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How to use condition with lists in Terraform 11

By : Wess
Date : August 02 2020, 05:00 AM
help you fix your problem You could do this with Local Values:
code :
variable "local_list" {
  default = ["foo"]

variable "remote_list" {
  default = ["bar"]

locals {
  myvar = length(var.local_list) > 0 ? var.local_list : var.remote_list

# myvar value is "foo"
output "myvar" {
  value = local.myvar

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Iterating through a map of lists in terraform?

By : Mark M.
Date : March 29 2020, 07:55 AM
help you fix your problem Seems this was not (easily) feasable prior to terraform 0.12 release.
The 0.12 release includes For expressions amongst many other improvemnets
code :
{for s in var.list : s => upper(s)}
 "a" = "A" 
 "b" = "B" 
 "c" = "C"
{for l in var.map : for s in var.list : s => upper(s)}
     "a" = "A" 
     "b" = "B" 
     "c" = "C"

terraform apply reporting backend configuration error with S3 after terraform init & terraform plan worked successfu

By : Kamal Soni
Date : March 29 2020, 07:55 AM
hop of those help? Seems that you have added new s3 as backend. So terraform requires re-initialization. Just run terraform init, it will add s3 as backend and ask permission to transfer local statefile to s3.

Terraform lists in version 0.12+

By : user2905247
Date : March 29 2020, 07:55 AM
seems to work fine Although you do not show a typical value for var.securityGroupIds and var.subnetIds, I will assume they are both lists. In Terraform < 0.12, you were required sometimes to put redundant array notation for parameter arguments and did not have first class support for variables. In Terraform >= 0.12, you should no longer put redundant array notation and you do have first class support for variables. You can update your code to handle both via:
code :
resource "aws_lb" "main" {
  name            = "myload-balancer"
  subnets         = var.subnetIds
  security_groups = var.securityGroupIds

How to use if else-if else condition in Terraform

By : Margit Schefte
Date : March 29 2020, 07:55 AM
I wish this help you I am trying to change the stack name based on the environment. I tried the following: , You've got the syntax for the ternary slightly wrong there:
code :
stack_name = intl-${var.intl_region}-${var.intl_ctry}-${var.intl_env}-jk-${var.vanity_env == "-np" || var.vanity_env == "-dr" ? "mstr" : "master"}
variable "intl_region" {
  default = "foo"

variable "intl_ctry" {
  default = "bar"

variable "intl_env" {
  default = "baz"

variable "vanity_env" {}

output "foo" {
  value = "intl-${var.intl_region}-${var.intl_ctry}-${var.intl_env}-jk-${var.vanity_env == "-np" || var.vanity_env == "-dr" ? "mstr" : "master"}"
$ TF_VAR_vanity_env=-np terraform apply

Apply complete! Resources: 0 added, 0 changed, 0 destroyed.


foo = intl-foo-bar-baz-jk-mstr
$ TF_VAR_vanity_env=-dr terraform apply

Apply complete! Resources: 0 added, 0 changed, 0 destroyed.


foo = intl-foo-bar-baz-jk-mstr
$ TF_VAR_vanity_env=quux terraform apply

Apply complete! Resources: 0 added, 0 changed, 0 destroyed.


foo = intl-foo-bar-baz-jk-master

Concatenate two lists in Terraform 0.12 - concat()

By : Bharath
Date : March 29 2020, 07:55 AM
With these it helps Terraform 0.12 makes a stronger distinction between list and set values than 0.11 did, and includes some additional checks like this.
In this particular case, concat is failing in this way because concatenation requires all of the elements to have a well-defined order so that the result can also have a well-defined order. Sets are not ordered, so this check is in place to remind you to explicitly select a suitable ordering when converting to list, or to not convert to list at all.
code :
  subnet_ids = concat(
  subnet_ids = setunion(
resource "aws_instance" "per_subnet_example" {
  # resource-level for_each is not implemented at the time of writing,
  # but planned for a future release.
  for_each = setunion(

  # ...
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