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Open a root shell on a Kubernetes cluster Node (no ssh).
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#!/bin/sh | |
# Copyright (c) 2019 Gonçalo Baltazar <me@goncalomb.com> | |
# MIT License | |
# Open a root shell on a Kubernetes cluster Node (no ssh). | |
# It uses a privileged container to unlock Linux capabilities and chroot to | |
# change into the root filesystem of the Node for full access. | |
# The Node is selected using the 'kubernetes.io/hostname' label. | |
# usage: k8s-node-gate.sh <node-hostname> | |
set -e | |
NODE_HOSTNAME=$1 | |
kubectl run "node-gate-"$NODE_HOSTNAME -it --rm --restart=Never --attach --image=busybox --overrides ' | |
{ | |
"spec": { | |
"nodeSelector": { | |
"kubernetes.io/hostname": "'$NODE_HOSTNAME'" | |
}, | |
"hostPID": true, | |
"hostIPC": true, | |
"hostNetwork": true, | |
"containers": [ | |
{ | |
"name": "node-gate", | |
"image": "busybox", | |
"stdin": true, | |
"tty": true, | |
"command": [ | |
"chroot", "/mnt/host" | |
], | |
"securityContext": { | |
"privileged": true | |
}, | |
"volumeMounts": [ | |
{ | |
"name": "host", | |
"mountPath": "/mnt/host" | |
} | |
] | |
} | |
], | |
"tolerations": [ | |
{ | |
"effect": "NoSchedule", | |
"operator": "Exists" | |
} | |
], | |
"volumes": [ | |
{ | |
"name": "host", | |
"hostPath": { | |
"path": "/" | |
} | |
} | |
] | |
} | |
} | |
' |
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