Install python libraries on all openshift pods

Question

I have a redash server deployed on an on premise openshift cluster, with about 20 pods. I want to install new python libraries on the server and I'm able to ssh to one of the pods using oc rsh and run pip install x .

The problem is that I have a lot of pods and don't want to ssh to each pods when I need a new library. I also don't want to change the image and have to redeploy my server every time. Is there a way to run a command on all pods at the same time?

Answer 1

It is generally not a good idea to do Pod maintenance using oc rsh . The right way to go here would be to update the container image and redeploy your application , that is how Kubernetes / OpenShift works.

For example, when one of your Pods is restarted for any reason (the underlying Node has an issue, your application crashes, an administrator deletes a Pod, ...) then your change will be gone as the Pod is restarted.

Usually, container images are built via a pipeline or similar, so re-building an image should not be an issue. That being said, a hacky way to run a command in all Pods is the following:

for pod in $(oc get pods -o name); do
  oc rsh $pod pip install x
done