Can I manage Existing AWS infrastructure with Terraform?

Terraform Providers AWS
1

Hi Team ,
I am new to terraform world, created some basic scripts of deployment ec2 in AWS. I would like to know how can I use terraform to manage existing aws resources which created by other means , like manual.
I have created ec2 instances with terraform, but elbs are pre-exists and I need to attach my ec2 instances under the elb , trying to do that with terraform, not sure how to do that. Could you please help me on this please?

Thanks
Suddhasil

2

@suddhasilsarkar , you can import your existing infrastructure and then manage it via Terraform. Take a look on:

3

Many thanks @pavel-snyk this helps. I could able to import eixsting elb. Now I was planning to add the ec2s I have created part of tf script, while running plan I see its showing as below. does it mean its going to detach the existing nodes?

image
image2500×884 121 KB

tf_plan_log
tf_plan_log2500×884 98 KB

Please let me know on this, and also if any questions, please.
Thanks for all help here

Thanks
Suddhasil

4

From the screenshot you attached, you can see that the LB will be re-attached (from 4 existing EC2 instance to other EC2 instance).
So I guess you should import these EC2 instances into Terraform as well. Ideally you don’t have any changes at all.

5

Yeah there is challenge, so the 4 existing instances I only created part of the script , but here it seems like its going to remove the existing one from elb , not sure why, I can not test this in prod ( given env). I will check this out in the test environment ,ideally it should call the existing instances only which means, no change in actual execution.