Create a new Docker volume and fill it with local data

README.md

Create Docker volume

When moving from a local development environment to the cloud, e.g. Docker swarm or Kubernetes, you often need a way to access local files. However, in the cloud your local file system cannot be accessed anymore, so you need a way to copy your local files to a volume and mount that instead. This is the purpose of the script. You supply it with the volume name (e.g. schemas) and the local folder containing the schemas, e.g. ../../schemas, and a schemas volume is created, containing all data that is copied into the container.

./create_volume.sh schemas ../../schemas

create_volume.sh

#!/bin/bash

# Help function
display_help() {
    echo "Usage: ./create_volume.sh <volume_name> <source_directory>"
    echo ""
    echo "Arguments:"
    echo "  <volume_name>      Name for the Docker volume"
    echo "  <source_directory> Path to the source directory on the host machine (relative or absolute)"
}

# Check if help option is passed
if [[ "$1" == "-h" || "$1" == "--help" ]]; then
    display_help
    exit 0
fi

# Check if at least two arguments are provided
if [ $# -lt 2 ]; then
    echo "Error: Invalid number of arguments"
    display_help
    exit 1
fi

# Arguments
volume_name=$1
source_directory=$2

# Create the volume (skipped if the volume already exists)
docker volume create "$volume_name" >/dev/null

# Create a temporary container to perform the copy
container_id=$(docker create -v "$volume_name:/target" alpine)

# Copy the data from the source directory to the volume using the container
docker cp "$source_directory/." "$container_id:/target"

# Remove the temporary container
docker rm "$container_id" >/dev/null

echo "Data copied successfully to the Docker volume."