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keel: default policy → never (post-incident safe default)

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2026-05-16 incident: Keel's `force` policy switched semver-pinned
images (affine 0.26.6 → :nightly-latest, calico v3.26.1 → :master)
instead of digest-tracking. Force is documented as "always update
to the newest tag in the registry" — only safe on already-mutable
tags like :latest.

Changing the cluster-wide default in inject-keel-annotations to
`never`. The namespace enrollment label + V2 lifecycle suppression
stay in place so opt-in is one annotation per Deployment, but no
service auto-updates until explicitly approved.

To opt in a workload now:
  1. Verify the Deployment image is on a mutable tag (:latest,
     :<major>, or a vendor "stable" tag) — change in Terraform first
     if needed.
  2. Add to the Deployment's metadata.annotations:
       "keel.sh/policy" = "force"   (digest tracking)
       OR
       "keel.sh/policy" = "patch"   (semver patch bumps — also
       requires ignore_changes on the image)

Live policy already updated via kubectl apply + per-workload
override (force → never).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
Viktor Barzin 2026-05-16 13:13:16 +00:00
parent 9765f6b9a4
commit 0a6b2489f7
1 changed files with 24 additions and 1 deletions
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25
stacks/kyverno/modules/kyverno/keel-annotations.tf
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@ -68,7 +68,30 @@ resource "kubernetes_manifest" "policy_inject_keel_annotations" {
metadata = {
annotations = {
# `+(...)` only adds if not present; per-workload overrides win.
"+(keel.sh/policy)" = "force"
#
# DEFAULT IS `never` — Keel ignores the workload.
#
# Rationale (post 2026-05-16 incident): Keel's `force` policy
# is documented as "always update to the newest tag in the
# registry," not "watch current tag for digest changes." On
# services pinned to semver (e.g. calico/node:v3.26.1,
# affine:0.26.6), force triggers a tag REWRITE — Keel switched
# affine → :nightly-latest and calico → :master. Calico was
# auto-healed by tigera-operator; affine had to be rolled back.
#
# Safe enablement now requires per-WORKLOAD opt-in:
# (a) ensure the Deployment's image is on a MUTABLE tag —
# `:latest` (force works), `:<major>` like `:16`/`:7`,
# or a vendor "stable" tag.
# (b) override THIS default by setting the Deployment's
# metadata.annotations["keel.sh/policy"] to `force`
# (digest tracking on the mutable tag) or `patch`/`minor`
# (semver bumps, requires `ignore_changes` on image).
#
# The namespace enrollment label + V2 lifecycle remain in
# place so opt-in is a one-line annotation per Deployment,
# without touching the namespace or refactoring lifecycle.
"+(keel.sh/policy)" = "never"
"+(keel.sh/trigger)" = "poll"
"+(keel.sh/pollSchedule)" = "@every 1h"
}