48 lines
1.8 KiB
Markdown
48 lines
1.8 KiB
Markdown
---
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title: "PVC Debug Pod"
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date: 2024-03-04T22:05:41-08:00
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tags:
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- k8s
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---
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I've been annoyed sufficiently-often by the fact that there is no single `kubectl` command to "_create a pod, and attach a PVC to it_" that I threw together the following script:
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<!--more-->
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```bash
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#!/bin/bash
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set -ex
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# This script assumes the existence and correct configuration of `kubectl` and `fzf`.
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# TODO - cool feature would be to grab namespaces with `kubectl get ns` and pipe through `fzf` to select - but, 99% of the time, this'll just be for the current namespace anyway
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PVC_TO_MOUNT=$(kubectl get pvc --no-headers | awk '{print $1}' | fzf)
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POD_CREATE_OUTPUT=$(cat <<EOF | kubectl create -f -
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apiVersion: v1
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kind: Pod
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metadata:
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generateName: debug-pod-
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spec:
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volumes:
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- name: pvc
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persistentVolumeClaim:
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claimName: $PVC_TO_MOUNT
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containers:
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- name: debug-container
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image: ubuntu
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command: [ "/bin/bash", "-c", "--" ]
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args: [ "while true; do sleep 30; done;" ]
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volumeMounts:
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- mountPath: "/mnt/pvc"
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name: pvc
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EOF
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)
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POD_NAME=$(echo $POD_CREATE_OUTPUT | awk '{print $1}')
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kubectl wait --for=condition=Ready $POD_NAME
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kubectl exec -it $POD_NAME /bin/bash
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```
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While researching it, I did find out that [Ephemeral Containers](https://kubernetes.io/docs/concepts/workloads/pods/ephemeral-containers/) are now a thing - but, given that they also don't appear to allow a PVC-mount in their `kubectl`-creation, I suspect you'd still have to create via `cat <<EOF | kubectl create`[^why-create] anyway.
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[^why-create]: Why `create` and not `apply`? Because you can't use `generateName` with `apply`, and if I accidentally forget to tear down an pre-existing debug-pod I'd rather not be interrupted in what I'm doing. Arguably, though, that would be a good reminder to clean up after myself.
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