Custom AMI

An AMI is required to create an instance, however we can also create AMIs.
For that, we need to specify a base AMI, create the instance then save the instance configurations as a new custom AMI. So whenever we need the same configurations, we'll already have an AMI configured.
This is great because we can make changes only to the AMI and it will be replicated across all instances using the custom AMI

To create new AMI with IaC tools, we should use a packager like Packer, Ansible or Chef.
How to