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Kubernetes Pod因CrashLoopBackOff失败

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我正在关注this guide以便使用minikube设置一个pod并从托管在以下位置的私有存储库中提取图像：hub.docker.com

当试图设置一个pod来拉动图像时，我看到“CrashLoopBackoff”

pod config:

apiVersion: v1
kind: Pod
metadata:
  name: private-reg
spec:
  containers:
    - name: private-reg-container
      image: ha/prod:latest
  imagePullSecrets:
    - name: regsecret

output of "get pod"

kubectl get pod private-reg
NAME          READY     STATUS             RESTARTS   AGE
private-reg   0/1       CrashLoopBackOff   5          4m

据我所知，图像没有问题，如果我手动拉它们并运行它们，它们就可以工作了 .

（你可以看到“成功拉图片”ha / prod：latest“）

如果我将一般图像推送到诸如centos的存储库并尝试使用pod拉动并运行它，也会发生此问题 .

此外，秘密似乎工作正常，我可以看到私人存储库中的“拉”计数 .

这是命令的输出：

kubectl描述pods private-reg：

[~]$ kubectl describe pods private-reg
Name:       private-reg
Namespace:  default
Node:       minikube/192.168.99.100
Start Time: Thu, 22 Jun 2017 17:13:24 +0300
Labels:     <none>
Annotations:    <none>
Status:     Running
IP:     172.17.0.5
Controllers:    <none>
Containers:
  private-reg-container:
    Container ID:   docker://1aad64750d0ba9ba826fe4f12c8814f7db77293078f8047feec686fcd8f90132
    Image:      ha/prod:latest
    Image ID:       docker://sha256:7335859e2071af518bcd0e2f373f57c1da643bb37c7e6bbc125d171ff98f71c0
    Port:       
    State:      Waiting
      Reason:       CrashLoopBackOff
    Last State:     Terminated
      Reason:       Completed
      Exit Code:    0
      Started:      Mon, 01 Jan 0001 00:00:00 +0000
      Finished:     Thu, 22 Jun 2017 17:20:04 +0300
    Ready:      False
    Restart Count:  6
    Environment:    <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-bhvgz (ro)
Conditions:
  Type      Status
  Initialized   True 
  Ready     False 
  PodScheduled  True 
Volumes:
  default-token-bhvgz:
    Type:   Secret (a volume populated by a Secret)
    SecretName: default-token-bhvgz
    Optional:   false
QoS Class:  BestEffort
Node-Selectors: <none>
Tolerations:    <none>
Events:
  FirstSeen LastSeen    Count   From            SubObjectPath               Type        Reason      Message
  --------- --------    -----   ----            -------------               --------    ------      -------
  9m        9m      1   default-scheduler                       Normal      Scheduled   Successfully assigned private-reg to minikube
  8m        8m      1   kubelet, minikube   spec.containers{private-reg-container}  Normal      Created     Created container with id 431fecfd1d2ca03d29fd88fd6c663e66afb59dc5e86487409002dd8e9987945c
  8m        8m      1   kubelet, minikube   spec.containers{private-reg-container}  Normal      Started     Started container with id 431fecfd1d2ca03d29fd88fd6c663e66afb59dc5e86487409002dd8e9987945c
  8m        8m      1   kubelet, minikube   spec.containers{private-reg-container}  Normal      Started     Started container with id 223e6af99bb950570a27056d7401137ff9f3dc895f4f313a36e73ef6489eb61a
  8m        8m      1   kubelet, minikube   spec.containers{private-reg-container}  Normal      Created     Created container with id 223e6af99bb950570a27056d7401137ff9f3dc895f4f313a36e73ef6489eb61a
  8m        8m      2   kubelet, minikube                       Warning     FailedSync  Error syncing pod, skipping: failed to "StartContainer" for "private-reg-container" with CrashLoopBackOff: "Back-off 10s restarting failed container=private-reg-container pod=private-reg_default(f4340638-5754-11e7-978a-08002773375c)"

  8m    8m  1   kubelet, minikube   spec.containers{private-reg-container}  Normal  Started     Started container with id a98377f9aedc5947fe1dd006caddb11fb48fa2fd0bb06c20667e0c8b83a3ab6a
  8m    8m  1   kubelet, minikube   spec.containers{private-reg-container}  Normal  Created     Created container with id a98377f9aedc5947fe1dd006caddb11fb48fa2fd0bb06c20667e0c8b83a3ab6a
  8m    8m  2   kubelet, minikube                       Warning FailedSync  Error syncing pod, skipping: failed to "StartContainer" for "private-reg-container" with CrashLoopBackOff: "Back-off 20s restarting failed container=private-reg-container pod=private-reg_default(f4340638-5754-11e7-978a-08002773375c)"

  8m    8m  1   kubelet, minikube   spec.containers{private-reg-container}  Normal  Started     Started container with id 261f430a80ff5a312bdbdee78558091a9ae7bc9fc6a9e0676207922f1a576841
  8m    8m  1   kubelet, minikube   spec.containers{private-reg-container}  Normal  Created     Created container with id 261f430a80ff5a312bdbdee78558091a9ae7bc9fc6a9e0676207922f1a576841
  8m    7m  3   kubelet, minikube                       Warning FailedSync  Error syncing pod, skipping: failed to "StartContainer" for "private-reg-container" with CrashLoopBackOff: "Back-off 40s restarting failed container=private-reg-container pod=private-reg_default(f4340638-5754-11e7-978a-08002773375c)"

  7m    7m  1   kubelet, minikube   spec.containers{private-reg-container}  Normal  Created     Created container with id 7251ab76853d4178eff59c10bb41e52b2b1939fbee26e546cd564e2f6b4a1478
  7m    7m  1   kubelet, minikube   spec.containers{private-reg-container}  Normal  Started     Started container with id 7251ab76853d4178eff59c10bb41e52b2b1939fbee26e546cd564e2f6b4a1478
  7m    5m  7   kubelet, minikube                       Warning FailedSync  Error syncing pod, skipping: failed to "StartContainer" for "private-reg-container" with CrashLoopBackOff: "Back-off 1m20s restarting failed container=private-reg-container pod=private-reg_default(f4340638-5754-11e7-978a-08002773375c)"

  5m    5m  1   kubelet, minikube   spec.containers{private-reg-container}  Normal  Created     Created container with id 347868d03fc9730417cf234e4c96195bb9b45a6cc9d9d97973855801d52e2a02
  5m    5m  1   kubelet, minikube   spec.containers{private-reg-container}  Normal  Started     Started container with id 347868d03fc9730417cf234e4c96195bb9b45a6cc9d9d97973855801d52e2a02
  5m    3m  12  kubelet, minikube                       Warning FailedSync  Error syncing pod, skipping: failed to "StartContainer" for "private-reg-container" with CrashLoopBackOff: "Back-off 2m40s restarting failed container=private-reg-container pod=private-reg_default(f4340638-5754-11e7-978a-08002773375c)"

  9m    2m      7   kubelet, minikube   spec.containers{private-reg-container}  Normal  Pulling     pulling image "ha/prod:latest"
  2m    2m      1   kubelet, minikube   spec.containers{private-reg-container}  Normal  Started     Started container with id 1aad64750d0ba9ba826fe4f12c8814f7db77293078f8047feec686fcd8f90132
  8m    2m      7   kubelet, minikube   spec.containers{private-reg-container}  Normal  Pulled      Successfully pulled image "ha/prod:latest"
  2m    2m      1   kubelet, minikube   spec.containers{private-reg-container}  Normal  Created     Created container with id 1aad64750d0ba9ba826fe4f12c8814f7db77293078f8047feec686fcd8f90132
  8m    <invalid>   40  kubelet, minikube   spec.containers{private-reg-container}  Warning BackOff     Back-off restarting failed container
  2m    <invalid>   14  kubelet, minikube                       Warning FailedSync  Error syncing pod, skipping: failed to "StartContainer" for "private-reg-container" with CrashLoopBackOff: "Back-off 5m0s restarting failed container=private-reg-container pod=private-reg_default(f4340638-5754-11e7-978a-08002773375c)"

这是命令的输出：

kubectl --v = 8记录private-reg

I0622 17:35:01.043739   15981 cached_discovery.go:71] returning cached discovery info from /home/demo/.kube/cache/discovery/192.168.99.100_8443/apps/v1beta1/serverresources.json
I0622 17:35:01.043951   15981 cached_discovery.go:71] returning cached discovery info from /home/demo/.kube/cache/discovery/192.168.99.100_8443/v1/serverresources.json
I0622 17:35:01.045061   15981 cached_discovery.go:118] returning cached discovery info from /home/demo/.kube/cache/discovery/192.168.99.100_8443/servergroups.json
I0622 17:35:01.045175   15981 round_trippers.go:395] GET https://192.168.99.100:8443/api/v1/namespaces/default/pods/private-reg
I0622 17:35:01.045182   15981 round_trippers.go:402] Request Headers:
I0622 17:35:01.045187   15981 round_trippers.go:405]     Accept: application/json, */*
I0622 17:35:01.045191   15981 round_trippers.go:405]     User-Agent: kubectl/v1.6.6 (linux/amd64) kubernetes/7fa1c17
I0622 17:35:01.072863   15981 round_trippers.go:420] Response Status: 200 OK in 27 milliseconds
I0622 17:35:01.072900   15981 round_trippers.go:423] Response Headers:
I0622 17:35:01.072921   15981 round_trippers.go:426]     Content-Type: application/json
I0622 17:35:01.072930   15981 round_trippers.go:426]     Content-Length: 2216
I0622 17:35:01.072936   15981 round_trippers.go:426]     Date: Thu, 22 Jun 2017 14:35:31 GMT
I0622 17:35:01.072994   15981 request.go:991] Response Body: {"kind":"Pod","apiVersion":"v1","metadata":{"name":"private-reg","namespace":"default","selfLink":"/api/v1/namespaces/default/pods/private-reg","uid":"f4340638-5754-11e7-978a-08002773375c","resourceVersion":"3070","creationTimestamp":"2017-06-22T14:13:24Z"},"spec":{"volumes":[{"name":"default-token-bhvgz","secret":{"secretName":"default-token-bhvgz","defaultMode":420}}],"containers":[{"name":"private-reg-container","image":"ha/prod:latest","resources":{},"volumeMounts":[{"name":"default-token-bhvgz","readOnly":true,"mountPath":"/var/run/secrets/kubernetes.io/serviceaccount"}],"terminationMessagePath":"/dev/termination-log","terminationMessagePolicy":"File","imagePullPolicy":"Always"}],"restartPolicy":"Always","terminationGracePeriodSeconds":30,"dnsPolicy":"ClusterFirst","serviceAccountName":"default","serviceAccount":"default","nodeName":"minikube","securityContext":{},"imagePullSecrets":[{"name":"regsecret"}],"schedulerName":"default-scheduler"},"status":{"phase":"Running","conditions":[{"type":"Initialized","status":"True","lastProbeTime":null,"lastTransitionTime":"2017-06-22T14:13:24Z"},{"type":"Ready","status":"False","lastProbeTime":null,"lastTransitionTime":"2017-06-22T14:13:24Z","reason":"ContainersNotReady","message":"containers with unready status: [private-reg-container]"},{"type":"PodScheduled","status":"True","lastProbeTime":null,"lastTransitionTime":"2017-06-22T14:13:24Z"}],"hostIP":"192.168.99.100","podIP":"172.17.0.5","startTime":"2017-06-22T14:13:24Z","containerStatuses":[{"name":"private-reg-container","state":{"waiting":{"reason":"CrashLoopBackOff","message":"Back-off 5m0s restarting failed container=private-reg-container pod=private-reg_default(f4340638-5754-11e7-978a-08002773375c)"}},"lastState":{"terminated":{"exitCode":0,"reason":"Completed","startedAt":null,"finishedAt":"2017-06-22T14:30:36Z","containerID":"docker://a4cb436a79b0b21bb385e544d424b2444a80ca66160ef21af30ab69ed2e23b32"}},"ready":false,"restartCount":8,"image":"ha/prod:latest","imageID":"docker://sha256:7335859e2071af518bcd0e2f373f57c1da643bb37c7e6bbc125d171ff98f71c0","containerID":"docker://a4cb436a79b0b21bb385e544d424b2444a80ca66160ef21af30ab69ed2e23b32"}],"qosClass":"BestEffort"}}
I0622 17:35:01.074108   15981 round_trippers.go:395] GET https://192.168.99.100:8443/api/v1/namespaces/default/pods/private-reg/log
I0622 17:35:01.074126   15981 round_trippers.go:402] Request Headers:
I0622 17:35:01.074132   15981 round_trippers.go:405]     Accept: application/json, */*
I0622 17:35:01.074137   15981 round_trippers.go:405]     User-Agent: kubectl/v1.6.6 (linux/amd64) kubernetes/7fa1c17
I0622 17:35:01.079257   15981 round_trippers.go:420] Response Status: 200 OK in 5 milliseconds
I0622 17:35:01.079289   15981 round_trippers.go:423] Response Headers:
I0622 17:35:01.079299   15981 round_trippers.go:426]     Content-Type: text/plain
I0622 17:35:01.079307   15981 round_trippers.go:426]     Content-Length: 0
I0622 17:35:01.079315   15981 round_trippers.go:426]     Date: Thu, 22 Jun 2017 14:35:31 GMT

我该如何调试此问题？

  • 更新输出：

  • kubectl --v = 8 log ps-agent-2028336249-3pk43 --namespace = default -p

I0625 11：30：01.569903 13420 round_trippers.go:395]获取I0625 11：30：01.569920 13420 round_trippers.go：402]请求 Headers ：I0625 11：30：01.569927 13420 round_trippers.go：405]用户代理：kubectl / v1 .6.6（linux / amd64）kubernetes / 7fa1c17 I0625 11：30：01.569934 13420 round_trippers.go:405]接受：application / json，/ I0625 11：30：01.599026 13420 round_trippers.go:420]响应状态：200 OK in 29毫秒I0625 11：30：01.599048 13420 round_trippers.go：423]回应 Headers ：I0625 11：30：01.599056 13420 round_trippers.go：426]日期：2017年6月25日星期日08:30:01 GMT I0625 11：30：01.599062 13420 round_trippers.go：426] Content-Type：application / json I0625 11：30：01.599069 13420 round_trippers.go:426] Content-Length：2794 I0625 11：30：01.599264 13420 request.go:991] Response Body：{"kind"： "Pod"，_ "apiVersion"："v1"，"metadata"：{_ "name"："ps-agent-2028336249-3pk43"，"generateName"："ps-agent-2028336249-"，"namespace"："default"，"selfLink"："/api/v1/namespaces/default/pods/ps-agent-2028336249-3pk43"，"uid"："87c69072-597e-11e7-83cd-08002773375c"，"resourceVersion"："14354"，"creationTimestamp"：1279 602，"labels"：{"pod-template-hash"："2028336249"，"run"："ps-agent"}，"annotations"：{"kubernetes.io/created-by"："{"样\ ":" SerializedReference \ "," apiVersion \ ":" V1 \ ","参考\ ":{"样\ ":" ReplicaSet \ ","命名空间\ ":"默认\ ","名\ ":" PS-剂-2028336249 \ "," UID \ ":" 87c577b5-597e-11e7-83cd-08002773375c \ "," apiVersion \ ":"扩展\ "," resourceVersion \ ":" 13446 \ "}}\n"}，"ownerReferences"：[{"apiVersion"："extensions/v1beta1"，"kind"："ReplicaSet"，"name"："ps-agent-2028336249" ，"uid"："87c577b5-597e-11e7-83cd-08002773375c"，"controller"：真，"blockOwnerDeletion"：真}]}，"spec"：{"volumes"：[{"name"："default-token-bhvgz"，"secret"：{"secretName"："default-token-bhvgz"，"defaultMode"：420}}]，"containers"：[{"name"："ps-agent"，"image" ："ha/prod:ps-agent-latest"，"resources"：{}，"volumeMounts"：[{"name"："default-token-bhvgz"，"readOnly"：真，"mountPath"："/var/run/secrets/kubernetes.io/serviceaccount"}]，"terminationMessagePath"："/dev/termination-log"，"terminationMessagePolicy"："File"，"imagePullPolicy"："IfNotPresent"}]，"restartPolicy"："Always"，12 79667：30，"dnsPolicy"："ClusterFirst"，"serviceAccountName"："default"，"serviceAccount"："default"，"nodeName"："minikube"，"securityContext"：{}，"schedulerName"："default-scheduler"}，"status"：{"phase"："Running"，"conditions"：[{"type"："Initialized"，"status"："True"，"lastProbeTime" ：空，"lastTransitionTime"："2017-06-25T08:16:03Z"}，{"type"："Ready"，"status"："False"，"lastProbeTime"：空，"lastTransitionTime"："2017-06-25T08:16:03Z"，"reason"："ContainersNotReady"，"message"："containers with unready status: [ps-agent]"}，{"type"："PodScheduled"，"status"："True"，"lastProbeTime"：空，"lastTransitionTime"："2017-06-25T08:16:03Z" }]，"hostIP"："192.168.99.100"，"podIP"："172.17.0.5"，"startTime"："2017-06-25T08:16:03Z"，"containerStatuses"：[{"name"："ps-agent"，"state"：{"waiting"：{"reason"："CrashLoopBackOff"，"message"："Back-off 5m0s restarting failed container=ps-agent pod=ps-agent-2028336249-3pk43_default(87c69072-597e-11e7-83cd-08002773375c)"}}，"lastState"：{"terminated"：{"exitCode"：0，"reason" ："Completed"，"startedAt"：空，"finishedAt"："2017-06-25T08:27:17Z"，"containerID"："docker://1aa9dfbfeb80042c6f4c8d04cabb3306ac1cd52963568e621019e2f1f0ee081b"}}，"ready"：假，"restartCount"：7，"image"："ha/prod:ps-agent-latest"，"imageID"："docker://sha256:eb5307c4366fc129d022703625a5f30ff175b5e1a24dbe39fd4c32e726a0ee7b"，"containerID"："docker://1aa9dfbfeb80042c6f4c8d04cabb3306ac1cd52963568e621019e2f1f0ee081b"}]，"qosClass"："BestEffort"}} I0625 11：30：01.600727 13420 roun d_trippers.go:395] GET https://192.168.99.100:8443/api/v1/namespaces/default/pods/ps-agent-2028336249-3pk43/log?previous=true I0625 11：30：01.600747 13420 round_trippers.go:402]请求 Headers ：I0625 11：30：01.600757 13420 round_trippers.go：405]接受：application / json，/ I0625 11：30：01.600766 13420 round_trippers.go:405]用户代理：kubectl / v1.6.6（linux / amd64）kubernetes / 7fa1c17 I0625 11:30：01.632473 13420 round_trippers.go：420]响应状态：200 OK，31毫秒I0625 11:30： 01.632545 13420 round_trippers.go：423]回复 Headers ：I0625 11：30：01.632569 13420round_trippers.go:426]日期：2017年6月25日星期日08:30:01 GMT I0625 11：30：01.632592 13420 round_trippers.go:426]内容类型：文本/平原I0625 11：30：01.632615 13420 round_trippers.go： 426]内容长度：0

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1 回答

  • 9

    由"start"进程完成后立即退出的docker容器导致的问题 . 我添加了一个永远运行的命令，它工作正常 . 这个问题提到here

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