jakman85andClaude Opus 5
d1a6628a97
OPERATOR DECISION 2026-09-06: "use the VIP as intended — a virtual address to reach
the cluster and provide fault tolerant HA. Without a change it will not work in HA."
THE DEFECT. Cilium's kube-proxy replacement dialled a SINGLE NODE. Re-confirmed live
before changing anything: all three prod cilium-agent pods carried
KUBERNETES_SERVICE_HOST=192.168.2.10 — k3s-prod-1's own address — while the kube-vip
VIP 192.168.2.9 was Running on all three nodes with a held lease. Lose prod-1 and the
CNI's control-plane path is dead on an "HA" cluster. clusters/prod's own comment said
the value must be the VIP and NOT .10, then called it "Not yet decided" — I treated
that stale comment as an open question when the evidence already settled it.
SPLIT, NOT REPOINT, because k3s_api_host had two consumers with opposite needs:
k3s_api_host unchanged — the FOUNDER's IP: the cold-bootstrap join
target and a tls-san. infra/tofu/outputs.tf GENERATES this
name, so renaming would ripple into tofu and the runbooks.
k3s_apiserver_endpoint NEW = {{ kube_vip_address }} — the HA address; what Cilium
consumes. Derived, not restated, so an environment overrides
ONE line and the VIP, the SAN and the CNI endpoint move
together. Prod needed no new override.
THE SECOND HAZARD, WHICH MY BRIEF DID NOT NAME and the agent found: pointing Cilium at
the VIP breaks a COLD bootstrap for the same reason the join would — site.yml ran
node-baseline -> k3s -> cilium, so Cilium would install against an address nothing
announced yet. That is the 2026-09-01 deadlock shape. Fixed by SEQUENCE, not value:
site.yml now imports kube-vip.yml BETWEEN k3s and cilium. It cannot go earlier
(kube-vip is a k3s auto-deploy manifest, so it needs a cluster) and it works there
because the DaemonSet is hostNetwork with KUBERNETES_SERVICE_HOST=127.0.0.1 — needing
neither CNI nor kube-proxy. roles/kube_vip gained a read-only `wait_for` on the VIP so
a cold run stops THERE with a named cause instead of surfacing as unreachable agents.
Also fixed a pre-existing bug that only mattered once this play joined site.yml: the
role's read-only interface probe ran without `check_mode: false`, so under --check it
was skipped and the assert fired with a misleading "set kube_vip_interface explicitly".
VERIFIED BY ME, not just reported:
renders dev K3S_API_HOST=192.168.1.49 prod=192.168.2.9 (each environment's VIP)
cilium template consumes k3s_apiserver_endpoint, not k3s_api_host
cold join still `--server https://{{ k3s_api_host }}:6443` — the founder
order site.yml: node-baseline -> k3s -> kube-vip -> cilium -> verify -> flux
gate full CI gate PASS
Agent-side, additionally: in-memory render of cilium-values.yaml.j2 per host showing
k8sServiceHost=the VIP with the join still on the founder; k3s_tls_sans renders
['.10','.9','127.0.0.1','.11','.12'] so NO cert reissue and NO k3s restart is involved
— .9 already answers under full CA verification; and --check --diff of kube-vip.yml
against prod reported 6 ok / 0 changed, i.e. the role edits change nothing about the
kube-vip prod already runs.
ha-control-plane-as-code 92 -> 112 assertions, turning two escalations into machine
checks: the Cilium template must use the endpoint var; the endpoint must derive from
kube_vip_address and k3s_api_host must not; per environment K3S_API_HOST must equal
that environment's VIP and be none of its node IPs (the [parity] contract, now
machine-checked rather than a comment); site.yml must order k3s -> kube-vip -> cilium.
Every new assertion mutation-tested and bites. One honest negative recorded: reverting
only the BASE default is not caught, because both overlays patch the key — the check
reads effective per-environment values, so the base default is unguarded.
APPLY ORDER, and this is the operator's step — nothing was applied:
PROD FIRST, and it is the low-risk direction (prod is the broken one). Push and let
Flux reconcile platform/cilium: the value change rolls the cilium-agent DaemonSet
ONE NODE AT A TIME (maxUnavailable: 1 — the knob that bounded the 2026-09-01
incident), it will not proceed past an unready pod, existing datapath survives an
agent restart, and .9 is already live before the change lands.
DEV SEPARATELY, operator present. Same mechanics but live dev agents dial
192.168.1.50, and dev is mid-DNS-migration on dev-live. Do not fold it into that.
ANSIBLE: nothing to run for either live cluster; the Ansible half matters only for a
cold build. Remove the now-redundant standalone kube-vip.yml step from any runbook.
NEW NAMED GAP, unwritten: the L2 test cannot assert the running agents' live
KUBERNETES_SERVICE_HOST, which is the drift the L0 check cannot see. Recorded in that
test's gap list.
Refs R-PLAT-01, R-NET-01, R-ENV-02.
Co-Authored-By: Claude Opus 5 <[email protected]>
211 lines
15 KiB
YAML
211 lines
15 KiB
YAML
---
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# cluster-vars — the overlay knob surface (R-ENV-02).
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#
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# This ConfigMap holds BASE DEFAULTS. Flux `postBuild.substituteFrom` injects these into every
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# `${TOKEN}` in platform/ and apps/ manifests at reconcile time. dev/ and prod/ overlays STRATEGIC-
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# MERGE PATCH this single ConfigMap — that patch is the *entire* difference between environments.
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#
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# Add a knob here (with a base default) before referencing `${KNOB}` in a component manifest, then
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# give each overlay its env-scoped value. Never fork a base manifest to differ per environment.
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apiVersion: v1
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kind: ConfigMap
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metadata:
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name: cluster-vars
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namespace: flux-system
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data:
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# --- identity of the environment ---
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CLUSTER_ENV: "base" # dev | prod (overlays set this)
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# --- DNS / TLS ---
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# THE platform hostname suffix. Every public hostname the cluster serves is `<svc>.${BASE_DOMAIN}`,
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# the wildcard cert is `*.${BASE_DOMAIN}`, coredns-custom answers the `${BASE_DOMAIN}` zone with
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# ${GATEWAY_VIP}, and every OIDC issuer/redirect URI is built from it.
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#
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# THIS KNOB WAS DEAD UNTIL 2026-09-04 — declared here but referenced by NO manifest, because every
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# hostname was hardcoded. That is what made the 2026-09-04 incident possible: prod and dev were
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# authored to serve the SAME hostnames out of the SAME Cloudflare zone, so prod's external-dns
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# (policy: sync, owner `default`) concluded it owned dev's public records and DELETED ALL OF THEM.
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# See infra/PROD-PROVISIONING.md §10. The fix is architectural: each environment gets its OWN
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# subdomain, so the two clusters can no longer describe the same name.
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#
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# dev -> home.keithjackson.dev (UNCHANGED — see below)
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# prod -> prod.home.keithjackson.dev
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#
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# DEV DELIBERATELY STAYS ON THE APEX `home.keithjackson.dev`. The target architecture puts dev on
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# `dev.home.keithjackson.dev` with apex CNAMEs `<svc>.home` -> `<svc>.prod.home`, but moving dev
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# relocates its Keycloak issuer, every OIDC client redirect URI, kubectl SSO, its wildcard cert and
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# the Gitea host that IS the GitOps source — on a live cluster. Deferred to phase 2
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# (infra/PROD-PROVISIONING.md §10). Base default is therefore the DEV value, the same convention as
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# GATEWAY_VIP / LONGHORN_DATA_PATH: the base default is the known-good working value, dev restates
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# it verbatim, and prod overrides it. Dev's rendered output is byte-identical to the pre-
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# tokenization hardcoded manifests (verified 2026-09-04, all 12 substituted paths).
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BASE_DOMAIN: "home.keithjackson.dev"
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# ExternalDNS `--domain-filter` (platform/externaldns/helmrelease.yaml). SAFETY NET #2 behind
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# EXTERNALDNS_TXT_OWNER_ID: a record whose name falls outside this filter is not even considered,
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# so it cannot be created, updated or deleted regardless of TXT ownership.
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#
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# DEV KEEPS THE ZONE APEX `keithjackson.dev`, and must: dev serves the `home.keithjackson.dev`
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# apex itself, and the Cloudflare provider filters the ACCOUNT'S ZONES by this value — a filter
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# that is a strict subdomain of the zone dropped the parent zone outright ("no hosted zone matching
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# record DNS Name", DECISIONS-LOG 2026-08) on the version in use then. So dev's value is unchanged
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# from the retired `DNS_ZONE` knob this replaces, and dev renders byte-identically.
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#
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# PROD NARROWS TO ITS OWN SUBTREE `prod.home.keithjackson.dev`. VERIFY ON PROD'S FIRST RECONCILE
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# (infra/PROD-PROVISIONING.md §10): if the zone-lookup limitation above still applies to the pinned
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# chart, prod's external-dns will select NO zone and create NO records. That failure is FAIL-CLOSED
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# — it can never delete another environment's records — and the fallback is to set prod's value
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# back to "keithjackson.dev", leaving EXTERNALDNS_TXT_OWNER_ID as the sole (and sufficient) guard.
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EXTERNALDNS_DOMAIN_FILTER: "keithjackson.dev"
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# ExternalDNS TXT registry owner id (`--txt-owner-id`). THE ROOT CAUSE OF THE 2026-09-04 INCIDENT:
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# neither cluster set it, so both inherited the chart default `default`, and ExternalDNS treats a
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# record whose TXT registry entry carries ITS OWN owner id as its own to reconcile — and with
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# `policy: sync`, to DELETE when no local resource claims it. Two clusters sharing an owner id on
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# one zone therefore garbage-collect each other. Each environment MUST have a distinct value.
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#
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# DEV MUST RENDER EXACTLY `default`. Dev's LIVE public records are already registered in Cloudflare
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# under owner `default`; changing dev's value would make dev's own external-dns stop recognising
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# them, and it would re-create duplicates alongside the orphaned originals. Dev's overlay pins it.
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#
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# THE BASE DEFAULT IS A NON-COLLIDING SENTINEL, deliberately NOT `default`. A new environment that
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# forgets this knob must not silently inherit dev's identity — that is precisely the incident. With
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# this sentinel such a cluster owns nothing, so it can DELETE nothing; it would publish under a
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# visibly wrong owner id (grep the TXT records) instead of destroying a live environment's DNS.
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EXTERNALDNS_TXT_OWNER_ID: "unset-see-cluster-vars"
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ACME_CLUSTER_ISSUER: "letsencrypt-staging" # dev: staging | prod: letsencrypt-prod (ADR-0006)
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GATEWAY_VIP: "192.168.1.53" # in-cluster split-horizon target (R-DNS-01/03): the L2-announced
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# ingress VIP of the `shared` Gateway. MUST equal the FIRST address of
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# ${CILIUM_LB_POOL_START}..${CILIUM_LB_POOL_STOP} below — the Gateway
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# takes the pool's first free IP, and coredns-custom answers
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# *.home.keithjackson.dev with THIS so pod -> public-hostname traffic
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# hairpins through the Gateway (correct SNI -> wildcard cert).
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# Base default = the DEV LAN VIP (was 10.73.0.240, an address on the
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# long-RETIRED libvirt network — corrected 2026-08-31 so an overlay that
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# forgets this knob at least lands on a REAL network). A prod overlay
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# MUST still set the prod LAN VIP alongside the prod L2 pool range.
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# --- LAN addressing (R-ENV-02) — the ONE block every new environment must re-supply -------------
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# These were HARDCODED into base manifests until 2026-08-31, which broke the golden constraint:
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# `clusters/prod` would have rendered the DEV LAN (192.168.1.0/24) onto the prod LAN (192.168.2.0/24)
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# — a silent, cross-environment IP collision. They are knobs now. Base defaults ARE the dev values
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# (same convention as GATEWAY_VIP above: the base default is the known-good working value), so the
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# dev overlay restates them verbatim and a prod overlay MUST override EVERY knob in this block
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# before `flux bootstrap --path=clusters/prod`.
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#
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# Substitution coverage (verify before adding a knob here): every path that consumes these declares
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# postBuild.substituteFrom cluster-vars — platform (K3S_API_HOST), platform-config
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# (CILIUM_LB_POOL_*, S3_BACKUP_ENDPOINT), crafty (CRAFTY_L4_VIP), apps-wave-0 (S3_BACKUP_ENDPOINT),
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# velero (S3_BACKUP_ENDPOINT), apps-vms (UNIFI_L4_VIP). A ${TOKEN} in an UNSUBSTITUTED path would
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# ship the literal string into the cluster.
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# k3s API endpoint Cilium's kube-proxy replacement dials (platform/cilium/helmrelease.yaml).
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#
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# *** THIS IS THE CONTROL-PLANE VIP (kube-vip), NOT A NODE ADDRESS. *** Operator decision
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# 2026-09-06. It was each environment's PRIMARY NODE IP until then, which made the CNI's
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# control-plane path depend on one machine in a cluster whose entire purpose is HA: verified on
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# live prod, all three cilium-agents carried KUBERNETES_SERVICE_HOST=192.168.2.10 (k3s-prod-1's
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# own address) while kube-vip held 192.168.2.9. Losing that node leaves the datapath running off
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# Cilium's cache while NO service or policy update lands — a silent, unbounded staleness, not an
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# outage you would notice. A virtual address that follows the control plane is the fix, and it is
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# what kube-vip was stood up to provide.
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#
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# dev -> 192.168.1.49 (= kube_vip_address, group_vars/all.yml; base default, below)
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# prod -> 192.168.2.9 (= kube_vip_address, group_vars/k3s_prod/vars.yml)
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#
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# THE NAME IS NOW SLIGHTLY WRONG AND IS KEPT ANYWAY: renaming the knob would be a second,
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# unrelated change to every substituting Kustomization at the same time as a live CNI endpoint
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# move. Read it as "the API host Cilium dials", which is what it always meant.
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#
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# [parity] MUST equal the Ansible bootstrap's **k3s_apiserver_endpoint** for the SAME environment
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# (infra/ansible/inventory/group_vars/all.yml -> roles/cilium/templates/cilium-values.yaml.j2,
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# already inventory-parameterized). NOT k3s_api_host — that variable still exists and still holds
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# the FOUNDER's address, because the cold-bootstrap `--server` join needs a machine that is
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# already up before any VIP exists. The two are deliberately separate; see the TWO API ADDRESSES
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# block at the top of group_vars/all.yml.
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#
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# Wrong value = Cilium cannot reach the API server on adopt and the CNI breaks. Port stays 6443
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# in both envs, so it is NOT a knob.
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#
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# TLS needs nothing: k3s_tls_sans has always carried kube_vip_address alongside every node IP, so
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# both addresses are already in the serving cert (verified live 2026-09-06 — prod answers through
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# https://192.168.2.9:6443 under full CA verification). No cert reissue, no k3s restart.
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K3S_API_HOST: "192.168.1.49"
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# CiliumLoadBalancerIPPool `default-pool` (platform-config/cilium/l2-ip-pool.yaml): the VIP range
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# L2-announced on the flat LAN. Must sit OUTSIDE the node IPs and any DHCP scope, and must match the
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# tofu reservation (cilium_l2_vip_range). INVARIANT: ${GATEWAY_VIP} must be INSIDE this range and in
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# practice EQUAL to START — the `shared` Gateway pins no address, so LB-IPAM hands it the pool's
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# first free IP. (⚠ the operator-supplied PROD values currently break this; see l2-ip-pool.yaml and
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# the flagged block in clusters/prod/kustomization.yaml.)
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CILIUM_LB_POOL_START: "192.168.1.53"
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CILIUM_LB_POOL_STOP: "192.168.1.60"
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# Pinned VIPs carved out of that pool by name (lbipam.cilium.io/ips). These are L4 workloads the
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# HTTPS Gateway cannot express (raw TCP/UDP), so they hold their own stable address:
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UNIFI_L4_VIP: "192.168.1.54" # UniFi controller VM: inform/STUN/adoption (apps/vms/unifi)
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CRAFTY_L4_VIP: "192.168.1.55" # Crafty: Minecraft Java (TCP) + Bedrock (UDP) game ports
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# Off-cluster S3 backup target (R-STATE-03, R-IDP-05) — the on-Proxmox MinIO, plain HTTP, path-style.
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# Consumed by BOTH backup paths: every CNPG Cluster's barmanObjectStore.endpointURL (keycloak-db,
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# nextcloud-db, semaphore-db) and Velero's backupStorageLocation s3Url. Full URL incl. scheme+port.
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# Prod needs its OWN target: a backup that lands on the dev LAN's MinIO is not off-cluster DR.
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S3_BACKUP_ENDPOINT: "http://192.168.1.9:9000"
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# --- storage (ADR-0003) ---
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LONGHORN_DEFAULT_REPLICA_COUNT: "3" # default StorageClass replica count (3 on 3 nodes)
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# Longhorn's defaultDataPath (platform/longhorn/helmrelease.yaml): the on-NODE directory every
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# replica is written into. It must be the path the NODE's own data disk is actually mounted at —
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# roles/node_baseline owns that half (node_baseline_longhorn_data_path), and the two are ONE
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# fact stated in two places, so [parity] holds per environment or replicas land on the OS disk.
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# Base default = the DEV value, same convention as GATEWAY_VIP / the LAN block: the known-good
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# working value. Dev's dedicated /dev/vdb IS mounted here and the LIVE cluster has 18 volumes
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# on it — changing dev's value would orphan every replica, so the dev overlay restates it
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# verbatim. PROD DIFFERS: its data partition serves TWO tenants (Longhorn plus k3s's whole data
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# dir, moved off the 11.8 GiB /var — infra/PROD-PROVISIONING.md §2), so it is mounted at the
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# neutral /data and Longhorn gets the /data/longhorn SUBDIRECTORY, not the mount root.
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LONGHORN_DATA_PATH: "/var/lib/longhorn"
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# --- observability sizing (docs/10) ---
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MONITORING_PROMETHEUS_RETENTION: "7d" # dev short | prod long
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MONITORING_PROMETHEUS_PVC_SIZE: "10Gi"
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# SIZE-based retention cap for Prometheus (Prometheus *iB units, NOT the K8s `Gi` of the PVC knob).
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# MUST stay below MONITORING_PROMETHEUS_PVC_SIZE — leaves headroom for the WAL + head + compaction
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# scratch (retentionSize counts only persisted blocks). Prevents a busy TSDB from filling /prometheus
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# (a full disk wedges all WAL commits and makes every absent()/==0 alert fire falsely). Base 10Gi PVC.
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MONITORING_PROMETHEUS_RETENTION_SIZE: "8GiB"
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MONITORING_LOKI_PVC_SIZE: "10Gi"
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# --- admission enforcement (Kyverno, ADR-0011). Base defaults are the STRICT/prod posture;
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# the dev overlay softens them for bootstrap (Audit / Ignore / 1) so a cold cluster can
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# come up before policies are proven and admission is HA. ---
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KYVERNO_VALIDATION_ACTION: "Enforce" # dev: Audit (observe before enforcing)
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KYVERNO_FORCE_FAILURE_POLICY_IGNORE: "false" # dev: "true" (chart forceFailurePolicyIgnore = fail-open)
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KYVERNO_ADMISSION_REPLICAS: "3" # dev: 1 (no HA needed to iterate)
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# --- egress / VPN (Phase 3, ADR-0015) — node-level host OpenVPN tunnel steered by Cilium Egress
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# Gateway (platform/vpn-egress/egress-steering.yaml). No in-cluster gateway pod. ---
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PIA_REGION: "SE Stockholm" # PF-capable PIA region (Sweden). Under ADR-0015 the tunnel is
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# host-side (Ansible vault / the node's .ovpn per docs/07), so this
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# is now a reference default only — retained, not substituted into
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# any manifest. ("SE Stockholm" is PF-capable; NOT "SE Streaming
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# Optimized" / a US region, which lack PF.)
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CLUSTER_POD_CIDR: "10.0.0.0/16" # Documents the Cilium cluster-pool pod CIDR that the egress-steering
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# CiliumEgressGatewayPolicy carves out of the tunnel via excludedCIDRs
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# (kept on the LOCAL datapath, never SNAT'd out tun0). The policy
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# currently excludes the whole /8 RFC1918 range; this /16 records the
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# actual pod allocations (Cilium assigns /24 per node from 10.0.0.0 up).
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# --- identity / auth (ADR-0014) ---
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KEYCLOAK_REPLICAS: "1" # dev 1 | prod 2 (HA)
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OAUTH2_PROXY_REPLICAS: "1" # dev 1 | prod 2 (HA)
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# --- backup / DR (ADR-0003, R-STATE-03) ---
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VELERO_BACKUP_SCHEDULE: "0 3 * * *" # cron; overlays may differ
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VELERO_RETENTION: "168h" # dev short | prod long
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# --- placement ---
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PLATFORM_NODE_SELECTOR_KEY: "kubernetes.io/os" # base no-op selector; prod may pin roles
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PLATFORM_NODE_SELECTOR_VALUE: "linux"
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