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main.tf
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# Terraform module which creates Redis ElastiCache resources on AWS.
#
# https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/WhatIs.html
# https://www.terraform.io/docs/providers/aws/r/elasticache_replication_group.html
resource "aws_elasticache_replication_group" "default" {
engine = "redis"
parameter_group_name = aws_elasticache_parameter_group.default.name
subnet_group_name = var.subnet_group_name == null ? aws_elasticache_subnet_group.default[0].name : var.subnet_group_name
security_group_ids = [aws_security_group.default.id]
# The replication group identifier. This parameter is stored as a lowercase string.
#
# - Must contain from 1 to 20 alphanumeric characters or hyphens.
# - Must begin with a letter.
# - Cannot contain two consecutive hyphens.
# - Cannot end with a hyphen.
#
# https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/Clusters.Create.CON.Redis.html
replication_group_id = var.name
# The number of clusters this replication group initially has.
# If automatic_failover_enabled is true, the value of this parameter must be at least 2.
# The maximum permitted value for number_cache_clusters is 6 (1 primary plus 5 replicas).
# https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/Scaling.RedisReplGrps.html
num_cache_clusters = var.number_cache_clusters
# The compute and memory capacity of the nodes in the node group (shard).
# Generally speaking, the current generation types provide more memory and computational power at lower cost
# when compared to their equivalent previous generation counterparts.
# https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/CacheNodes.SupportedTypes.html
node_type = var.node_type
# The version number of the cache engine to be used for the clusters in this replication group.
# You can upgrade to a newer engine version, but you cannot downgrade to an earlier engine version.
# https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/supported-engine-versions.html
engine_version = var.engine_version
# The port number on which each member of the replication group accepts connections.
# Redis default port is 6379.
port = var.port
# Every cluster and replication group has a weekly maintenance window during which any system changes are applied.
# Specifies the weekly time range during which maintenance on the cluster is performed.
# It is specified as a range in the format ddd:hh24:mi-ddd:hh24:mi. (Example: "sun:23:00-mon:01:30")
# The minimum maintenance window is a 60 minute period.
# https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/maintenance-window.html
maintenance_window = var.maintenance_window
# A period during each day when ElastiCache will begin creating a backup.
# The minimum length for the backup window is 60 minutes.
# If you do not specify a backup window, ElastiCache will assign one automatically.
# https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/backups-automatic.html
snapshot_window = var.snapshot_window
# The number of days the backup will be retained in Amazon S3.
# The maximum backup retention limit is 35 days.
# If the backup retention limit is set to 0, automatic backups are disabled for the cluster.
# https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/backups-automatic.html
snapshot_retention_limit = var.snapshot_retention_limit
# You can enable Multi-AZ with Automatic Failover only on Redis (cluster mode disabled) clusters that have at least
# one available read replica. Clusters without read replicas do not provide high availability or fault tolerance.
# https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/AutoFailover.html
automatic_failover_enabled = var.automatic_failover_enabled
multi_az_enabled = var.multi_az_enabled
# Redis at-rest encryption is an optional feature to increase data security by encrypting on-disk data during sync
# and backup or snapshot operations. Because there is some processing needed to encrypt and decrypt the data,
# enabling at-rest encryption can have some performance impact during these operations.
# You should benchmark your data with and without at-rest encryption to determine the performance impact for your use cases.
# https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/at-rest-encryption.html
at_rest_encryption_enabled = var.at_rest_encryption_enabled
# ElastiCache in-transit encryption is an optional feature that allows you to increase the security of your data at
# its most vulnerable points—when it is in transit from one location to another. Because there is some processing
# needed to encrypt and decrypt the data at the endpoints, enabling in-transit encryption can have some performance impact.
# You should benchmark your data with and without in-transit encryption to determine the performance impact for your use cases.
# https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/in-transit-encryption.html
transit_encryption_enabled = var.transit_encryption_enabled
# The password used to access a password protected server. Can be specified only if transit_encryption_enabled = true
auth_token = var.auth_token == null ? null : var.auth_token
# If true, this parameter causes the modifications in this request and any pending modifications to be applied,
# asynchronously and as soon as possible, regardless of the maintenance_window setting for the replication group.
# apply_immediately applies only to modifications in node type, engine version, and changing the number of nodes in a cluster.
# Other modifications, such as changing the maintenance window, are applied immediately.
# https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/Clusters.Modify.html
apply_immediately = var.apply_immediately
# A user-created description for the replication group.
description = var.description
# A mapping of tags to assign to the resource.
tags = merge({ "Name" = var.name }, var.tags)
}
# https://www.terraform.io/docs/providers/aws/r/elasticache_parameter_group.html
resource "aws_elasticache_parameter_group" "default" {
name = var.name
family = var.family
description = var.description
tags = merge({ "Name" = var.name }, var.tags)
}
# https://www.terraform.io/docs/providers/aws/r/elasticache_subnet_group.html
resource "aws_elasticache_subnet_group" "default" {
count = var.subnet_group_name == null ? 1 : 0
name = var.name
subnet_ids = var.subnet_ids
description = var.description
}
# https://www.terraform.io/docs/providers/aws/r/security_group.html
resource "aws_security_group" "default" {
name = local.security_group_name
vpc_id = var.vpc_id
tags = merge({ "Name" = local.security_group_name }, var.tags)
}
locals {
security_group_name = "${var.name}-elasticache-redis"
}
# https://www.terraform.io/docs/providers/aws/r/security_group_rule.html
resource "aws_security_group_rule" "ingress" {
type = "ingress"
from_port = var.port
to_port = var.port
protocol = "tcp"
cidr_blocks = var.source_cidr_blocks
security_group_id = aws_security_group.default.id
}
resource "aws_security_group_rule" "egress" {
type = "egress"
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = var.destination_cidr_blocks == [] ? ["0.0.0.0/0"] : var.destination_cidr_blocks
security_group_id = aws_security_group.default.id
}