第七篇 : 高可用的分佈式配置中心(Spring Cloud Config)
上一篇文章講述了一個服務如何從配置中心讀取文件,配置中心如何從遠程git讀取配置文件,當服務實例很多時,都從配置中心讀取文件,這時可以考慮將配置中心做成一個微服務,將其集羣化,從而達到高可用,架構圖如下:
一、創建項目
繼續使用上一篇文章的工程,備創代碼,複製成新的工程使用
1. 創建 eureka-server
創建eureka-server工程,用作服務註冊中心
1. pom.xml
在其pom.xml文件引入Eureka的起步依賴spring-cloud-starter-netflix- eureka-server,代碼如下:
<?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>
<groupId>com.gf</groupId>
<artifactId>eureka-server</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>eureka-server</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>com.gf</groupId>
<artifactId>chapter07</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<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-server</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-config-server</artifactId>
</dependency>
</dependencies>
</project>
2. applicaton.yml
在配置文件application.yml上,指定服務端口爲8889,加上作爲服務註冊中心的基本配置,代碼如下:
server:
port: 8889
eureka:
instance:
hostname: localhost
client:
register-with-eureka: false
fetch-registry: false
service-url:
defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
3. 主啓動類 EurekaServerApplication
package com.gf;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
@SpringBootApplication
@EnableEurekaServer
public class EurekaServerApplication {
public static void main(String[] args) {
SpringApplication.run(EurekaServerApplication.class, args);
}
}
2. 改造 config-server
1. pom.xml
在其pom.xml文件加上EurekaClient的起步依賴spring-cloud-starter-netflix-eureka-server,代碼如下:
<?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>
<groupId>com.gf</groupId>
<artifactId>config-server</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>config-server</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>com.gf</groupId>
<artifactId>chapter07</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-config-server</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>
</dependencies>
</project>
2. application.yml
配置文件application.yml,指定服務註冊地址爲http://localhost:8889/eureka/,其他配置同上一篇文章,完整的配置如下:
spring:
application:
name: config-server
cloud:
config:
server:
git:
uri: https://github.com/gf-huanchupk/SpringCloudLearning/
search-paths: respo
username:
password:
label: master
server:
port: 8888
eureka:
client:
service-url:
defaultZone: http://localhost:8889/eureka/
3. 主啓動類 ConfigServerApplication
最後需要在程序的啓動類Application加上@EnableEureka的註解。
package com.gf;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.config.server.EnableConfigServer;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
@SpringBootApplication
@EnableConfigServer
@EnableEurekaClient
public class ConfigServerApplication {
public static void main(String[] args) {
SpringApplication.run(ConfigServerApplication.class, args);
}
}
3. 改造 config-client
1. pom.xml
將其註冊微到服務註冊中心,作爲Eureka客戶端,需要pom文件加上起步依賴spring-cloud-starter-netflix-eureka-server,代碼如下:
<?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>
<groupId>com.gf</groupId>
<artifactId>config-client</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>config-client</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>com.gf</groupId>
<artifactId>chapter07</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>
</dependencies>
</project>
2. bootstrap.yml
配置文件bootstrap.yml,注意是bootstrap。加上服務註冊地址爲http://localhost:8889/eureka/
spring:
application:
name: config-client
cloud:
config:
label: master
profile: dev
#uri: http://localhost:8888/
discovery:
enabled: true
service-id: config-server
server:
port: 8881
eureka:
client:
service-url:
defaultZone: http://localhost:8889/eureka/
spring.cloud.config.discovery.enabled 是從配置中心讀取文件。
spring.cloud.config.discovery.serviceId 配置中心的servieId,即服務名。
這時發現,在讀取配置文件不再寫ip地址,而是服務名,這時如果配置服務部署多份,通過負載均衡,從而高可用。
依次啓動eureka-servr,config-server,config-client
訪問網址:http://localhost:8889/
訪問http://localhost:8881/hi,瀏覽器顯示:
dev
源碼下載:https://github.com/gf-huanchupk/SpringCloudLearning
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