/
drain.go
135 lines (116 loc) · 3.15 KB
/
drain.go
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package kubeclient
import (
"context"
"time"
v1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
kerrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/client-go/util/retry"
"github.com/openshift/openshift-azure/pkg/util/wait"
)
func (u *Kubeclientset) DrainAndDeleteWorker(ctx context.Context, hostname string) error {
err := u.setUnschedulable(hostname, true)
switch {
case err == nil:
case kerrors.IsNotFound(err):
u.Log.Info("drain: node not found, skipping")
return nil
default:
return err
}
err = u.deletePods(ctx, hostname)
if err != nil {
return err
}
return u.Client.CoreV1().Nodes().Delete(hostname, &metav1.DeleteOptions{})
}
func (u *Kubeclientset) DeleteMaster(hostname string) error {
err := u.Client.CoreV1().Nodes().Delete(hostname, &metav1.DeleteOptions{})
if kerrors.IsNotFound(err) {
err = nil
}
return err
}
func (u *Kubeclientset) setUnschedulable(hostname string, unschedulable bool) error {
return retry.RetryOnConflict(retry.DefaultRetry, func() error {
node, err := u.Client.CoreV1().Nodes().Get(hostname, metav1.GetOptions{})
if err != nil {
return err
}
node.Spec.Unschedulable = unschedulable
_, err = u.Client.CoreV1().Nodes().Update(node)
return err
})
}
func getControllerRef(pod *v1.Pod) *metav1.OwnerReference {
for _, ref := range pod.OwnerReferences {
if ref.Controller != nil && *ref.Controller {
return &ref
}
}
return nil
}
func max(i, j time.Duration) time.Duration {
if i > j {
return i
}
return j
}
func (u *Kubeclientset) deletePods(ctx context.Context, hostname string) error {
podList, err := u.Client.CoreV1().Pods(metav1.NamespaceAll).List(metav1.ListOptions{
FieldSelector: fields.SelectorFromSet(fields.Set{"spec.nodeName": hostname}).String(),
})
if err != nil {
return err
}
pods := map[*v1.Pod]struct{}{}
duration := time.Duration(0)
for i, pod := range podList.Items {
if _, isMirror := pod.Annotations[v1.MirrorPodAnnotationKey]; isMirror {
continue
}
controllerRef := getControllerRef(&pod)
if controllerRef != nil && controllerRef.Kind == "DaemonSet" {
continue
}
err = u.Client.CoreV1().Pods(pod.Namespace).Delete(pod.Name, &metav1.DeleteOptions{})
switch {
case err == nil:
d := 30 * time.Second
if pod.Spec.TerminationGracePeriodSeconds != nil {
d = 3 * time.Duration(*pod.Spec.TerminationGracePeriodSeconds+2) * time.Second
}
duration = max(duration, d)
case apierrors.IsNotFound(err):
default:
// TODO: handle 429
return err
}
pods[&podList.Items[i]] = struct{}{}
}
t := time.NewTimer(duration)
defer t.Stop()
return wait.PollImmediateUntil(time.Second, func() (bool, error) {
for pod := range pods {
p, err := u.Client.CoreV1().Pods(pod.Namespace).Get(pod.Name, metav1.GetOptions{})
switch {
case apierrors.IsNotFound(err) || (p != nil && p.ObjectMeta.UID != pod.ObjectMeta.UID):
delete(pods, pod)
case err == nil:
default:
return false, err
}
}
if len(pods) == 0 {
return true, nil
}
select {
case <-t.C:
return true, nil
default:
return false, nil
}
}, ctx.Done())
}