我的kubernetes豆荚不断崩溃与“CrashLoopBackOff”，但我找不到任何日志

这就是我一直得到的答案:

[root@centos-master ~]# kubectl get pods
NAME               READY     STATUS             RESTARTS   AGE
nfs-server-h6nw8   1/1       Running            0          1h
nfs-web-07rxz      0/1       CrashLoopBackOff   8          16m
nfs-web-fdr9h      0/1       CrashLoopBackOff   8          16m

下面是描述pods的输出 Kubectl描述了豆荚

Events:
  FirstSeen LastSeen    Count   From                SubobjectPath       Type        Reason      Message
  --------- --------    -----   ----                -------------       --------    ------      -------
  16m       16m     1   {default-scheduler }                    Normal      Scheduled   Successfully assigned nfs-web-fdr9h to centos-minion-2
  16m       16m     1   {kubelet centos-minion-2}   spec.containers{web}    Normal      Created     Created container with docker id 495fcbb06836
  16m       16m     1   {kubelet centos-minion-2}   spec.containers{web}    Normal      Started     Started container with docker id 495fcbb06836
  16m       16m     1   {kubelet centos-minion-2}   spec.containers{web}    Normal      Started     Started container with docker id d56f34ae4e8f
  16m       16m     1   {kubelet centos-minion-2}   spec.containers{web}    Normal      Created     Created container with docker id d56f34ae4e8f
  16m       16m     2   {kubelet centos-minion-2}               Warning     FailedSync  Error syncing pod, skipping: failed to "StartContainer" for "web" with CrashLoopBackOff: "Back-off 10s restarting failed container=web pod=nfs-web-fdr9h_default(461c937d-d870-11e6-98de-005056040cc2)"

我有两个pod: nfs-web-07rxz, nfs-web-fdr9h，但如果我做kubectl日志nfs-web-07rxz或带-p选项，我在两个pod中都看不到任何日志。

[root@centos-master ~]# kubectl logs nfs-web-07rxz -p
[root@centos-master ~]# kubectl logs nfs-web-07rxz

这是我的replicationController yaml文件: replicationController yaml文件

apiVersion: v1 kind: ReplicationController metadata:   name: nfs-web spec:   replicas: 2   selector:
    role: web-frontend   template:
    metadata:
      labels:
        role: web-frontend
    spec:
      containers:
      - name: web
        image: eso-cmbu-docker.artifactory.eng.vmware.com/demo-container:demo-version3.0
        ports:
          - name: web
            containerPort: 80
        securityContext:
          privileged: true

我的Docker镜像是由这个简单的Docker文件制作的:

FROM ubuntu
RUN apt-get update
RUN apt-get install -y nginx
RUN apt-get install -y nfs-common

我在CentOs-1611上运行我的kubernetes集群，kube版本:

[root@centos-master ~]# kubectl version
Client Version: version.Info{Major:"1", Minor:"3", GitVersion:"v1.3.0", GitCommit:"86dc49aa137175378ac7fba7751c3d3e7f18e5fc", GitTreeState:"clean", BuildDate:"2016-12-15T16:57:18Z", GoVersion:"go1.6.3", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"3", GitVersion:"v1.3.0", GitCommit:"86dc49aa137175378ac7fba7751c3d3e7f18e5fc", GitTreeState:"clean", BuildDate:"2016-12-15T16:57:18Z", GoVersion:"go1.6.3", Compiler:"gc", Platform:"linux/amd64"}

如果我通过docker run运行docker映像，我能够运行映像而没有任何问题，只有通过kubernetes我得到了崩溃。

有人能帮我一下吗，我怎么调试而不看到任何日志?

当前回答

在你的yaml文件中，添加命令行和参数行:

...
containers:
      - name: api
        image: localhost:5000/image-name 
        command: [ "sleep" ]
        args: [ "infinity" ]
...

对我有用。

2020-05-30 07:31:27

其他回答

似乎Pod应该处于crashloopbackoff状态的原因有很多。

In my case, one of the container was terminating continuously due to the missing Environment value.

因此，调试的最佳方法是-

1. check Pod description output i.e. kubectl describe pod abcxxx
2. check the events generated related to the Pod i.e. kubectl get events| grep abcxxx
3. Check if End-points have been created for the Pod i.e. kubectl get ep
4. Check if dependent resources have been in-place e.g. CRDs or configmaps or any other resource that may be required.

2021-11-16 10:06:35

在你的yaml文件中，添加命令行和参数行:

...
containers:
      - name: api
        image: localhost:5000/image-name 
        command: [ "sleep" ]
        args: [ "infinity" ]
...

对我有用。

2020-05-30 07:31:27

在解决相同问题的同时，我发现使用kubeclt logs <pod_id>时没有日志。因此，我ssh:ed在节点实例中尝试使用普通docker运行容器。令我惊讶的是，这也失败了。

当以下列物品进入货柜时:

docker exec -it faulty:latest /bin/sh

我四处打听，发现它不是最新的版本。

实例上已经有一个错误的docker映像版本。

当我删除故障:最新实例与:

docker rmi faulty:latest

一切都开始运转起来。

2019-01-17 15:29:42

kubectl logs -f POD，将只生成运行中的容器的日志。后缀——previous用于从前一个容器获取日志。主要用于调试。希望这能有所帮助。

2023-01-25 20:18:17

在我的例子中，这个错误是特定于hello-world docker映像的。我使用nginx图像而不是hello-world图像，错误被解决了。

2021-01-21 17:08:35

我的kubernetes豆荚不断崩溃与“CrashLoopBackOff”，但我找不到任何日志

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