Скачать или смотреть How to CIFS Mount in a Docker Container Using Docker-Compose

Learn how to effectively mount a CIFS directory into a Docker container using Docker Compose with step-by-step instructions and code examples.
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Mounting CIFS Directory in Docker Container with Docker-Compose

If you've ever tried to mount a CIFS (Common Internet File System) directory into a Docker container using Docker Compose, you know that it can be tricky. Many users face issues when trying to set the right permissions and capabilities. In this post, we'll walk you through an effective method to perform a CIFS mount in a Docker container so you can get back to developing your applications without unnecessary headaches.

Understanding the Problem

CIFS allows your Docker containers to access shared directories on remote servers. However, when dealing with Docker Compose configuration and running commands within containers, you can run into permission issues that stop you from successfully mounting the CIFS share. Common symptoms include the error message Unable to apply new capability set.

Here's a quick overview of the relevant parts of the Docker ecosystem and the setup you're likely using:

Docker Image: The template from which a container is created.

Docker Compose: A tool for defining and running multi-container Docker applications.

Dockerfile: Defines the steps to build the Docker image, including installing necessary packages.

Now, let’s explore how to fix the mounting problem in your Docker container.

Step-by-Step Solution

1. Update Your Dockerfile

First, ensure you have the necessary utilities installed in your Docker image. Your Dockerfile should install cifs-utils, which is required for CIFS operations. Here's the modified version based on your snippet:

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2. Create the Mount Command

The key to successfully mounting the CIFS share is to execute the mount command at the right moment. This means adding it to your run.sh script, which is executed when the container starts. Here’s a suggested implementation:

[[See Video to Reveal this Text or Code Snippet]]

3. Modify docker-compose.yaml

Make sure your docker-compose.yaml file includes the privileged flag as this is often necessary to allow the container to perform mounting operations.

[[See Video to Reveal this Text or Code Snippet]]

4. Building and Running

After making the above changes, you can build and run your Docker container using the following commands:

[[See Video to Reveal this Text or Code Snippet]]

Important Note

Ensure that the user specified in the mount command has the appropriate permissions on the CIFS share.

The username and password used should be securely managed and not exposed directly in the script; consider using environment variables.

Conclusion

By structuring your run.sh file to include the CIFS mount command and making sure your Docker Compose setup allows for the necessary privileges, you can successfully mount directories in your Docker containers. This process can streamline your workflow, especially when working with shared resources. Be sure to troubleshoot any permissions issues you may encounter and adjust your settings accordingly.

Feel free to reach out with any questions or share your experiences with CIFS mounts in Docker!