Docker Networking(Bridge-Network)

In this blog we gone see how two containers can communicate with each other using the concept of Docker Networking. One of the most important thing that docker containers and services are so powerful is that you can connect them together.

Let’s imagine you have two application one is front-end application and second one id back-end and you created two containers one for each.

By using these containers you run the application , But the application run individually , now you need to connect the back-end application to front-end. The solution for this is “Docker Networking”.

There are different types of Network Driver

Bridge Network Driver
Overlay Network Driver
Host Network Driver
Macvlan Network Driver
In this blog we’ll focus on the default network driver “Bridge Network Driver”

Bridge Network Driver
A Bridge network can be a link layer betwwen two differant containers. As the name given a bgridge can be hardware and software also. In docker bridge netwoek driver is a software which connect the containers.

Bridge network driver is the default network driver provided by docker.

Bridge network driver does not allow to connect the container which is present on the different host machines. It means that the different containers are able to ping each other.

You can create your own bridge network called “User-Defined Bridge Network”. A user-defined bridge network is superior to the default bridge network. One of the reasons is that whenever you use the default bridge network the containers can communicate using the IP address of other containers and not support the DNS name. Whereas the in bridge network container can communicate using both.

#devops #docker #networking #sre

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Buddha Community

Mikel Okuneva

1602317719

Docker Bridge Network

Hello readers,

This blog will tell you about the docker bridge network. Its use with some basic use cases also how to bridge networks different from the network.

One of the reasons Docker containers and services are so powerful is that you can connect them together, or connect them to non-Docker workloads.

Docker Network

Docker’s networking subsystem is pluggable, using drivers. Several drivers exist by default, and provide core networking functionality:

Type of docker Network :

bridge: The default network driver. If you don’t specify a driver, this is the type of network you are creating. Bridge networks allow your applications to run in standalone containers that need to communicate.
host: For standalone containers, remove network isolation between the container and the Docker host, and use the host’s networking directly. The host is available for swarm services on Docker 17.06 and higher.
overlay: Overlay networks connect multiple Docker daemons together and enable swarm services to communicate with each other. You can also use overlay networks to facilitate communication between a swarm service and a standalone container, or between two standalone containers on different Docker daemons.
macvlan: Macvlan networks allow you to assign a MAC address to a container, making it appear as a physical device on your network. The Docker daemon routes traffic to containers by their MAC addresses.
none: For this container, disable all networking. Usually used in conjunction with a custom network driver.

Let create a bridge network with name alpine-net . Start two alpine container and ping between them to check network connectivity.

$ docker network create --driver bridge alpine-net
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#devops #docker #docker bridge network #docker network

Iliana Welch

1595249460

Docker Explained: Docker Architecture | Docker Registries

Following the second video about Docker basics, in this video, I explain Docker architecture and explain the different building blocks of the docker engine; docker client, API, Docker Daemon. I also explain what a docker registry is and I finish the video with a demo explaining and illustrating how to use Docker hub

In this video lesson you will learn:

What is Docker Host
What is Docker Engine
Learn about Docker Architecture
Learn about Docker client and Docker Daemon
Docker Hub and Registries
Simple demo to understand using images from registries

#docker #docker hub #docker host #docker engine #docker architecture #api

Paris Turcotte

1617904440

A beginner’s guide to networking in Docker

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.

A 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 ls, create, attach 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

Clotilde Lueilwitz

1625982480

Docker Networking: Introduction to Implementation of Docker Networks

Most of us are aware that **Docker container**s and services can connect and other non-Docker workloads. It is called Docker Networking, and as far as this networking is concerned, Docker containers and services need not know that they are deployed on Docker or whether the peers they are connected to are Docker workloads or not. This article will discuss more on the connection between containers and services. Let us begin with the topics that are going to be covered in this article.

What is Docker Networking?
And, what is a Container Network Model (CNM)?
What are various Network Drivers in it?
Bridge Network Driver
None Network Driver
Host Network Driver
Overlay Network Driver
Macvlan Network Driver
Basic Networking with Docker
docker network ls command
Inspect a Docker network – docker network inspect
docker network create
How to connect the docker container to the network?
How to use host networking in docker?
Docker Compose Network
Updating containers in the Docker Compose network
Docker Compose Default Networking

What is Docker Networking?

It can be defined as a communication package that allows isolated Docker containers to communicate with one another to perform required actions or tasks.

A Docker Network typically has features or goals shown below:

Docker Networking Goals

Flexibility – It provides flexibility for various applications on different platforms to communicate with each other.
Cross-Platform – We can use Docker Swarm clusters and use Docker in cross-platform that works across various servers.
Scalability – Being a fully distributed network, applications can scale and grow individually while also ensuring performance.
Decentralized – Docker network is decentralized. Hence it enables the applications to be highly available and spread. So in case any container or host is missing from the pool of resources, we can pass over its services to the other resources available or bring in a new resource.
User – Friendly – Deployment of services is easier.
Support – Docker offers out-of-the-box support, and its functionality is easy and straightforward, making docker networks easy to use.

#docker #docker networks

Phoebe Shanahan

1597515540