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handle_draining.go
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handle_draining.go
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/*
Copyright 2021 Flant JSC
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 hooks
import (
"context"
"io"
"sync"
"time"
"github.com/flant/addon-operator/pkg/module_manager/go_hook"
"github.com/flant/addon-operator/sdk"
"github.com/flant/shell-operator/pkg/kube/object_patch"
"github.com/sirupsen/logrus"
corev1 "k8s.io/api/core/v1"
eventsv1 "k8s.io/api/events/v1"
v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/types"
"k8s.io/utils/pointer"
"github.com/deckhouse/deckhouse/go_lib/dependency"
"github.com/deckhouse/deckhouse/go_lib/dependency/k8s/drain"
)
const (
drainingAnnotationKey = "update.node.deckhouse.io/draining"
drainedAnnotationKey = "update.node.deckhouse.io/drained"
)
var _ = sdk.RegisterFunc(&go_hook.HookConfig{
Queue: "/modules/node-manager/draining",
Kubernetes: []go_hook.KubernetesConfig{
{
Name: "nodes_for_draining",
WaitForSynchronization: pointer.Bool(true),
ExecuteHookOnSynchronization: pointer.Bool(true),
ExecuteHookOnEvents: pointer.Bool(true),
ApiVersion: "v1",
Kind: "Node",
LabelSelector: &v1.LabelSelector{
MatchExpressions: []v1.LabelSelectorRequirement{
{
Key: "node.deckhouse.io/group",
Operator: v1.LabelSelectorOpExists,
},
},
},
FilterFunc: drainFilter,
},
},
Settings: &go_hook.HookConfigSettings{
ExecutionMinInterval: 30 * time.Second,
},
}, dependency.WithExternalDependencies(handleDraining))
func drainFilter(obj *unstructured.Unstructured) (go_hook.FilterResult, error) {
var node corev1.Node
err := sdk.FromUnstructured(obj, &node)
if err != nil {
return nil, err
}
var (
drainingSource string
drainedSource string
)
if source, ok := node.Annotations[drainingAnnotationKey]; ok {
// keep backward compatibility
if source == "" {
drainingSource = "bashible"
} else {
drainingSource = source
}
}
if source, ok := node.Annotations[drainedAnnotationKey]; ok {
// keep backward compatibility
if source == "" {
drainedSource = "bashible"
} else {
drainedSource = source
}
}
return drainingNode{
Name: node.Name,
DrainingSource: drainingSource,
DrainedSource: drainedSource,
Unschedulable: node.Spec.Unschedulable,
}, nil
}
// Drain nodes: If node is marked for draining – drain it!
// all nodes in one node group drain concurrently. If we need to limit this behavior - put here some queue implementation
func handleDraining(input *go_hook.HookInput, dc dependency.Container) error {
k8sCli, err := dc.GetK8sClient()
if err != nil {
return err
}
errOut := input.LogEntry.WriterLevel(logrus.WarnLevel)
defer func(errOut *io.PipeWriter) {
err := errOut.Close()
if err != nil {
input.LogEntry.Warningf("error closing logrus PipeWriter: %s", err)
}
}(errOut)
drainHelper := drain.NewDrainer(k8sCli, errOut)
drainHelper.Ctx = context.Background()
var wg = &sync.WaitGroup{}
drainingNodesC := make(chan drainedNodeRes, 1)
snap := input.Snapshots["nodes_for_draining"]
for _, s := range snap {
dNode := s.(drainingNode)
if !dNode.isDraining() {
// If the node became schedulable, but 'drained' annotation is still on it, remove the obsolete annotation
if !dNode.Unschedulable && dNode.DrainedSource == "user" {
input.PatchCollector.MergePatch(removeDrainedAnnotation, "v1", "Node", "", dNode.Name)
}
continue
}
// If the node is marked for draining while is has been drained, remove the 'drained' annotation
if dNode.DrainedSource == "user" {
input.PatchCollector.MergePatch(removeDrainedAnnotation, "v1", "Node", "", dNode.Name)
}
cordonNode := &corev1.Node{
TypeMeta: v1.TypeMeta{
Kind: "Node",
APIVersion: "v1",
},
ObjectMeta: v1.ObjectMeta{
Name: dNode.Name,
},
Spec: corev1.NodeSpec{Unschedulable: dNode.Unschedulable},
}
err := drain.RunCordonOrUncordon(drainHelper, cordonNode, true)
if err != nil {
input.LogEntry.Errorf("Cordon node '%s' failed: %s", dNode.Name, err)
continue
}
wg.Add(1)
go func(node drainingNode) {
err = drain.RunNodeDrain(drainHelper, node.Name)
drainingNodesC <- drainedNodeRes{
NodeName: node.Name,
DrainingSource: node.DrainingSource,
Err: err,
}
wg.Done()
}(dNode)
}
go func() {
wg.Wait()
close(drainingNodesC)
}()
for drainedNode := range drainingNodesC {
if drainedNode.Err != nil {
input.LogEntry.Errorf("node %q drain failed: %s", drainedNode.NodeName, drainedNode.Err)
event := drainedNode.buildEvent()
input.PatchCollector.Create(event, object_patch.UpdateIfExists())
continue
}
input.PatchCollector.MergePatch(newDrainedAnnotationPatch(drainedNode.DrainingSource), "v1", "Node", "", drainedNode.NodeName)
}
return nil
}
func newDrainedAnnotationPatch(source string) map[string]interface{} {
return map[string]interface{}{
"metadata": map[string]interface{}{
"annotations": map[string]interface{}{
drainingAnnotationKey: nil,
drainedAnnotationKey: source,
},
},
}
}
var (
removeDrainedAnnotation = map[string]interface{}{
"metadata": map[string]interface{}{
"annotations": map[string]interface{}{
drainedAnnotationKey: nil,
},
},
}
)
type drainingNode struct {
Name string
DrainingSource string
DrainedSource string
Unschedulable bool
}
func (dn drainingNode) isDraining() bool {
return dn.DrainingSource != ""
}
func (dn drainingNode) isDrained() bool {
return dn.DrainedSource != ""
}
type drainedNodeRes struct {
NodeName string
DrainingSource string
Err error
}
func (dr drainedNodeRes) buildEvent() *eventsv1.Event {
return &eventsv1.Event{
TypeMeta: v1.TypeMeta{
Kind: "Event",
APIVersion: "events.k8s.io/v1",
},
ObjectMeta: v1.ObjectMeta{
// Namespace field has to be filled - event will not be created without it
// and we have to set 'default' value here for linking this event with a Node object, which is global
Namespace: "default",
GenerateName: "node-" + dr.NodeName + "-",
},
Regarding: corev1.ObjectReference{
Kind: "Node",
Name: dr.NodeName,
// nodeName is used for both .name and .uid fields intentionally as putting a real node uid
// has proven to have some side effects like missing events when describing objects using kubectl versions 1.23.x
UID: types.UID(dr.NodeName),
APIVersion: "deckhouse.io/v1",
},
Reason: "DrainFailed",
Note: dr.Err.Error(),
Type: "Warning",
EventTime: v1.MicroTime{Time: time.Now()},
Action: "Binding",
ReportingInstance: "deckhouse",
ReportingController: "deckhouse",
}
}