What is the difference between Linux and Docker?

What is the difference between Linux and Docker?

Linux is a set of UNIX-like operating systems that are free to use and freely disseminated. It is generally used in back-end services, while Docker is an open source application container engine. The two are used together. , are not the same category, so the two cannot be compared.

Docker’s six major features

1. More efficient use of system resources

docker’s use of system resources The utilization rate is higher, whether it is application execution speed, memory consumption or file storage speed, it is more efficient than traditional virtual machine technology. Therefore, compared with virtual machine technology, a host with the same configuration can often run a larger number of applications.

2. Faster startup time

Traditional virtual machine technology often takes several minutes to start application services, while docker container applications do not need to start a complete operating system because they run directly in the host kernel. , so it can achieve a startup time of seconds or even milliseconds, which greatly saves development, testing, and deployment time.

3. Consistent operating environment

A common problem in the development process is the problem of consistent environments. Due to the inconsistent development environment, test environment, and production environment, some bugs are not included in the development process. Discover. The docker image provides a complete runtime environment except the kernel to ensure environmental consistency, so that problems such as "this code is fine on my machine" will not occur.

4. Continuous payment and deployment

For development and operation and maintenance personnel, the most hopeful thing is to create and deploy once and run it anywhere. (Customize the application image to achieve integration, continuous payment, and deployment. Developers can build the image through dockerfile and combine it with the continuous integration system for integration testing, while operation and maintenance personnel can quickly deploy the image directly in the production environment, or even combine it with Continuous deployment system for automatic deployment). Moreover, using dockerfile makes the image construction transparent. Not only can the development team understand the application running environment, but it also facilitates the operation and maintenance team to understand the conditions required for application operation, helping to deploy the image in a better production environment.

5. Easier migration

Because docker ensures the consistency of the execution environment, application migration is easier. Docker can run on many platforms, whether it is a physical machine, a virtual machine, a public cloud, a private cloud, or even a laptop, and its running results are consistent. Therefore, users can easily migrate applications running on one platform to another platform without worrying about changes in the operating environment causing the application to fail to run properly.

6. Easier maintenance and expansion

The hierarchical storage and mirroring technology used by docker makes it easier to reuse repeated parts of the application, and also makes the maintenance and update of the application simpler. , it becomes very simple to further expand the image based on the basic image. In addition, the Docker team, together with various open source project teams, has maintained a large number of high-quality official images, which can be used directly in the production environment or used as a basis for further customization, greatly reducing the cost of image production for application services.

Recommended tutorial: "Docker"

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