04. Some thoughts on enterprise application construction after entering cloud native

When we enter the primary direction of cloud ( In fact, it is a false proposition ), How to build products ?

Before I answer that question , We must first analyze the needs of customers ： Most large-scale enterprises have completed or are promoting it Cloud infrastructure , This is an unclean fact , At the same time, a large number of enterprises have not yet carried out cloud processing , More enterprises just rent the operating environment in specific cloud platforms .

in other words , Enterprise applications have been used for a long time , It will be the coexistence of native cloud and deployment based on specific machines for a long time . How will we promote the transformation of our basic application architecture in the next step ？ Whether the standards can be unified , Even if the other party is providing running machines , It is also required to provide the container operation environment , Uniformly adopt image deployment ？

If you can confirm the above problems , Can make decisions quickly .

It The operation mode does change slowly with sufficient hardware resources ： The physical machine runs ---> Virtual machine running ----> Containerized operation ----> Cloud deployment .

The development mode has not changed much , The essential operating environment has not changed , Just provide basic services / There are some changes in the running context . It is essentially based on OS Software running on , But our ability to arrange and deploy hardware is constantly changing .

The physical machine / virtual machine :

For the software running environment , They are all oriented to the whole quantity OS Running . There is no difference , Only in modern times, the performance of a single hardware resource has been continuously improved , In order to make rational use of the hardware resources of a single machine , The virtual machine simulates the virtualization of hardware , Make a physical machine virtual out of multiple machines that can provide services independently , For users , There is no difference between virtual machine and physical machine . But after the virtual machine completes the environment , Machine backup and replication can be carried out quickly , The operation and maintenance mode has been changed . The essence is to run for a single machine .

Containerized operation ：

The current running container mode is just linux Process isolation feature of system namespace , send linux The system passes through a layer linux Naming Manager , Finally, the isolation effect of class virtual machine is realized . The running container is essentially linux A namespace based independent process of , This process uses the kernel support of the operating system , And build a separate running folder ： The running environment based on the image file -- Containers .

The concept of image is inherited to the virtual machine , Manage in a hierarchical manner , When executing a specific container, all files will be merged according to the level of the image . So when building an image , There is one from the image as the basic image ----- The most basic image is a linux Basic file package .

Cloud deployment ：

When the lightweight isolation and container management based on namespace are realized API After encapsulation , The centralized management platform based on container orchestration appears , Let the containerized hardware resources carry out dynamic container construction . Finally, a container choreography service based on resource declaration is formed , That is, the cloud deployment scheme is perfect .

At this stage, the container management platform becomes the basis for managing a single hardware resource . The container arrangement and management management platform realizes the management and monitoring of container operation and state detection , And provides container networking services , Finally, to achieve load balancing service Unified and open virtual path .

therefore , When we say container oriented programming , Provide services for cloud , Finally, we should start with a single application , Adopt decentralized thinking to build services , Finally adapt to the basic application platform based on cloud deployment .