Introduction to cloud native + container concept

 “ This article introduces the basic concept of cloud primitiveness and the container , Suitable for beginners who first contact the cloud field .”

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  Basic concepts

• Cloud native (Cloud+Native) It is a distributed cloud based on distributed deployment and unified transportation management , In containers 、 Microservices 、DevOps And other technologies .—— On the cloud , Use the ECS instead of the local server .
• Program in cloud , Not traditional data centers .

• Writing locally deployed applications that run on corporate servers is often written in traditional languages , Such as C/C ++,C＃ Or others Visual Studio Language （ If deployed in Windows Server On the platform ） And enterprise class Java. If it's on a mainframe , May use Cobol.

• Cloud native applications are more likely to be written in Web centric languages , That means using HTML,CSS,Java,JavaScript,.Net,Go,Node.js,PHP,Python and Ruby.

• Cloud native applications are always up to date , Cloud native applications are always available . Locally deployed applications need to be updated , And it is usually provided by the supplier on a subscription basis , And you need to shut down when installing updates .

• Cloud native applications take advantage of cloud resiliency by adding resources during peak periods . If your cloud based e-commerce application is used frequently , You can set it up to use additional computing resources , Until the peak subsides, then turn off these resources . Cloud native applications can be adjusted to increase resources and scale as needed .

• Cloud native applications work in virtualized environments , There is no problem sharing resources with other applications . Many locally deployed applications either do not work properly in a virtual environment , Or it doesn't work at all , Must be non virtualized .

• Locally deployed applications tend to be single in design . They will certainly unload some work into the library , But in the end it's a big application with lots of subroutines . Cloud native applications are more modular , Many functions are decomposed into microservices . This allows them to be turned off when they are not needed , And extend the update to that module , Not the entire application .

Microservices

• Microservice is an architecture scheme for building applications , Different from the traditional single application, the microservice architecture divides the application into multiple core functions , Each function is called a separate service , Can be built and deployed separately , The failure of one service will not affect other functional modules , This sentence reflects its release for a specific service , Little impact , Low risk and other characteristics .

Service Grid (Service Mesh)

• Service grid refers to the configurable infrastructure layer for microservice applications . When using the service grid, you usually provide a sidecar Proxy instance , Main treatment service Communication between 、 monitor 、 And some safety related considerations , Every serivce There will be one inside sidecar, It also provides service discovery 、 Load balancing 、 Authorization and other functions .

Containers

Containers

• It can be understood simply as a subsystem independent of the host under the host system .

Container concept

• A container is a series of processes separated from the rest of the system , All the files needed to run these processes are provided by a single image .

Container meaning

• Containers are used to store applications and application related dependencies “ Independent containers ”, According to the different characteristics of the goods transported, a variety of container types can be formulated ( I.e. container image ).
• The container image encapsulates the environment on which the container runs , To avoid relying on the operating system of the server running the container .
• Containers are portable and consistent .
• Containerization provides implementation guarantee for microservices , Play the role of application isolation .

Docker Containers

• Docker Items are mirrored through containers , The complete environment needed to run an application directly —— Package the file system of the entire operating system .
• Docker advantage ： The project greatly reduces the use threshold of container technology . Lightweight , portable , virtualization , Write a program and throw it into an image, which can be deployed and run anywhere , Development 、 Testing and production environments are completely unified , It can also control and virtualize resources .
• Docker As an open source application container engine , It is designed for developers and system administrators to build 、 A platform for publishing and running distributed applications , Typical Docker platform Kubernetes、Openshift V3、Flynn、Deis etc.
• Docker Allows developers to package various applications and dependency packages into a portable package Docker In the container , With Docker Container is the basic unit of resource partition and scheduling , Encapsulating the environment of the entire software runtime , And then publish it to Linux On the machine .

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Reference material  

https://www.cnblogs.com/DTinsight/p/14522296.html

https://zhuanlan.zhihu.com/p/150190166

https://cloud.tencent.com/developer/article/1598764

https://baijiahao.baidu.com/s?id=1606406149473084309

https://zhuanlan.zhihu.com/p/441747471

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