Spring Cloud負載均衡：使用zuul做服務器端負載均衡

時間 2019-11-17

標籤 spring cloud 負載均衡使用 zuul 服務器欄目 Spring 简体版

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1.目的：web

本文簡述Spring Cloud負載均衡之服務器負載均衡模式，使用組件爲zuul。spring

zuul做爲Spring Cloud中的網關組件，負責路由轉發、身份驗證、請求過濾等等功能，那麼咱們能夠利用其路由轉發功能，實現負載均衡中的服務器負載均衡這一模式。bash

2.所需組件：服務器

client組件（client1,client2,client4代碼相同，只是運行端口不一樣）：app

client1，端口8001，appname：AUTH-SERVICE負載均衡

client2，端口8002，appname：AUTH-SERVICEsocket

client4，端口8004，appname：AUTH-SERVICE1（用於驗證相同路由路徑，不一樣serviceId狀況） spring-boot

client組件均爲spring boot組件，註冊到eureka上，結果以下圖所示：url

zuul組件正確的配置文件以下：spa

 <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.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-zuul</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

3.詳細配置

zuul使用eureka負載均衡

server:
  port: 8003
eureka:
  instance:
    prefer-ip-address: true
    hostname: localhost
  client:
    service-url:
      defaultZone: http://admin:123456@localhost:8888/eureka/
spring:
  application:
    name: GATE-WAY
    path:
zuul:
  host:
    connect-timeout-millis: 5000
    socket-timeout-millis: 20000
  routes:
    AUTH-SERVICE:
      path: /index/**
      serviceId: AUTH-SERVICE
      stripPrefix: false
#AUTH-SERVICE:
#  ribbon:
#    listOfServers: http://localhost:8001,http://localhost:8002

啓動類的配置以下：

@EnableDiscoveryClient
@EnableZuulProxy
@SpringBootApplication
public class ZuullApplication {

    public static void main(String[] args) {
        SpringApplication.run(ZuullApplication.class, args);
    }

}

配置完成後，訪問http://localhost:8003/index/hello，便可見以下結果：

此時，若是將配置信息修改成：

server:
  port: 8003
eureka:
  instance:
    prefer-ip-address: true
    hostname: localhost
  client:
    service-url:
      defaultZone: http://admin:123456@localhost:8888/eureka/
spring:
  application:
    name: GATE-WAY
    path:
zuul:
  host:
    connect-timeout-millis: 5000
    socket-timeout-millis: 20000
  routes:
    AUTH-SERVICE11:
      path: /index/**
      serviceId: AUTH-SERVICE
      stripPrefix: false

即將routes的名稱修改一下，所得結果與上面一致，說明能夠任意命名路由名稱。

若是去掉：stripPrefix: false配置，則須要在路徑中添加對應的path前綴，便可實現與上面同樣的調用結果。

再將配置信息修改以下：

server:
  port: 8003
eureka:
  instance:
    prefer-ip-address: true
    hostname: localhost
  client:
    service-url:
      defaultZone: http://admin:123456@localhost:8888/eureka/
spring:
  application:
    name: GATE-WAY
    path:
zuul:
  host:
    connect-timeout-millis: 5000
    socket-timeout-millis: 20000
  routes:
    AUTH-SERVICE:
      path: /index/**
      serviceId: AUTH-SERVICE
      stripPrefix: false
    AUTH-SERVICE1:
      path: /index/**
      serviceId: AUTH-SERVICE1
      stripPrefix: false
#AUTH-SERVICE:
#  ribbon:
#    listOfServers: http://localhost:8001,http://localhost:8002
#ribbon:
#  eureka:
#    enabled: false

即再添加serviceId爲AUTH-SERVICE1路由規則，則結果以下：

說明在相同的路由規則下，若是同一個路徑有多個serviceId，則前面的serviceId配置會被覆蓋，最後一個serviceId起做用。

zuul獨立負載均衡

讓zuul本身管理負載均衡，則須要添加：ribbon.eureka.enabled: false配置，詳細配置代碼以下：

server:
  port: 8003
eureka:
  instance:
    prefer-ip-address: true
    hostname: localhost
  client:
    service-url:
      defaultZone: http://admin:123456@localhost:8888/eureka/
spring:
  application:
    name: GATE-WAY
    path:

zuul:
  host:
    connect-timeout-millis: 5000
    socket-timeout-millis: 20000
  routes:
    AUTH-SERVICE:
      path: /index/**
      serviceId: AUTH-SERVICE111
      stripPrefix: false
AUTH-SERVICE111:
  ribbon:
    listOfServers: http://localhost:8001,http://localhost:8002,http://localhost:8004
ribbon:
  eureka:
    enabled: false