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Terraform - dynamic blocks

Dynamic Blocks   are more or less another way to implement   for  a  loop. Here are a few facts    dynamic block   which you should keep in ...

Dynamic Blocks are more or less another way to implement for a loop. Here are a few facts  dynamic block which you should keep in mind -

  1. Collections - You need to have collections .e.g. - list, map, set
  2. Iterator - To create a dynamic block you need to define an iterator.
  3. Content - Content is something onto which you wanna iterate.

Here is the syntax of dynamic block -

Before we implement our first terraform dynamic block let's first see an example without dynamic block.

In this example, we are going to create two ingress rules for the aws_security_group. Both ingress rules are exactly the same apart from the port numbers .i.e. - 80 and 443. So if we do not use dynamic block then we need to create two ingress rules blocks inside the terraform file.

provider "aws" {
  region ="us-east-1"
}
//security
resource "aws_security_group" "sg1" {

 ingress {
      description = "ingress_rule_1"
      from_port   = 443
      to_port     = 443
      protocol    = "tcp"
      cidr_blocks = ["0.0.0.0/0"]
   }
   
   ingress {
      description = "ingress_rule_2"
      from_port   = 80
      to_port     = 80
      protocol    = "tcp"
      cidr_blocks = ["0.0.0.0/0"]
   }
   tags = {
     "Name" = "Static Inbound Rule"
   }
}



The same terraform file can be improved by using dynamic block, now look at the following terraform file -
provider "aws" {
  region ="us-east-1"
}
//locals
locals {
   ingress_rules = [{
      port        = 443
      description = "Ingress rules for port 443"
   },
   {
      port        = 80
      description = "Ingree rules for port 80"
   }]
}
//security
resource "aws_security_group" "sg1" {
dynamic "ingress" {
      for_each = local.ingress_rules

      content {
         description = ingress.value.description
         from_port   = ingress.value.port
         to_port     = ingress.value.port
         protocol    = "tcp"
         cidr_blocks = ["0.0.0.0/0"]
      }
   }
   tags = {
     "Name" = "Dynamic Inbound Rule"
   }
}


Now you can imagine, if you need to define more than 2 ingress rules then using dynamic block can help you to reduce the line of code inside your terraform file.

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DevOpsWorld: Terraform - dynamic blocks
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