maps of the form
{<br/> format = string<br/> labels = list(string)<br/>}
(Type is any so the map values can later be enhanced to provide additional options.)
format is a Terraform format string to be passed to the format() function.
labels is a list of labels, in order, to pass to format() function.
Label values will be normalized before being passed to format() so they will be
identical to how they appear in id.
Default is {} (descriptors output will be empty).
any {} 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_parameter_group_family ElastiCache parameter group family string "memcached1.5" 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 null no
engine_version Memcached engine version. For more info, see https://docs.aws.amazon.com/AmazonElastiCache/latest/mem-ug/supported-engine-versions.html string "1.5.16" no
environment ID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT' string null no
existing_security_groups DEPRECATED: Use associated_security_group_ids instead.
Historical description: 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) [] no
id_length_limit Limit id to this many characters (minimum 6).
Set to 0 for unlimited length.
Set to null for keep the existing setting, which defaults to 0.
Does not affect id_full.
number null no
instance_type Elastic cache instance type string "cache.t2.micro" no
label_key_case Controls the letter case of the tags keys (label names) for tags generated by this module.
Does not affect keys of tags passed in via the tags input.
Possible values: lower, title, upper.
Default value: title.
string null no
label_order The order in which the labels (ID elements) appear in the id.
Defaults to ["namespace", "environment", "stage", "name", "attributes"].
You can omit any of the 6 labels ("tenant" is the 6th), but at least one must be present.
list(string) null no
label_value_case Controls the letter case of ID elements (labels) as included in id,
set as tag values, and output by this module individually.
Does not affect values of tags passed in via the tags input.
Possible values: lower, title, upper and none (no transformation).
Set this to title and set delimiter to "" to yield Pascal Case IDs.
Default value: lower.
string null no
labels_as_tags Set of labels (ID elements) to include as tags in the tags output.
Default is to include all labels.
Tags with empty values will not be included in the tags output.
Set to [] to suppress all generated tags.
Notes:
The value of the name tag, if included, will be the id, not the name.
Unlike other null-label inputs, the initial setting of labels_as_tags cannot be
changed in later chained modules. Attempts to change it will be silently ignored.
set(string)
[
"default"
]
no
maintenance_window Maintenance window string "wed:03:00-wed:04:00" no
max_item_size Max item size number 10485760 no
name ID element. Usually the component or solution name, e.g. 'app' or 'jenkins'.
This is the only ID element not also included as a tag.
The "name" tag is set to the full id string. There is no tag with the value of the name input.
string null no
namespace ID element. Usually an abbreviation of your organization name, e.g. 'eg' or 'cp', to help ensure generated IDs are globally unique string null no
network_type The network type of the cluster. Valid values: ipv4, ipv6, dual_stack. string "ipv4" no
notification_topic_arn Notification topic arn string "" no
port Memcached port number 11211 no
regex_replace_chars Terraform regular expression (regex) string.
Characters matching the regex will be removed from the ID elements.
If not set, "/[^a-zA-Z0-9-]/" is used to remove all characters other than hyphens, letters and digits.
string null no
security_group_create_before_destroy Set true to enable Terraform create_before_destroy behavior on the created security group.
We only recommend setting this false if you are upgrading this module and need to keep
the existing security group from being replaced.
Note that changing this value will always cause the security group to be replaced.
bool true no
security_group_create_timeout How long to wait for the security group to be created. string "10m" no
security_group_delete_timeout How long to retry on DependencyViolation errors during security group deletion. string "15m" no
security_group_description The description to assign to the created Security Group.
Warning: Changing the description causes the security group to be replaced.
string "Security group for Elasticache Memcached" no
security_group_name The name to assign to the created security group. Must be unique within the VPC.
If not provided, will be derived from the null-label.context passed in.
If create_before_destroy is true, will be used as a name prefix.
list(string) [] no
stage ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release' string null no
subnets AWS subnet ids list(string) [] no
tags Additional tags (e.g. {'BusinessUnit': 'XYZ'}).
Neither the tag keys nor the tag values will be modified by this module.
map(string) {} no
tenant ID element _(Rarely used, not included by default)_. A customer identifier, indicating who this instance of a resource is for string null no
transit_encryption_enabled Boolean flag to enable transit encryption (requires Memcached version 1.6.12+) bool false no
use_existing_security_groups DEPRECATED: Use create_security_group instead.
Historical description: 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.
Historical default: false
bool null no
vpc_id VPC ID string "" no
zone_id Route53 DNS Zone ID string "" no

Outputs

Name Description
cluster_address Cluster address
cluster_configuration_endpoint Cluster configuration endpoint
cluster_id Cluster ID
cluster_urls Cluster URLs
hostname Cluster hostname
security_group_arn The ARN of the created security group
security_group_id The ID of the created security group
security_group_name The name of the created security group

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This project is under active development, and we encourage contributions from our community.

Many thanks to our outstanding contributors:

For πŸ› bug reports & feature requests, please use the issue tracker.

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

  1. Review our Code of Conduct and Contributor Guidelines.
  2. Fork the repo on GitHub
  3. Clone the project to your own machine
  4. Commit changes to your own branch
  5. Push your work back up to your fork
  6. 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!

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License

License

Preamble to the Apache License, Version 2.0

Complete license is available in the LICENSE file.

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

All other trademarks referenced herein are the property of their respective owners.


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