Скачать или смотреть How to Isolate Docker Container from the Host Network using Docker Compose

Learn how to effectively isolate your Docker container from external access by using Docker Compose configurations. Discover the `expose` property versus the `ports` mapping for enhanced network security.
---
This video is based on the question https://stackoverflow.com/q/74038521/ asked by the user 'bob' ( https://stackoverflow.com/u/19916855/ ) and on the answer https://stackoverflow.com/a/74038575/ provided by the user 'Alexandre LEROY' ( https://stackoverflow.com/u/10702448/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How to isolate docker container from the host network (docker-compose)

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Isolate Docker Container from the Host Network using Docker Compose

Are you facing challenges isolating your Docker container from the host network? If so, then you’re not alone! The need for network security is crucial as applications often touch upon sensitive data. In this post, we'll explore how to isolate a Docker container using Docker Compose, so you can keep your services secure from external access.

Understanding the Challenge

Imagine you have a Python script running in a Docker container, and it listens for incoming socket connections. You've set up your container with a bridge network, and yet you find you can access it from outside its designated network using localhost:port. This presents a potential security risk if you want to limit access just to specific networks.

The Solution: Using the expose Property

To ensure your container is not accessible from external sources, instead of mapping ports using the ports property, you should use the expose instruction in your Docker Compose file. This allows containers to communicate internally without exposing them to the host’s network.

Step-by-Step Instructions

Let’s break down the solution into manageable steps. Here’s how to modify your Docker Compose configuration:

Open Your Docker Compose File: Begin by accessing the docker-compose.yml file where your container is defined.

Update the Port Configuration:

Replace the ports entry with expose. This means internal containers can reach the service but it won't be accessible from the host machine or outside the defined network.

Example Configuration: Here is what your updated docker-compose.yml file will look like:

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

Explanation of Key Components

expose: This property declares the port on which the service listens inside the Docker network, making it available only to other services within the same network—not to the host or external networks.

networks: This allows you to define custom networking for your containers, enhancing security by keeping services isolated.

ipv4_address: You can assign a static IP to your service inside the produced bridge network. This assures that only internal services can communicate with it using this fixed IP.

Final Thoughts

By implementing the changes above, you've successfully isolated your Docker container from the host network using Docker Compose. This enhances the security of your application by restricting access only to specified internal services.

As a best practice, always review your network configurations to ensure they meet your security needs while maintaining functionality.

Conclusion

With the right configuration in place, you can confidently deploy your Docker containers knowing they are properly isolated. Make sure to share these best practices with fellow developers to promote security awareness in containerized applications!

If you have any further questions or need clarification on any points, feel free to leave a comment below.