kubernetes实践之五十三：Service中的故障排查

1.查看某种资源的定义和用法
kubectl  explain

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 kubectl explain pod
 DESCRIPTION:
 Pod is a collection of containers that can run on a host. This resource is created by clients and scheduled onto hosts.

 FIELDS:
    apiVersion
      APIVersion defines the versioned schema of this representation of an
      object. Servers should convert recognized schemas to the latest internal
      value, and may reject unrecognized values. More info:
      https://git.k8s.io/community/contributors/devel/api-conventions.md#resources

    kind
      Kind is a string value representing the REST resource this object
      represents. Servers may infer this from the endpoint the client submits
      requests to. Cannot be updated. In CamelCase. More info:
      https://git.k8s.io/community/contributors/devel/api-conventions.md#types-kinds

    metadata    <Object>
      Standard object

2.查看Pod的状态
kubectl get pods
kubectl describe pods my-pod
3.监控Pod状态的变化
kubectl get pod -w
可以看到一个 namespace 中所有的 pod 的 phase 变化。
4.查看Pod的日志
kubectl logs my-pod
kubectl logs my-pod -c my-container
kubectl logs -f my-pod
kubectl logs -f my-pod -c my-container
5.交互式Debug
kubectl exec my-pod -it /bin/bash
kubectl top pod POD_NAME --containers
6.Pod的临终遗言
Pod的定义中通过.spec.containers[].terminationMessagePath指定在容器中的临终遗言日志文件的路径，默认值是/dev/termination-log.这个文件在Pod的整个生命周期内都会保存，每次新建一个Pod,都会在宿主机上创建一个文件，然后挂载到Pod的容器中，这些文件不会因为容器的销毁而丢失，所以容器可以把临终遗言写入这个文件，方便问题安排排错。

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转载于:http://blog.itpub.net/28624388/viewspace-2155913/