Docker Container Software And Architecture

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• Last Updated October 18, 2017

What is Docker?

Docker is a software company based out of San Francisco. It provides a Docker Software that automates the deployment of all the source codes inside software containers.

A container is a package of a piece of software that includes everything needed to run it, code, system tools, libraries and settings. It can run on Linux, windows and its related apps and other centralized software.

What does Docker do?

Cloud computing has changed the programmable infrastructure for an organization. It brought the automation into the software development lifecycle right from resource allocation to operate, configure, deploy the applications along with monitoring the entire process. This led to the DevOps culture where developers are making the entire application as a single Docker Image. This image is then picked up by various departments of software development cycle like– development, testing, and production.

                                                Checkout Docker Interview Questions

What is the need for Docker?

Initially, every software developer is assigned a system for doing his work and that system is exclusively for him. The times have changed that every developer is able to run complex applications off of a virtual machine on their laptops or on common developer server in the cloud. Docker containers are isolated yet share the same kernel and core operating system files. By  Docker, one can build distributed systems that are portable with lightweight application runtime that has packages & tools sharing commonly on a cloud-based server for applications automating their workflows fastly.

What are the special features of Docker Platform?

1. The detached technique of containers allows you to run many containers simultaneously on a given host. 
2. Lightweight Containers don’t need any hypervisor. They run directly within the host machine’s kernel. 
3. Docker provides tools and a platform to manage the software development lifecycle by using Docker containers one can 
4. Develop an application and other components.
5. One can have a central unit for distributing and testing the application.
6. One can deploy the application into your production environment that can be a local data center, a cloud provider, or much bigger
7. It enables you to run different and multiple holders on a single host. 
8. One can run any number of compartments on a given equipment.
9. One can run the Docker compartments inside the host machines.

Related Page: Learn More About Docker Architecture

What are the benefits of Docker for developers?

• The developers write code locally and share their work with colleagues 
• They can push their applications into a test environment easily.
• One can execute the tests on code automated and manually.
• Bug can be fixed directly in the development environment and redeploy them for validation.
• When testing is complete, getting the fix to the customer is as simple as pushing the updated image to the production environment.

Learn Docker Tutorial

The Docker Architecture

Docker Architecture is a client-server architecture with Docker Engine which is a client-server application. Docker Engine contains a server, REST API and a command line interface (CLI) client.

The CLI uses the Docker REST API to communicate with the Docker daemon through scripting or CLI commands. The daemon creates and manages Docker objects like images, containers, networks.

Simple steps:

1. The Docker client interacts to the Docker daemon.
2. The Docker daemon builds, runs, and distributes the application on Docker containers. 
3. The Docker Container creates an image which is a read-only template with instructions for creating a Docker container.
4. A Docker registry stores Docker images.

The below fig. Illustrates the process

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