How to backup docker volumes on a docker host.

backup-docker-volumes.sh

#!/bin/bash
# this script backs up all existing docker volumes to archives
# by: Cody Kochmann

cd $(mktemp -d)
docker volume ls \
  | grep -v 'volume-backups' \
  | awk '/local/ {print "docker run -i --rm -v "$2":/outside:ro -v volume-backups:/bak --workdir /outside registry.gitlab.com/icody/containers/debian tar czfv /bak/"strftime("%Y.%m.%d.%H.%M.%S-",systime())$2".tar.gz ./"}' \
  | tee backup-volumes.sh
bash -x backup-volumes.sh