1.檢視某種資源的定義和用法
kubectl explain

點選(此處)摺疊或開啟

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.檢視Pod的狀態
kubectl get pods
kubectl describe pods my-pod
3.監控Pod狀態的變化
kubectl get pod -w
可以看到一個 namespace 中所有的 pod 的 phase 變化。
4.檢視Pod的日誌
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.互動式Debug
kubectl exec my-pod -it /bin/bash
kubectl top pod POD_NAME --containers
6.Pod的臨終遺言
Pod的定義中透過.spec.containers[].terminationMessagePath指定在容器中的臨終遺言日誌檔案的路徑，預設值是/dev/termination-log.這個檔案在Pod的整個生命週期內都會儲存，每次新建一個Pod,都會在宿主機上建立一個檔案，然後掛載到Pod的容器中，這些檔案不會因為容器的銷燬而丟失，所以容器可以把臨終遺言寫入這個檔案，方便問題安排排錯。

kubernetes實踐之五十三：Service中的故障排查

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