[Enhancement]: Add support for ElastiCache Serverless

[MichaelMandel26]

Description

As announced by AWS, there is now a serverless option of ElastiCache. This issue is to request adding support for it.

Affected Resource(s) and/or Data Source(s)

• aws_elasticache_replication_group
• elasticache_cluster

Potential Terraform Configuration

No response

References

• Announcement
• API Reference

Would you like to implement a fix?

No

[github-actions]

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[haraldmeister]

On the purpose, it would be nice to implement a new resource as proposed in the followings:

Requested Resource(s) and/or Data Source(s)

• aws_elasticache_serverless (NEW)

Potential Terraform Configuration

resource "aws_vpc" "example" {
  cidr_block = "10.0.0.0/16"
}

resource "aws_subnet" "example" {
  vpc_id     = aws_vpc.example.id
  cidr_block = "10.0.1.0/24"

  tags = {
    Name = "my-subnet"
  }
}

resource "aws_elasticache_subnet_group" "example" {
  name       = "my-cache-subnet"
  subnet_ids = [aws_subnet.example.id]

resource "aws_elasticache_user" "default" {
  user_id       = "defaultUserID"
  user_name     = "default"
  access_string = "on ~app::* -@all +@read +@hash +@bitmap +@geo -setbit -bitfield -hset -hsetnx -hmset -hincrby -hincrbyfloat -hdel -bitop -geoadd -georadius -georadiusbymember"
  engine        = "REDIS"
  passwords     = ["password123456789"]
}

resource "aws_elasticache_user_group" "example" {
  engine        = "REDIS"
  user_group_id = "userGroupId"
  user_ids      = [aws_elasticache_user.default.user_id]

  lifecycle {
    ignore_changes = [user_ids]
  }
}


## Redis cluster

resource "aws_elasticache_serverless" "example" {
  cluster_id           = "cluster-example" #mandatory
  engine               = "redis" #mandatory | or "memcached"
  description          = "Description"
  security_group_ids   = ["sg-0exxxxxyyyyzzz"]
  encryption           = "aws/elasticache" # or KMS ARN
  user_group           = aws_elasticache_user_group.example.user_group_id
  subnet_group_name    = aws_elasticache_subnet_group.example.name
  automatic_backup     = false
  usage_limits = {
     memory  =  100 #GB
     compute =  10000 #ECPUs
  }
  tags = {
    Name = "my-serverless-cache"
  }
}

[meetreks]

I have looked at the changes needed and picked it up. Will update in this forum.

[meetreks]

Done with the resource creation, writing some acpt tests. Will aim for this weeks release for sure.

[meetreks]

I ran some tests and can see the config working on the console....last bits and pieces to tidy up. Getting some panic errors which I hope will be fixed tody

[meetreks]

Most tests work now, just some minor tidy ups and some documentation to go. Nearly there...

[meetreks]

ACCP tests are all fine. Ran a few more today and all are working as intended. Getting ready for the PR now!

[meetreks]

Please track this PR for more details -- #34951
I will watch the pipeline and see if anything comes out of the woodwork

[github-actions]

This functionality has been released in v5.32.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[Menahem1]

Hello,
How to get the endpoint (attribute reference) with only the address on string format ?
https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/elasticache_serverless_cache

[TonyLovesDevOps]

Hello, How to get the endpoint (attribute reference) with only the address on string format ? https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/elasticache_serverless_cache

It seems that the endpoint attribute is exposed as a list of maps w/ address & port keys. This seemed to work for me:

resource "aws_elasticache_serverless_cache" "example" {
  engine = "memcached"
  name   = "example"
}

output "example_endpoint_address" {
  value = aws_elasticache_serverless_cache.example.endpoint.0.address
}

I'm not sure if this data structure could look different with different configurations (e.g. multiple maps with different address and port values in the list), so caveat emptor.

[github-actions]

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