这就是我不断得到的:
[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
下面是describe pods kubectl describe pods的输出
describe pods
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,但是如果我这样做kubectl logs nfs- web-07rxz或使用-p选项,我在两个 pod 中都看不到任何日志。
nfs-web-07rxz
nfs-web-fdr9h
kubectl logs nfs- web-07rxz
-p
[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"}
如果我运行 docker 镜像,docker run我可以毫无问题地运行镜像,只有通过 kubernetes 我才会崩溃。
docker run
有人可以帮我吗,我如何在没有看到任何日志的情况下进行调试?
正如@Sukumar 评论的那样,你需要让你的 Dockerfile 有一个命令来运行,或者让你的 ReplicationController 指定一个命令。
Pod 正在崩溃,因为它启动然后立即退出,因此 Kubernetes 重新启动并继续循环。