CODEWITHSUNDEEP
terraform
slipperypete
slipperypete

Reputation: 6276

How to create multiple resources in a for loop with terraform?

I have looked at several bits of documentation as well as a udemy course on terraform and I do not understand how to do the thing that I want to do. I want to create a for loop and in it I want to create an S3 event notification, create an Sns topic that listens to that notification, create an Sqs queue and then subscribe the queue to the sns topic. It seems like for loops in terraform are not advanced enough to do this. Am I wrong, is there any documentation or examples that explain how to use for loops for this use case?

Thanks in advance.

Upvotes: 27

Views: 53604

Answers (2)

l33tHax0r
l33tHax0r

Reputation: 1721

The for_each example looks like the following:


variable names {
  type = list(string)
  description = "List of names"
}

resource "aws_example_resource" "bar" {
  for_each = toset(var.names)
  name = each.key
}

This will create N resources (length of names), using the each.key to specify the value to assign to name each time

Upvotes: 16

mon
mon

Reputation: 22366

An example to create AWS VPC subnets then give them to AWS EC2 instances.

resource "aws_subnet" "public" {
  count = length(var.public_subnet_cidr_blocks)
  vpc_id     = var.vpc_id
  cidr_block = var.public_subnet_cidr_blocks[count.index]
}

resource "aws_instance" "public_ec2" {
  count = length(var.public_subnet_ids)
  subnet_id = var.public_subnet_ids[count.index]
  ami           = var.ami_id
  instance_type = "t2.micro"
  tags = {
    Name = "PublicEC2${count.index}}"
  }
  provisioner "local-exec" {
    command = <<EOF
echo "Public EC2 ${count.index} ID is ${self.id}"
EOF
  }
}

There is no syntax like below to create resources.

[ for name in var.names:
 aws_s3_bucket {...} 
 aws_sns_topic {...}
]

For expression is basically for values, not for creating resources.

  • for Expressions

    A for expression creates a complex type value by transforming another complex type value.

To create multiple resources, as below in the document use for_each or count.

Upvotes: 14

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