Open Image Cloud publishes ready-to-use, cosign-signed, reproducible cloud images for OpenStack and Proxmox.

• 🌐 Website — https://openimages.cloud
• 📦 Image registry — https://images.openimages.cloud (CDN-backed mirror of our self-hosted Garage source-of-truth)
• 📜 Conventions & contribution guide — CONVENTIONS.md

• 🔁 Reproducible builds on GitHub Actions with pinned upstream sources and a tagged builder container; commit, run URL, and builder digest are embedded in every image's MANIFEST.json.
• 🔒 Keyless cosign signatures via GitHub OIDC — verify any image without managing keys on your side.
• ☁️ Native cloud-init for OpenStack (ConfigDrive), Proxmox (NoCloud), and any provider that consumes either.
• 📦 Versioned & immutable paths on the public registry: images.openimages.cloud/<os>/<version>/<filename>. A mutable latest/ alias is kept fresh after each release.

¹ Amazon Linux 2 reached upstream EOL on 2025-06-30. Builds are kept available for extended-support customers; new deployments should target Amazon Linux 2023.

Octavia images are pinned to the matching OpenStack release; older paths stay immutable on the registry so you can keep targeting the OpenStack release of your existing deployment.

Need an OS that's not on this list? Open an issue — adoption is driven by demand.

All images are signed via cosign keyless (GitHub OIDC). Verify before booting:

# 1. Download the image and its cosign bundle
curl -fLO https://images.openimages.cloud/alpine-linux/3.23.4/alpine-3.23.4-uefi-x86_64.qcow2
curl -fLO https://images.openimages.cloud/alpine-linux/3.23.4/alpine-3.23.4-uefi-x86_64.qcow2.bundle

# 2. Verify the signature
cosign verify-blob alpine-3.23.4-uefi-x86_64.qcow2 \
  --bundle alpine-3.23.4-uefi-x86_64.qcow2.bundle --new-bundle-format \
  --certificate-identity-regexp 'https://github.com/open-img-cloud/' \
  --certificate-oidc-issuer https://token.actions.githubusercontent.com

Verified OK means the image was built by a GitHub Actions workflow under the open-img-cloud org. Inspect provenance via MANIFEST.json next to the image.

The build pipeline lives in open-img-cloud/.github as a set of reusable GitHub workflows plus composite actions. Each image repo stays thin: VERSION, a customize.sh (libguestfs) or dib-build.sh (diskimage-builder) hook, a detect-upstream.sh watcher, plus two thin caller workflows. See CONVENTIONS.md for the full contract.

Storage topology: Garage (self-hosted S3, source-of-truth) → mirrored to Cloudflare R2 → served behind the Cloudflare CDN at https://images.openimages.cloud. Routing is handled by images-router, a tiny Cloudflare Worker that maps /<os>/* to per-distribution buckets.

The infrastructure, workflows, and tooling published in this org are released under permissive open-source licenses (Apache-2.0 / MIT depending on the repo — see each repository's LICENSE file).

⚠️ The OS images themselves inherit the licensing terms of their upstream distributions (Alpine, Amazon Linux, NixOS, Oracle Linux, etc.). Review the original licenses before using any image in production.

PRs and issues are welcome — whether to add a new distribution, propose an architecture (arm64, riscv64), report a security issue, or improve the build pipeline. Start with CONVENTIONS.md if you want to add a new image repo.

Build once. Verify everywhere. Deploy anywhere.