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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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36
kube/k8s-proxy/conf/conf.go
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@@ -49,21 +49,23 @@ type VersionedConfig struct {
}
type ConfigV1Alpha1 struct {
AuthKey *string `json:",omitempty"` // Tailscale auth key to use.
State *string `json:",omitempty"` // Path to the Tailscale state.
LogLevel *string `json:",omitempty"` // "debug", "info". Defaults to "info".
App *string `json:",omitempty"` // e.g. kubetypes.AppProxyGroupKubeAPIServer
ServerURL *string `json:",omitempty"` // URL of the Tailscale coordination server.
// StaticEndpoints are additional, user-defined endpoints that this node
// should advertise amongst its wireguard endpoints.
StaticEndpoints []netip.AddrPort `json:",omitempty"`
AuthKey *string `json:",omitempty"` // Tailscale auth key to use.
State *string `json:",omitempty"` // Path to the Tailscale state.
LogLevel *string `json:",omitempty"` // "debug", "info". Defaults to "info".
App *string `json:",omitempty"` // e.g. kubetypes.AppProxyGroupKubeAPIServer
ServerURL *string `json:",omitempty"` // URL of the Tailscale coordination server.
LocalAddr *string `json:",omitempty"` // The address to use for serving HTTP health checks and metrics (defaults to all interfaces).
LocalPort *uint16 `json:",omitempty"` // The port to use for serving HTTP health checks and metrics (defaults to 9002).
MetricsEnabled opt.Bool `json:",omitempty"` // Serve metrics on <LocalAddr>:<LocalPort>/metrics.
HealthCheckEnabled opt.Bool `json:",omitempty"` // Serve health check on <LocalAddr>:<LocalPort>/metrics.
// TODO(tomhjp): The remaining fields should all be reloadable during
// runtime, but currently missing most of the APIServerProxy fields.
Hostname *string `json:",omitempty"` // Tailscale device hostname.
AcceptRoutes *bool `json:",omitempty"` // Accepts routes advertised by other Tailscale nodes.
AcceptRoutes opt.Bool `json:",omitempty"` // Accepts routes advertised by other Tailscale nodes.
AdvertiseServices []string `json:",omitempty"` // Tailscale Services to advertise.
APIServerProxy *APIServerProxyConfig `json:",omitempty"` // Config specific to the API Server proxy.
StaticEndpoints []netip.AddrPort `json:",omitempty"` // StaticEndpoints are additional, user-defined endpoints that this node should advertise amongst its wireguard endpoints.
}
type APIServerProxyConfig struct {
@@ -108,3 +110,19 @@ func Load(raw []byte) (c Config, err error) {
return c, nil
}
func (c *Config) GetLocalAddr() string {
if c.Parsed.LocalAddr == nil {
return "[::]"
}
return *c.Parsed.LocalAddr
}
func (c *Config) GetLocalPort() uint16 {
if c.Parsed.LocalPort == nil {
return uint16(9002)
}
return *c.Parsed.LocalPort
}