Microservice registry Nacos introduction

One 、 background

         Recently, the company has used nacos As a registry , I just got to know ,Nacos  The main role is to discover 、 Configure and manage microservices .Nacos Provides an easy-to-use feature set , Helps you quickly implement dynamic service discovery 、 Service configuration 、 Service metadata and traffic management .

Two 、 vision

        Nacos By providing easy-to-use dynamic service discovery 、 Service configuration 、 Service infrastructure such as service sharing and management , Help users in the cloud native era , In the private cloud 、 In all cloud environments like hybrid cloud or public cloud , Better build 、 deliver 、 Manage your own micro service platform , Faster reuse and composition of business services , Deliver the value of business innovation faster , So as to win the market for users .

3、 ... and 、 Key features

1、 Service discovery and service health monitoring

        Nacos Provide real-time health checks on services , Prevent sending requests to unhealthy hosts or service instances .

2、 Dynamic configuration services

         Dynamic configuration services allow you to centralize 、 Manage application configuration and service configuration of all environments in an external and dynamic way .

         Dynamic configuration eliminates the need to redeploy applications and services when configuration changes , Make configuration management more efficient and agile .

         Configuration centralized management makes it easier to implement stateless Services , Make it easier for services to scale elastically on demand .

3、 dynamic DNS service

         Support weight routing , It is easier to realize middle tier load balancing 、 More flexible routing strategy 、 Flow control and the simplicity of the data center intranet DNS Resolution service .

4、 Services and metadata management

        Nacos It enables you to manage all services and metadata of data center from the perspective of microservice platform construction , Include a description of the management service 、 Life cycle 、 Static dependency analysis of services 、 The health of the service 、 Traffic management of services 、 Routing and security policies .

Four 、 advantage

         Use Nacos Simplify service discovery 、 Configuration Management 、 Solutions for service governance and management , Let the discovery of microservices 、 management 、 share 、 It's easier to combine . When the consumer from nacos After the registration center obtains the service provided by the manufacturer once , Next time you don't need nacos You can also get this service from the manufacturer .

5、 ... and 、 Main concepts

1、Namespace

         Used for tenant granularity configuration isolation . Under different namespaces , There can be the same Group or Data ID Configuration of .Namespace One of the most common scenarios is the separation of configurations between different environments , For example, develop the resources of test environment and production environment （ Such as configuration 、 service ） Isolation etc. , Do not specify command space , It uses public.

2、Group

        Nacos A set of configuration sets in , It is one of the dimensions of organization configuration . Through a meaningful string （ Such as Buy or Trade ） Group configuration sets , To distinguish Data ID Same configuration set . When you are in Nacos When you create a configuration on , If the name of the configuration group is not filled in , Then the name of the configuration group is used by default DEFAULT_GROUP .

3、Data ID

        Nacos Of a configuration set in ID. config set ID It is one of the dimensions of organization division and configuration .Data ID Usually used to organize the configuration set of partition system . A system or application can contain multiple configuration sets , Each configuration set can be identified by a meaningful name . Generally, the name of micro service is used as Date ID.

4、Service Metadata

         Service metadata refers to including service endpoints (endpoints)、 Service Tag 、 Service version number 、 Service instance weight 、 Routing rules 、 Security policy and other data describing the service .

5、Service Provider

Refers to the application side that provides reusable and callable services .

6、Service Consumer

It refers to the application party that will initiate a service call .

6、 ... and 、 Data model

        Nacos Data model Key Uniquely determined by triples , Namespace The default is empty string , Public namespace （public）, The default grouping is DEFAULT_GROUP. Every development or self-test will cut branches , stay nacos Create a new namespace on , Set group name .

7、 ... and 、 Covering relationships

        Nacos The configuration on is the second priority of external file configuration , The following figure shows the priority of configuring the override relationship , Lower the priority from top to bottom ：

8、 ... and 、Nacos Console operation

         The main purpose is to enhance the list of services , Health management , Service governance , Management and control capabilities in distributed configuration management , In order to further help users reduce the cost of managing microservice application architecture .

1、 List of services

         Service list helps users manage all their micro services and service health status with a unified view .

         Click Details... On the service list page , You can see the details of the service . You can view the service 、 Basic information about clusters and instances . You can click the Edit button of the instance .

（1） Modify the weight of the instance . If you want to increase the instance traffic , You can increase the weight , If you don't want the instance to receive traffic , You can set the weight to 0.

（2） You can modify the configuration metadata information of the instance .

（3） Local self-test of each service , Sometimes it will be forwarded to the online deployment environment , unable debug, At this time, you need to offline online services on the service details page , Launch local services .

2、 Configuration Management

        Nacos Support based on Namespace and Group Configuration group management , So that users can more flexibly according to their own needs according to the environment or application 、 Module etc. , Group management microservices and Spring A large number of configurations . One configuration per microservice , The format is Properties.

3、 Namespace Management

        Nacos be based on Namespace Help users logically isolate multiple namespaces , This can help users better manage tests 、 Advance 、 Production and other multi environment services and configurations , Let each environment have the same configuration （ Such as database data source ） You can define different values .

Nine 、 Online deployment

1、 land nacos Download installation package

https://github.com/alibaba/nacos/releases

 2、 adopt scp The command is uploaded to the server

3、 decompression tar Package and go to the decompression directory to execute the startup command .

tar -xvf nacos-server-$version.tar.gz
cd nacos/bin
sh startup.sh -m standalone

4、 If there is a firewall, turn off the firewall , At the same time, configure security group opening 8848 port .

5、 Login server address :ip:8848, The user name and password are nacos.

Ten 、 Reference resources

https://nacos.io/en-us/docs/quick-start.html

home

11、 ... and 、 summary

         That's about nacos Some introductions of , Record it here , I hope I can help you , If you think it's good , Welcome to wechat search java Basic notes , Relevant knowledge will be continuously updated later , Make progress together .