Service Registration: Spring Cloud Eureka (Chapter 3)

Others 2019-06-16 14:22:58 views: null
Copyright: without the author's permission is not allowed for any commercial purposes https://blog.csdn.net/weixin_38231448/article/details/91039962

作者：jiangzz 电话：15652034180 微信：jiangzz_wx 微信公众账号：jiangzz_wy

Spring Cloud Eureka is part of the Spring Cloud Netflix Micro suite of services, which is based Netflix Eureka made a second package, is responsible for completion of the service management function micro-service architecture. Spring Cloud increased by as Eureka Spring Boot-style automated provisioning, we only need to rely on a simple introduction and annotation configuration can make micro-service applications Spring Boot built to easily integrate with Eureka service governance system.
Here Insert Picture Description

Eureka single

  • Introduce the following dependence
<dependency>
  <groupId>org.springframework.cloud</groupId>
  <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>
  • application.properties
server.port=8761

eureka.instance.hostname=localhost
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false

You must configure the eureka.instance.hostnameotherwise self-registration will try to Eureka

  • EurekaSpringBootApplication
@SpringBootApplication
@EnableEurekaServer
public class EurekaSpringBootApplication {
    public static void main(String[] args) {
        SpringApplication.run(EurekaSpringBootApplication.class,args);
    }
}
  • Access Browser
    Here Insert Picture Description
  • Configuration instructions
Configuration Explanation default
eureka.server.enable-self-preservation Eureka self-protection mechanism true
eureka.server.eviction-interval-timer-in-ms Excluding a failed node interval Eureka 60 seconds
eureka.server.renewal-percent-threshold Calculating the threshold Eureka lease 0.85
eureka.client.register-with-eureka It is registered to Eureka true
eureka.client.fetch-registry Whether to update the list of information from Eureka true
eureka.instance.hostname Hostname micro service instance Eureka -

Registration Service

  • pom.xml
<dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-dependencies</artifactId>
      <version>Greenwich.SR1</version>
      <type>pom</type>
      <scope>import</scope>
    </dependency>
  </dependencies>
</dependencyManagement>

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
  <groupId>org.springframework.cloud</groupId>
  <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
  • application.properties

Add the following new configuration

spring.application.name=USER-SERVICE
eureka.instance.instance-id=001
eureka.instance.prefer-ip-address=true
eureka.instance.lease-expiration-duration-in-seconds=20
eureka.instance.lease-renewal-interval-in-seconds=10

eureka.client.register-with-eureka=true
eureka.client.healthcheck.enabled=true
eureka.client.fetch-registry=false
eureka.client.service-url.defaultZone=http://localhost:8761/eureka/

Run SpringBoot procedures, registration services

Open your browser to view the Eureka registry
Here Insert Picture Description

Reference service

Because the default in Eureka Ribbon integrated plug-in, the main need to import spring-cloud-starter-netflix-eureka-clientto.

  • pom.xml
<parent>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-parent</artifactId>
  <version>2.1.5.RELEASE</version>
</parent>

<dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-dependencies</artifactId>
      <version>Greenwich.SR1</version>
      <type>pom</type>
      <scope>import</scope>
    </dependency>
  </dependencies>
</dependencyManagement>

<dependencies>

  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
  </dependency>

  <dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
  </dependency>

  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <scope>test</scope>
  </dependency>

</dependencies>
  • application.properties
eureka.client.fetch-registry=true
eureka.client.register-with-eureka=false
eureka.client.service-url.defaultZone=http://localhost:8761/eureka/
  • EurekaSpringBootConsumer
@SpringBootApplication
public class EurekaSpringBootConsumer {
    public static void main(String[] args) {
        SpringApplication.run(EurekaSpringBootConsumer.class,args);
    }
    @Bean
    @LoadBalanced
    public RestTemplate restTemplate(){
       return new RestTemplate();
    }
}
  • Rest Template Tests
@SpringBootTest(classes = EurekaSpringBootConsumer.class)
@RunWith(SpringRunner.class)
public class RestTemplateTests {
    @Autowired
    private RestTemplate restTemplate;
    @Test
    public void testQueryUserById(){
        String url="http://USER-SERVICE/manager/user/8";
        User user = restTemplate.getForObject(url, User.class);
        System.out.println(user);
    }
}

Eureka Server Security

  • Original pom.xml increase
<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-security</artifactId>
</dependency>
  • application.properties
spring.security.user.name=jiangzz
spring.security.user.password=123456
  • WebSecurityConfig
@EnableWebSecurity
@Configuration
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

  @Override
  protected void configure(HttpSecurity http) throws Exception {
    http.csrf().disable(); // 关闭csrf,否则其他主机无法登陆认证
    http.authorizeRequests().anyRequest().authenticated().and().httpBasic();//设置成httpBasic，不可以设置为表单
  }

}

References node services

eureka.client.service-url.defaultZone=http://jiangzz:123456@localhost:8761/eureka/

High Availability Configuration

  • EurekaServiceApplication
package com.jiangzz;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@SpringBootApplication
@EnableEurekaServer
public class EurekaServiceApplication {
    public static void main(String[] args) {
        SpringApplication.run(EurekaServiceApplication.class,args);
    }
}
  • WebSecurityConfig
package com.jiangzz;


import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;

@EnableWebSecurity
@Configuration
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.csrf().disable(); // 关闭csrf,否则其他主机无法登陆认证
        http.authorizeRequests().anyRequest().authenticated().and().httpBasic();//设置成httpBasic，不可以设置为表单
    }
}
  • application-eureka-1.properties
server.port=1111

# 指定当前注册中心的服务名称
spring.application.name=eurekaregistry

## 启用注册中心主动失效，并且每次主动失效检测间隔为5s 默认值60s
eureka.server.eviction-interval-timer-in-ms= 5000
## 设置eureka注册中心的响应更新时间
eureka.server.responseCacheUpdateIntervalMs=3000
eureka.server.responseCacheAutoExpirationInSeconds=60

## 配置注册中心的主机名
eureka.instance.instance-id = eureka-1
eureka.instance.hostname = CentOSA
## 服务刷新时间配置，每隔这个时间会主动心跳一次
eureka.instance.lease-renewal-interval-in-seconds= 5
## 服务提供者被认定为丢失心跳超时，失效多久后被删除
eureka.instance.lease-expiration-duration-in-seconds=15

## 配置定时获取|抓取注册中心的数据时间
eureka.client.registry-fetch-interval-seconds= 5
eureka.client.instance-info-replication-interval-seconds= 5
## 配置集群中其他eureka实例，用于本eureka实例的注册方。
eureka.client.region=beijing
eureka.client.availability-zones.beijing=zone-2,zone-3
eureka.client.service-url.zone-2=http://${spring.security.user.name}:${spring.security.user.password}@CentOSB:1111/eureka/
eureka.client.service-url.zone-3=http://${spring.security.user.name}:${spring.security.user.password}@CentOSC:1111/eureka/

spring.security.user.name=jiangzz
spring.security.user.password=123456
  • application-eureka-2.properties
server.port=1111

# 指定当前注册中心的服务名称
spring.application.name=eurekaregistry

## 启用注册中心主动失效，并且每次主动失效检测间隔为5s 默认值60s
eureka.server.eviction-interval-timer-in-ms= 5000
## 设置eureka注册中心的响应更新时间
eureka.server.responseCacheUpdateIntervalMs=3000
eureka.server.responseCacheAutoExpirationInSeconds=60

## 配置注册中心的主机名
eureka.instance.instance-id = eureka-2
eureka.instance.hostname = CentOSB
## 服务刷新时间配置，每隔这个时间会主动心跳一次
eureka.instance.lease-renewal-interval-in-seconds= 5
## 服务提供者被认定为丢失心跳超时，失效多久后被删除
eureka.instance.lease-expiration-duration-in-seconds=15

## 配置定时获取|抓取注册中心的数据时间
eureka.client.registry-fetch-interval-seconds= 5
eureka.client.instance-info-replication-interval-seconds= 5
## 配置集群中其他eureka实例，用于本eureka实例的注册方。
eureka.client.region=beijing
eureka.client.availability-zones.beijing=zone-1,zone-3
eureka.client.service-url.zone-1=http://${spring.security.user.name}:${spring.security.user.password}@CentOSA:1111/eureka/
eureka.client.service-url.zone-3=http://${spring.security.user.name}:${spring.security.user.password}@CentOSC:1111/eureka/

spring.security.user.name=jiangzz
spring.security.user.password=123456
  • application-eureka-3.properties
server.port=1111

# 指定当前注册中心的服务名称
spring.application.name=eurekaregistry

## 启用注册中心主动失效，并且每次主动失效检测间隔为5s 默认值60s
eureka.server.eviction-interval-timer-in-ms= 5000
## 设置eureka注册中心的响应更新时间
eureka.server.responseCacheUpdateIntervalMs=3000
eureka.server.responseCacheAutoExpirationInSeconds=60

## 配置注册中心的主机名
eureka.instance.instance-id = eureka-3
eureka.instance.hostname = CentOSC
## 服务刷新时间配置，每隔这个时间会主动心跳一次
eureka.instance.lease-renewal-interval-in-seconds= 5
## 服务提供者被认定为丢失心跳超时，失效多久后被删除
eureka.instance.lease-expiration-duration-in-seconds=15

## 配置定时获取|抓取注册中心的数据时间
eureka.client.registry-fetch-interval-seconds= 5
eureka.client.instance-info-replication-interval-seconds= 5
## 配置集群中其他eureka实例，用于本eureka实例的注册方。
eureka.client.region=beijing
eureka.client.availability-zones.beijing=zone-1,zone-2
eureka.client.service-url.zone-1=http://${spring.security.user.name}:${spring.security.user.password}@CentOSA:1111/eureka/
eureka.client.service-url.zone-2=http://${spring.security.user.name}:${spring.security.user.password}@CentOSB:1111/eureka/

spring.security.user.name=jiangzz
spring.security.user.password=123456
  • Maven package instruction packing
mvn package
  • Upload eurekacloud-1.0-SNAPSHOT.jar to CentOSA, CentOSB, CentOSC
[root@CentOSA ~]# java -jar eurekacloud-1.0-SNAPSHOT.jar --spring.profiles.active=eureka-1
[root@CentOSB ~]# java -jar eurekacloud-1.0-SNAPSHOT.jar --spring.profiles.active=eureka-2
[root@CentOSC ~]# java -jar eurekacloud-1.0-SNAPSHOT.jar --spring.profiles.active=eureka-3

CentOSA、CentOSB、CentOSCYou must configure the mapping between host names and IP, and turn off the firewall

[root@CentOSX ~]# cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.239.128 CentOSA
192.168.239.129 CentOSB
192.168.239.130 CentOSC
  • Accesses browser to view Eureka successful start
    Here Insert Picture Description

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