Dkrutil

Dkrutil is a command-line tool that provides utility functions for managing Docker containers, volumes, images, and secrets.
It simplifies common tasks like listing running containers, backing up and restoring volumes, retrieving Docker image tags from Docker Hub, and securely managing secrets via Docker volumes.

Installation

You can install dkrutil directly from PyPI:

pip install dkrutil

For isolated environments and ease of management, you can use pipx:

pipx install dkrutil

Or install it using uv for development:

uv pip install dkrutil

Usage

Dkrutil provides the dkrutil command with various subcommands.

Containers

List running containers

dkrutil container ps

Options:

• -a, --all → Show all containers, including stopped ones.

Volumes

Backup Docker volumes

dkrutil volume backup -d /path/to/backup

Options:

• -d, --backup-directory → Directory where the volumes will be backed up.
• -i, --include → Regex pattern to include specific volumes (can be repeated).
• -I, --ignore → Regex pattern to ignore specific volumes (can be repeated).
• -v, --verbose → Show skipped volumes in real time.

Restore Docker volumes

dkrutil volume restore -d /path/to/backup

Options:

• -d, --backup-directory → Directory containing the backup files.

Images

Retrieve all tags of an image

dkrutil image tags alpine

Options:

• -d, --digest → Filter tags by a specific SHA256 digest.
• -t, --tag → Retrieve the digest of a specific tag.

Secrets

Create a secret stored in a Docker volume

dkrutil secret create <name> [FILE|-] [-p]

This command stores a secret securely inside a Docker named volume.

• If FILE is omitted or set to -, the content is read from standard input.
• A file named <name> will be created inside the volume <name> with the secret content.
• If the volume already exists, the command will fail (no overwrite).
• Use -p to force an interactive masked prompt.

Examples:

# From a file
dkrutil secret create db_password ./my-password.txt

# From stdin
echo "supersecret" | dkrutil secret create db_password


# Prompt
dkrutil secret create db_password -p

Configuration

Dkrutil uses the docker Python library to interact with the Docker API. Ensure Docker is installed and running before using this tool.

Development

Clone the repository:

git clone https://github.com/emerick-biron/dkrutil.git
cd dkrutil

Install dependencies with uv:

uv pip install -e .

Run the tool locally:

dkrutil --help

Build the package:

uv build