Chapter 2 - webserver cluster - Terraform warning

[martin-flower]

terraform plan displays the following in 02-intro-to-terraform-syntax/webserver-cluster

Warning: "condition.0.values": [DEPRECATED] use 'host_header' or 'path_pattern' attribute instead
  on main.tf line 113, in resource "aws_lb_listener_rule" "asg":
 113: resource "aws_lb_listener_rule" "asg" {

Terraform v0.12.10
+ provider.aws v2.43.0
macOS 10.15.2

How do I get rid of this message?

[brikis98]

This was a change introduced in hashicorp/terraform-provider-aws#8268, which was released in AWS Provider 2.42.0, which came out after the second edition of the book was published. There are two ways you can get rid of this warning:

1. Do as the warning suggests and switch from this format:

   condition {
     field  = "path-pattern"
     values = ["*"]
   }

   To this format:

   condition {
     path_pattern {
       values = ["*"]
     }
   }

2. Pin yourself to the older AWS provider version (this is not a good long-term fix):

   provider "aws" {
     version = "= 2.41.0"
   }

[martin-flower]

Thanks Yevgeniy! Very helpful to not only give the solution, but also the explanation. In order to have repeatable build we probably need to pin the terraform and aws-provider versions. Just need to make sure we upgrade regularly.