mirror of https://github.com/k3s-io/k3s
75 lines
2.1 KiB
Go
75 lines
2.1 KiB
Go
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/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package kubelet
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import (
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"github.com/google/cadvisor/events"
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cadvisorapi "github.com/google/cadvisor/info/v1"
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"k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/util/runtime"
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"k8s.io/client-go/tools/record"
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"k8s.io/klog"
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"k8s.io/kubernetes/pkg/kubelet/cadvisor"
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)
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// OOMWatcher defines the interface of OOM watchers.
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type OOMWatcher interface {
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Start(ref *v1.ObjectReference) error
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}
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type realOOMWatcher struct {
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cadvisor cadvisor.Interface
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recorder record.EventRecorder
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}
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// NewOOMWatcher creates and initializes a OOMWatcher based on parameters.
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func NewOOMWatcher(cadvisor cadvisor.Interface, recorder record.EventRecorder) OOMWatcher {
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return &realOOMWatcher{
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cadvisor: cadvisor,
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recorder: recorder,
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}
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}
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const systemOOMEvent = "SystemOOM"
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// Watches cadvisor for system oom's and records an event for every system oom encountered.
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func (ow *realOOMWatcher) Start(ref *v1.ObjectReference) error {
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request := events.Request{
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EventType: map[cadvisorapi.EventType]bool{
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cadvisorapi.EventOom: true,
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},
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ContainerName: "/",
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IncludeSubcontainers: false,
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}
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eventChannel, err := ow.cadvisor.WatchEvents(&request)
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if err != nil {
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return err
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}
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go func() {
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defer runtime.HandleCrash()
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for event := range eventChannel.GetChannel() {
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klog.V(2).Infof("Got sys oom event from cadvisor: %v", event)
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ow.recorder.PastEventf(ref, metav1.Time{Time: event.Timestamp}, v1.EventTypeWarning, systemOOMEvent, "System OOM encountered")
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}
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klog.Errorf("Unexpectedly stopped receiving OOM notifications from cAdvisor")
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}()
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return nil
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}
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