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Question

Hi Team

I need to know what strategy we should use when we try to upgrade an agent on a running ec2. In order to follow cloud standards what i did is. i created an AMI and that has got my agent installed, so any new ec2 made by that AMI is having the agent installed. But when i want to upgrade the agent. how should i go about it?

Which is the best option here:

1. Code deploy
2. Code pipeline
3. Lambda.

or what else should be a good approach to follow?

Thanks

Answer

Hi!

You could either follow "golden AMI" approach - in this case you create a CI/CD pipeline (e.g CodeBuild/Jenkins/TeamCity/etc) that when your new agent version is build - it triggers rebuild of AMI - either via [HashiCorp Packer](https://www.packer.io/) or  [EC2 Image builder](https://aws.amazon.com/image-builder/) and you further update your nodes to that latest AMI - you could do that via [ASG & Launch Templates](https://docs.aws.amazon.com/autoscaling/ec2/userguide/launch-templates.html).

Another way  - if you want just have basic AMI that you've already created - and just update the agent on some basis - you better leverage SSM (AWS Systems Manager) features like [Distributor](https://docs.aws.amazon.com/systems-manager/latest/userguide/distributor.html) that allows to package and publish software on the managed nodes (you need SSM Agent pre-installed for that and ec2 Profile that allows SSM). Or you could just simply use 'Run command" in SSM and run any script that do the task of updating for you on any number of managed machines.

How to Design or Architect

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