[檢視某個node上的pod]

> kubectl get pods -o wide --namespace=kube-system|grep master-0

> kubectl get pods --field-selector=spec.nodeName='master-0' --all-namespaces           #node master-0上的pod

或者> kubectl describe node worker-0

或者 > kubectl get pod  --field-selector spec.nodeName='master-0' --all-namespaces       

> kubectl get node | awk '{print $1}' | xargs -t -i kubectl get pods --field-selector spec.nodeName={} --all-namespaces   #列出每個node上的所有pod

[獲取pod的UID]

注：目錄/var/log/pods下資料夾名字是pod的UID; 獲取container詳細資訊時，裡面包含所屬pod的UID.

1) 方法一：jq

>kubectl get pods -n <namespace> <pod-name> -o jsonpath='{.metadata.uid}'

>kubectl get pod -n <namespace> <pod-name> -o json | jq '.metadata.uid'

From <https://stackoverflow.com/questions/57799684/how-do-i-get-the-pod-id-in-kubernetes>

2) 方法二：grep

>kubectl get pods -n <namespace> <pod-name> -o yaml | grep uid

3) 方法三：custom-column

>kubectl get pods -n <namespace> -o custom-columns=PodName:.metadata.name,PodUID:.metadata.uid      #推薦

(注：支援這些引數: metadata.name, metadata.namespace, spec.nodeName, spec.serviceAccountName, status.hostIP, status.podIP)

根據需要靈活使用，如下例子：

>kubectl get pods -A -o custom-columns=NodeName:.spec.nodeName,PodName:.metadata.name,PodUID:.metadata.uid|

>kubectl get pods -A -o custom-columns=PodName:.metadata.name,PodUID:.metadata.uid,PodIP:.status.podIP

>kubectl get pods -n <namespace> -o custom-columns=PodName:.metadata.name,PodUID:.metadata.uid,PodIP:.status.podIP

>kubectl get pods -n <namespace> -o custom-columns=PodName:.metadata.name,PodIP:.status.podIP,hostIp:.status.hostIP

>kubectl get pods -n <namespace> -o custom-columns=NodeName:.spec.nodeName,PodName:.metadata.name,PodIP:.status.podIP,hostIp:.status.hostIP

>kubectl get pods -n <namespace> -o custom-columns=NodeName:.spec.nodeName,PodName:.metadata.name,Service:spec.serviceAccountName

From <https://stackoverflow.com/questions/57799684/how-do-i-get-the-pod-id-in-kubernetes>

>kubectl get pod -A -o=jsonpath='{range.items[*]}{.metadata.name}{"\t"}{.status.podIP}{"\n"}{end}'

>kubectl get po $POD_NAME -n $NAMESPACE -o=jsonpath='{range.items[*]}{.metadata.name}{"\t"}{.status.podIP}{"\n"}{end}'    #該指令無效

 From <https://stackoverflow.com/questions/68167676/trying-to-get-a-particular-podip-of-a-pod-from-kubectl-get-po?noredirect=1&lq=1>

[獲取pod的container和image資訊]

1) 檢視pod裡面的container:

>kubectl describe pod xxx                    

2) 獲取pod裡的業務容器：

>kubectl get pod <pod name> -o jsonpath={.spec.containers[*].name} |xargs -n 1

例如: kubectl get pod csi-cinder-controllerplugin-0 -n kube-system -o jsonpath={.spec.containers[*].name}|xargs -n 1

3) 獲取pod裡的Initial容器：

>kubectl get pod <pod name> -o jsonpath={.spec.initContainers[*].name}

>kubectl get pods --all-namespaces -o jsonpath='{range .items[*]}{"pod: "}{.metadata.name}{"\n"}{range.status.containerStatuses[*]}{"\tname: "}{.containerID}{"\n\timage: "}{.image}{"\n"}{end}'

4) 獲取container id和image資訊：

參考文件：

how to get the container id in pod? · Issue #50309 · kubernetes/kubernetes · GitHub

Kubernetes API Reference Docs

JSONPath Support | Kubernetes

Expose Pod Information to Containers Through Files | Kubernetes

5) List All Container Images Running in a Cluster

From <https://kubernetes.io/docs/tasks/access-application-cluster/list-all-running-container-images/>

>kubectl get pods -n <namespace> -o jsonpath="{.items[*].spec.containers[*].image}"|xargs -n 1

>kubectl get pods --all-namespaces -o jsonpath="{.items[*].spec.containers[*].image}"|xargs -n 1

>kubectl get pods --all-namespaces -o jsonpath='{range.items[*]}{"\n"}{.metadata.name}{":\t"}{range .spec.containers[*]}{.image}{", "}{end}{end}'|
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