Simple script to backup volumes in docker compose env.

backup_docker_compose.sh

#!/bin/bash

# Function to get Docker API version
get_docker_api_version() {
  docker version --format '{{.Server.APIVersion}}'
}

# Function to get volume paths from docker-compose and backup
backup_volumes() {
  # Get the API version
  API_VERSION=$(get_docker_api_version)
  echo "Docker API Version: $API_VERSION"

  # Create a backup directory with the current date
  BACKUP_DIR="backup-$(date +%Y%m%d)"
  mkdir -p "$BACKUP_DIR"
  echo "Backup directory created: $BACKUP_DIR"

  # Get all container ids from docker-compose
  container_ids=$(docker-compose ps -q)

  # Loop through each container
  for container_id in $container_ids; do
    # Get container details
    container_info=$(docker inspect $container_id)

    # Get volumes from container info
    volumes=$(echo $container_info | jq -r '.[].Mounts | .[] | select(.Type == "volume") | .Name')

    # Backup each volume
    for volume in $volumes; do
      destination=$(docker inspect $container_id| jq -r --arg volume "$volume" '.[].Mounts[] | select(.Type == "volume" and .Name == $volume) | .Destination')
      BACKUP_FILE="${volume}_$(date +%Y%m%d%H%M).tar"
      docker run --rm --volumes-from $container_id -v "$(pwd)/$BACKUP_DIR":/backup ubuntu tar cvf /backup/"$BACKUP_FILE" "$destination"
      echo "Volume $volume from container $container_id backed up as $BACKUP_FILE"
    done
  done
}

# Check if docker-compose is present
if ! command -v docker-compose &> /dev/null
then
    echo "docker-compose could not be found, please install it and run this script again."
    exit 1
fi

# Check if jq is present
if ! command -v jq &> /dev/null
then
    echo "jq could not be found, please install it and run this script again."
    exit 1
fi

# Start the backup process
backup_volumes