Shulou(Shulou.com)06/03 Report--

What is a container?

The word container, when you first look at it, may be this thing in your mind: bottles and cans, water, other things.

Whatever it is, generally speaking, the first impression of the container is "packing".

So what is the concept of container technology that we are going to talk about today? In fact, the container technology in IT is the literal translation of the English word Linux Container. The word container has the meaning of container (mainly partial to container). However, in the Chinese environment, we have to communicate and teach, and it is a bit of a mouthful to translate it into "container technology", so combined with the Chinese people's spelling habits and cultural background, we prefer to use the word container. However, if you want to have a visual understanding of Linux Container technology, it would be better to read it as a container. We know that the container in the seaside wharf is used to carry goods. It is a kind of steel box standardized according to specifications. Containers are characterized by their uniform format and overlapping layers, so they can be placed in a large number of specially designed ocean-going ships (there was no concept of containers in early shipping, when the goods were disorganized, which affects the efficiency of shipping and transportation). With containers, it is faster and more convenient to provide cheap transportation services for manufacturers.

Main application scenarios of containers

In fact, the birth of container technology mainly solves the technical implementation of PAAS layer. Technologies like OpenStack and Cloudstack solve the problem of the IAAS layer. People have probably heard a lot about IAAS layer and PAAS layer, and I won't describe their differences and characteristics here. So what scenarios are container technology mainly used in? At present, the mainstream are as follows:

1. Containerization of traditional application containers can not only improve the security and portability of existing applications, but also save costs.

Every enterprise environment has an older set of applications to serve customers or automate business processes. Even large-scale monolithic applications can benefit from Docker and reduce costs through the enhanced security and portability features of container isolation. Once containerized, these applications can extend additional services or shift to a micro-service architecture.

two。 Continuous integration and continuous deployment (CI/CD) accelerates application pipeline automation and application deployment through Docker, resulting in at least 13 times faster delivery.

The modern development process is fast, continuous and capable of automatic execution, and the ultimate goal is to develop more reliable software. Through continuous integration (CI) and continuous deployment (CD), the IT team was able to integrate new code each time the developer checked in the code and tested it smoothly. As the basis for developing an operations approach, CI/CD creates a real-time feedback loop mechanism that continuously transmits small iterative changes to speed up changes and improve quality. The CI environment is usually fully automated, triggering the test with the git push command, automatically building a new image when the test succeeds, and then pushing it to the Docker mirror library. With subsequent automation and scripting, the newly mirrored container can be deployed to the rehearsal environment for further testing.

3. Microservices accelerate the modernization of application architecture.

The application architecture is changing from a single code base based on waterfall model to a loosely coupled service developed and deployed independently. Thousands of such services are connected to each other to form applications. Docker allows developers to choose the tool or technology stack that is most appropriate for each service, isolating the service to eliminate any potential conflicts, thus avoiding "hellhole matrix dependency". These containers can be easily shared, deployed, updated, and instantly extended independently of other service components of the application. The end-to-end security function of Docker enables the team to build and run a micro-service model with the lowest permissions, and the resources needed for the service (other applications, confidential information, computing resources, etc.) will be created and accessed at the right time.

4. IT infrastructure optimization makes full use of infrastructure and saves money.

Docker and containers help optimize the utilization and cost of the IT infrastructure. Optimization means not only cutting costs, but also ensuring the effective use of the right resources at the right time. Containers are a lightweight way to package and isolate application workloads, so Docker allows multiple workloads to run without conflict on the same physical or virtual server. Enterprises can integrate data centers and integrate acquired IT resources to achieve mobility to the cloud while reducing operating system and server maintenance.

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