Kubernetes Pod to debug docker of the Node

debug-docker.yaml

apiVersion: v1
kind: Pod
metadata:
  name: debug-docker
spec:
  nodeSelector:
    kubernetes.io/hostname: <nodename>
  containers:
  - name: dind
    image: docker:stable
    args:
      - sleep
      - "36000"
    securityContext:
      privileged: true
    volumeMounts:
    - name: dockerrun
      mountPath: /var/run/docker.sock
  terminationGracePeriodSeconds: 30
  volumes:
  - name: dockerrun
    hostPath:
      path: /var/run/docker.sock

1. Replace <nodename> with the one to debug
2. kubectl create -f debug-docker.yaml
3. kubectl exec -it debug-docker sh

To access filesystem of a failed pod:

1. Get the node where the pod run: kubectl get pods -a -o wide
2. Exec as above
3. Get docker container id: docker ps -a |grep <some string from pod name>
4. docker commit <container-id> temp-image
5. docker run -ti --entrypoint=sh temp-image