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Dockerizing the Plex Dupefinder Python Application

This guide outlines the steps for Dockerizing the Plex Dupefinder Python application using Docker.

Folder Structure

Ensure that your project has the following folder structure:

plex_dupefinder/
│
└── app/
    └── Dockerfile  # (Included from git checkout)
    └── ... (all contents from the git checkout)
  • plex_dupefinder/: Root directory for the Plex Dupefinder project.
  • app/: Contains all files and directories retrieved from the git checkout, including the Dockerfile.

Setting Up the Folder Structure

Follow these steps to set up the folder structure and retrieve your Python application files:

  1. Open a terminal and navigate to the desired directory for your project.
  2. Run the following command to clone your repository and create the app/ folder: 
    git clone https://github.com/Hossy/plex_dupefinder.git app

This command clones your repository and creates the /app folder containing all files and directories from the git checkout, including the Dockerfile.

Building the Docker Image

Follow these steps to build the Docker image for your Python application:

  1. Open a terminal and navigate to the root directory of your project.
  2. Run the following command to build the Docker image: 
    docker build -t plex_dupefinder app

This command builds the Docker image named plex_dupefinder using the Dockerfile located in the app/ directory.

Preserving the Locally-Built Image

To preserve the locally-built image when running docker system prune, follow these additional steps:

  1. When building the Docker image, add a label to it using the --label flag:

    docker build -t plex_dupefinder --label "preserve=true" app

    This command adds the label preserve=true to the plex_dupefinder image.

  2. When running docker system prune, use the --filter flag to exclude images with the preserve=true label:

    docker system prune -af --filter "label!=preserve=true"

    This command prunes all unused data (containers, networks, volumes, and images) except those with the preserve=true label, ensuring that the locally-built image is preserved from deletion.

Running the Docker Container

Once the Docker image is built, you can run it as a Docker container using the following steps:

  1. Run the following command to start a Docker container from the image:

    docker run --rm --name plex_dupefinder -v plex_dupefinder/app:/app plex_dupefinder
    • Replace plex_dupefinder/app with the absolute path to the app/ directory on your system.

  2. If running with SKIP_OTHER_DUPES=false, add the -i option to the docker run command:

    docker run -i --rm --name plex_dupefinder -v plex_dupefinder/app:/app plex_dupefinder

    The -i option ensures interactive mode, allowing input to be sent to the container.