SpringCloud Learning Series -Ribbon load balancing (3)

1. Architecture Description

 

 

Ribbon is divided into two steps during operation
first step is to select EurekaServer, it is preferable to select a less loaded server within the same region.
The second step then according to a user-specified policy, select from a registration server to get the list of services address.
Wherein Ribbon provides a variety of strategies: such as polling, random and weighted according to the response time.

2. Reference microservicecloud-provider-dept-8001, two new, named 8002,8003

3. New 8002/8003 database, each micro-services are connected respective databases

8002SQL script

 
DROP DATABASE IF EXISTS cloudDB02;
 
CREATE DATABASE cloudDB02 CHARACTER SET UTF8;
 
USE cloudDB02;
 
CREATE TABLE dept
(
  deptno BIGINT NOT NULL PRIMARY KEY AUTO_INCREMENT,
  dname VARCHAR(60),
  db_source   VARCHAR(60)
);
 
INSERT INTO dept(dname,db_source) VALUES('开发部',DATABASE());
INSERT INTO dept(dname,db_source) VALUES('人事部',DATABASE());
INSERT INTO dept(dname,db_source) VALUES('财务部',DATABASE());
INSERT INTO dept(dname,db_source) VALUES('市场部',DATABASE());
INSERT INTO dept(dname,db_source) VALUES('运维部',DATABASE());
 
SELECT * FROM dept;
 

DROP DATABASE IF EXISTS cloudDB03;
 
CREATE DATABASE cloudDB03 CHARACTER SET UTF8;
 
USE cloudDB03;
 
 
CREATE TABLE dept
(
  deptno BIGINT NOT NULL PRIMARY KEY AUTO_INCREMENT,
  dname VARCHAR(60),
  db_source   VARCHAR(60)
);
 
INSERT INTO dept(dname,db_source) VALUES('开发部',DATABASE());
INSERT INTO dept(dname,db_source) VALUES('人事部',DATABASE());
INSERT INTO dept(dname,db_source) VALUES('财务部',DATABASE());
INSERT INTO dept(dname,db_source) VALUES('市场部',DATABASE());
INSERT INTO dept(dname,db_source) VALUES('运维部',DATABASE());
 
SELECT * FROM dept;

 8003SQL script

4. Modify the respective YML 8002/8003

 8002YML

server:
  port: 8002
  
mybatis:
  config-location: classpath:mybatis/mybatis.cfg.xml  #mybatis所在路径
  type-aliases-package: com.atguigu.springcloud.entities #entity别名类
  mapper-locations:
  - classpath:mybatis/mapper/**/*.xml #mapper映射文件
    
spring:
   application:
    name: microservicecloud-dept 
   datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: org.gjt.mm.mysql.Driver
    url: jdbc:mysql://localhost:3306/cloudDB02
    username: root
    password: 123456
    dbcp2:
      min-idle: 5
      initial-size: 5
      max-total: 5
      max-wait-millis: 200
      
eureka: 
  Client: Client # eureka registered into the list of services in the 
    Service-url: 
      defaultzone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/,http://eureka7003 .com: 7003 / Eureka / 
  instance: 
    instance-the above mentioned id: microservicecloud-dept8002 # custom service name information 
    prefer-ip-address: true # access path to display the IP address 
      
info: 
  the app.name: atguigu-microservicecloud 
  company.name: the WWW .atguigu.com 
  build.artifactId: $ project.artifactId $ 
  build.version: $ project.version $
      
      
      
 
 

8003YML

server:
  port: 8003
  
mybatis:
  config-location: classpath:mybatis/mybatis.cfg.xml  #mybatis所在路径
  type-aliases-package: com.atguigu.springcloud.entities #entity别名类
  mapper-locations:
  - classpath:mybatis/mapper/**/*.xml #mapper映射文件
    
spring:
   application:
    name: microservicecloud-dept 
   datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: org.gjt.mm.mysql.Driver
    url: jdbc:mysql://localhost:3306/cloudDB03
    username: root
    password: 123456
    dbcp2:
      min-idle: 5
      initial-size: 5
      max-total: 5
      max-wait-millis: 200
      
eureka: 
  Client: Client # eureka registered into the list of services in the 
    Service-url: 
      defaultzone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/,http://eureka7003 .com: 7003 / Eureka / 
  instance: 
    instance-the above mentioned id: microservicecloud-dept8003 # custom service name information 
    prefer-ip-address: true # access path to display the IP address 
      
info: 
  the app.name: atguigu-microservicecloud 
  company.name: the WWW .atguigu.com 
  build.artifactId: $ project.artifactId $ 
  build.version: $ project.version $
      
      
      

Remarks:

port

Database Links

External exposure unified service instance name

 

 5. Start cluster configuration region 3 eureka

 6. Start 3 Dept micro service starts and each test passed

 7. Start microservicecloud-consumer-dept-80

8. The client load balancing is completed by Ribbo and access services on micro-step Dept

  http://localhost/consumer/dept/list

 Observe the database name to see the return of, different, load balancing implementation

9. summary

  

Ribbon is actually a soft load balancing of client components,
he can request and other required client used in combination, and eureka combination is just an example of them.