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Merged
flybayer merged 4 commits into from
Jun 17, 2026
Merged

add elasticache module #28

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1a1a97d
add elasticache module
flybayer Jun 17, 2026
af45bdc
fixes
flybayer Jun 17, 2026
bc3cc71
fix metrics
flybayer Jun 17, 2026
74dbf62
fixes
flybayer Jun 17, 2026
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67 changes: 42 additions & 25 deletions cache/elasticache/README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -20,9 +20,11 @@ Creates an ElastiCache cluster with support for Redis, Valkey, Memcached, and El
module "redis" {
source = "git::https://github.com/user/ravion-modules.git//cache/elasticache?ref=v1.0.0"

name = "my-redis"
engine = "redis"
node_type = "cache.t4g.micro"
name = "my-redis"
engine = "redis"
engine_major_version = "7"
engine_minor_version = "1"
node_type = "cache.t4g.micro"

vpc_id = module.vpc.vpc_id
subnet_ids = module.vpc.private_subnet_ids
Expand All @@ -41,10 +43,11 @@ module "redis" {
module "valkey" {
source = "git::https://github.com/user/ravion-modules.git//cache/elasticache?ref=v1.0.0"

name = "my-valkey"
engine = "valkey"
engine_version = "8.0"
node_type = "cache.r7g.large"
name = "my-valkey"
engine = "valkey"
engine_major_version = "8"
engine_minor_version = "0"
node_type = "cache.r7g.large"

replicas_per_node_group = 2
automatic_failover_enabled = true
Expand All @@ -68,6 +71,8 @@ module "redis_cluster" {

name = "my-redis-cluster"
engine = "redis"
engine_major_version = "7"
engine_minor_version = "1"
node_type = "cache.r7g.large"
cluster_mode_enabled = true
num_node_groups = 3
Expand All @@ -94,10 +99,12 @@ module "redis_cluster" {
module "memcached" {
source = "git::https://github.com/user/ravion-modules.git//cache/elasticache?ref=v1.0.0"

name = "my-memcached"
engine = "memcached"
node_type = "cache.t4g.micro"
num_cache_nodes = 3
name = "my-memcached"
engine = "memcached"
engine_major_version = "1.6"
engine_minor_version = "22"
node_type = "cache.t4g.micro"
num_cache_nodes = 3

vpc_id = module.vpc.vpc_id
subnet_ids = module.vpc.private_subnet_ids
Expand All @@ -112,9 +119,11 @@ module "memcached" {
module "redis_serverless" {
source = "git::https://github.com/user/ravion-modules.git//cache/elasticache?ref=v1.0.0"

name = "my-serverless-redis"
engine = "redis"
serverless_enabled = true
name = "my-serverless-redis"
engine = "redis"
engine_major_version = "7"
engine_minor_version = "1"
serverless_enabled = true

serverless_cache_usage_limits = {
data_storage_maximum = 10 # GB
Expand All @@ -134,9 +143,11 @@ module "redis_serverless" {
module "redis" {
source = "git::https://github.com/user/ravion-modules.git//cache/elasticache?ref=v1.0.0"

name = "my-redis"
engine = "redis"
node_type = "cache.t4g.small"
name = "my-redis"
engine = "redis"
engine_major_version = "7"
engine_minor_version = "1"
node_type = "cache.t4g.small"

vpc_id = module.vpc.vpc_id
subnet_ids = module.vpc.private_subnet_ids
Expand All @@ -159,9 +170,11 @@ module "redis" {
module "redis" {
source = "git::https://github.com/user/ravion-modules.git//cache/elasticache?ref=v1.0.0"

name = "my-redis"
engine = "redis"
node_type = "cache.t4g.micro"
name = "my-redis"
engine = "redis"
engine_major_version = "7"
engine_minor_version = "1"
node_type = "cache.t4g.micro"

vpc_id = module.vpc.vpc_id
subnet_ids = module.vpc.private_subnet_ids
Expand All @@ -178,9 +191,11 @@ module "redis" {
module "redis" {
source = "git::https://github.com/user/ravion-modules.git//cache/elasticache?ref=v1.0.0"

name = "my-redis"
engine = "redis"
node_type = "cache.r7g.large"
name = "my-redis"
engine = "redis"
engine_major_version = "7"
engine_minor_version = "1"
node_type = "cache.r7g.large"

vpc_id = module.vpc.vpc_id
subnet_ids = module.vpc.private_subnet_ids
Expand Down Expand Up @@ -217,8 +232,9 @@ module "redis" {
| vpc_id | The ID of the VPC where the ElastiCache cluster will be created. | `string` | n/a | yes |
| subnet_ids | A list of subnet IDs for the ElastiCache subnet group. | `list(string)` | n/a | yes |
| tags | A map of tags to assign to all resources. | `map(string)` | `{}` | no |
| engine | The cache engine to use: redis, valkey, or memcached. | `string` | `"redis"` | no |
| engine_version | The version number of the cache engine. | `string` | `null` | no |
| engine | The cache engine to use: redis, valkey, or memcached. | `string` | `"valkey"` | no |
| engine_major_version | The major version number of the cache engine. Current latest major versions include Valkey 9, Redis OSS 7, and Memcached 1.6. | `string` | n/a | yes |
| engine_minor_version | Minor or patch version appended to the major version. | `string` | n/a | yes |
| node_type | The compute and memory capacity of the nodes. | `string` | `"cache.t4g.micro"` | no |
| num_cache_nodes | The number of cache nodes (Memcached only). | `number` | `1` | no |
| num_node_groups | The number of node groups (shards) for Redis cluster mode. | `number` | `1` | no |
Expand Down Expand Up @@ -265,6 +281,7 @@ module "redis" {
|------|-------------|
| replication_group_id | The ID of the ElastiCache replication group (Redis/Valkey). |
| replication_group_arn | The ARN of the ElastiCache replication group. |
| replication_group_member_cluster_id | The ID of the first member cache cluster in the replication group. |
| primary_endpoint_address | The address of the primary endpoint (non-cluster mode). |
| reader_endpoint_address | The address of the reader endpoint (non-cluster mode). |
| configuration_endpoint_address | The address of the configuration endpoint (cluster mode). |
Expand Down
4 changes: 2 additions & 2 deletions cache/elasticache/elasticache.tf
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Expand Up @@ -10,7 +10,7 @@ resource "aws_elasticache_replication_group" "this" {

# Engine
engine = var.engine
engine_version = var.engine_version
engine_version = local.engine_version
parameter_group_name = aws_elasticache_parameter_group.this[0].name

# Node configuration
Expand Down Expand Up @@ -101,7 +101,7 @@ resource "aws_elasticache_cluster" "this" {

# Engine
engine = var.engine
engine_version = var.engine_version
engine_version = local.engine_version
parameter_group_name = aws_elasticache_parameter_group.this[0].name

# Node configuration
Expand Down
11 changes: 7 additions & 4 deletions cache/elasticache/locals.tf
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Expand Up @@ -22,6 +22,9 @@ locals {
# Redis and Valkey share the same resource types
is_redis_compatible = local.is_redis || local.is_valkey

# Engine version
engine_version = var.engine_minor_version != null && var.engine_minor_version != "" ? "${var.engine_major_version}.${var.engine_minor_version}" : var.engine_major_version

# Resource creation flags
is_serverless = var.serverless_enabled && local.is_redis_compatible
create_replication_group = local.is_redis_compatible && !local.is_serverless
Expand All @@ -39,11 +42,11 @@ locals {
# Parameter group family detection
# If not provided, derive from engine and version
default_parameter_group_family = local.is_redis ? (
var.engine_version != null ? "redis${split(".", var.engine_version)[0]}" : "redis7"
"redis${var.engine_major_version}"
) : local.is_valkey ? (
var.engine_version != null ? "valkey${split(".", var.engine_version)[0]}" : "valkey8"
"valkey${var.engine_major_version}"
) : (
var.engine_version != null ? "memcached${replace(var.engine_version, "/\\.[0-9]+$/", "")}" : "memcached1.6"
"memcached${var.engine_major_version}"
)
parameter_group_family = coalesce(var.parameter_group_family, local.default_parameter_group_family)

Expand All @@ -69,7 +72,7 @@ locals {
create_cloudwatch_alarms = var.cloudwatch_alarms_creation_enabled && !local.is_serverless

# Resource identifier for CloudWatch (used in dimensions)
cloudwatch_dimension_value = local.create_replication_group ? aws_elasticache_replication_group.this[0].id : (
cloudwatch_dimension_value = local.create_replication_group ? tolist(aws_elasticache_replication_group.this[0].member_clusters)[0] : (
local.create_cluster ? aws_elasticache_cluster.this[0].cluster_id : null
)

Expand Down
7 changes: 6 additions & 1 deletion cache/elasticache/outputs.tf
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Expand Up @@ -12,6 +12,11 @@ output "replication_group_arn" {
value = local.create_replication_group ? aws_elasticache_replication_group.this[0].arn : null
}

output "replication_group_member_cluster_id" {
description = "The ID of the first member cache cluster in the replication group."
value = local.create_replication_group ? tolist(aws_elasticache_replication_group.this[0].member_clusters)[0] : null
}

output "primary_endpoint_address" {
description = "The address of the primary endpoint for the replication group (non-cluster mode)."
value = local.create_replication_group && !local.cluster_mode_enabled ? aws_elasticache_replication_group.this[0].primary_endpoint_address : null
Expand Down Expand Up @@ -92,7 +97,7 @@ output "engine" {
output "engine_version" {
description = "The version of the cache engine."
value = local.create_replication_group ? aws_elasticache_replication_group.this[0].engine_version_actual : (
local.create_cluster ? aws_elasticache_cluster.this[0].engine_version_actual : var.engine_version
local.create_cluster ? aws_elasticache_cluster.this[0].engine_version_actual : local.engine_version
)
}

Expand Down
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