What is Containerization? Docker & Kubernetes Explained

Software deployment across various computing platforms has always been a headache for software developers. While the code can function without problems on a developer’s laptop, once deployed to a test or production server, it might not run due to incompatible operating systems, lack of dependencies, or different software versions. 

The solution for this issue comes with the modern cloud-based architecture in the form of containerization- a lightweight technology that allows packaging code with everything it requires to be executed successfully regardless of location.

Getting to the Basics: What is Containerization?

Containerization is a software deployment process in which all necessary elements required by an application, including code, runtime, system tools, libraries, and configurations, are packed in a single entity called a container.

The main ideas behind containerization technology include:

• Operating System Virtualization
• Environment Consistency
• Resource Utilization

Role of Docker: Creation and Execution of Containers

Docker is the platform that brings modern containerization to life for developers to build and run their applications in an easy way. Some of the key aspects of Docker include:

• Creating Images: Docker enables developers to create lightweight and reusable images of their applications using a few configuration files.
• Execution of Containers: Docker creates isolated environments of applications quickly on one computer or server.
• Development on Local Computers: It is very easy for developers to set up a local database and microservices.

Although Docker does extremely well in the creation and execution of containers on one computer, coordination of hundreds of containers on different servers becomes necessary.

The Role of Kubernetes: Container Orchestration at Scale

Once the applications transform to microservices architecture, it will no longer be possible to manage the container instances manually. At this point, Kubernetes will come into play as the automation process for orchestration.

The following are important characteristics of Kubernetes:

• Auto-scaling: Automation process of scaling either the number of containers based on the demand for traffic.
• Self-healing: Periodically monitors the container instances and replaces unresponsive nodes by restarting the failed ones.
• Load balancing: Even distribution of network traffic among containers.

The two technologies, Docker and Kubernetes, do not compete but rather work together; Docker encapsulates the application containers, and Kubernetes performs the orchestration process.

Also Read: How Automation is Changing the Future of Work?

Conclusion

In contemporary development practices, it becomes mandatory to have fast deployment cycles. With the use of containerization technology together with tools like Docker and Kubernetes, one can create application containers.