Enable Block Requests to Docker Containers on eth0 Interface for Local Host Access with Tailscale

Enabling Block Requests to Docker Containers on the eth0 Interface with Local Host Access using Tailscale

In this article, we will discuss how to enable block requests to Docker containers on the eth0 interface with local host access using Tailscale. This setup will allow you to securely access your Docker containers from your local machine, making it easier to manage and monitor your containers.

What is Tailscale?

Tailscale is a mesh VPN that makes it easy to securely connect devices, networks, and services. It uses WireGuard, a modern VPN protocol that is simple, fast, and secure, to connect devices. Tailscale simplifies the process of setting up a WireGuard network, making it accessible to users who are not network experts.

Why Use Tailscale with Docker?

When running Docker containers on a machine, it can be useful to have local host access to the containers for management and monitoring purposes. However, exposing the containers directly to the internet can be a security risk. By using Tailscale, you can create a secure connection to the Docker containers without exposing them directly to the internet.

Setting Up Tailscale

To set up Tailscale, you will first need to create an account at tailscale.com. After creating an account, you can download and install the Tailscale client on your local machine and the machine running the Docker containers.

Once the Tailscale client is installed, you can use the command line to join the Tailscale network. On the machine running the Docker containers, you will need to run the following command:

Replace with the auth key provided to you during the sign-up process.

Configuring Docker to Use the Tailscale Interface

By default, Docker will use the eth0 interface to expose containers to the network. To configure Docker to use the Tailscale interface instead, you will need to modify the Docker daemon configuration.

First, stop the Docker service:

Next, edit the Docker daemon configuration file:

Add the following configuration:

This configuration tells Docker to use the tailscale0 interface and assigns it a fixed CIDR block.

Save and close the file, then start the Docker service:

Enabling Local Host Access to Docker Containers

To enable local host access to Docker containers, you will need to modify the container's network settings. When creating a container, you can use the following command to expose the container to the local host:

docker run --network=host --publish=:

Replace with the container's port, and with the local host port. For example, if you have a web server running on port 80 in a container, you could expose it to port 8080 on the local host with the following command:

Blocking Requests to Docker Containers

By exposing the Docker containers to the local host, you have effectively opened up access to the containers. To block requests to the containers, you can use firewall rules.

First, install the Uncomplicated Firewall (ufw):

Next, deny access to all incoming connections:

Then, allow ```python only incoming connections from the local host on the ports you exposed: sudo ufw allow from 127.0.0.1 to any port