我的kubernetes吊舱一直以“crashloopbackoff”崩溃，但我找不到任何日志

Question

这是我一直得到的：

[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

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)"

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

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

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

[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，我就可以毫无问题地运行映像，只是通过kubernetes我得到了崩溃。

有人能帮帮我吗，我怎么能在没有看到任何日志的情况下调试呢？

Answer 1

正如@Sukumar评论的那样，您需要让您的Dockerfile有一个要运行的命令，或者让您的ReplicationController指定一个命令。

吊舱是崩溃的，因为它启动，然后立即退出，因此库伯内特斯重新启动，循环继续。