Why use docker containers

Advantages of using docker containers: 1. You can use images to quickly build a standard development environment and quickly deploy code; 2. Efficient resource utilization can achieve higher performance while requiring additional resources. Very low; 3. High compatibility, allowing users to easily migrate applications between different platforms; 4. Automatic and efficient container management can be achieved.

The operating environment of this tutorial: linux5.9.8 system, docker-1.13.1 version, Dell G3 computer.

What is docker?

Docker is an open source application container engine developed and implemented based on the Go language. Using technologies such as Linux kernel's cgroup, namespace, and AUFS-like Union FS, processes are encapsulated and isolated, and virtualization can also be achieved. The isolated process is independent of the host and other isolated processes, so it is also called a container.

Docker containers can be understood as a lightweight sandbox. Each container runs an application. Different containers are isolated from each other, and the containers can also communicate with each other through the network. The creation and stopping of containers is very fast, almost the same as creating and terminating native applications; in addition, the additional requirements for system resources of the container itself are also very limited, far less than that of traditional virtual machines. Many times, there is no problem in treating the container directly as the application itself

Why use docker

For development and operation and maintenance personnel, The most desired effect is that after once created or configured, the application can run normally anywhere and at any time. For algorithm researchers, different algorithms may require different versions of software, so conflicts will exist in the same environment. , Docker's environment isolation can be easily used for configuration in different environments. Specifically, the advantages of docker mainly include the following aspects:

• Fast delivery and deployment

  Using docker, developers can quickly use images Build a standard development environment; after development is completed, testing and operation and maintenance personnel can use the exact same environment to deploy code. As long as the code is developed and tested, it can ensure seamless operation in the production environment. Docker can quickly create and delete containers to achieve rapid iteration.

• Efficient resource utilization

  Running docker containers does not require the support of additional virtualization management programs. Docker is kernel-level virtualization. Higher performance can be achieved with low additional resource requirements.

• Easy migration and expansion

  Docker containers can run on almost any platform, including physical machines, virtual machines, public clouds, Private clouds, servers, etc. also support mainstream operating system releases. This compatibility allows users to easily migrate applications between different platforms.

• Simple update management

  Using Dockerfile to generate images, only small configuration modifications are needed to replace a large number of previous updates. Work, all modifications are distributed and updated incrementally, enabling automated and efficient container management.

Recommended learning: "docker video tutorial"

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