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[Kube-scheduler] Lower timeout for leaderelection resourcelock

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Migrate how resource lock and leader election config is generated to new
way, hidding kubeClient. This also halfs kubeClient timeout, making it
an useful value.
This commit is contained in:
Jakub Przychodzeń 2021-01-12 11:06:24 +01:00
parent 9caf675ed1
commit 93cf797c50
1 changed files with 24 additions and 21 deletions
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45
cmd/kube-scheduler/app/options/options.go
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@ -266,8 +266,14 @@ func (o *Options) Config() (*schedulerappconfig.Config, error) {
return nil, err
}
// Prepare kube config.
kubeConfig, err := createKubeConfig(c.ComponentConfig.ClientConnection, o.Master)
if err != nil {
return nil, err
}
// Prepare kube clients.
client, leaderElectionClient, eventClient, err := createClients(c.ComponentConfig.ClientConnection, o.Master, c.ComponentConfig.LeaderElection.RenewDeadline.Duration)
client, eventClient, err := createClients(kubeConfig)
if err != nil {
return nil, err
}
@ -279,7 +285,7 @@ func (o *Options) Config() (*schedulerappconfig.Config, error) {
if c.ComponentConfig.LeaderElection.LeaderElect {
// Use the scheduler name in the first profile to record leader election.
coreRecorder := c.EventBroadcaster.DeprecatedNewLegacyRecorder(c.ComponentConfig.Profiles[0].SchedulerName)
leaderElectionConfig, err = makeLeaderElectionConfig(c.ComponentConfig.LeaderElection, leaderElectionClient, coreRecorder)
leaderElectionConfig, err = makeLeaderElectionConfig(c.ComponentConfig.LeaderElection, kubeConfig, coreRecorder)
if err != nil {
return nil, err
}
@ -294,7 +300,7 @@ func (o *Options) Config() (*schedulerappconfig.Config, error) {
// makeLeaderElectionConfig builds a leader election configuration. It will
// create a new resource lock associated with the configuration.
func makeLeaderElectionConfig(config componentbaseconfig.LeaderElectionConfiguration, client clientset.Interface, recorder record.EventRecorder) (*leaderelection.LeaderElectionConfig, error) {
func makeLeaderElectionConfig(config componentbaseconfig.LeaderElectionConfiguration, kubeConfig *restclient.Config, recorder record.EventRecorder) (*leaderelection.LeaderElectionConfig, error) {
hostname, err := os.Hostname()
if err != nil {
return nil, fmt.Errorf("unable to get hostname: %v", err)
@ -302,15 +308,15 @@ func makeLeaderElectionConfig(config componentbaseconfig.LeaderElectionConfigura
// add a uniquifier so that two processes on the same host don't accidentally both become active
id := hostname + "_" + string(uuid.NewUUID())
rl, err := resourcelock.New(config.ResourceLock,
rl, err := resourcelock.NewFromKubeconfig(config.ResourceLock,
config.ResourceNamespace,
config.ResourceName,
client.CoreV1(),
client.CoordinationV1(),
resourcelock.ResourceLockConfig{
Identity: id,
EventRecorder: recorder,
})
},
kubeConfig,
config.RenewDeadline.Duration)
if err != nil {
return nil, fmt.Errorf("couldn't create resource lock: %v", err)
}
@ -325,9 +331,9 @@ func makeLeaderElectionConfig(config componentbaseconfig.LeaderElectionConfigura
}, nil
}
// createClients creates a kube client and an event client from the given config and masterOverride.
// createKubeConfig creates a kubeConfig from the given config and masterOverride.
// TODO remove masterOverride when CLI flags are removed.
func createClients(config componentbaseconfig.ClientConnectionConfiguration, masterOverride string, timeout time.Duration) (clientset.Interface, clientset.Interface, clientset.Interface, error) {
func createKubeConfig(config componentbaseconfig.ClientConnectionConfiguration, masterOverride string) (*restclient.Config, error) {
if len(config.Kubeconfig) == 0 && len(masterOverride) == 0 {
klog.Warningf("Neither --kubeconfig nor --master was specified. Using default API client. This might not work.")
}
@ -338,7 +344,7 @@ func createClients(config componentbaseconfig.ClientConnectionConfiguration, mas
&clientcmd.ClientConfigLoadingRules{ExplicitPath: config.Kubeconfig},
&clientcmd.ConfigOverrides{ClusterInfo: clientcmdapi.Cluster{Server: masterOverride}}).ClientConfig()
if err != nil {
return nil, nil, nil, err
return nil, err
}
kubeConfig.DisableCompression = true
@ -347,23 +353,20 @@ func createClients(config componentbaseconfig.ClientConnectionConfiguration, mas
kubeConfig.QPS = config.QPS
kubeConfig.Burst = int(config.Burst)
return kubeConfig, nil
}
// createClients creates a kube client and an event client from the given kubeConfig
func createClients(kubeConfig *restclient.Config) (clientset.Interface, clientset.Interface, error) {
client, err := clientset.NewForConfig(restclient.AddUserAgent(kubeConfig, "scheduler"))
if err != nil {
return nil, nil, nil, err
}
// shallow copy, do not modify the kubeConfig.Timeout.
restConfig := *kubeConfig
restConfig.Timeout = timeout
leaderElectionClient, err := clientset.NewForConfig(restclient.AddUserAgent(&restConfig, "leader-election"))
if err != nil {
return nil, nil, nil, err
return nil, nil, err
}
eventClient, err := clientset.NewForConfig(kubeConfig)
if err != nil {
return nil, nil, nil, err
return nil, nil, err
}
return client, leaderElectionClient, eventClient, nil
return client, eventClient, nil
}