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k8s_pod_controller.go
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k8s_pod_controller.go
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// Copyright 2016-2020 Authors of Cilium
//
// 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 main
import (
"context"
"fmt"
"time"
operatorOption "github.com/cilium/cilium/operator/option"
"github.com/cilium/cilium/operator/watchers"
"github.com/cilium/cilium/pkg/controller"
"github.com/cilium/cilium/pkg/k8s"
slim_corev1 "github.com/cilium/cilium/pkg/k8s/slim/k8s/apis/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/wait"
)
const (
minimalPodRestartInterval = 5 * time.Minute
unmanagedKubeDnsMinimalAge = 30 * time.Second
)
var (
lastPodRestart = map[string]time.Time{}
)
func enableUnmanagedKubeDNSController() {
// These functions will block until the resources are synced with k8s.
watchers.CiliumEndpointsInit(k8s.CiliumClient().CiliumV2(), wait.NeverStop)
watchers.UnmanagedPodsInit(k8s.WatcherCli())
controller.NewManager().UpdateController("restart-unmanaged-kube-dns",
controller.ControllerParams{
RunInterval: time.Duration(operatorOption.Config.UnmanagedPodWatcherInterval) * time.Second,
DoFunc: func(ctx context.Context) error {
for podName, lastRestart := range lastPodRestart {
if time.Since(lastRestart) > 2*minimalPodRestartInterval {
delete(lastPodRestart, podName)
}
}
for _, podItem := range watchers.UnmanagedPodStore.List() {
pod, ok := podItem.(*slim_corev1.Pod)
if !ok {
log.Errorf("unexpected type mapping: found %T, expected %T", pod, &slim_corev1.Pod{})
continue
}
if pod.Spec.HostNetwork {
continue
}
cep, exists, err := watchers.HasCE(pod.Namespace, pod.Name)
if err != nil {
log.WithError(err).Errorf("unexpected error when getting CiliumEndpoint %s/%s", pod.Namespace, pod.Name)
continue
}
podID := fmt.Sprintf("%s/%s", pod.Namespace, pod.Name)
if exists {
log.Debugf("Found kube-dns pod %s with identity %d", podID, cep.Status.ID)
} else {
log.Debugf("Found unmanaged kube-dns pod %s", podID)
if startTime := pod.Status.StartTime; startTime != nil {
if age := time.Since((*startTime).Time); age > unmanagedKubeDnsMinimalAge {
if lastRestart, ok := lastPodRestart[podID]; ok {
if timeSinceRestart := time.Since(lastRestart); timeSinceRestart < minimalPodRestartInterval {
log.Debugf("Not restaring %s, only %s since last restart", podID, timeSinceRestart)
continue
}
}
log.Infof("Restarting unmanaged kube-dns pod %s started %s ago", podID, age)
if err := k8s.Client().CoreV1().Pods(pod.Namespace).Delete(ctx, pod.Name, metav1.DeleteOptions{}); err != nil {
log.WithError(err).Warningf("Unable to restart pod %s", podID)
} else {
lastPodRestart[podID] = time.Now()
// Delete a single pod per iteration to avoid killing all replicas at once
return nil
}
}
}
}
}
return nil
},
})
}