3

I have an aws_lambda_function resource like below:

resource "aws_lambda_function" "mylambda" {

    #...
    
    environment {
        variables = {
            FOO = 1
        }
    }

}

I'm tring to add some environment variables dynamically based on my var.enable_vars

variable "enable_vars" {
  type        = bool
  default     = false
}


resource "aws_lambda_function" "mylambda" {

    #...
    
    environment {
        variables = {
            FOO = 1
    #### if var.enable_vars == true
    #       BAR = 2
    #       BAZ = 3
        }
    }

}

How to achieve that? Is not clear to me if a dynamic block can be used there.

3
  • You could set the environment variables in the code itself from a file conditionally based on one variable set during the build time
    – jabbson
    Oct 19, 2022 at 16:26
  • @jabbson can you add more details?
    – sgargel
    Oct 19, 2022 at 18:57
  • you could have your environment variables stored in the .env files, uploaded along with the code and then loaded during execution. Also you could use ternary operator, if setting BAR = 0 or -1 could mean the same as not being set within your app logic.
    – jabbson
    Oct 19, 2022 at 21:11

1 Answer 1

3

This could be done with a dynamic block but its pretty complicated. This is how I would do it but there are other ways.

variable "enable_vars" {
  type        = bool
  default     = false
}

locals {
  default_lambda_vars = {
    FOO = 1
  }
  extra_vars = {
    BAR = 2
    BAZ = 3
  }

  final_lambda_vars = var.enable_vars ? merge(local.default_lambda_vars, local.extra_vars) : local.default_lambda_vars
}


resource "aws_lambda_function" "mylambda" {

    #...

    environment {
        variables = local.final_lambda_vars
    }

}

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