Is Terraform suitable for updating an AMI image?

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Vitaly Karasik2021-08-30 18:45:23

Amazon Web Services

Vitaly Karasik, 2021-08-30 18:45:23

AWS has autoscaling groups / launch templates / target groups / ALBs.

From time to time, you need to update the AMIs used in launch templates - raise EC2 from the current AMI, run the script, create an updated AMI. Is Terraform suitable for this? I don't think so, but maybe I'm missing something?

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2 answer(s)

V

Vadim, 2021-08-30
@vitaly_il1

Kind, Terraform is not very good, it's like an end user. Use packer to upgrade - best inside CI/CD pipeline. After updating ami, update the launch template in terraform by simply pointing to the (new) version of ami for ec2 machines.
But... in terraform, you can specify user_data with a bash script to run during instance initiation
https://www.bogotobogo.com/DevOps/Terraform/Terraf...

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Stanislav Bodrov, 2021-08-31
@jenki

From time to time you need to update AMIs used in launch templates

A clear hint at an immutable (immutable) infrastructure. Best practice suggests that a freshly baked image should be cleaned of unnecessary and everything necessary should be installed. Then everything is tested and verified.

Is Terraform suitable for this?

To deploy/upgrade with new AMI? Yes.
To create a new image with the required settings? In principle, you can wind up user data, but everything will not be the same style sooner. Ansible is more suitable for these purposes.