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This article mainly explains "what Docker is and what its principles are." The explanation in this article is simple and clear, easy to learn and understand. Please follow the ideas of Xiaobian and go deep into it slowly to study and learn "what Docker is and what its principles are."

What is Docker?

Due to its many novel features and the openness of the project itself, Docker has gained the favor of many vendors in a short time. Docker is a free software package that performs operating system-level virtualization, called containers, to support the creation and use of Linux containers.

Docker allows developers to package their applications and dependencies into a portable container and distribute them to any Linux machine, or virtualize them. Docker containers use sandboxing entirely, and there are no interfaces between them, which ensures security between containers.

What is Docker Principle?

Docker technology uses the Linux kernel and kernel features to separate processes so that they run independently of each other. This independence is exactly what containers are for; they can run multiple processes and applications independently, allowing infrastructure to function more fully while maintaining the security of individual systems.

Container tools, including Docker, provide an image-based deployment model. This makes it easy to share an application or service set with its dependencies across multiple environments. Docker can also automatically deploy applications within this container environment (or combine multiple processes to build a single application).

Moreover, because these tools are built on Linux containers, Docker is both easy to use and unique-it provides users with unprecedented access to applications, rapid deployment, and version control and distribution capabilities.

Benefits of Docker containers Modularity

Docker's containerization approach focuses heavily on the ability to capture parts of an application individually for updates or fixes without stopping the entire application. In addition to this microservices-based approach, you can share processes across multiple applications in a similar way to service-oriented architecture (SOA).

Layers and Mirrors Version Control

Each Docker image file contains multiple layers. These layers combine to form a single mirror image. Each time the mirror changes, a new mirror layer is created. Each time the user issues a command (such as run or copy), a new mirror layer is created.

Docker reuses these layers to build new containers, thereby helping speed up process builds. Mirrors share intermediate variations, further increasing speed, scale, and efficiency. Version control is an inherent capability of the mirror layer. Every time a new change occurs, you get a built-in change log that gives you total control over container mirroring.

rollback

Rollback is perhaps the layer's most noteworthy feature. Each mirror has multiple layers. For example, if you don't like the iterated mirror version, you can roll back to the previous version. This capability also supports agile development methodologies, helping to continuously implement integration and deployment (CI/CD), making it a reality at the tool level.

rapid deployment

Getting new hardware up and running, deploying it, and going live used to take days. The effort and cost involved are often overwhelming. Docker-based containers reduce deployment times to seconds. By building containers for each process, you can quickly apply these similar processes to new applications. And because containers can be added or moved without booting the operating system, deployment time is significantly reduced. In addition, thanks to this deployment speed, you can easily and cost-effectively create and destroy container-created data.

Docker technology is therefore a more granular, controllable, microservices-based technology that can provide greater efficiency value to businesses.

Thank you for your reading. The above is the content of "What Docker is and what its principles are." After studying this article, I believe everyone has a deeper understanding of what Docker is and what its principles are. The specific use situation still needs to be verified by practice. Here is, Xiaobian will push more articles related to knowledge points for everyone, welcome to pay attention!

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