Docker Inspect Format IP Address: A Step-by-Step Guide to Creating an Overlay Network

In our previous posts, we explored how Docker uses VXLAN to tunnel traffic between hosts in an overlay network and how it creates a dedicated namespace for the overlay. Now, let's dive deeper into creating our own overlay network using standard Linux commands.

To begin, create a new network namespace called 'overns' by running the following command: `sudo ip netns add overns`. This will allow us to isolate the containers in this namespace from the rest of the system.

Before proceeding, make sure you have removed all your containers and the overlay network by running: `docker rm -f $(docker ps -aq)` on each of your Docker hosts. This will ensure a clean slate for our new overlay network.

Now that we have our network namespace set up, let's create our own overlay network. In this example, we'll use standard Linux commands to achieve this. We won't be using Docker-specific tools or plugins, which makes the process more transparent and easier to understand.

To start, you need to add a new IP address to your network namespace. You can do this by running: `docker inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' overns`. This command will show you the IP address of the network namespace.

Once you have the IP address, you can use it to connect to containers in this namespace. For example, if you have a container running on IP address 10.1.2.3, you can ping it by running: `ping 10.1.2.3` from within the 'overns' network namespace.

By following these steps, you'll be able to create your own overlay network using standard Linux commands and Docker inspect format IP address. This approach gives you more control over the networking setup and allows for greater customization of your container network architecture.

In our next post, we'll explore more advanced topics related to Docker networking, including how to use Docker's built-in features to manage and configure your networks. Stay tuned!

Docker inspect format ip address