Why Docker is so important

Docker has become one of the standard tools for modern application development and deployment, and it is also one of developers' favorite portable container solutions. But why is Docker so important? What can it do? Why is it so popular? This article will answer these questions.

How does Docker work?

Before understanding why Docker is so important, we need to understand how Docker works.

First of all, we need to know that Docker is a containerization tool. Docker's container is a portable running environment that can contain applications and their dependencies, and is ultimately packaged into a container image. This way, the container image can run in any environment and since it contains all applications and their dependencies, they are not affected by changes in the environment.

What is the difference between Docker containers and virtual machines?

When comparing Docker containers and virtual machines, the most important difference is the presence of the virtualization layer. A virtual machine can emulate the entire operating system, including the kernel. Each virtual machine can have its own resources such as operating system, memory and disk. This means that the virtualization layer requires more resources, so creating a virtualized environment is more cumbersome than creating a containerized environment.

In contrast, Docker containers have no virtualization layer and they share the kernel of the host operating system. This means that Docker containers can share computer memory and disk space when running on the same host. This approach makes both container creation and deployment faster and more efficient.

Why choose Docker?

Docker containers have more advantages than virtual machines.

First of all, Docker containers are a portable solution that can run anywhere. The Docker platform is an open containerization platform that allows developers to package their applications into a container so they can run anywhere.

Secondly, Docker containers are very fast to create and deploy. Container images already contain the application and its dependencies, so creating and deploying a container takes seconds instead of minutes, allowing developers to deliver more solutions in less time.

Finally, Docker containers are more secure. Since they share the kernel of the host operating system, the attack surface is reduced and we can restrict the containers to the least privileges, thus increasing the security of the application.

Conclusion

In the increasingly rapidly developing field of Docker, it has become one of the standard tools for modern application development and deployment. Docker container images are a portable solution that improves development efficiency while improving application portability and security. If you want to stay competitive in modern application development and deployment, learning Docker container technology is definitely a good option.

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