kubectl run with PVCs

kubectl-run-with-pvc.sh

#!/bin/bash

IMAGE="gcr.io/google-containers/ubuntu-slim:0.14"
COMMAND="/bin/bash"
SUFFIX=$(date +%s | shasum | base64 | fold -w 10 | head -1 | tr '[:upper:]' '[:lower:]')

usage_exit() {
    echo "Usage: $0 [-c command] [-i image] PVC ..." 1>&2
    exit 1
}

while getopts i:h OPT
do
    case $OPT in
        i)  IMAGE=$OPTARG
            ;;
        c)  COMMAND=$OPTARG
            ;;
        h)  usage_exit
            ;;
        \?) usage_exit
            ;;
    esac
done
shift $(($OPTIND - 1))

VOL_MOUNTS=""
VOLS=""
COMMA=""

for i in $@
do
  VOL_MOUNTS="${VOL_MOUNTS}${COMMA}{\"name\": \"${i}\",\"mountPath\": \"/pvcs/${i}\"}"
  VOLS="${VOLS}${COMMA}{\"name\": \"${i}\",\"persistentVolumeClaim\": {\"claimName\": \"${i}\"}}"
  COMMA=","
done

kubectl run -it --rm --restart=Never --image=${IMAGE} pvc-mounter-${SUFFIX} --overrides "
{
  \"spec\": {
    \"hostNetwork\": true,
    \"containers\":[
      {
        \"args\": [\"${COMMAND}\"],
        \"stdin\": true,
        \"tty\": true,
        \"name\": \"pvc\",
        \"image\": \"${IMAGE}\",
        \"volumeMounts\": [
          ${VOL_MOUNTS}
        ]
      }
    ],
    \"volumes\": [
      ${VOLS}
    ]
  }
}
" -- ${COMMAND}

Because this is debug tool, i suggest adding general NoSchedule toleration to spec, like this:

    \"tolerations\": [
      {
        \"effect\": \"NoSchedule\",
        \"operator\": \"Exists\"
      }
    ],

With this it would run on nodes that have any NoSchedule taints on them

Exactly what I needed, thanks for sharing!

mucho gracias.

Many thanks, very useful!!!

This was incredibly useful. Thank you!

thanks a lot

how to set the PodSpec.SecurityContext ?

``found it
\"spec\": { \"securityContext\": { \"runAsUser\": 1000, \"runAsGroup\": 1000, \"fsGroup\": 2000 },

I was unable to run a command with an argument like "ls /pvcs".
I've added the following and now it works

ARGS=`echo $COMMAND | jq -cR 'split(" ")'`

kubectl run -it --rm --restart=Never --image=${IMAGE} pvc-mounter-${SUFFIX} --overrides "
{
  \"spec\": {
    \"hostNetwork\": true,
    \"containers\":[
      {
        \"args\": ${ARGS},
        \"stdin\": true,
        \"tty\": true,
        \"name\": \"pvc\",
        \"image\": \"${IMAGE}\",
        \"volumeMounts\": [
          ${VOL_MOUNTS}
        ]
      }
    ],
    \"volumes\": [
      ${VOLS}
    ]
  }
}
" -- ${COMMAND}

thanks! Time saver for me!