Docker Engine 27 rootless¶

Upstream Docker Engine 27.5.1 static payload on maintained Alpine, rootless daemon

Image: ghcr.io/strukturpiloten/docker-27-rootless
Declared image version: v27.5.1
Family: Docker Engine
Architecture: amd64, arm64
Inner mode: rootless

Declared runtime base: docker.io/library/alpine:3.24@sha256:294b683cb724975bec92580e1e685676bd4b50bda910ddb8c51d4cabeaec77e6

Image source and metadata · GHCR package · Detailed guide

Choose and inspect¶

Declared upstream software: 27.5.1

Declared tags: v27.5.1, v27.5, v27, main, latest. These are publication policy aliases, not proof that any tag exists in GHCR. Even the exact SemVer tag can move after a reviewed rebuild.

Registry status: observed; checked at 2026-09-28T10:15:41.300664+00:00.

Observed latest index digest: sha256:6971d4d38ee9903049cee9d1fe418a65d2f1ceea41a56e895ee52e13239542af.

Pull the observed immutable artifact:

podman pull ghcr.io/strukturpiloten/docker-27-rootless@sha256:6971d4d38ee9903049cee9d1fe418a65d2f1ceea41a56e895ee52e13239542af

For an isolated Linux nested-Docker test, the outer Podman boundary runs rootfully and privileged. Use a trusted runner and keep its image store separate from other tests:

sudo podman run --rm --detach --name nested-docker --privileged --device /dev/fuse --security-opt label=disable ghcr.io/strukturpiloten/docker-27-rootless@sha256:6971d4d38ee9903049cee9d1fe418a65d2f1ceea41a56e895ee52e13239542af
ready=0
for attempt in $(seq 1 30); do
  if sudo podman exec nested-docker docker info >/dev/null 2>&1; then ready=1; break; fi
  sleep 2
done
if [ "$ready" -eq 1 ]; then sudo podman exec nested-docker docker info; else sudo podman logs nested-docker; fi
sudo podman stop nested-docker
test "$ready" -eq 1

This fixture does not use the host Docker socket. Read the detailed guide for nested workloads.

Support and runtime contract¶

Lifecycle: legacy; admission: isolated-test; review after: 2026-10-27.

Pinned static Engine and bundled dependencies are not patched by Alpine OS rebuilds; isolated compatibility fixture only.

Declared runtime profiles: docker. Declared test settings are in the metadata source. Admission is policy, not evidence of a passed test.

Declared runtime test contract:

{
  "docker": {
    "mode": "rootless",
    "nestedRuntime": true,
    "outerPrivilege": "privileged"
  }
}

Registry aliases and history¶

Aliases resolved to the observed current digest: latest, main, v27, v27.5, v27.5.1.

Listed without digest resolution: run-36346260768-1-sha-0b136a13a8bb612d91960ae5d07e72f449c89ec1, sha-0b136a13a8bb612d91960ae5d07e72f449c89ec1, sha256-6910efb1df48c29c0d77bd2600bf517b54fa4ae8cb2b495747252f9af5642c3e, sha256-6971d4d38ee9903049cee9d1fe418a65d2f1ceea41a56e895ee52e13239542af, sha256-b70b1ebefdc9b6cef3e1d7d9dcf7290316d676d03991f0de88dfbb08781ef179.

Evidence and timestamps¶

Matching release asset verified the build record and per-architecture runtime and scan evidence. Signature and provenance remain unverified in this snapshot.

Maintenance release · Evidence asset

GitHub package activity can include signatures and attestations; it does not identify when the current runnable image was published. A registry observation is a point-in-time check; mutable tags may move afterward. Use the immutable digest and maintenance evidence for an audit.