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Merge pull request #58367 from zhangxiaoyu-zidif/do-issue-41161
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Remove deprecated --require-kubeconfig flag, remove default --kubeconfig value

**What this PR does / why we need it**:

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #41161

**Special notes for your reviewer**:

**Release note**:

```release-note
Remove deprecated --require-kubeconfig flag, remove default --kubeconfig value
```
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Kubernetes Submit Queue authored Jan 29, 2018
2 parents 480327e + aaf0745 commit 6def29e
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Showing 3 changed files with 50 additions and 69 deletions.
16 changes: 6 additions & 10 deletions cmd/kubelet/app/options/options.go
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Original file line number Diff line number Diff line change
Expand Up @@ -48,7 +48,7 @@ import (
// In general, please try to avoid adding flags or configuration fields,
// we already have a confusingly large amount of them.
type KubeletFlags struct {
KubeConfig flag.StringFlag
KubeConfig string
BootstrapKubeconfig string
RotateCertificates bool

Expand Down Expand Up @@ -178,8 +178,6 @@ type KubeletFlags struct {
// schedulable. Won't have any effect if register-node is false.
// DEPRECATED: use registerWithTaints instead
RegisterSchedulable bool
// RequireKubeConfig is deprecated! A valid KubeConfig is now required if --kubeconfig is provided.
RequireKubeConfig bool
// nonMasqueradeCIDR configures masquerading: traffic to IPs outside this range will use IP masquerade.
NonMasqueradeCIDR string
// This flag, if set, instructs the kubelet to keep volumes from terminated pods mounted to the node.
Expand Down Expand Up @@ -212,9 +210,6 @@ func NewKubeletFlags() *KubeletFlags {
}

return &KubeletFlags{
// TODO(#41161:v1.10.0): Remove the default kubeconfig path and --require-kubeconfig.
RequireKubeConfig: false,
KubeConfig: flag.NewStringFlag("/var/lib/kubelet/kubeconfig"),
ContainerRuntimeOptions: *NewContainerRuntimeOptions(),
CertDirectory: "/var/lib/kubelet/pki",
RootDirectory: v1alpha1.DefaultRootDir,
Expand Down Expand Up @@ -304,13 +299,14 @@ func (s *KubeletServer) AddFlags(fs *pflag.FlagSet) {
func (f *KubeletFlags) AddFlags(fs *pflag.FlagSet) {
f.ContainerRuntimeOptions.AddFlags(fs)

fs.Var(&f.KubeConfig, "kubeconfig", "Path to a kubeconfig file, specifying how to connect to the API server.")
// TODO(#41161:v1.10.0): Remove the default kubeconfig path and --require-kubeconfig.
fs.BoolVar(&f.RequireKubeConfig, "require-kubeconfig", f.RequireKubeConfig, "This flag is no longer necessary. It has been deprecated and will be removed in a future version.")
fs.MarkDeprecated("require-kubeconfig", "You no longer need to use --require-kubeconfig. This will be removed in a future version. Providing --kubeconfig enables API server mode, omitting --kubeconfig enables standalone mode unless --require-kubeconfig=true is also set. In the latter case, the legacy default kubeconfig path will be used until --require-kubeconfig is removed.")
fs.StringVar(&f.KubeConfig, "kubeconfig", f.KubeConfig, "Path to a kubeconfig file, specifying how to connect to the API server. Providing --kubeconfig enables API server mode, omitting --kubeconfig enables standalone mode.")

fs.MarkDeprecated("experimental-bootstrap-kubeconfig", "Use --bootstrap-kubeconfig")
fs.StringVar(&f.BootstrapKubeconfig, "experimental-bootstrap-kubeconfig", f.BootstrapKubeconfig, "deprecated: use --bootstrap-kubeconfig")
// TODO: when pull-kubernetes-e2e-kops-aws does not need this parameter, delete requireKubeConfig.
var requireKubeConfig bool
fs.BoolVar(&requireKubeConfig, "require-kubeconfig", requireKubeConfig, "This flag is no longer necessary. It has been deprecated and will be removed in a future version.")
fs.MarkDeprecated("require-kubeconfig", "You no longer need to use --require-kubeconfig. This will be removed in a future version. Providing --kubeconfig enables API server mode, omitting --kubeconfig enables standalone mode unless --require-kubeconfig=true is also set. In the latter case, the legacy default kubeconfig path will be used until --require-kubeconfig is removed.")
fs.StringVar(&f.BootstrapKubeconfig, "bootstrap-kubeconfig", f.BootstrapKubeconfig, "Path to a kubeconfig file that will be used to get client certificate for kubelet. "+
"If the file specified by --kubeconfig does not exist, the bootstrap kubeconfig is used to request a client certificate from the API server. "+
"On success, a kubeconfig file referencing the generated client certificate and key is written to the path specified by --kubeconfig. "+
Expand Down
1 change: 0 additions & 1 deletion cmd/kubelet/app/options/options_test.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -36,7 +36,6 @@ func newKubeletServerOrDie() *KubeletServer {
}

func cleanFlags(s *KubeletServer) {
s.KubeConfig = utilflag.NewStringFlag(s.KubeConfig.Value())
s.DynamicConfigDir = utilflag.NewStringFlag(s.DynamicConfigDir.Value())
}

Expand Down
102 changes: 44 additions & 58 deletions cmd/kubelet/app/server.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -328,11 +328,7 @@ func run(s *options.KubeletServer, kubeDeps *kubelet.Dependencies) (err error) {

// About to get clients and such, detect standaloneMode
standaloneMode := true
switch {
case s.RequireKubeConfig == true:
standaloneMode = false
glog.Warningf("--require-kubeconfig is deprecated. Set --kubeconfig without using --require-kubeconfig.")
case s.KubeConfig.Provided():
if len(s.KubeConfig) > 0 {
standaloneMode = false
}

Expand Down Expand Up @@ -364,7 +360,7 @@ func run(s *options.KubeletServer, kubeDeps *kubelet.Dependencies) (err error) {
}

if s.BootstrapKubeconfig != "" {
if err := bootstrap.LoadClientCert(s.KubeConfig.Value(), s.BootstrapKubeconfig, s.CertDirectory, nodeName); err != nil {
if err := bootstrap.LoadClientCert(s.KubeConfig, s.BootstrapKubeconfig, s.CertDirectory, nodeName); err != nil {
return err
}
}
Expand All @@ -384,58 +380,52 @@ func run(s *options.KubeletServer, kubeDeps *kubelet.Dependencies) (err error) {
var externalKubeClient clientset.Interface

clientConfig, err := createAPIServerClientConfig(s)
if err != nil {
return fmt.Errorf("invalid kubeconfig: %v", err)
}

var clientCertificateManager certificate.Manager
if err == nil {
if s.RotateCertificates && utilfeature.DefaultFeatureGate.Enabled(features.RotateKubeletClientCertificate) {
clientCertificateManager, err = kubeletcertificate.NewKubeletClientCertificateManager(s.CertDirectory, nodeName, clientConfig.CertData, clientConfig.KeyData, clientConfig.CertFile, clientConfig.KeyFile)
if err != nil {
return err
}
// we set exitIfExpired to true because we use this client configuration to request new certs - if we are unable
// to request new certs, we will be unable to continue normal operation
if err := kubeletcertificate.UpdateTransport(wait.NeverStop, clientConfig, clientCertificateManager, true); err != nil {
return err
}
}

kubeClient, err = clientset.NewForConfig(clientConfig)
if s.RotateCertificates && utilfeature.DefaultFeatureGate.Enabled(features.RotateKubeletClientCertificate) {
clientCertificateManager, err = kubeletcertificate.NewKubeletClientCertificateManager(s.CertDirectory, nodeName, clientConfig.CertData, clientConfig.KeyData, clientConfig.CertFile, clientConfig.KeyFile)
if err != nil {
glog.Warningf("New kubeClient from clientConfig error: %v", err)
} else if kubeClient.CertificatesV1beta1() != nil && clientCertificateManager != nil {
glog.V(2).Info("Starting client certificate rotation.")
clientCertificateManager.SetCertificateSigningRequestClient(kubeClient.CertificatesV1beta1().CertificateSigningRequests())
clientCertificateManager.Start()
return err
}
externalKubeClient, err = clientset.NewForConfig(clientConfig)
if err != nil {
glog.Warningf("New kubeClient from clientConfig error: %v", err)
// we set exitIfExpired to true because we use this client configuration to request new certs - if we are unable
// to request new certs, we will be unable to continue normal operation
if err := kubeletcertificate.UpdateTransport(wait.NeverStop, clientConfig, clientCertificateManager, true); err != nil {
return err
}
}

// make a separate client for events
eventClientConfig := *clientConfig
eventClientConfig.QPS = float32(s.EventRecordQPS)
eventClientConfig.Burst = int(s.EventBurst)
eventClient, err = v1core.NewForConfig(&eventClientConfig)
if err != nil {
glog.Warningf("Failed to create API Server client for Events: %v", err)
}
kubeClient, err = clientset.NewForConfig(clientConfig)
if err != nil {
glog.Warningf("New kubeClient from clientConfig error: %v", err)
} else if kubeClient.CertificatesV1beta1() != nil && clientCertificateManager != nil {
glog.V(2).Info("Starting client certificate rotation.")
clientCertificateManager.SetCertificateSigningRequestClient(kubeClient.CertificatesV1beta1().CertificateSigningRequests())
clientCertificateManager.Start()
}
externalKubeClient, err = clientset.NewForConfig(clientConfig)
if err != nil {
glog.Warningf("New kubeClient from clientConfig error: %v", err)
}

// make a separate client for heartbeat with throttling disabled and a timeout attached
heartbeatClientConfig := *clientConfig
heartbeatClientConfig.Timeout = s.KubeletConfiguration.NodeStatusUpdateFrequency.Duration
heartbeatClientConfig.QPS = float32(-1)
heartbeatClient, err = v1core.NewForConfig(&heartbeatClientConfig)
if err != nil {
glog.Warningf("Failed to create API Server client for heartbeat: %v", err)
}
} else {
switch {
case s.RequireKubeConfig:
return fmt.Errorf("invalid kubeconfig: %v", err)
case s.KubeConfig.Provided():
glog.Warningf("invalid kubeconfig: %v", err)
}
// make a separate client for events
eventClientConfig := *clientConfig
eventClientConfig.QPS = float32(s.EventRecordQPS)
eventClientConfig.Burst = int(s.EventBurst)
eventClient, err = v1core.NewForConfig(&eventClientConfig)
if err != nil {
glog.Warningf("Failed to create API Server client for Events: %v", err)
}

// make a separate client for heartbeat with throttling disabled and a timeout attached
heartbeatClientConfig := *clientConfig
heartbeatClientConfig.Timeout = s.KubeletConfiguration.NodeStatusUpdateFrequency.Duration
heartbeatClientConfig.QPS = float32(-1)
heartbeatClient, err = v1core.NewForConfig(&heartbeatClientConfig)
if err != nil {
glog.Warningf("Failed to create API Server client for heartbeat: %v", err)
}

kubeDeps.KubeClient = kubeClient
Expand Down Expand Up @@ -658,19 +648,15 @@ func InitializeTLS(kf *options.KubeletFlags, kc *kubeletconfiginternal.KubeletCo

func kubeconfigClientConfig(s *options.KubeletServer) (*restclient.Config, error) {
return clientcmd.NewNonInteractiveDeferredLoadingClientConfig(
&clientcmd.ClientConfigLoadingRules{ExplicitPath: s.KubeConfig.Value()},
&clientcmd.ClientConfigLoadingRules{ExplicitPath: s.KubeConfig},
&clientcmd.ConfigOverrides{},
).ClientConfig()
}

// createClientConfig creates a client configuration from the command line arguments.
// If --kubeconfig is explicitly set, it will be used. If it is not set but
// --require-kubeconfig=true, we attempt to load the default kubeconfig file.
// If --kubeconfig is explicitly set, it will be used.
func createClientConfig(s *options.KubeletServer) (*restclient.Config, error) {
// If --kubeconfig was not provided, it will have a default path set in cmd/kubelet/app/options/options.go.
// We only use that default path when --require-kubeconfig=true. The default path is temporary until --require-kubeconfig is removed.
// TODO(#41161:v1.10.0): Remove the default kubeconfig path and --require-kubeconfig.
if s.BootstrapKubeconfig != "" || s.KubeConfig.Provided() || s.RequireKubeConfig == true {
if s.BootstrapKubeconfig != "" || len(s.KubeConfig) > 0 {
return kubeconfigClientConfig(s)
} else {
return nil, fmt.Errorf("createClientConfig called in standalone mode")
Expand Down

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