How to create a Terraform with if, else, elsif statement?

terraform terraform-provider-aws
ConscriptMR picture ConscriptMR · Apr 7, 2019 · Viewed 36.3k times · Source

I'm setting up a terraform module to create an aurora cluster.
I need to have an option for cross region replication so i need to decide the region of the replica in relation to the source region.
Is there any way to do a multiple option conditional in terraform?

Answer

victor m picture victor m · Apr 7, 2019

This is one way using the coalesce() function:

locals{
  prod = "${var.environment == "PROD" ? "east" : ""}"
  prod2 = "${var.environment == "PROD2" ? "west2" : ""}"
  nonprod = "${var.environment != "PROD" && var.environment != "PROD2" ? "west" : ""}"
  region = "${coalesce(local.prod,local.prod2, local.nonprod)}"
}

Related questions

How do I create an SSH key in Terraform?

I need to spin up a bunch of EC2 boxes for different users. Each user should be sandboxed from all the others, so each EC2 box needs its own SSH key. What's the best way to accomplish this in Terraform? …

Read More
Terraform aws: Error No configuration files found

I am new to Terraform. I am writing a small script to put a small datafile from my machine to aws S3 bucket.. but I am getting below error. Terraform file code:- provider "aws" { region = "us-east-1" version = "~> 1.6" } terraform { …

Read More
Conditional attributes in Terraform

Does Terraform support conditional attributes? I only want to use an attribute depending on a variable's value. Example: resource "aws_ebs_volume" "my_volume" { availability_zone = "xyz" size = 30 if ${var.staging_mode} == true: snapshot_id = "a_specific_snapshot_id" endif } …

Read More