A beginner’s guide to networking in Docker

A beginner’s guide to networking in Docker

To create a network we use the $ docker network create command. The --driver or -d flag sets the driver to be used which defaults to bridge if not provided. We can also control the subnet (IP pool) using the --subnet else Docker will configure it automatically.

In this lesson, we are going to understand how host-to-container and container-to-container communication takes place. Since this won’t be an advanced guide, we are only going to explore the surface of networking in Docker.

In the previous lessons, we learned a great deal about Docker, Dockerfile, Docker images, and Docker containers. We understood the isolated nature of a Docker container and how to connect with a running container using -p (or _`--publish_) flag to map a host port to a container port for network access or -v (_or __--volume_`) flag to access files of a container from the host.

In this lesson, we are going to talk about the networking aspect of the containerization process. We will explore what different options Docker gives us to control the network of a Docker container and how we can use them depending on our needs.

Docker network is a medium through which a Docker container can talk to its host, other containers on the host, or any other machines on or outside the host’s network. To configure networks, we use the $ docker network command that provides us subcommands such as lscreateattach to configure networks and containers’ relationship to them.

When you install Docker for the first time, we get three types of networks out of the box. You can use the $ docker network ls command to see them.

containers docker-networking networking docker programming

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