container technology

The technology that effectively divides the resources of a single operating system into isolated groups to better balance conflicting resource usage requirements among isolated groups is container technology.

Container technology refers to creating isolated groups on the physical host operating system, dividing the resources on the physical host operating system into each group, and balancing the conflicting resource usage requirements among the groups.

Container technology is better than traditional virtualization technology to run more workloads on the same hardware. Thanks to the powerful functions of the container engine, various applications can share the resources of the physical host operating system while remaining independent from each other.

1. Docker：

- Docker is an open source containerization platform that allows developers to package applications, libraries, and dependencies into a container to form a portable application unit.

- A Docker container is created based on an image, which contains the application and everything it needs to run . This enables containers to run in any environment that supports Docker, be it development, test or production.

- Docker provides a simple command-line interface and a graphical user interface, making it easy to create, deploy, and manage containers.

2. Kubernetes（K8s）：

- Kubernetes is an open source container orchestration and management platform for automating the deployment, scaling, and management of containerized applications.

- Kubernetes provides resource management, automatic expansion, load balancing, automatic recovery and other functions, which can easily handle large-scale containerized applications.

- Using Kubernetes, administrators can define the scale of the application, the number of replicas, resource requirements, etc., and let Kubernetes automatically manage the deployment and operation of the application.

Advantages of container technology include:

- Rapid Deployment: Containers can be started and stopped in a short time, enabling rapid application deployment and updates.

- Environment isolation: Each container runs in an independent environment, avoiding dependency conflicts and interference between applications.

- Resource utilization: Containers share the kernel of the host operating system, saving hardware resources and improving resource utilization.

- Portability: Containers behave the same in different environments, making migration from development to production easier.

- Scalability: Container orchestration tools such as Kubernetes can easily manage scaling to hundreds or even thousands of containers.

Docker and Kubernetes

are essential tools for modern application deployment and management, and they play a key role in enabling application containerization, automation, and high availability.

What are the main application scenarios of containers?

The birth of container technology solves the problem of technical implementation of the PAAS layer. Container technology is mainly used in the following scenarios:

1. Continuous integration and continuous deployment (CI/CD), continuous integration (CI) and continuous deployment (CD) are the basis of modern operation and maintenance, developers and operation and maintenance personnel communicate continuously, CI/CD creates a real-time feedback mechanism , continuously transferring small iterative changes, speeding up changes and improving quality.

2. Accelerate the process of micro-service application architecture. The single code base using the waterfall model development method is transformed into a loosely coupled service that is independently developed and deployed. Other service components can be easily shared, deployed, updated, and instantly expanded. Container technology is used in traditional applications, improving the security and portability of existing applications.

3. Reduce costs and increase efficiency, optimize resource utilization. Containers are a lightweight technology for packaging and isolating applications, so Docker allows multiple workloads to run on the same physical or virtual server to reintegrate IT resources and ensure efficient use of resources.

As the cornerstone of cloud-native development, container technology has become a technical trend in the field of cloud computing. The technology is iteratively updated quickly and widely used. From Docker to K8S, Rancher, and Podman, combining commercialization and open source, container technology is becoming the key to unleash cloud value. shortest path.