podWithHostFS.yaml

###########################################################
## This file has the configuration for
## - A namespace called 0-danger-zone (for easy sort and context)
## - A hostPath PersistentVolume
## - A PersistentVolumeClaim to use the PersistentVolume
## - A pod with host root file system mounted to /mnt/hostfs
##
## This is useful for exploring the host file system for various
## debugging scenarios like examining the kubelet configuration.
## USE WITH CAUTION! Changes here can break your node!
##
## Deploy: kubectl apply -f podWithHostFS.yaml
## Terminal access: kubectl exec -n 0-danger-zone -it pod-with-host-fs -- bash
## Remove: kubectl delete -f podWithHostFS.yaml
###########################################################
apiVersion: v1
kind: Namespace
metadata:
  name: 0-danger-zone
---
apiVersion: v1
kind: Pod
metadata:
  name: pod-with-host-fs
  namespace: 0-danger-zone
spec:
  containers:
    - name: container-with-host-fs
      image: ubuntu:20.04
      command:
        - 'bash'
        - '-c'
        - >
          echo "############# Setting up some tools...";
          apt update && apt install vim curl -y;
          echo -e "\n\n############# Get scripts...";
          cd /opt;
          curl -# -O https://raw.githubusercontent.com/eldada/command-examples/master/scripts/top.sh;
          curl -# -O https://raw.githubusercontent.com/eldada/command-examples/master/scripts/procInfo.sh;
          chmod +x *.sh;
          ls -la;
          echo -e "\n\n############# Going to sleep for 30 days...";
          sleep 30d
      resources:
        limits:
          cpu: 200m
          memory: 200Mi
        requests:
          cpu: 5m
          memory: 50Mi
      securityContext:
        privileged: true
      volumeMounts:
        - mountPath: /mnt/hostfs
          name: hostpath-privileged
  securityContext: {}
  volumes:
    - name: hostpath-privileged
      persistentVolumeClaim:
        claimName: host-pvc-volume
## Uncomment to apply node affinity when you need to force the pod to start on a given node
## Replace NODE_HOST_NAME with the value of the label "kubernetes.io/hostname" on the node
#  affinity:
#    nodeAffinity:
#      requiredDuringSchedulingIgnoredDuringExecution:
#        nodeSelectorTerms:
#          - matchExpressions:
#              - key: kubernetes.io/hostname
#                operator: In
#                values:
#                  - NODE_HOST_NAME

---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: host-pv-volume
  labels:
    type: local
spec:
  storageClassName: manual
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/"
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: host-pvc-volume
  namespace: 0-danger-zone
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi
  storageClassName: manual