Lesson 4 of 11By Sana Afreen
Last updated on Oct 30, 20209293In the Docker world, Network admins have a huge responsibility of understanding the network components found in virtualization platforms like Microsoft, Red Hat, etc. But, deploying a container isn’t simple; it requires strong networking skills to configure a container architecture correctly. To solve this issue, Docker Networking was introduced.
Below are the topics that will be covered in the article:
Before understanding Docker Networking, let’s quickly understand the term ‘Docker’ first.
Docker is a platform that utilizes OS-level virtual software, to help users to develop, deploy, manage, and run applications in a Docker Container with all their library dependencies.
Note: Docker Container is a standalone package that includes all the dependencies (frameworks, libraries, etc.) required to execute an application.
Now, let’s dig into what Docker networking is, and then understand its advantages.
Docker networking enables a user to link a Docker container to as many networks as he/she requires. Docker Networks are used to provide complete isolation for Docker containers.
Note: A user can add containers to more than one network.
Let’s move forward and look at the Advantages of networking.
Some of the major benefits of using Docker Networking are:
For a more in-depth understanding, let’s have a look at how Docker Networking works. Below is a diagrammatic representation of the Docker Networking workflow:
Functionalities of the different components:
Now that you know how Docker networking works, it is important to understand the container network model.
This concept will help you to build and deploy your applications in the Docker tool.
Let’s discuss the components of the container network model in detail:
So, those were the key concepts in the container network model. Going ahead, let’s have a look at the network drivers.
Docker supports networking for its containers via network drivers. These drivers have several network drivers.
In this article, we will be discussing how to connect your containers with suitable network drivers. The network drivers used in Docker are below:
Let’s discuss some of the important networking commands that are widely used by the developer teams.
docker network ls
The above command displays all the networks available on the Docker ecosystem
$ docker network connect multi-host-network container
In the command shown above, You can also use the docker network option to start a container and immediately connect it to multiple host networks.
$ docker network connect --IP 10.10.36.122 multi-host-network container
In the above command, a user can specify the IP address (for example, 10.10.36.122) that he/she wants to assign to the container interface.
$ docker network connect --alias db --alias mysql multi-host-network container2
In the above command, we have specified Aliases to define new commands and to rectify incorrect input
$ docker network disconnect multi-host-network container1
In the above command, the disconnect option is used to stop the running docker containers on multiple host network
$ docker network rm network_name
In the above command, the rm option is used to remove a network from the Docker ecosystem
$ docker network rm 3695c422697f network_name
The above command can be used when a user wants to remove multiple networks at a time
$ docker network prune
The above ‘prune’ command can be used when a user wants to remove all unused networks at a time
Enroll for the Docker Certified Associate (DCA) Training Course and learn core Docker technologies such as Docker Hub, Docker Compose, and more.
That concludes the Docker Networking article. In this write-up, we learned what Docker and Docker Networking are, some of its benefits, how Docker networking works, the Container network model, network drivers, and finally, we saw some of the basic Docker networking commands.
If you'd like to get a good understanding of the Docker tool, Simplilearn can solve your problem. The Docker In-Depth Training Course will help you learn all about Docker. With this certification, you will be able to learn hands-on experience on how to create flexible application environments with Docker.
Do you have any queries for us on this topic? Please feel free to put it in the comments section of this article, our experts will get back to you at the earliest!
Sana Afreen is a Senior Research Analyst at Simplilearn and works on several latest technologies. She holds a degree in B. Tech Computer Science. She has also achieved certification in Advanced SEO. Sana likes to explore new places for their cultures, traditions, and cuisines.
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