親プロジェクトの設定
まず、Mavenマルチモジュールプロジェクトの親POMを作成します。pom.xmlは以下のように構成します:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<packaging>pom</packaging>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.12.RELEASE</version>
<relativePath/>
</parent>
<groupId>jp.techdev.microservices</groupId>
<artifactId>eureka-parent-project</artifactId>
<version>1.0.0</version>
<name>eureka-parent</name>
<description>Spring Cloud Netflix Eureka親プロジェクト</description>
<properties>
<java.version>11</java.version>
<spring-cloud.version>Hoxton.SR12</spring-cloud.version>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
依存関係の解決後、親プロジェクトのsrcディレクトリは削除可能です。
単一Eurekaサーバーの構築
新規Mavenモジュールeureka-registry-primaryを作成し、以下の依存関係を追加します:
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>
application.ymlにレジストリ設定を記述します:
server:
port: 8761
spring:
application:
name: eureka-registry
eureka:
instance:
hostname: primary-registry
client:
register-with-eureka: false
fetch-registry: false
service-url:
defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
server:
enable-self-preservation: false
起動クラスを作成します:
package jp.techdev.eureka.server;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
@SpringBootApplication
@EnableEurekaServer
public class PrimaryRegistryApplication {
public static void main(String[] args) {
SpringApplication.run(PrimaryRegistryApplication.class, args);
}
}
アプリケーション起動後、http://primary-registry:8761にアクセスするとEurekaダッシュボードが表示されます。
Eurekaクライアントの実装
モジュールeureka-service-sampleを作成し、以下の依存関係を追加します:
<dependencies>
<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-web</artifactId>
</dependency>
</dependencies>
クライアント設定ファイル:
server:
port: 8081
spring:
application:
name: sample-service
eureka:
client:
register-with-eureka: true
fetch-registry: true
service-url:
defaultZone: http://primary-registry:8761/eureka/
起動クラス:
package jp.techdev.eureka.client;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
@SpringBootApplication
@EnableDiscoveryClient
public class SampleServiceApplication {
public static void main(String[] args) {
SpringApplication.run(SampleServiceApplication.class, args);
}
}
Eurekaクラスターの構築
可用性向上のため、レジストリを複数台構成します。eureka-registry-primaryの設定を変更します:
server:
port: 8761
spring:
application:
name: eureka-registry
eureka:
instance:
hostname: registry-primary
client:
service-url:
defaultZone: http://registry-secondary:8762/eureka/
fetch-registry: true
register-with-eureka: true
2台目のモジュールeureka-registry-secondaryを作成します:
server:
port: 8762
eureka:
instance:
hostname: registry-secondary
client:
register-with-eureka: true
fetch-registry: true
service-url:
defaultZone: http://registry-primary:8761/eureka/
spring:
application:
name: eureka-registry
起動クラス:
package jp.techdev.eureka.server;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
@SpringBootApplication
@EnableEurekaServer
public class SecondaryRegistryApplication {
public static void main(String[] args) {
SpringApplication.run(SecondaryRegistryApplication.class, args);
}
}
hostsファイルに以下を追加します:
127.0.0.1 registry-primary
127.0.0.1 registry-secondary
クライアントは両方のレジストリに登録するように設定します:
eureka:
client:
service-url:
defaultZone: http://registry-primary:8761/eureka/,http://registry-secondary:8762/eureka/
認証付きEurekaサーバー
モジュールeureka-secure-registryを作成し、Spring Security依存関係を追加します:
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
</dependencies>
認証設定を含む設定ファイル:
server:
port: 8763
spring:
application:
name: eureka-secure-registry
security:
user:
name: admin
password: securepass
eureka:
instance:
hostname: secure-registry
client:
fetch-registry: false
register-with-eureka: false
CSRF保護を無効化するセキュリティ設定:
package jp.techdev.eureka.security.config;
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
public class EurekaSecurityConfig extends WebSecurityConfigurerAdapter {
@Override
protected void configure(HttpSecurity http) throws Exception {
http.csrf().ignoringAntMatchers("/eureka/**");
super.configure(http);
}
}
起動クラス:
package jp.techdev.eureka.security;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
@SpringBootApplication
@EnableEurekaServer
public class SecureRegistryApplication {
public static void main(String[] args) {
SpringApplication.run(SecureRegistryApplication.class, args);
}
}
認証付きレジストリへのクライアント登録
クライアントの設定ファイルに認証情報を含めます:
eureka:
client:
service-url:
defaultZone: http://admin:securepass@secure-registry:8763/eureka/
主要な設定パラメータ
eureka:
client:
register-with-eureka: true
fetch-registry: true
service-url:
defaultZone: http://localhost:8761/eureka/
enabled: true
registry-fetch-interval-seconds: 30
instance:
lease-renewal-interval-in-seconds: 30
lease-expiration-duration-in-seconds: 90
metadata-map:
zone: tokyo
hostname: localhost
prefer-ip-address: false
server:
enable-self-preservation: false