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dhi: add auto build info for customization (#23651)

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## Description

Added when customized images are rebuilt based on
https://www.docker.com/blog/the-next-evolution-of-docker-hardened-images

Updated topics:
-
https://deploy-preview-23651--docsdocker.netlify.app/dhi/how-to/customize/
-
https://deploy-preview-23651--docsdocker.netlify.app/dhi/features/patching/#automatic-patching-for-customized-images

## Related issues or tickets

[ENGDOCS-3098](https://docker.atlassian.net/browse/ENGDOCS-3098)

https://docker.slack.com/archives/C04M34MRQS1/p1762150009971479?thread_ts=1762149292.279889&cid=C04M34MRQS1

## Reviews

<!-- Notes for reviewers here -->
<!-- List applicable reviews (optionally @tag reviewers) -->

- [ ] Editorial review
- [ ] Product review

[ENGDOCS-3098]:
https://docker.atlassian.net/browse/ENGDOCS-3098?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

Signed-off-by: Craig Osterhout <craig.osterhout@docker.com>
This commit is contained in:
Craig Osterhout
2025-11-05 09:19:56 -08:00
committed by GitHub
parent 1762a2f823
commit 2f6af4a6c2
2 changed files with 24 additions and 5 deletions
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13
content/manuals/dhi/features/patching.md
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@@ -39,4 +39,15 @@ Docker Hardened Images are automatically rebuilt and tested.
Updated images are published with cryptographic provenance attestations to
support verification and compliance workflows. This automated process reduces
the operational burden of manual patching and helps teams stay aligned with
secure software development practices.
secure software development practices.
## Automatic patching for customized images
When you [customize a Docker Hardened Image](../how-to/customize.md), your
customized images also benefit from automatic patching. When the base Docker
Hardened Image receives a security update, Docker automatically rebuilds your
customized images in the background, ensuring they stay current with the latest
security patches without requiring manual intervention.
This means your customizations maintain continuous compliance and protection by
default, with no additional operational overhead.

16
content/manuals/dhi/how-to/customize.md
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@@ -8,16 +8,24 @@ description: Learn how to customize a Docker Hardened Images (DHI).
You can customize a Docker Hardened Image (DHI) to suit your specific needs
using the Docker Hub UI. This allows you to select a base image, add packages,
add artifacts, and configure settings. In addition, the build pipeline ensures that
your customized image is built securely and includes attestations.
add OCI artifacts (such as custom certificates or additional tools), and
configure settings. In addition, the build pipeline ensures that your customized
image is built securely and includes attestations.
Your customized images stay secure automatically. When the base Docker Hardened
Image receives a security patch or your OCI artifacts are updated, Docker
automatically rebuilds your customized images in the background. This ensures
continuous compliance and protection by default, with no manual work required.
The rebuilt images are signed and attested to the same SLSA Build Level 3
standard as the base images, ensuring a secure and verifiable supply chain.
## Customize a Docker Hardened Image
To add a customized Docker Hardened Image to your organization, an organization
owner must first [mirror](./mirror.md) the DHI repository to your organization.
Once the repository is mirrored, any user with access to the mirrored DHI
repository can create a customized image.
## Customize a Docker Hardened Image
To customize a Docker Hardened Image, follow these steps:
1. Sign in to [Docker Hub](https://hub.docker.com).