kube-apiserver v1.36.6 build recipe

github.com/kubernetes/kubernetes (v1.36.6) at 1b2171b110bb2a2542e1322035c6583ec86eb976

Fetched once, with the network on, by the vendor step (Dockerfile.vendor) when the kit was made; the offline build uses the kit's vendored copies:

• git https://github.com/kubernetes/kubernetes.git v1.36.6

• Base imagegolang:1.26.10-bookworm@sha256:632dff7351799a5a9954a48dc06670ade72ee44e8c351cdc0e5a57af2fea21af
• Base imageubuntu:24.04@sha256:24737cef17f4e22b1977df7d9a05e77c4e28b7da5b8911f8d8ccda136bf3573c
• BuildKitmoby/buildkit:v0.31.2
  sha256:e0e67ea9c4bb07bdef683e29f70f3b623d1eb9c82274a9ec04e6bb0511449fb0
• Build methodsource-rebuild-go
• SOURCE_DATE_EPOCH1793102572 (2026-10-27T12:02:52Z)
• Target digest (linux/amd64)sha256:49c4d7708668d7ab42ae0d1d3d584063f67ef87f2d746e21d6709288afdb997e
• Target config digestsha256:bda04858b63b3674f29e30e469069bcc4e3817e258c5a12f7b9f985639d8fda1
• Checksummed kit files58,527 (CHECKSUMS.sha256)

# =====================================================================
# kube-apiserver v1.36.6 L-009 HERMETIC OFFLINE BUILD — the canonical, attestation-producing build. build_kit runs
#   docker buildx build --builder readystack-builder-max --network=none
#     --attest type=provenance,mode=max --attest type=sbom --push <context>
# Pinned-public-base + vendored model: golang 1.26.10 + ubuntu 24.04 pinned BY DIGEST (BASE_IMAGE_DIGESTS.lock);
# vendored/kubeapiserver-src is kubernetes v1.36.6 fully vendored (GOPROXY=off, the workspace vendor/), vendored/debs the
# apt closure (dpkg offline), vendored/setcap-debs libcap2-bin for the setcap stage only.
# Dockerfile and Dockerfile.offline are byte copies of this file (the repo-wide convention).
#
# SHAPE (upstream build/server-image/kube-apiserver/Dockerfile at v1.36.6): /usr/local/bin/kube-apiserver with
# cap_net_bind_service, /go-runner (kube-log-runner, built from the same tree) as ENTRYPOINT. kubeadm's static Pod
# sets `command: [kube-apiserver, ...]`, which replaces the ENTRYPOINT. Unlike upstream (distroless, root) the base is
# Ubuntu 24.04 and the default user is kube (999:999): root comes from the Pod (securityContext.runAsUser: 0, the kubeadm
# patch file product-kits/kubevirt-stack/install/controlplane/patches/kube-apiserver+strategic.yaml).
# =====================================================================

# --- kube-apiserver + kube-log-runner (/go-runner) ---------------------------------------------------------------------
FROM golang:1.26.10-bookworm@sha256:632dff7351799a5a9954a48dc06670ade72ee44e8c351cdc0e5a57af2fea21af AS build
ARG SOURCE_DATE_EPOCH=1793102572
WORKDIR /k8s
COPY vendored/kubeapiserver-src/ .
ENV CGO_ENABLED=0 GOTOOLCHAIN=local GOFLAGS=-buildvcs=false GOPROXY=off
# upstream hack/lib/golang.sh + version.sh: tags selinux,notest,grpcnotrace; -trimpath -s -w; static (CGO off);
# gitVersion/gitCommit/gitTreeState/gitMajor/gitMinor/buildDate stamped into both version packages, buildDate from

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#!/usr/bin/env bash
# =============================================================================
# ReadyStack — offline reproducible rebuild.
#
# Rebuilds this product's image from THIS ARCHIVE ALONE, with no network access
# of any kind, and prints the resulting linux/amd64 image-manifest digest.
# Run ./VERIFY_OFFLINE.sh afterwards to assert it equals the published digest.
#
# Requirements: linux/amd64 Docker host, docker buildx >= 0.30, jq, tar.
# No git, no registry access, no additional tooling.
#
#   ./BUILD_OFFLINE.sh                the rebuild (OCI image + a docker-loadable copy)
#   ./BUILD_OFFLINE.sh --provenance   the same rebuild with SLSA v1 build provenance (mode=max) attached to the OCI
#                                     image, generated by BuildKit, not by any build step. Run on your own hardened,
#                                     isolated build platform and sign that provenance with a key the build cannot
#                                     reach, and the result meets SLSA Build Level 3 (see REBUILD.md). The image
#                                     digest is the same either way.
# =============================================================================
set -euo pipefail
PROVENANCE=0
for arg in "$@"; do
  case "$arg" in
    --provenance) PROVENANCE=1 ;;
    -h|--help) sed -n '2,20p' "$0"; exit 0 ;;

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