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cmd/{k8s-proxy,containerboot,k8s-operator},kube: add health check and metrics endpoints for k8s-proxy (#16540)

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* Modifies the k8s-proxy to expose health check and metrics
endpoints on the Pod's IP.

* Moves cmd/containerboot/healthz.go and cmd/containerboot/metrics.go to
  /kube to be shared with /k8s-proxy.

Updates #13358

Signed-off-by: David Bond <davidsbond93@gmail.com>
This commit is contained in:
David Bond
2025-07-22 17:07:51 +01:00
committed by GitHub
parent 22a8e0ac50
commit 4494705496
8 changed files with 196 additions and 82 deletions
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16
cmd/containerboot/main.go
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@@ -121,7 +121,9 @@ import (
"tailscale.com/client/tailscale"
"tailscale.com/ipn"
kubeutils "tailscale.com/k8s-operator"
healthz "tailscale.com/kube/health"
"tailscale.com/kube/kubetypes"
"tailscale.com/kube/metrics"
"tailscale.com/kube/services"
"tailscale.com/tailcfg"
"tailscale.com/types/logger"
@@ -232,13 +234,13 @@ func run() error {
}
defer killTailscaled()
var healthCheck *healthz
var healthCheck *healthz.Healthz
ep := &egressProxy{}
if cfg.HealthCheckAddrPort != "" {
mux := http.NewServeMux()
log.Printf("Running healthcheck endpoint at %s/healthz", cfg.HealthCheckAddrPort)
healthCheck = registerHealthHandlers(mux, cfg.PodIPv4)
healthCheck = healthz.RegisterHealthHandlers(mux, cfg.PodIPv4, log.Printf)
close := runHTTPServer(mux, cfg.HealthCheckAddrPort)
defer close()
@@ -249,12 +251,12 @@ func run() error {
if cfg.localMetricsEnabled() {
log.Printf("Running metrics endpoint at %s/metrics", cfg.LocalAddrPort)
registerMetricsHandlers(mux, client, cfg.DebugAddrPort)
metrics.RegisterMetricsHandlers(mux, client, cfg.DebugAddrPort)
}
if cfg.localHealthEnabled() {
log.Printf("Running healthcheck endpoint at %s/healthz", cfg.LocalAddrPort)
healthCheck = registerHealthHandlers(mux, cfg.PodIPv4)
healthCheck = healthz.RegisterHealthHandlers(mux, cfg.PodIPv4, log.Printf)
}
if cfg.egressSvcsTerminateEPEnabled() {
@@ -438,8 +440,8 @@ authLoop:
)
// egressSvcsErrorChan will get an error sent to it if this containerboot instance is configured to expose 1+
// egress services in HA mode and errored.
var egressSvcsErrorChan = make(chan error)
var ingressSvcsErrorChan = make(chan error)
egressSvcsErrorChan := make(chan error)
ingressSvcsErrorChan := make(chan error)
defer t.Stop()
// resetTimer resets timer for when to next attempt to resolve the DNS
// name for the proxy configured with TS_EXPERIMENTAL_DEST_DNS_NAME. The
@@ -644,7 +646,7 @@ runLoop:
}
if healthCheck != nil {
healthCheck.update(len(addrs) != 0)
healthCheck.Update(len(addrs) != 0)
}
if cfg.ServeConfigPath != "" {