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Simple Bash script to backup Docker Bind data & Volumes

Troy Rippin

Troy Rippin

• 1 min read

Introduction

Regular data backups are vital. We all know this. So in that spirit, I've made a simple bash script that does the following:

  1. Stops all running Docker containers on the server.
  2. Creates an archieve file of all the bind mount data.
  3. Creates archieves of all the Docker volumes in use.
  4. Copies all archieves created from the server to my desktop.
  5. Removes all archieves created by the script from the server.
  6. Restarts all the Docker containers on the server.

Prerequisites

In order for the SCP command to function you need to have SSH password-less connection setup between the two devices.

The Script

#!/bin/bash
# a back up script for docker container data

echo stopping services...
docker stop $(docker ps -a -q) > /dev/null
echo -en '\n'
sleep 10

echo creating archives...
tar -cPvf "server_backup_$(date +"%Y-%m-%d").tar.gz" --exclude=/opt/containerd -C /opt . > /dev/null
tar -cPvf "ghost-data_volume_backup_$(date +"%Y-%m-%d").tar.gz" -C /var/lib/docker/volumes ghost-data > /dev/null
tar -cPvf "grafana-data_volume_backup_$(date +"%Y-%m-%d").tar.gz" -C /var/lib/docker/volumes grafana-data > /dev/null
tar -cPvf "influxdb-data_volume_backup_$(date +"%Y-%m-%d").tar.gz" -C /var/lib/docker/volumes influxdb-data > /dev/null
tar -cPvf "mariadb-data_volume_backup_$(date +"%Y-%m-%d").tar.gz" -C /var/lib/docker/volumes mariadb-data > /dev/null
tar -cPvf "prometheus_volume_backup_$(date +"%Y-%m-%d").tar.gz" -C /var/lib/docker/volumes prometheus-data > /dev/null
echo -en '\n'
sleep 10

echo copying archive to remote location...
scp -i /home/user/.ssh/id_rsa *.tar.gz [email protected]:~/Downloads/ > /dev/null
echo -en '\n'
sleep 10

echo removing archive from server...
rm *.tar.gz
echo -en '\n'
sleep 10

echo starting services...
docker start $(docker ps -a -q) > /dev/null
echo -en '\n'
sleep 10

echo back up completed and services resumed.

The script file is stored in the user home folder. It needs to have execute permissions to run.

chmod +x docker_script.sh

The script needs to run as root in order to work (archiving folders that are owned by root).

sudo ./docker_script.sh

I run mine with a crontab job on the 1st day of the month as my data doesn't change very much (now that my homelab is setup correctly).

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