With the continuous in-depth development of enterprise digitization process , Cloud native technology has become a hot topic in the industry . The so-called cloud native , In containers 、 Microservices 、DevOps Based on technology , Provide a platform and system for distributed deployment and unified management of applications . Cloud primitives are a collection of ideas and tools . From its conceptual definition, we can see , Container technology is the cornerstone of cloud nativity . Developers working in the cloud native domain , If you don't know and master container technology , It's like trying to build a high-rise building on a floating sand dike .

What is a container

Before introducing why we need containers , Please remember your first Hello World Birth history of program . After all our hard work , Solve various local development tool configurations ( compiler , Environment variables and so on ) After the question , Finally see Hello World Output , The joy is self-evident , But we will never forget the frustration and helplessness when encountering various environmental configuration problems .

The author is based on local deployment (On-Premises) I have worked in the field of enterprise management software for more than ten years , I've encountered some applications of the same version , It can run normally on the development machine and testing machine , The thorny problem of failure after deployment to production environment , Finally, after investigation , These problems are caused by the difference of operating environment .

And container technology as a lightweight 、 Portable and self-contained software packaging technology , Make the application run in the same way almost anywhere . Using container technology , Developers create and test containers in their own local development environment , No need to modify the virtual machine in the production system 、 Running on physical server or public virtual machine , Thus, it can completely avoid all kinds of running problems that may occur due to the difference of running environment .

Beginners understand container technology , It can be downloaded from Containers Start with the literal meaning of the word . Imagine a container in real life . We need to transport a batch of goods from one place to another , Just pack the goods into containers according to the standards , There will be no interaction between containers , The container doesn't care what the fruit is in the container , Clothes or electronics , Therefore, the packaging methods of these goods follow the standardized regulations . When these containers are packed , You can use general means of transportation , Such as cars and cargo ships for transportation . After arriving at the destination , Then open the container in a standardized way , Take out the goods inside and use .