title: How to update AWS ECS cluster instances with Terraform?
body: <p>I have an existing ECS cluster (EC2) created using Terraform. I want to install some software on those EC2 instances using Terraform. One of our business requirements is that we will not be able to destroy and re-create the instances and we have to do it on existing instances.</p>
  
  <p>How should I approach this?</p>