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HashiCorp Packer is an open-source tool that automates machine image creation for multiple platforms using a single source configuration. It ensures images are portable, reproducible, and version-controlled, improving efficiency and reliability in infrastructure management.

Packer uses templates written in JSON or HashiCorp Configuration Language (HCL) to define desired configurations and settings. Templates can be reused with variables, making them customizable. Builders create machine images for specific platforms, while provisioners configure machines during image-building. Post-processors modify artifacts after build completion.

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Source: https://dev.to/subham_nandi/hashicorp-packer-3h61