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drain.go
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drain.go
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package utils
import (
"context"
"os"
"strconv"
"time"
metrics "github.com/cnwizards/node-wizard/pkg/metrics"
log "github.com/sirupsen/logrus"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/kubectl/pkg/drain"
)
type Node struct {
Info *corev1.Node
}
var (
IgnoreAllDaemonSets, _ = strconv.ParseBool(os.Getenv("IGNORE_ALL_DAEMONSETS"))
DeleteEmptyDirData, _ = strconv.ParseBool(os.Getenv("DELETE_EMPTY_DIR_DATA"))
ForceDeletePods, _ = strconv.ParseBool(os.Getenv("FORCE_DELETE_PODS"))
)
func (n Node) DrainNode() error {
helper := BuildDrainHelper()
log.Debugf("Drain helper: %+v", helper)
node := corev1.Node{ObjectMeta: metav1.ObjectMeta{Name: n.Info.Name}}
log.Debugf("Node: %+v", node)
err := drain.RunCordonOrUncordon(helper, &node, true)
if err != nil {
log.Errorf("Error cordoning node %s: %v", node.Name, err)
return err
}
log.Infof("Node %s cordoned", node.Name)
err = drain.RunNodeDrain(helper, node.Name)
if err != nil {
log.Errorf("Error draining node %s: %v", node.Name, err)
return err
}
log.Infof("Node %s drained", node.Name)
metrics.IncrementDrainCounter(node.Name)
return nil
}
func (n Node) UncordonNode() error {
clientset, err := GetKubernetesClient()
if err != nil {
return err
}
n.Info.Spec.Unschedulable = false
_, err = clientset.CoreV1().Nodes().Update(context.TODO(), n.Info, metav1.UpdateOptions{})
if err != nil {
log.Errorf("Error uncordoning node %s: %v", n.Info.Name, err)
return err
}
metrics.IncrementUncordonCounter(n.Info.Name)
return nil
}
func BuildDrainHelper() *drain.Helper {
clientset, err := GetKubernetesClient()
if err != nil {
panic(err.Error())
}
return &drain.Helper{
Ctx: context.Background(),
Client: clientset,
Force: ForceDeletePods,
GracePeriodSeconds: 0,
IgnoreAllDaemonSets: IgnoreAllDaemonSets,
DeleteEmptyDirData: DeleteEmptyDirData,
Timeout: 100 * time.Second,
Out: log.StandardLogger().Writer(),
ErrOut: log.StandardLogger().Writer(),
}
}