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all-kube: create Tailscale Service for HA kube-apiserver ProxyGroup (#16572)

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Adds a new reconciler for ProxyGroups of type kube-apiserver that will
provision a Tailscale Service for each replica to advertise. Adds two
new condition types to the ProxyGroup, TailscaleServiceValid and
TailscaleServiceConfigured, to post updates on the state of that
reconciler in a way that's consistent with the service-pg reconciler.
The created Tailscale Service name is configurable via a new ProxyGroup
field spec.kubeAPISserver.ServiceName, which expects a string of the
form "svc:<dns-label>".

Lots of supporting changes were needed to implement this in a way that's
consistent with other operator workflows, including:

* Pulled containerboot's ensureServicesUnadvertised and certManager into
  kube/ libraries to be shared with k8s-proxy. Use those in k8s-proxy to
  aid Service cert sharing between replicas and graceful Service shutdown.
* For certManager, add an initial wait to the cert loop to wait until
  the domain appears in the devices's netmap to avoid a guaranteed error
  on the first issue attempt when it's quick to start.
* Made several methods in ingress-for-pg.go and svc-for-pg.go into
  functions to share with the new reconciler
* Added a Resource struct to the owner refs stored in Tailscale Service
  annotations to be able to distinguish between Ingress- and ProxyGroup-
  based Services that need cleaning up in the Tailscale API.
* Added a ListVIPServices method to the internal tailscale client to aid
  cleaning up orphaned Services
* Support for reading config from a kube Secret, and partial support for
  config reloading, to prevent us having to force Pod restarts when
  config changes.
* Fixed up the zap logger so it's possible to set debug log level.

Updates #13358

Change-Id: Ia9607441157dd91fb9b6ecbc318eecbef446e116
Signed-off-by: Tom Proctor <tomhjp@users.noreply.github.com>
This commit is contained in:
Tom Proctor
2025-07-21 11:03:21 +01:00
committed by GitHub
parent 5adde9e3f3
commit f421907c38
39 changed files with 2551 additions and 397 deletions
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10
cmd/containerboot/serve.go
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@@ -19,7 +19,9 @@ import (
"github.com/fsnotify/fsnotify"
"tailscale.com/client/local"
"tailscale.com/ipn"
"tailscale.com/kube/certs"
"tailscale.com/kube/kubetypes"
klc "tailscale.com/kube/localclient"
"tailscale.com/types/netmap"
)
@@ -52,11 +54,9 @@ func watchServeConfigChanges(ctx context.Context, cdChanged <-chan bool, certDom
var certDomain string
var prevServeConfig *ipn.ServeConfig
var cm certManager
var cm *certs.CertManager
if cfg.CertShareMode == "rw" {
cm = certManager{
lc: lc,
}
cm = certs.NewCertManager(klc.New(lc), log.Printf)
}
for {
select {
@@ -93,7 +93,7 @@ func watchServeConfigChanges(ctx context.Context, cdChanged <-chan bool, certDom
if cfg.CertShareMode != "rw" {
continue
}
if err := cm.ensureCertLoops(ctx, sc); err != nil {
if err := cm.EnsureCertLoops(ctx, sc); err != nil {
log.Fatalf("serve proxy: error ensuring cert loops: %v", err)
}
}