As a platform-as-a-service tool, Docker was developed to make it simpler for developers and coders to create, deploy, and run applications by using containers. Containers allow you to bundle an application with everything it needs, such as executables, libraries, environment variables, configuration files and other dependencies, and deploy it as one package.
Why use Docker?
By using Docker, it enables you to quickly deploy server environments in these containers.” Keep in mind that while Docker does use virtualization technology in the Linux kernel, it does not create virtual machines. When using an operating system such as MacOS or Windows, you will have to run it on a virtual machine.
Docker containers are a lightweight solution to Virtual Machines, and it uses the host OS, whether it’s MacOS or Windows. You do not have to pre-allocate any RAM to the Docker container since it will take it as and only when required. The advantage is that you don’t have to worry about wasting resources.
Prior to Docker, the typical way to deploy applications was through Virtual Machines (VMs) and there were many drawbacks with them. Since VMs are not lightweight, you had to run two or three VMs on a high-performing server. On the same server, at least 10 Docker containers can be launched. So it is uses less resources than a VM.
How a Docker Container Works?
Docker containers may seem complex, but it’s a rather simple process:
- After you first write the project code in a Docker file, you can build an image from that file.
- That image contains your entire project code.
- Run this Docker Image to create as many containers as you need.
- The image can be uploaded on a Docker hub—a cloud repository for all of your Docker Images.
- This Docker Image now resides on the Docker hub and can be accessed by other teams in your organization such as Quality Assurance or Product Development, etc.
This prevents you from wasting resources and also ensures that the computing environment in other developer’s computers are replicated as well. With VMs, you had to start all over and build it from scratch every time.
Earning Your Docker Certification
In today’s highly competitive job market, Docker skills are in high demand. A Docker certification is designed to validate your technical skillset and knowledge. This Docker certification will provide you with a boost up for your career with real-life examples. This course will benefit all IT professionals who actively develop, test, and/or deploy code. It gives the best learning experience for Docker technologies like Docker Compose, DockerHub, Docker Swarm, Docker Containers. The focus of this course is to introduce containerization to help you gain insight into various aspects of containerization technology through demonstrations of the concept.
Additionally, you will learn how to create and use containers on a Docker platform. After you complete this course you’ll have the requisite skills and confidence to go forth and create your own flexible application environments with Docker Compose.