docker backup script

backup_container.sh

#!/bin/sh

# Given a container name, find the exposed volumes in the container
# and back them up into a tgz

#     backup_container graphite_data  backup.tgz

CONT=$1
OUTFILE=$2

if [ -z "${CONT}" ]; then
  echo "Usage: "
  echo
  echo "   backup_container <NAME> [<BACKUPFILE.TGZ>]"
  echo
  echo "eg. backup_container graphite_data graphite_data_backup.tgz"
  echo
  echo "If BACKUPFILE not given, will send to stdout"
  exit 0
fi


VOLS=`docker inspect --format='{{range $k, $v := .Volumes}}{{$k}} {{end}}' ${CONT}`
PARENT=`docker inspect --format='{{.Config.Image}}' ${CONT}`

CMD="docker run --rm --volumes-from=${CONT} ${PARENT} tar -zc ${VOLS}"

if [ ! -z "${OUTFILE}" ]; then
   exec $CMD > ${OUTFILE}
else
   exec $CMD
fi