OpenShift 3 Node Shell

A modified version of Kubernetes Node Shell or NShell or KubeCtl-Enter from kvaps for OpenShift 3.

Since OpenShift 3 doesn't have ability to debug node oc debug node/<node-name> like OpenShift 4 then this can be a helper if something happened to you node and you can't access it from your secure shell

Installation

Make sure you already have the same version of OpenShift Client and KubeCtl on you local like in the Master Node, or you can just straight through the installation in Master Node

oc version
kubectl version

Creating a project where the Node Shell pod will be deployed

oc adm new-project node-shell

Now we need to patch the project so the pod can deployed in everynode that we want, by default OpenShift only allowing pod to be deployed in spesific node with selector region=primary

oc patch namespace node-shell -p '{"metadata": {"annotations": {"openshift.io/node-selector": ""}}}'

Next we also need to grant a SCC privileged to our default service account in a project that we created before, in this case it will be node-shell

oc adm policy add-scc-to-user privileged -z default -n node-shell

Download the OpenShift Node Shell from this repository and set it as executable

wget -O /usr/local/bin/oc-node-shell https://raw.githubusercontent.com/dimaskiddo/openshift-node-shell/master/oc-node-shell.sh
chmod 755 /usr/local/bin/oc-node-shell

And here we are, ready to go!

Usage

First get node name you want to enter

oc get nodes

After that to run the OpenShift Node Shell you need to run it under node-shell project that we are created before on the Installation step. You can run it with the following command

oc-node-shell -n node-shell <node-name>