Docker: What You Need To Know About Containerization
In the past few years, containerization has been a buzzword in IT circles. As the IT industry evolves, so do the technologies and skills needed to keep up with it. One of the most popular tools to have emerged in recent years is Docker. The term “containers” has been around for a lot longer than you might realize, but containers are now being used more widely than ever before thanks to improvements in technology that allow them to be more accessible. Docker containers have been a hot topic in IT and tech jobs for at least half a decade.
But what is it and why should you care? This blog post will discuss Docker containers and how they are impacting the world of modern application development. We’ll look at what containerization is, why it’s important, and some of the best practices for creating your containers.
What is containerization?
In the Docker world, a container is a unit of software that performs one task. It contains everything that is needed to run an application or service on a single machine—the code, runtime, system tools, system libraries, and settings. In this sense, it’s similar to a virtual machine (VM), but containers are more portable and efficient because they don’t need to emulate hardware. Containers can be deployed on any type of infrastructure: physical servers in a data center, virtual machines in the cloud, or hybrid environments.
Docker has emerged as the leading tool for containerizing applications. Docker makes it easy to build consistent development and staging environments by allowing developers to use exactly what they need for their development environment inside of Docker containers. Docker containers do not need to be deployed with a unique server like VMs. Instead, each Docker container can run on top of any service that supports Docker containers. Docker makes it easy to define and change application requirements at development time and then deploy the code to any infrastructure (a compliant platform) without installing software, making changes, or recovering from installation failure. Docker also creates tech jobs that allow the integration of best practices for building and deploying your applications as well as an app store where developers can share their Docker images with the world.
Why is Docker so popular?
Docker takes advantage of low-level virtualization capabilities built into many modern processors as well as the Linux Kernel Virtual Machine (KVM). In addition, Docker has been designed from the ground up to be lightweight and efficient. Docker containers, applications, and associated files can be easily moved across systems or run wherever Docker runs due to Docker’s Docker apps don’t need any installation, they are self-contained and portable. This makes Docker ideal for testing new software built on a developer’s workstation and then deploying the same Docker app to the company’s CI/CD system for further automated testing or integration with testing automation tools like Selenium.
Docker benefits everyone in the modern application development lifecycle including developers, testers, operations teams, business stakeholders, and users. Many large companies have moved their products to Docker because of these benefits:
Portability – Deploying Docker containers anywhere means that all your team members can be sure that they are getting the same application stack in development, testing, and production. Docker containers can be easily moved to Docker appliances (e.g., Docker on AWS or Docker on Azure), hosted in your public cloud, or run locally using Docker’s free VirtualBox/VMware/Microsoft Hyper-V virtualization products.
Consistency – Docker also enables everyone to use the same toolset when working with their application stacks. Everyone gets the latest version of the tools used by other members of their team when they build new Docker images or update existing ones. Alerts can notify everyone if someone uses an older version of a tool that may no longer work properly with the updated Docker apps.
Application Development – Docker provides the means to solve problems in application development. Docker can run multiple instances of your application to speed up testing time or spin up Docker containers that mimic the production environment (e.g., scale-out vs. scale-up). Docker also makes it easy to define and change requirements at development time so all stakeholders can agree on what code will be released when without having too many integration issues later on during testing or deployment.
Application Testing – Docker provides a way for developers, testers, and operations teams to work collaboratively while developing new features or updating existing ones. Docker apps are self-contained which makes it easy for everyone involved in testing Docker apps to get started without worrying about other software that might have been installed previously since Docker apps are self-contained. Docker containers can also be easily spun up to mimic the production environment to speed up testing time for Docker apps.
Deployment – Docker also provides a way for developers and testers to integrate new changes into existing application stacks. Docker containers can be tested with an automated test suite, approved by the business stakeholders, and then easily deployed to any infrastructure (a compliant platform) without installing software or making changes to existing running Docker images.
· Application Release – Finally, Docker provides integrated best practices for deploying applications as well as an app store where users can quickly find and deploy their favorite apps built using Docker like Grafana, Jenkins, and Redis Labs.
Docker is a great technology that enables a new level of collaboration between a business’ IT teams by enabling everyone to use the same tools for application development and deployment. The ability to easily integrate testing automation into CD pipelines reduces friction when deploying updates or building new features which ultimately allows developers to deliver high-quality software faster than ever before.
Docker is not just another technology that can be used to deploy applications. Docker provides features that enable teams of all sizes to better collaborate, integrate testing automation into CD pipelines, and ultimately reduce friction when releasing software.
Here is an overview of jobs related to Docker: https://jobtensor.com/Docker-Jobs