Preface

nacos Configuration management model for .

Section 1 Configuration management model

nacos Configuration management model , about nacos Configuration Management , adopt Namespace,group,Data Id Be able to locate a configuration set .

config set Data ID

In the system , A configuration file is usually a configuration set , A configuration set can contain various configuration information of the system . for example , A configuration set may contain data sources , Thread pool , Log level and other configuration items . Each configuration set can define a meaningful name , It's the configuration set ID(Data ID)

Configuration item

Configuration items are the configuration contents contained in the configuration set . It represents a specific configurable parameter and its domain value , Usually, the key=value There is a form of . For example, the commonly configured log output level (logLevel=INFO|WARN|ERROR) It's a configuration item . The following supported configuration information formats

Configure grouping group

Configuration grouping is the grouping of configuration sets , Denote by a meaningful string , Different configuration groups can have the same configuration set . When 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. Common for configuring groups : Can be used to distinguish between different projects or applications .

Namespace Namespace

The namespace can be used for configuration isolation of different environments . For example, you can isolate the development environment , Test environment and production environment , Because their configurations are different , Or isolate different users , Different developers use the same nacos Manage your own configuration , It can be done by namespace Isolation . Under different namespaces , There can be configuration groups or configuration sets with the same name .

practice

Namespace: Representing different environments , for example Development , test , production .
Group: On behalf of a project , For example, take out items , Taxi project
DataId: There are often several projects under each project , Each configuration set generation is the main configuration file of a project .

In the second quarter Namespace Management

namespace Isolation design

namespace The design of nacos Based on this, multi environment and multi tenant ( Multiple users share nacos) data ( Configuration and services ) Segregated .

• From the perspective of a tenant , If there are many different environments , At this time, you can create different namespaces according to the specified environment , In order to achieve multi environment isolation . for example ： You may have development , Test and produce three different environments , Then use a set of nacos Clusters can be divided into three different namespace.
  

Namespace management and configuration data acquisition

How to create a namespace

1. Open the namespace on the left , Click new namespace
   
   
   At this point, you can switch the newly created namespace by entering the configuration list .
   

2. At this time in dev Create a new dataset
   

3. Write code
   Here we get dev Configuration under namespace , You need to pass namespace Of id( From the namespace, you can see namespace id),
   If you don't pass namespace, The default is public, That is, the system's own namespace .

package com.it2;
import com.alibaba.nacos.api.NacosFactory;
import com.alibaba.nacos.api.config.ConfigService;
import com.alibaba.nacos.api.exception.NacosException;
import java.util.Properties;
public class NacosDemo01 {
    

    public static void main(String[] args) throws NacosException {
    
        String dataId="nacos-demo.yaml";
        String group="DEFAULT_GROUP";

        String serverAddr="127.0.0.1:8848";

        Properties properties=new Properties();
        properties.put("serverAddr",serverAddr);
        // This is from wrong public Get configuration set from namespace of , You need a namespace id
        properties.put("namespace","d0f32411-9568-4cd3-a595-a1d98989bbeb");

        ConfigService configService=  NacosFactory.createConfigService(properties);
        String config=configService.getConfig(dataId,group,3000);
        System.out.println(config);
    }
}

4. Run code