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* Adding check-legacy-links-format workflow * Adding test-link-rewrites workflow * Migrating links to new format * Updating docs-content-check-legacy-links-format hash * chore: update source * Update generated partials from Packer plugin SDK * Bump packer-plugin-sdk to get latest packer-sdc * Update website/content/docs/templates/hcl_templates/blocks/build/provisioner.mdx * Update Plugin SDK to fix shell-local regression --------- Co-authored-by: Kendall Strautman <kendallstrautman@gmail.com> Co-authored-by: Wilken Rivera <wilken@hashicorp.com> Co-authored-by: Kendall Strautman <36613477+kendallstrautman@users.noreply.github.com>
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---
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description: |
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Packer plugins let you add Packer functionality without modifying
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the core source code. Packer plugins are able to add new builders,
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provisioners, hooks, and more.
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page_title: Plugins
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---
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# Packer Plugins
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Packer plugins are separate, standalone applications that perform tasks during each build.
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During a `packer build`, the process list shows `packer-` prefixed applications. One of those applications is the Packer binary, and the rest are plugins. Packer launches one plugin process for each component in the build.
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The Packer binary has a set of built-in plugins that it can find and run automatically. You can also define a list of external plugins in your template for Packer to run and communicate with throughout the build. These external plugins extend Packer functionality without modifying the core source code.
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Refer to the following plugin documentation:
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- **Built-in Plugins:** Use [builders](/packer/docs/builders) to create machines and images, [data sources](/packer/docs/datasources) to fetch data, [provisioners](/packer/docs/provisioners) to install and configure machine images, and [post-processors](/packer/docs/post-processors) to perform additional tasks after provisioning
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- **External Plugins:** Review the documentation for [available external plugins](/packer/plugins) not included with the Packer binary
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- **Installing Plugins:** [Installation Guides](/packer/docs/plugins/install-plugins) to add external plugins to your Packer template and install the binaries
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- **Developing Plugins:** Get started [creating custom external plugins](/packer/docs/plugins/creation) |