kube-proxy v1.36.6 build recipe

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

Also built from source:

• github.com/kubernetes-sigs/iptables-wrappers (v2) at e139a115350974aac8a82ec4b815d2845f86997e

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
• https://raw.githubusercontent.com/kubernetes-sigs/iptables-wrappers/e139a115350974aac8a82ec4b815d2845f86997e/iptables-wrapper-installer.sh
• https://raw.githubusercontent.com/kubernetes-sigs/iptables-wrappers/e139a115350974aac8a82ec4b815d2845f86997e/LICENSE

• Base imagegolang:1.26.10-bookworm@sha256:632dff7351799a5a9954a48dc06670ade72ee44e8c351cdc0e5a57af2fea21af
• Base imageubuntu:24.04@sha256:fe81560990fae86dc4743202b2cb4d3df98d0bcf949173cecef15ce1127ef852
• BuildKitmoby/buildkit:v0.31.2
  sha256:e0e67ea9c4bb07bdef683e29f70f3b623d1eb9c82274a9ec04e6bb0511449fb0
• Build methodsource-rebuild-go
• SOURCE_DATE_EPOCH1793102572 (2026-10-27T12:02:52Z)
• Target digest (linux/amd64)sha256:690fd8d24cd4ffbf70dbe1ba26ac48ce80a972d7183cf691948ff5ff8ca8d56c
• Target config digestsha256:1bf0dce8746c88d2ef18a5ea6fd77c4d40442504347dd2a9cd6ccc2ce64349c1
• Checksummed kit files58,547 (CHECKSUMS.sha256)

# =====================================================================
# kube-proxy 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/kubeproxy-src is kubernetes v1.36.6 fully vendored (GOPROXY=off, the workspace vendor/), vendored/debs the
# apt closure (dpkg offline), vendored/iptables-wrappers the iptables-wrappers v2 installer (sha256-checked).
# Dockerfile and Dockerfile.offline are byte copies of this file (the repo-wide convention).
#
# SHAPE (upstream build/server-image/Dockerfile at v1.36.6 on its kube-proxy base, distroless-iptables v0.9.9):
# /usr/local/bin/kube-proxy, /go-runner (kube-log-runner, built from the same tree) as ENTRYPOINT, and the base's
# userland from Ubuntu 24.04 packages: iptables and ip6tables in legacy and nft modes behind iptables-wrappers' mode
# selection (the first call of iptables/ip6tables[-save|-restore] picks legacy or nft from the rules the node's kubelet
# already wrote, as upstream's base does), ipset, kmod, nft (with JSON), conntrack. kubeadm's DaemonSet sets
# `command: [/usr/local/bin/kube-proxy, ...]`, which replaces the ENTRYPOINT. Unlike upstream (root) the default user
# is kube (999:999): kube-proxy needs root and the host network; both come from the Pod (our DaemonSet,
# product-kits/kubevirt-stack/install/controlplane/kube-proxy.yaml: privileged, runAsUser: 0).
# =====================================================================

# --- kube-proxy + kube-log-runner (/go-runner) ------------------------------------------------------------------------
FROM golang:1.26.10-bookworm@sha256:632dff7351799a5a9954a48dc06670ade72ee44e8c351cdc0e5a57af2fea21af AS build
ARG SOURCE_DATE_EPOCH=1793102572
WORKDIR /k8s
COPY vendored/kubeproxy-src/ .

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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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