IaC, DevOps, Manage EC2 AMI, Launch Template and ASG with Packer and AWS CLI

  1. run EC2 instance with AMI image
  2. mutate the state (run commands) of instance created from step 1
  3. create new AMI image with instance from step 2
  4. modify launch template
  • when instances working with ASG
  • get AMI image running in ASG’s Launch Template for the base image
  • fix the launch template version configured in ASG with current version if it is default or latest to prevent from not intended scaling actions before we actually want to replace.
  1. scale out instances by doubling Desired capacity and also Maximum capacity if needed.
  2. set scale in protection on instances with new launch template to prevent from not being terminated by any termination policies.
  3. scale in instances by modifying back Desired capacity and Maximum capacity.
  4. remove scale in protection on new instances.

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