0x0 Background

Recently, I have working on creating a project on Docker Compose. During this process, I encountered an issue where my program running inside the Docker container was denied permission to write files to the Docker Volume.

0x1 Get the Permission

If you are mounting a host directory into a Docker container, you could try granting permissions with your host by running chmod -R 777 your_folder.

In another case, there is a volume managed by Docker, and you cannot directly chmod with your host. Instead, you can mount your volume into a container with root permission (such as alpine) and grant the permission using chmod.

0x2 Other Solution Suggested by AI

I also tried asking this question to an AI, and it provided a solution using a YAML configuration, which might work as well (although I haven't tested it). Adding a separate container in a regular docker-compose.yaml task might be too resource-intensive, but it could be acceptable as a one-time solution.

services:
  init:
    image: "alpine"
    volumes:
      - your_volume:/data/your_folder
    command: ["chmod", "-R", "777", "/data/your_folder"]