Terraform-provider-aws: [aws_lb_target_group] Validation forces invalid path for TCP health check

[whereisaaron]

It is desirable to be able to configure either a TCP or HTTP/HTTPS health check based on variables as in the below example. Currently the validation forces the health check path to begin with a slash("/"), even when the protocol is TCP, preventing this use case. When the protocol is TCP, blank ("") is the only valid path for the AWS API.

  health_check {
    healthy_threshold   = 2
    unhealthy_threshold = 2
    timeout             = 10
    port                = 8000
    path                = "${var.protocol == "TCP" ? "" : "/healthz"}"
    protocol            = "${var.protocol}"
    interval            = 30
    matcher             = "${var.protocol == "TCP" ? "" : "200-399"}"
  }

Terraform Version

Terraform v0.11.1
+ provider.aws v1.7.0

Affected Resource(s)

• aws_lb_target_group

Terraform Configuration Files

  health_check {
    healthy_threshold   = 2
    unhealthy_threshold = 2
    timeout             = 10
    port                = 8000
    path                = ""
    protocol            = "TCP"
    interval            = 30
    matcher             = ""
  }

Expected Behavior

Expected to be able to use a blank 'path' for a TCP health check.
Or else the path validation should be left to the AWS API.

Actual Behavior

Error: module.nlb.aws_lb_target_group.nlb[0]: "health_check.0.path" must begin with a '/' character: ""

Steps to Reproduce

1. Create a aws_lb_target_group with health_check.protocol="TCP" and health_check.path=""
2. terraform init
3. terraform apply

References

Validation was recently improved to enable HTTP/HTTPS health checks to be able to be specified for TCP Target Groups in PR #2906.

[whereisaaron]

Looks like there is a fairly trivial fix for this: PR #2980

Only check for "/" if the path is not blank.

[bflad]

This fix is in master and will be released in v1.7.1, which we are planning for later this week.

[bflad]

This has been released in terraform-provider-aws version 1.7.1. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

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