This script backups a Docker container instance, by creating a new docker image and exports this to a .tar

docker-teamspeak-snapshot.sh

#!/bin/sh

log_file=${BACKUP_LOG_FILE}

backup_script_name="docker-teamspeak-snapshot"
date=$(/bin/date +"%Y-%m-%d_%H-%M-%S")

echo "Started $backup_script_name at $date" >> $log_file

echo "Create a new snapshot_teamspeak docker image.." >> $log_file
docker commit -p teamspeak snapshot_teamspeak >> $log_file

echo "Export the snapshot_teamspeak image to a tar.." >> $log_file
docker save -o /var/backup/docker-container/snapshot_teamspeak_$date.tar snapshot_teamspeak >> $log_file;

echo "Remove untagged / old images.." >> $log_file
docker rmi $(docker images | grep "^<none>" | awk '{print $3}') >> $log_file

# We only want to store backups 14 days, so let's remove old ones
echo "Look for old backups and remove them..." >> $log_file
for file in "$( /usr/bin/find /var/backup/docker-container -type f -mtime +14 )"
do
/bin/rm -f $file >> $log_file
done

echo -e "Finished $backup_script_name at $(date +"%Y-%m-%d_%H-%M-%S") \n" >> $log_file

exit 0