Packer is part of the HashiCorp open source suite of tools, and this is the official Packer page: https://www.packer.io/. It's an open source command-line tool that allows us to create custom VM images of any OS (these images are also called templates) on several platforms from a JSON file.
Packer's operation is simple; it is based on the basic OS provided by the different cloud providers and configures a temporary VM by executing the scripts described in the JSON template. Then, from this temporary VM, Packer generates a custom image ready to be used to provision VMs.
Apart from VM images, Packer also provides other types of images such as Docker images or Vagrant images. After this brief overview of Packer, let's look at the different installation modes.
