AWS ElastiCache doesn't support Redis 6.0 usages

[vnatarov-logz]

Hi there,

I want to use AWS ElastiCache with Redis instance and trying use 6.0 or 6.0.x or 6.0.5, but without any luck:

terraform {
  required_version = "~> 1.0"

  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = "4.5.0"
    }
  }

    backend "s3" {
      bucket = "terraform-state-bucket-us-east-1-staging"
      key    = "aws/us-east-1/staging/elasticache/terraform.tfstate"
      region = "us-east-1"

      dynamodb_table = "dynamodb_state_lock_table_us_east_1_staging"
    }
}

provider "aws" {
  region = "us-east-1"
}

locals {
    environment = "dev"
    stack_name = "elasticache-redis-staging"
}

# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# SG of elasticache for single Redis node
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
module "sg_elasticache_single_redis" {
  source = "git@github.com:SebastianUA/terraform.git//aws/modules/sg?ref=dev"

  enable_security_group = true
  security_group_name   = "${local.environment}-sg-${local.stack_name}"
  security_group_vpc_id = "vpc-0df458ebc8f78adf8"


  security_group_ingress = [
    {
      from_port = 6379
      to_port   = 6379
      protocol  = "all"

      cidr_blocks = ["0.0.0.0/0"]
      description = "6379 from VPC"
    }
  ]

  security_group_egress = [
    {
      from_port = 6379
      to_port   = 6379
      protocol  = "all"

      cidr_blocks = ["0.0.0.0/0"]
      description = "6379 to VPC"
    }
  ]

  tags = tomap({
    "Environment"   = "dev",
    "Createdby"     = "Vitaliy Natarov",
    "Orchestration" = "Terraform"
  })
}

# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/supported-engine-versions.html#redis-version-6.0
# https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/supported-engine-versions.html#redis-version-6.2
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
module "elasticache_single_redis" {
  source = "git@github.com:SebastianUA/terraform.git//aws/modules/elasticache?ref=dev"

  # The single cluster
  enable_elasticache_cluster          = true
  elasticache_cluster_num_cache_nodes = 1
  elasticache_cluster_node_type       = "cache.t4g.medium"
  elasticache_cluster_name            = "${local.environment}-${local.stack_name}-1"
  elasticache_cluster_engine          = "redis"
  elasticache_cluster_engine_version  = "6.x" #"5.0.6" # "6.0.5" - doesn't work
  elasticache_cluster_port            = "6379"

  # prefer to use subnet group
  # elasticache_cluster_subnet_group_name = "terracd-us-east-1-staging-vpc-subnet-private-us-east-1c"

  # (Optional, VPC only) One or more VPC security groups associated with the cache cluster
  elasticache_cluster_security_group_ids = [module.sg_elasticache_single_redis.security_group_id]

  # (Optional, EC2 Classic only) List of security group names to associate with this cache cluster. Changing this value will re-create the resource.
  # elasticache_cluster_security_group_names = [module.sg_elasticache_single_redis.security_group_name]

  # elasticache subnet group
  enable_elasticache_subnet_group     = true
  elasticache_subnet_group_name       = "${local.environment}-${local.stack_name}-subnet-group"
  elasticache_subnet_group_subnet_ids = ["subnet-0dee889c36614e335", "subnet-00c642659b07d3338"]

  # elasticache parameter group
  enable_elasticache_parameter_group = false
  elasticache_parameter_group_name   = "${local.environment}-${local.stack_name}-param-group"
  elasticache_parameter_group_parameter = [
    {
      name  = "activerehashing"
      value = "yes"
    }
  ]

  tags = tomap({
    "Environment"   = local.environment,
    "Createdby"     = "Vitaliy Natarov",
    "Orchestration" = "Terraform"
  })

  depends_on = [
    module.sg_elasticache_single_redis
  ]
}

It's working, only when set 6.x, but Terraform will bring the Redis 6.2 up.
Also, when you set 5.0.6 - it's working fine.

Could you please help me to resolve this issue:
engine_version: Redis versions must match <major>.x when using version 6 or higher, or <major>.<minor>.<bug-fix>

[bschaatsbergen]

I believe that the only 2 supported versions for ElastiCache Redis are 6.0 and 6.2. By briefly looking at https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/supported-engine-versions.html

Support for 6.x has been added through: #18920

[vnatarov-logz]

Hi @bschaatsbergen,

Thank you for your reply, but unfortunately - I could not use 6.0. It didn't work.
The working versions:

• 6.x
• 5.0.6

Manually, you can create 6.0 and then you will have 6.0.5.

[bschaatsbergen]

Done some digging, I understand what you mean.

It seems like this was raised through #22385

We can alter the regex pattern (redisVersionPostV6RegexpRaw) to: ([6-9]|[[:digit:]]{2})\.([[:digit:]]+|x)

That will allow you to specify 6.0, 6.2 and 6.x (to pull the latest minor version of Redis 6.)

@justinretzolk could you close this issue, I'll pick it up under #22385

[justinretzolk]

Hey @vnatarov-logz 👋 It looks like this is a duplicate of #22385. We like to try to keep discussion centralized to one location where possible, so we'll close this one in favor of #22385.

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