Nacos in spring cloud Alibaba

itread01 2020-11-06 20:10:16
nacos spring cloud alibaba

### Nacos Technical explanation ** When it comes to decentralized systems, I don't want to mention CAP Principles ** #### What is CAP **CAP Principles are also called CAP Theorem , In a decentralized system , Uniformity (Consistency)、 Usability (Availability)、 Fault tolerance of dividing slot (Partition tolerance).CAP Principle means , These three elements can only achieve two points at most at the same time , It's impossible to combine the three .** **CAP Under the principle of Alibaba Naos Simultaneous support AP and CP Pattern , He chooses temporary and permanent based on service registration AP The pattern is still CP Pattern , He's here to support CP The pattern is to my understanding , It should be to configure the central cluster , Because nacos It can be both a registry and a configuration center , Because his configuration center information is stored in nacos Inside , If because of nacos When one of them went down , There is no synchronization configuration information yet , Configuration inconsistency may occur ., The configuration change of the configuration center is that the server has a listener , Configuration changes in the configuration center , Then the server will listen to the configuration change , To make a change ** ** Now I build a simple micro service system , Explain the system ** **( Personal servers , Limited flow , Please cherish )[ Click on the project experience address ](** ** System architecture diagram :** ![]( ** This mainly completes a front-end page for real-time calculation function , You can understand it as a simple calculator .** * website : front end * Gateway : Service gateway * UserCenter : User services * MqCenter: Information services * AlogirthmCenter: Computing services * ConfigCenter: Configuration center * ServiceDiscovery(Nacos): Service discovery * CPP For C The calculation flow written in language ** The technology stack used in this project includes ,Spring Cloud Alibaba/Spring Boot/Mysql/MQ/Linux etc. ** #### What is Nacos **[ official document ](** **Nacos Provide 「 Registration Center 」、「 Configuration center 」 and 「 Dynamic DNS Service 」 Three functions .** ** It's on it Nacos You can learn about it by yourself , Yes Nacos Do a deep understanding of , The so-called master leads the door , Practice is personal , We need to learn more , Learn more about ** ** It's getting late , There were a lot of people , Talk less , Get down to business first .** ** [Nacos Download address ](** ** Select the corresponding version to decompress ( Be careful Nacos After decompression It's a complete execution package , If you don't use it skillfully , Don't touch the configuration information in it )** ![]( ** After downloading, unzip and enter bin Catalog Execute the command at the terminal ** * MAC `sh -m standalone` (standalone Stands for stand-alone mode execution , Later, we will explain how to build and start cluster mode ) * Windows `cmd startup.cmd` ** After starting successfully Default account password nacos/nacos( Initial account password )** ![]( ** After logging in, you can see the Chinese and English switch in the upper right corner , Students who are not good at English You can switch to Chinese ** ![]( * Configuration management is mainly used for project configuration , For example, configuration files can be used nacos To manage Because nacos It's not just a service center , It's also a configuration center ( I'll talk about it later ) Our development project configuration generally has the following methods : 1. Hard code -- As a form of class field , Lead to : Dynamic modification is difficult , No persistence 2. Configuration file ( properties、yml Files, etc )-- Lead to : Configuration changes dynamically , You may need to restart the application , Make the configuration work . Of course , You can also add a timed task to your code , Every time 10s Read configuration file contents , Let the latest configuration take effect in the application in time , That way, you won't have to To restart the application “ Heavy ” Operation and maintenance operation of . 3. DB Configuration table -- Lead to : Configuration changes dynamically , It may need to be solved through the exposure management interface . **Nacos Really separate the configuration from the application , Unified management , Elegant solution to dynamic configuration changes 、 Persistence 、 Operation and maintenance costs and other issues . The application itself does not need to add a new management configuration interface , You don't need to implement the persistence of the configuration by yourself , There is no need to introduce “ Scheduled tasks ” In order to reduce operation and maintenance costs .Nacos Provides configuration management functions , Collapse all the logic related to the configuration , And it's easy to use SDK, So that the configuration of the application can be very convenient Nacos It's more than that in management ,Nacos Provide DNS-F function , Can be associated with K8S、Spring Cloud and Dubbo And other open source products to integrate , Realize the registration function of the service .** * Service discovery is used to manage registration to nacos Microservices on , Can achieve services offline and other functions . * The name space is used to distinguish the service environment , When a project needs to be developed , Test , Production and many different configurations , The name space can be used for configuration isolation . * Cluster management I'll talk about it later ** The next chapter will explain how to use Nacos Register a simple micro

  1. 【计算机网络 12(1),尚学堂马士兵Java视频教程
  2. 【程序猿历程,史上最全的Java面试题集锦在这里
  3. 【程序猿历程(1),Javaweb视频教程百度云
  4. Notes on MySQL 45 lectures (1-7)
  5. [computer network 12 (1), Shang Xuetang Ma soldier java video tutorial
  6. The most complete collection of Java interview questions in history is here
  7. [process of program ape (1), JavaWeb video tutorial, baidu cloud
  8. Notes on MySQL 45 lectures (1-7)
  9. 精进 Spring Boot 03:Spring Boot 的配置文件和配置管理,以及用三种方式读取配置文件
  10. Refined spring boot 03: spring boot configuration files and configuration management, and reading configuration files in three ways
  11. 精进 Spring Boot 03:Spring Boot 的配置文件和配置管理,以及用三种方式读取配置文件
  12. Refined spring boot 03: spring boot configuration files and configuration management, and reading configuration files in three ways
  13. 【递归,Java传智播客笔记
  14. [recursion, Java intelligence podcast notes
  15. [adhere to painting for 386 days] the beginning of spring of 24 solar terms
  16. K8S系列第八篇(Service、EndPoints以及高可用kubeadm部署)
  17. K8s Series Part 8 (service, endpoints and high availability kubeadm deployment)
  18. 【重识 HTML (3),350道Java面试真题分享
  19. 【重识 HTML (2),Java并发编程必会的多线程你竟然还不会
  20. 【重识 HTML (1),二本Java小菜鸟4面字节跳动被秒成渣渣
  21. [re recognize HTML (3) and share 350 real Java interview questions
  22. [re recognize HTML (2). Multithreading is a must for Java Concurrent Programming. How dare you not
  23. [re recognize HTML (1), two Java rookies' 4-sided bytes beat and become slag in seconds
  24. 造轮子系列之RPC 1:如何从零开始开发RPC框架
  25. RPC 1: how to develop RPC framework from scratch
  26. 造轮子系列之RPC 1:如何从零开始开发RPC框架
  27. RPC 1: how to develop RPC framework from scratch
  28. 一次性捋清楚吧,对乱糟糟的,Spring事务扩展机制
  29. 一文彻底弄懂如何选择抽象类还是接口,连续四年百度Java岗必问面试题
  30. Redis常用命令
  31. 一双拖鞋引发的血案,狂神说Java系列笔记
  32. 一、mysql基础安装
  33. 一位程序员的独白:尽管我一生坎坷,Java框架面试基础
  34. Clear it all at once. For the messy, spring transaction extension mechanism
  35. A thorough understanding of how to choose abstract classes or interfaces, baidu Java post must ask interview questions for four consecutive years
  36. Redis common commands
  37. A pair of slippers triggered the murder, crazy God said java series notes
  38. 1、 MySQL basic installation
  39. Monologue of a programmer: despite my ups and downs in my life, Java framework is the foundation of interview
  40. 【大厂面试】三面三问Spring循环依赖,请一定要把这篇看完(建议收藏)
  41. 一线互联网企业中,springboot入门项目
  42. 一篇文带你入门SSM框架Spring开发,帮你快速拿Offer
  43. 【面试资料】Java全集、微服务、大数据、数据结构与算法、机器学习知识最全总结,283页pdf
  44. 【leetcode刷题】24.数组中重复的数字——Java版
  45. 【leetcode刷题】23.对称二叉树——Java版
  46. 【leetcode刷题】22.二叉树的中序遍历——Java版
  47. 【leetcode刷题】21.三数之和——Java版
  48. 【leetcode刷题】20.最长回文子串——Java版
  49. 【leetcode刷题】19.回文链表——Java版
  50. 【leetcode刷题】18.反转链表——Java版
  51. 【leetcode刷题】17.相交链表——Java&python版
  52. 【leetcode刷题】16.环形链表——Java版
  53. 【leetcode刷题】15.汉明距离——Java版
  54. 【leetcode刷题】14.找到所有数组中消失的数字——Java版
  55. 【leetcode刷题】13.比特位计数——Java版
  56. oracle控制用户权限命令
  57. 三年Java开发,继阿里,鲁班二期Java架构师
  58. Oracle必须要启动的服务
  59. 万字长文!深入剖析HashMap,Java基础笔试题大全带答案
  60. 一问Kafka就心慌?我却凭着这份,图灵学院vip课程百度云