Docker Networking: Workflow, Networking Basics, Networking Commands

Introduction

In this age of virtualization, network administrators no longer work only on traditional networking components such as routers, LAN/ WAN components and switches. They have to work on network components on virtualization platforms. The whole IT industry is interested in the concept of containerization, where strong networking skills are essential.

As Docker is one of the most used containerization software, Docker networking skills are important for configuring a container. At present, more than 12,000 companies use Docker containers for shipping their applications. These companies include JPMorgan Chase, ThoughtWorks and Neudesic.

In this article, we will learn about the introduction to Docker, the basics of Docker networking.

Let us first understand the fundamentals of Docker.

#docker networking #docker

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Docker Networking: Workflow, Networking Basics, Networking Commands

Introduction

In this age of virtualization, network administrators no longer work only on traditional networking components such as routers, LAN/ WAN components and switches. They have to work on network components on virtualization platforms. The whole IT industry is interested in the concept of containerization, where strong networking skills are essential.

As Docker is one of the most used containerization software, Docker networking skills are important for configuring a container. At present, more than 12,000 companies use Docker containers for shipping their applications. These companies include JPMorgan Chase, ThoughtWorks and Neudesic.

In this article, we will learn about the introduction to Docker, the basics of Docker networking.

Let us first understand the fundamentals of Docker.

#docker networking #docker

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

Top 24 Docker Commands Explained with Examples

In my previous blog post, I have explained in detail how you can Install Docker and Docker-compose on Ubuntu

In this guide, I have explained the Top 24 Docker Commands with examples.

Make sure you have sudo or root privileges to the system.

Docker Commands

1. The command to check the version of Docker installed.
2. To look/search for available docker images from the Docker registry.
3. To pull docker images from the Docker registry.
4. Listing all the docker images
5. Creating / Running docker container from Docker image.
6. To list the actively running docker containers.
7. To list all the docker containers
8. To stop a Container
9. To start a Container
10. To restart a Docker container
11. To login to running Docker container
12. To delete the stopped Docker containers
13. To delete Docker images from the Local system
14. To check logs of a running Docker container
15. Killing docker containers
16. Log in to Docker Hub registry (hub.docker.com)
17. Removing docker hub registry login from the system.
18. Check active resource usage by each containers
19. Rename a Docker container
20. To display system wide information of Docker
21. Inspecting a Docker container
22. Building docker images from Docker file
23. Creating new docker images from a Container
24. Pushing Docker images from Local to Docker registry.

#docker #docker-command #containers #docker-compose #docker-image

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

List all containers in Docker(Docker command)

We can get a list of all containers in docker using docker container list or docker ps commands.

List Docker Containers

To list down docker containers we can use below two commands

• docker container list
• docker ps

docker container ls command introduced in docker 1.13 version. In older versions we have to use docker ps command.

List all Containers in docker, using docker ls command

The below command returns a list of all containers in docker.

docker container list -all

or

docker container ls -all

List all containers in docker, using docker ps command

In older version of docker we can use docker ps command to list all containers in docker.

$ docker ps -all

or

$ docker ps -a

List all Running docker containers

The default docker container ls command shows all running docker containers.

$ docker container list

or

$ docker container ls

or

To get list of all running docker containers use the below command

$ docker ps

List all stopped docker containers command

To get list of all stopped containers in docker use the below commands

$ docker container list -f "status=exited"

or

$ docker container ls -f "status=exited"

or you can use docker ps command

$ docker ps -f "status=exited"

List all latest created docker containers

To list out all latest created containers in docker use the below command.

$ docker container list --latest

Show n last created docker containers

To display n last created containers in docker use the below command.

$ docker container list --last=n

#docker #docker-container #docker-command