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nodelifecyclecontroller.go
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nodelifecyclecontroller.go
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/*
Copyright 2018 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package options
import (
"github.com/spf13/pflag"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/kubernetes/pkg/apis/componentconfig"
)
// NodeLifecycleControllerOptions holds the NodeLifecycleController options.
type NodeLifecycleControllerOptions struct {
EnableTaintManager bool
NodeEvictionRate float32
SecondaryNodeEvictionRate float32
NodeStartupGracePeriod metav1.Duration
NodeMonitorGracePeriod metav1.Duration
PodEvictionTimeout metav1.Duration
LargeClusterSizeThreshold int32
UnhealthyZoneThreshold float32
}
// AddFlags adds flags related to NodeLifecycleController for controller manager to the specified FlagSet.
func (o *NodeLifecycleControllerOptions) AddFlags(fs *pflag.FlagSet) {
if o == nil {
return
}
fs.DurationVar(&o.NodeStartupGracePeriod.Duration, "node-startup-grace-period", o.NodeStartupGracePeriod.Duration,
"Amount of time which we allow starting Node to be unresponsive before marking it unhealthy.")
fs.DurationVar(&o.NodeMonitorGracePeriod.Duration, "node-monitor-grace-period", o.NodeMonitorGracePeriod.Duration,
"Amount of time which we allow running Node to be unresponsive before marking it unhealthy. "+
"Must be N times more than kubelet's nodeStatusUpdateFrequency, "+
"where N means number of retries allowed for kubelet to post node status.")
fs.DurationVar(&o.PodEvictionTimeout.Duration, "pod-eviction-timeout", o.PodEvictionTimeout.Duration, "The grace period for deleting pods on failed nodes.")
fs.Float32Var(&o.NodeEvictionRate, "node-eviction-rate", 0.1, "Number of nodes per second on which pods are deleted in case of node failure when a zone is healthy (see --unhealthy-zone-threshold for definition of healthy/unhealthy). Zone refers to entire cluster in non-multizone clusters.")
fs.Float32Var(&o.SecondaryNodeEvictionRate, "secondary-node-eviction-rate", 0.01, "Number of nodes per second on which pods are deleted in case of node failure when a zone is unhealthy (see --unhealthy-zone-threshold for definition of healthy/unhealthy). Zone refers to entire cluster in non-multizone clusters. This value is implicitly overridden to 0 if the cluster size is smaller than --large-cluster-size-threshold.")
fs.Int32Var(&o.LargeClusterSizeThreshold, "large-cluster-size-threshold", 50, "Number of nodes from which NodeController treats the cluster as large for the eviction logic purposes. --secondary-node-eviction-rate is implicitly overridden to 0 for clusters this size or smaller.")
fs.Float32Var(&o.UnhealthyZoneThreshold, "unhealthy-zone-threshold", 0.55, "Fraction of Nodes in a zone which needs to be not Ready (minimum 3) for zone to be treated as unhealthy. ")
fs.BoolVar(&o.EnableTaintManager, "enable-taint-manager", o.EnableTaintManager, "WARNING: Beta feature. If set to true enables NoExecute Taints and will evict all not-tolerating Pod running on Nodes tainted with this kind of Taints.")
}
// ApplyTo fills up NodeLifecycleController config with options.
func (o *NodeLifecycleControllerOptions) ApplyTo(cfg *componentconfig.NodeLifecycleControllerConfiguration) error {
if o == nil {
return nil
}
cfg.EnableTaintManager = o.EnableTaintManager
cfg.NodeStartupGracePeriod = o.NodeStartupGracePeriod
cfg.NodeMonitorGracePeriod = o.NodeMonitorGracePeriod
cfg.PodEvictionTimeout = o.PodEvictionTimeout
cfg.NodeEvictionRate = o.NodeEvictionRate
cfg.SecondaryNodeEvictionRate = o.SecondaryNodeEvictionRate
cfg.LargeClusterSizeThreshold = o.LargeClusterSizeThreshold
cfg.UnhealthyZoneThreshold = o.UnhealthyZoneThreshold
return nil
}
// Validate checks validation of NodeLifecycleControllerOptions.
func (o *NodeLifecycleControllerOptions) Validate() []error {
if o == nil {
return nil
}
errs := []error{}
return errs
}