Expose kube-api burst/qps settings for kube components

Default to hardcodes for components that had them, and 5.0 qps, 10 burst
for those that relied on client defaults

Unclear if maybe it'd be better to just assume these are set as part of
the incoming kubeconfig.  For now just exposing them as flags since it's
easier for me to manually tweak.

cmd/kube-controller-manager/app/controllermanager.go

@@ -99,6 +99,8 @@ type CMServer struct {
 
 	Master       string
 	Kubeconfig   string
+	KubeApiQps   float32
+	KubeApiBurst int
 }
 
 // NewCMServer creates a new CMServer with a default config.
@@ -128,6 +130,8 @@ func NewCMServer() *CMServer {
 			PersistentVolumeRecyclerMinimumTimeoutHostPath:   60,
 			PersistentVolumeRecyclerIncrementTimeoutHostPath: 30,
 		},
+		KubeApiQps:   20.0,
+		KubeApiBurst: 30,
 	}
 	return &s
 }
@@ -193,6 +197,8 @@ func (s *CMServer) AddFlags(fs *pflag.FlagSet) {
 	fs.StringVar(&s.Kubeconfig, "kubeconfig", s.Kubeconfig, "Path to kubeconfig file with authorization and master location information.")
 	fs.StringVar(&s.RootCAFile, "root-ca-file", s.RootCAFile, "If set, this root certificate authority will be included in service account's token secret. This must be a valid PEM-encoded CA bundle.")
 	fs.BoolVar(&s.EnableExperimental, "enable-experimental", s.EnableExperimental, "Enables experimental controllers (requires enabling experimental API on apiserver).")
+	fs.Float32Var(&s.KubeApiQps, "kube-api-qps", s.KubeApiQps, "QPS to use while talking with kubernetes apiserver")
+	fs.IntVar(&s.KubeApiBurst, "kube-api-burst", s.KubeApiBurst, "Burst to use while talking with kubernetes apiserver")
 }
 
 func (s *CMServer) resyncPeriod() time.Duration {
@@ -215,8 +221,9 @@ func (s *CMServer) Run(_ []string) error {
 		return err
 	}
 
-	kubeconfig.QPS = 20.0
+	// Override kubeconfig qps/burst settings from flags
-	kubeconfig.Burst = 30
+	kubeconfig.QPS = s.KubeApiQps
+	kubeconfig.Burst = s.KubeApiBurst
 
 	kubeClient, err := client.New(kubeconfig)
 	if err != nil {

cmd/kube-proxy/app/server.go

@@ -64,6 +64,8 @@ type ProxyServerConfig struct {
 	nodeRef            *api.ObjectReference // Reference to this node.
 	MasqueradeAll      bool
 	CleanupAndExit     bool
+	KubeApiQps         float32
+	KubeApiBurst       int
 }
 
 type ProxyServer struct {
@@ -93,6 +95,8 @@ func (s *ProxyServerConfig) AddFlags(fs *pflag.FlagSet) {
 	fs.DurationVar(&s.SyncPeriod, "iptables-sync-period", s.SyncPeriod, "How often iptables rules are refreshed (e.g. '5s', '1m', '2h22m').  Must be greater than 0.")
 	fs.BoolVar(&s.MasqueradeAll, "masquerade-all", false, "If using the pure iptables proxy, SNAT everything")
 	fs.BoolVar(&s.CleanupAndExit, "cleanup-iptables", false, "If true cleanup iptables rules and exit.")
+	fs.Float32Var(&s.KubeApiQps, "kube-api-qps", s.KubeApiQps, "QPS to use while talking with kubernetes apiserver")
+	fs.IntVar(&s.KubeApiBurst, "kube-api-burst", s.KubeApiBurst, "Burst to use while talking with kubernetes apiserver")
 }
 
 const (
@@ -117,6 +121,8 @@ func NewProxyConfig() *ProxyServerConfig {
 		OOMScoreAdj:        qos.KubeProxyOOMScoreAdj,
 		ResourceContainer:  "/kube-proxy",
 		SyncPeriod:         30 * time.Second,
+		KubeApiQps:         5.0,
+		KubeApiBurst:       10,
 	}
 }
 
@@ -195,6 +201,11 @@ func NewProxyServerDefault(config *ProxyServerConfig) (*ProxyServer, error) {
 	if err != nil {
 		return nil, err
 	}
+
+	// Override kubeconfig qps/burst settings from flags
+	kubeconfig.QPS = config.KubeApiQps
+	kubeconfig.Burst = config.KubeApiBurst
+
 	client, err := kubeclient.New(kubeconfig)
 	if err != nil {
 		glog.Fatalf("Invalid API configuration: %v", err)

cmd/kubelet/app/server.go

@@ -143,6 +143,9 @@ type KubeletServer struct {
 	ChaosChance float64
 	// Crash immediately, rather than eating panics.
 	ReallyCrashForTesting bool
+
+	KubeApiQps   float32
+	KubeApiBurst int
 }
 
 // bootstrapping interface for kubelet, targets the initialization protocol
@@ -206,6 +209,8 @@ func NewKubeletServer() *KubeletServer {
 		SyncFrequency:       10 * time.Second,
 		SystemContainer:     "",
 		ReconcileCIDR:       true,
+		KubeApiQps:          5.0,
+		KubeApiBurst:        10,
 	}
 }
 
@@ -285,6 +290,8 @@ func (s *KubeletServer) AddFlags(fs *pflag.FlagSet) {
 	fs.Uint64Var(&s.MaxOpenFiles, "max-open-files", 1000000, "Number of files that can be opened by Kubelet process. [default=1000000]")
 	fs.BoolVar(&s.ReconcileCIDR, "reconcile-cidr", s.ReconcileCIDR, "Reconcile node CIDR with the CIDR specified by the API server. No-op if register-node or configure-cbr0 is false. [default=true]")
 	fs.BoolVar(&s.RegisterSchedulable, "register-schedulable", s.RegisterSchedulable, "Register the node as schedulable. No-op if register-node is false. [default=true]")
+	fs.Float32Var(&s.KubeApiQps, "kube-api-qps", s.KubeApiQps, "QPS to use while talking with kubernetes apiserver")
+	fs.IntVar(&s.KubeApiBurst, "kube-api-burst", s.KubeApiBurst, "Burst to use while talking with kubernetes apiserver")
 }
 
 // UnsecuredKubeletConfig returns a KubeletConfig suitable for being run, or an error if the server setup
@@ -580,6 +587,11 @@ func (s *KubeletServer) CreateAPIServerClientConfig() (*client.Config, error) {
 	if err != nil {
 		return nil, err
 	}
+
+	// Override kubeconfig qps/burst settings from flags
+	clientConfig.QPS = s.KubeApiQps
+	clientConfig.Burst = s.KubeApiBurst
+
 	s.addChaosToClientConfig(clientConfig)
 	return clientConfig, nil
 }

hack/verify-flags/known-flags.txt

@@ -129,6 +129,8 @@ ir-user
 jenkins-host
 jenkins-jobs
 km-path
+kube-api-burst
+kube-api-qps
 kubectl-path
 kubelet-cadvisor-port
 kubelet-certificate-authority

plugin/cmd/kube-scheduler/app/server.go

@@ -56,6 +56,8 @@ type SchedulerServer struct {
 	Kubeconfig        string
 	BindPodsQPS       float32
 	BindPodsBurst     int
+	KubeApiQps        float32
+	KubeApiBurst      int
 }
 
 // NewSchedulerServer creates a new SchedulerServer with default parameters
@@ -64,6 +66,10 @@ func NewSchedulerServer() *SchedulerServer {
 		Port:              ports.SchedulerPort,
 		Address:           net.ParseIP("127.0.0.1"),
 		AlgorithmProvider: factory.DefaultProvider,
+		BindPodsQPS:       50.0,
+		BindPodsBurst:     100,
+		KubeApiQps:        50.0,
+		KubeApiBurst:      100,
 	}
 	return &s
 }
@@ -77,8 +83,10 @@ func (s *SchedulerServer) AddFlags(fs *pflag.FlagSet) {
 	fs.BoolVar(&s.EnableProfiling, "profiling", true, "Enable profiling via web interface host:port/debug/pprof/")
 	fs.StringVar(&s.Master, "master", s.Master, "The address of the Kubernetes API server (overrides any value in kubeconfig)")
 	fs.StringVar(&s.Kubeconfig, "kubeconfig", s.Kubeconfig, "Path to kubeconfig file with authorization and master location information.")
-	fs.Float32Var(&s.BindPodsQPS, "bind-pods-qps", 50.0, "Number of bindings per second scheduler is allowed to continuously make")
+	fs.Float32Var(&s.BindPodsQPS, "bind-pods-qps", s.BindPodsQPS, "Number of bindings per second scheduler is allowed to continuously make")
-	fs.IntVar(&s.BindPodsBurst, "bind-pods-burst", 100, "Number of bindings per second scheduler is allowed to make during bursts")
+	fs.IntVar(&s.BindPodsBurst, "bind-pods-burst", s.BindPodsBurst, "Number of bindings per second scheduler is allowed to make during bursts")
+	fs.Float32Var(&s.KubeApiQps, "kube-api-qps", s.KubeApiQps, "QPS to use while talking with kubernetes apiserver")
+	fs.IntVar(&s.KubeApiBurst, "kube-api-burst", s.KubeApiBurst, "Burst to use while talking with kubernetes apiserver")
 }
 
 // Run runs the specified SchedulerServer.  This should never exit.
@@ -95,8 +103,10 @@ func (s *SchedulerServer) Run(_ []string) error {
 	if err != nil {
 		return err
 	}
-	kubeconfig.QPS = 50.0
+
-	kubeconfig.Burst = 100
+	// Override kubeconfig qps/burst settings from flags
+	kubeconfig.QPS = s.KubeApiQps
+	kubeconfig.Burst = s.KubeApiBurst
 
 	kubeClient, err := client.New(kubeconfig)
 	if err != nil {