Spring Cloud Eureka Cluster high-availability configuration

On the basis of the previous article, realize the Eureka simple cluster configuration to achieve high availability requirements. Eureka the cluster logic, and zookeeper the difference, do not do too much introduction

First, modify the "Ershuai-eureka-server" of the Application.yml

Spring:
  application:
    name:ershuai-eureka-server
  Profiles:
    active:1001 # This specifies the application-1001/to start 1002/1003.yml

second, the new "Application-1001/1002/1003.yml"

Register-with-eureka, fetch-registry default is True

Server:
  port:1001
  
Eureka:
  client:
    service-url:
      Defaultzone:http://localhost:1002/eureka, Http://localhost:1003/eureka
    #register-with-eureka:false # Whether to register itself to the Eureka server
    #fetch-registry:false # Whether to get registration information from Eureka
  instance:
    hostname:localhost
    Instance-id: ${spring.cloud.client.ipaddress}:${ Server.port} # Specifies that IP prefer-ip-address:true # for this instance is
    registered using IP instead of hostname
  #server:
    #enable-self-preservation: False # Turn on the protection mechanism

Server:
  port:1002
  
Eureka:
  client:
    service-url:
      Defaultzone:http://localhost:1001/eureka, Http://localhost:1003/eureka
    #register-with-eureka:false # Whether to register itself to the Eureka server
    #fetch-registry:false # Whether to get registration information from Eureka
  instance:
    hostname:localhost
    Instance-id: ${spring.cloud.client.ipaddress}:${ Server.port} # Specifies that IP prefer-ip-address:true # for this instance is
    registered using IP instead of hostname
  #server:
    #enable-self-preservation: False # Turn on the protection mechanism

Server:
  port:1003
  
Eureka:
  client:
    service-url:
      defaultzone:http://localhost:1001/ Eureka,http://localhost:1002/eureka
    #register-with-eureka:false # Whether to register itself to the Eureka server
    #fetch-registry: False # whether to get registration information from Eureka
  instance:
    hostname:localhost
    Instance-id: ${spring.cloud.client.ipaddress }:${server.port} # Specifies that IP prefer-ip-address:true # for this instance is
    registered using IP instead of hostname
  #server:
    # Enable-self-preservation:false # Open protection mechanism

Third, start the 1001/1002/1003 port service separately

Project right-click or Main method right---run as--configurations-Arguments

Set Name (custom)

Set Program arguments parameter:--spring.profiles.active=1001

Click "Run" to start

This 1001/1002/1003 is started separately, need run as three times, each start a port service

Access http://localhost:1001/1002/1003 Ports separately

You can see that the three-port services are registered with each other.

Iv. Registration of services

Create a "ershuai-eureka-client" sub-project

Pom.xml file

<dependencies>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-eureka</artifactId>
		</dependency>
		<dependency >
			<groupId>org.springframework.boot</groupId>
			<artifactId> spring-boot-starter-actuator</artifactid>
		</dependency>
	</dependencies>
	
	< build>
		<plugins>
			<plugin>
				<groupid>org.springframework.boot</groupid >
				<artifactId>spring-boot-maven-plugin</artifactId>
				<version>${ spring-boot.version}</version>
				<executions>
					<execution>
						<goals>
							<goal>repackage</goal>
						</goals>
					</execution>
				</executions>
			</plugin>
		</plugins>
	</build>

APPLICATION.YML file

Spring:
  application:
    name:ershuai-eureka-client

server:
  port:9001

Eureka:
  client:
    Service-url:
      defaultzone:http://localhost:1001/eureka,http://localhost:1002/eureka,http://localhost:1003/ Eureka # Multiple separated by ', '. You can also just fill in a
    #register-with-eureka:false # Whether to register itself to Eureka server
    #fetch-registry:false # Whether to get registration information
  from Eureka Instance:
    Instance-id: ${spring.cloud.client.ipaddress}:${server.port} # Specifies the IP prefer-ip-address for this instance
    : True # use IP instead of host name when registering

Test controller

@RestController public
class TestController {

	@Autowired
	discoveryclient discoveryclient;

	@GetMapping ("/test") public
	String test () {
		String services = "Services:" + this.discoveryClient.getServices ();
		SYSTEM.OUT.PRINTLN (services);
		return services;
	}
}

Main start

@EnableDiscoveryClient
@SpringBootApplication Public
class Eurekaclientapplication {public

	static void Main (string[] args) {
		springapplication.run (eurekaclientapplication.class, args);
	}
}

Visit http://localhost:1001/1002/1003 again and you can see that 9001 is registered to Eureka

Visit http://localhost:9001/test

You can see that the service is OK

Try to shut down 1001/1002/1003, any one or two services, Access Http://localhost:9001/test, still can run normally