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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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