Terraform Example: ebs_block_device that remains after instance termination

main.tf.js

resource "aws_instance" "web" {
  ami = "ami-7f89a64f"
  instance_type = "t1.micro"
  ebs_block_device {
    device_name = "/dev/sdg"
    volume_size = 5
    volume_type = "gp2"
    delete_on_termination = false
  }
}

use_awscli_to_find_vol_id.sh

# Get EC2 Instance ID from Terraform Output
INSTANCE_ID=$(terraform show | grep -A 1 aws_instance.web | tail -n 1 | awk '{print $3}')

# Get the /dev/sdg volume details from AWS CLI
aws ec2 describe-volumes --filters Name=attachment.instance-id,Values=$INSTANCE_ID --filters Name=attachment.device,Values=/dev/sdg

# Use jq to scope those details down to just Volume ID
aws ec2 describe-volumes --filters Name=attachment.instance-id,Values=$INSTANCE_ID --filters Name=attachment.device,Values=/dev/sdg | jq -r '.Volumes[].VolumeId'

This is old, but I came across this and thought I'd help anyone who comes across it in the future.

@mikeab2685 One way to create device mappings using terraform is with a user_data script. This is a script that runs once after the server instance is created, so it's a good opportunity to mount drives and fix permissions errors.

https://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/ec2-windows-user-data.html