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89a3502446b939036b030333301e4c518f78e93e
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5 Commits

Author SHA1 Message Date
Donavan Fritz 89a3502446 M6: anycast — pod lo + Ready-gated /128/32 + BIRD export
Build flock Image / build (push) Has been cancelled
Details 
CNI ADD now adds anycast IPs to the pod's lo interface (NOT eth0 — design
doc rationale: avoid NDP/ARP DAD conflicts when N replicas share an IP).
Allocation persists the anycast list.

AnycastReconciler:
  desired = { ip → flock<8hex> } from
            committed allocations × pod.Status.PodReady=True
  diff against advertised, install/remove host /128 (v6) or /32 (v4)
  re-render bird.conf with the active set

Triggers: 2s tick, AfterCommit (per ADD/DEL), Pod informer Ready
transitions (PodCache.OnReadyChange callback).

The bird template already supported Anycast6/Anycast4 via the export
filter — this turn finally drives those slices from runtime.

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
 2026-04-25 07:36:47 -05:00
Donavan Fritz c7fb159632 agent: maintain NetworkUnavailable=False on owned nodes
Build flock Image / build (push) Has been cancelled
Details 
When Calico shuts down on a flock-labeled node, calico-node sets
NetworkUnavailable=True with reason CalicoIsDown. Nothing replaces it,
so kubelet's NodeController applies node.kubernetes.io/network-
unavailable:NoSchedule and new pods can't land.

flock-agent now patches Status.Conditions every 60s with
NetworkUnavailable=False (reason=FlockReady). RBAC: nodes/status patch.

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
 2026-04-24 23:11:47 -05:00
Donavan Fritz 37cc3f6750 runtime: enable BIRD BGP on flock-labeled nodes
Build flock Image / build (push) Has been cancelled
Details 
Calico fenced off via Tigera Installation CR (apps@2121892). flock-agent
now renders bird.conf with the per-node BGP peers; bird sidecar reloads
on changes (debounced 500ms). Re-render tick every 15s reacts to
NodeConfig updates.

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
 2026-04-24 23:02:33 -05:00
Donavan Fritz 06110884d4 runtime: skip BIRD render on first cutover
Build flock Image / build (push) Has been cancelled
Details 
Calico's calico-node still runs on every node (Tigera-Operator-managed
via ArgoCD with selfHeal). Two birds with the same ASN can't peer to
crt001 from the same source. Use a manual static route on crt001 for
the flock /64 for the first cutover; switch to live BGP after Calico is
fenced off flock-labeled nodes.

The bird sidecar stays running with the bootstrap config (kernel +
device only, no BGP), so flipping live BGP on later is a single-line
change in runtime_linux.go.

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
 2026-04-24 22:41:40 -05:00
Donavan Fritz eb1f5e0d8d M2: netlink, IPAM/handler wiring, BIRD sidecar, CNI installer
Build flock Image / build (push) Has been cancelled
Details 
Code (Linux build, with no-op stubs for macOS dev):
- pkg/agent/netns_linux.go: ensureVeth → host-side configure (addrgenmode
  none, fe80::1/64, proxy_arp, forwarding) → move peer to pod ns →
  configure pod side (addr, default route via fe80::1, v4 169.254.1.1
  on-link gateway) → host /128 + /32 routes. Idempotent.
- pkg/agent/hostiface.go: deterministic host iface name flock<8hex> from
  FNV-1a-32(containerID).
- pkg/agent/annotations.go: parse flock.fritzlab.net/{ipv6,ipv4,cidr6,
  cidr4,ip-algo,anycast} with design-doc defaults; ParseCNIArgs for the
  K8S_POD_* keys kubelet sets.
- pkg/agent/podinfo.go: shared informer scoped to spec.nodeName==NODE,
  WaitForPod helper for ADD-vs-informer-sync race.
- pkg/agent/handlers.go: PodHandler does
    cache lookup → annotations → IPAM → store(pending) → SetupFunc →
    store(committed) → Result. Idempotent on retry. Del symmetric.
- pkg/routing/bird/config.go: text/template render with stable ordering;
  golden tests for host001 + anycast injection + sort stability.
- pkg/agent/bird.go: writes /etc/flock/bird/bird.conf, debounces 500ms,
  execs `birdc -s /run/flock/bird.ctl configure`. Installs blackhole
  kernel routes for the node summary CIDRs so BIRD's protocol kernel
  imports them.
- pkg/agent/runtime_linux.go: at startup, waits up to 60s for the per-
  node NodeConfig, reconciles committed allocations into IPAM.used,
  garbage-collects pending entries, builds PodHandler, swaps RPC
  handlers in.
- cmd/flock-installer: init-container binary that copies /opt/cni/bin/
  flock and writes 01-flock.conflist (lex-first so kubelet picks it
  over Calico's 10-calico.conflist on flock-labeled nodes).

Deploy:
- Dockerfile: alpine + iproute2 + bird2; multi-binary image.
- deploy/daemonset.yaml: install-cni init container; bird sidecar
  sharing /etc/flock/bird + /run/flock with the agent; ConfigMap-seeded
  bootstrap bird.conf so the sidecar boots before the agent renders.
  Privileged on flock-agent + install-cni; bird sidecar uses
  NET_ADMIN/RAW only.
- RBAC: pods + networkpolicies get/list/watch (the latter is reserved
  for M8 — harmless to grant now).

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
 2026-04-24 22:33:48 -05:00