-
Notifications
You must be signed in to change notification settings - Fork 2.7k
/
k8s_pod_controller.go
95 lines (83 loc) · 2.95 KB
/
k8s_pod_controller.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
// Copyright 2016-2019 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"
"github.com/cilium/cilium/pkg/controller"
"github.com/cilium/cilium/pkg/k8s"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
const (
minimalPodRestartInterval = 5 * time.Minute
)
var (
unmanagedKubeDnsWatcherInterval int
unmanagedKubeDnsMinimalAge = 30 * time.Second
lastPodRestart = map[string]time.Time{}
)
func enableUnmanagedKubeDNSController() {
controller.NewManager().UpdateController("restart-unmanaged-kube-dns",
controller.ControllerParams{
RunInterval: time.Duration(unmanagedKubeDnsWatcherInterval) * time.Second,
DoFunc: func(ctx context.Context) error {
for podName, lastRestart := range lastPodRestart {
if time.Since(lastRestart) > 2*minimalPodRestartInterval {
delete(lastPodRestart, podName)
}
}
pods, err := k8s.Client().CoreV1().Pods("").List(metav1.ListOptions{
LabelSelector: "k8s-app=kube-dns",
FieldSelector: "status.phase=Running",
})
if err != nil {
return err
}
for _, pod := range pods.Items {
if pod.Spec.HostNetwork {
continue
}
cep, err := ciliumK8sClient.CiliumV2().CiliumEndpoints(pod.Namespace).Get(pod.Name, metav1.GetOptions{})
podID := fmt.Sprintf("%s/%s", pod.Namespace, pod.Name)
switch {
case err == nil:
log.Debugf("Found kube-dns pod %s with identity %d", podID, cep.Status.ID)
case errors.IsNotFound(err):
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(pod.Name, &metav1.DeleteOptions{}); err != nil {
log.WithError(err).Warningf("Unable to restart pod %s", podID)
} else {
lastPodRestart[podID] = time.Now()
}
}
}
default:
return err
}
}
return nil
},
})
}