Get Disk and Node Info for Longhorn Backing Image Objects.

backing-image-info.sh

#!/bin/bash
# LICENSE: MIT Author: Brian Monroe
# This script needs an argument - Prompt for the backingImage object. 

if [[ -z "$1" ]]; then
  echo "The first argument (\$1) is empty or unset. You need to provide the name of a backingImage object. Here's a list:"
  echo "kubectl get backingImages -A"
  kubectl get backingImages -A
  exit 1
fi

DISKUUIDS=$(kubectl get backingImage  $1 -n longhorn-system -ojson | jq -r '.spec.diskFileSpecMap | keys[]')

for UUID in $DISKUUIDS; do
  # Get the Longhorn disk name based off the UUID.
  DISKNAME=$(kubectl get node.longhorn.io -n longhorn-system -oyaml |grep -B10 $UUID |grep diskName | awk '{print $2}')
  # Get the node on the disk based off the UUID.
  NODENAME=$(kubectl get node.longhorn.io -n longhorn-system -oyaml |grep -B10 $UUID |grep node | sed -E 's/^.*on node (\w+).*$/\1/gm')
  echo "Backing image $1 is on disk $DISKNAME on node $NODENAME"
done