无法获取 Kubernetes K8S pod 的日志（调试）答案

【问题标题】：Can not get logs of Kubernetes K8S pod (to debug)无法获取 Kubernetes K8S pod 的日志（调试）
【发布时间】：2021-11-30 17:47:49
【问题描述】：

我有 1 个主节点和 2 个节点正在运行，并且要调试 kube-proxy。

kube-m1:/$ kubectl get pod -n kube-system kube-proxy-tmt58
NAME               READY   STATUS    RESTARTS   AGE
kube-proxy-tmt58   1/1     Running   6          439d

如何指定命名空间以获取 kubectl logs 来调试 pod？

kube-m1:/$ kubectl logs kube-proxy-tmt58
Error from server (NotFound): pods "kube-proxy-tmt58" not found

我是 kubernetes 的新手，因此，如果能获得一些关于 pod 和节点调试的良好且有效的指南或材料，也会非常有帮助：)

非常感谢。

【问题讨论】：

标签： kubernetes nodes kube-proxy

【解决方案1】：

就像你获取一个 pod 一样，指定一个命名空间你可以传递 -n | --namespace 标志，所以你的命令看起来像

kubectl logs kube-proxy-tmt58 -n kube-system

【讨论】：

【解决方案2】：

除了@jabbson 的回答我只想提一下并推荐你保存到书签中kubectl Cheat Sheet。这个页面有大量的 kubectl 使用示例。对深入kubernetes世界有很大帮助。

# Get commands with basic output
kubectl get services                          # List all services in the namespace
kubectl get pods --all-namespaces             # List all pods in all namespaces
kubectl get pods -o wide                      # List all pods in the current namespace, with more details
kubectl get deployment my-dep                 # List a particular deployment
kubectl get pods                              # List all pods in the namespace
kubectl get pod my-pod -o yaml                # Get a pod's YAML

# Describe commands with verbose output
kubectl describe nodes my-node
kubectl describe pods my-pod

# Get all worker nodes (use a selector to exclude results that have a label
# named 'node-role.kubernetes.io/master')
kubectl get node --selector='!node-role.kubernetes.io/master'

# Get all running pods in the namespace
kubectl get pods --field-selector=status.phase=Running

# Get ExternalIPs of all nodes
kubectl get nodes -o jsonpath='{.items[*].status.addresses[?(@.type=="ExternalIP")].address}'

# Logs
kubectl logs my-pod                                 # dump pod logs (stdout)
kubectl logs -l name=myLabel                        # dump pod logs, with label name=myLabel (stdout)
kubectl logs my-pod --previous                      # dump pod logs (stdout) for a previous instantiation of a container
kubectl logs my-pod -c my-container                 # dump pod container logs (stdout, multi-container case)
kubectl logs -l name=myLabel -c my-container        # dump pod logs, with label name=myLabel (stdout)
kubectl logs my-pod -c my-container --previous      # dump pod container logs (stdout, multi-container case) for a previous instantiation of a container
kubectl logs -f my-pod                              # stream pod logs (stdout)
kubectl logs -f my-pod -c my-container              # stream pod container logs (stdout, multi-container case)
kubectl logs -f -l name=myLabel --all-containers    # stream all pods logs with label name=myLabel (stdout)

【讨论】：