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Docker Tutorial

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Docker

What is Docker in Linux?

Docker Architecture

Docker Networking

Docker WORKDIR

Install Docker

Advantages of Docker

Docker Commands

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Exec into docker container

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docker-compose up

Dockerfile

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Docker Commands Cheat Sheet

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Persistent Storage Docker

Docker Swarm

What is Docker Swarm?

Docker Swarm Architecture

Interview Questions

Docker Interview Questions

Docker Tutorial

Firstly, let’s talk about what Docker is. “Docker is a computer package with a program that can do operating system level tasks known as Virtualization.” Docker, Inc industrializes Docker.

Docker is a container management service where we can develop our application, package it, deploy and run it with its dependencies in a container. Later we can ship this container easily to execute on other machines.

Why do we need to learn Docker?

Docker was initially released in March 2013, and after that, it has become the catchword for modern technology, which is specially used for Agile-based projects.

We should be clear with the two terms mentioned above Virtualization and Containerization. These two terms are much related to each other.

So, let me first communicate to you what Virtualization is.

Virtualization is a technical term that defines the process of introducing a Guest Operating system on the top priority of a Host operating system in a virtual environment. It gave various advantages like easy maintenance and recovery in case of failure and less cost as it reduced the need for extra hardware resources and infrastructures.

But nothing is perfect; Virtualization also has some failures, which made performance degradation as multiple virtual machines run on the same host. This caused a delay in the booting process, and real-time applications were affected. These drawbacks of Virtualization rose in the evolution of new technology, Containerization.

Now let me tell you about Containerization.

Containerization conveys abstraction to the operating system, not the hardware, like in Virtualization, where there is no Guest OS. Here, Docker containers run by sharing a Linux Kernel, utilize a host’s operating system, interact by sharing needed libraries and resources, use less memory, and less CPU, and take seconds to boot up.

Containerization sets applications as images that comprise everything required to execute them, such as libraries, code, runtime environment, and configurations.

Applications of Docker

  • Docker reduces the development size, providing a smaller operating system footprint through containers.
  • With the help of containers, working seamlessly across applications has become easier for teams across different units such as QA, Operations, and development.
  • Docker containers can be deployed anywhere, on any physical or virtual system like a developer’s laptop, in the cloud, or on the premises.
  • The containers are lightly weighted, so they are scalable easily.

Example

Everything is centered on images in Docker, which is formed with a file system and parameters. For example, let’s execute the following command in Docker.

docker run hello-learning-docker

Here, the Docker command tells the Docker program on the OS that something needs to be done. Again, with the run command, we create an instance of the image known as a container. At last, “hello-learning-docker” represents the image from where the container is made.

Prerequisites

The prerequisite for Docker is that the learners should be aware of the basic ideas of Windows and its different programs available on the Windows operating system.

Also, in this addition, exposure to Linux by the readers would even help for better learning.

Target Audience

The target audience for Docker can be those interested in learning Docker like a container service. This product is adding an influence on the development of new-generation applications and is spreading like wildfire across the industry.

Thus, anyone interested in learning Docker’s all aspects can read its tutorial with practice or visit the official site for Docker www.docker.com.

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