Packer Infrastructure Templates

Packer is an open-source tool that automates machine image creation. You define a template (HCL or JSON) specifying base OS, packages to install, configurations, and tests. Packer builds an image: boots a temporary instance, runs your provisioning scripts, tests, then captures the image for reuse. Output: AWS AMI (Amazon Machine Image), Azure VHD, GCP Image, Vagrant box. Share across team. Deploy 1000 servers from one image in seconds.