The documentation for AWS ElastiCache replication group is wrong/incomplete

[hashibot]

This issue was originally opened by @FransUrbo as hashicorp/terraform#10128. It was migrated here as part of the provider split. The original body of the issue is below.

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Trying to create a AWS ElastiCache replication group and then a Route53 entry for that gives me an error.

The documentation say:

configuration_endpoint_address - (Redis only) The address of the replication group configuration endpoint when cluster mode is enabled.

but this don't seem to be the case.

Terraform Version

0.7.8

Affected Resource(s)

• aws_elasticache_replication_group

Terraform Configuration Files

resource "aws_elasticache_replication_group" "autoscaling_event_update_route53" {
  replication_group_id          = "asgevnt-route53"
  replication_group_description = "Autoscaling events updating Route53"

  engine_version                = "3.2.4"
  node_type                     = "cache.m3.medium"
# => The number of replicas per node group must be within 0 and 5.
  number_cache_clusters         = "${length(data.aws_availability_zones.available.names)}"
  port                          = 6379

  subnet_group_name             = "${aws_elasticache_subnet_group.main.name}"
  security_group_ids            = [
    "${aws_security_group.main-all.id}"
  ]
  parameter_group_name          = "default.redis3.2"

  automatic_failover_enabled    = "true"
  availability_zones            = ["${data.aws_availability_zones.available.names}"]
  apply_immediately             = "true"
  maintenance_window            = "sun:01:00-sun:02:00"

  tags {
    Name                        = "autoscaling_event_update_route53"
    environment                 = "core"
    service                     = "main"
  }
}

resource "aws_route53_record" "elasticache" {
 zone_id               = "${aws_route53_zone.main.zone_id}"
 name                  = "elasticache.${var.dns_zone}"
 type                  = "A"
 ttl                   = "300"
 records               = ["${aws_elasticache_replication_group.autoscaling_event_update_route53.configuration_endpoint_address}"]
}

Gives * Resource 'aws_elasticache_replication_group.autoscaling_event_update_route53' does not have attribute 'configuration_endpoint_address' for variable 'aws_elasticache_replication_group.autoscaling_event_update_route53.configuration_endpoint_address'

Looking at the ElastiCache Dashboard, it instead uses Primary Endpoint with Configuration Endpoint: -.

[Ninir]

Hi @FransUrbo

Are you still having this issue in TF 0.10.2?

Thanks!

[FransUrbo]

Not sure, I solved it by using primary_endpoint_address instead in the aws_route53_record resource.

I've never tried going back to using configuration_endpoint_address (and now I'm live so I'm reluctant to try - using primary_endpoint_address works).

However, if I look at the state file, there is no configuration_endpoint_address value anywhere.

[Ninir]

As far as I checked, configuration_endpoint_address is set when Redis is not clusterized, whereas primary_endpoint_address is used for Redis in a cluster mode.
So for your use-case, you were right!

Closing since you seem to have resolve it :)

Checking the documentation separately!

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!