Docker Tutorial

Docker Tutorial provides basic and advanced concepts of Docker. Our Docker Tutorial is designed for both beginners as well as professionals.

Docker is a centralized platform for packaging, deploying, and running applications. Before Docker, many users face the problem that a particular code is running in the developer's system but not in the user's system. So, the main reason to develop docker is to help developers to develop applications easily, ship them into containers, and can be deployed anywhere.

Docker was firstly released in March 2013. It is used in the Deployment stage of the software development life cycle that's why it can efficiently resolve issues related to the application deployment.

What is Docker?

Docker is an open-source centralized platform designed to create, deploy, and run applications. Docker uses container on the host's operating system to run applications. It allows applications to use the same Linux kernel as a system on the host computer, rather than creating a whole virtual operating system. Containers ensure that our application works in any environment like development, test, or production.

Docker includes components such as Docker client, Docker server, Docker machine, Docker hub, Docker composes, etc.

Let's understand the Docker containers and virtual machine.

Docker Containers

Docker containers are the lightweight alternatives of the virtual machine. It allows developers to package up the application with all its libraries and dependencies, and ship it as a single package. The advantage of using a docker container is that you don't need to allocate any RAM and disk space for the applications. It automatically generates storage and space according to the application requirement.

Virtual Machine

A virtual machine is a software that allows us to install and use other operating systems (Windows, Linux, and Debian) simultaneously on our machine. The operating system in which virtual machine runs are called virtualized operating systems. These virtualized operating systems can run programs and preforms tasks that we perform in a real operating system.

Containers Vs. Virtual Machine

Why Docker?

Docker is designed to benefit both the Developer and System Administrator. There are the following reasons to use Docker -

• Docker allows us to easily install and run software without worrying about setup or dependencies.
• Developers use Docker to eliminate machine problems, i.e. "but code is worked on my laptop." when working on code together with co-workers.
• Operators use Docker to run and manage apps in isolated containers for better compute density.
• Enterprises use Docker to securely built agile software delivery pipelines to ship new application features faster and more securely.
• Since docker is not only used for the deployment, but it is also a great platform for development, that's why we can efficiently increase our customer's satisfaction.

Advantages of Docker

There are the following advantages of Docker -

• It runs the container in seconds instead of minutes.
• It uses less memory.
• It provides lightweight virtualization.
• It does not a require full operating system to run applications.
• It uses application dependencies to reduce the risk.
• Docker allows you to use a remote repository to share your container with others.
• It provides continuous deployment and testing environment.

Disadvantages of Docker

There are the following disadvantages of Docker -

• It increases complexity due to an additional layer.
• In Docker, it is difficult to manage large amount of containers.
• Some features such as container self -registration, containers self-inspects, copying files form host to the container, and more are missing in the Docker.
• Docker is not a good solution for applications that require rich graphical interface.
• Docker provides cross-platform compatibility means if an application is designed to run in a Docker container on Windows, then it can't run on Linux or vice versa.

Docker Engine

It is a client server application that contains the following major components.

• A server which is a type of long-running program called a daemon process.
• The REST API is used to specify interfaces that programs can use to talk to the daemon and instruct it what to do.
• A command line interface client.

Prerequisite

Before learning Docker, you must have the fundamental knowledge of Linux and programming languages such as java, php, python, ruby, etc.

Audience

Our Docker Tutorial is designed to help beginners and professionals.

Problem

We assure that you will not find any difficulty while learning our Docker tutorial. But if there any mistake, kindly post the problem in the contact form.