Consul

 “Consul is a distributed, highly available, and data center aware solution to connect and confifigure applications across dynamic, distributed infrastructure.” - Reference

关键特性

• 服务发现
• 健康检查
• KV 存储
• 多数据中心支持
• 安全的服务间通信（以加密的方式完成应用间的交互）

使用 Consul 提供服务发现能力

• HTTP API （以HTTP的方式做服务的注册于发现，类似Eurak）
• DNS（ xxx.service.consul ）
• 与 Nginx 联动，比如 ngx_http_consul_backend_module

通过 Docker 启动 Consul

docker pull consul
docker run --name consul -d -p 8500:8500 -p 8600:8600/udp consul

Provider 端
依赖

		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-consul-discovery</artifactId>
		</dependency>
		<!-- 用户Consul 的健康监测 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-actuator</artifactId>
		</dependency>

bootstrap.properties

spring.application.name=waiter-service

application.properties

spring.jpa.hibernate.ddl-auto=none
spring.jpa.properties.hibernate.show_sql=true
spring.jpa.properties.hibernate.format_sql=true

management.endpoints.web.exposure.include=*
management.endpoint.health.show-details=always

info.app.author=DigitalSonic
info.app.encoding=@project.build.sourceEncoding@

server.port=0

#consul相关配置
spring.cloud.consul.host=localhost
spring.cloud.consul.port=8500
spring.cloud.consul.discovery.prefer-ip-address=true

测试

//localhost:8500


//dns测试 （解析域名）
dig @127.0.0.1 -p 8600 waiter-service.service.consul

Customer 端
依赖

		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-consul-discovery</artifactId>
		</dependency>

bootstrap.properties

spring.application.name=customer-service

application.properties

server.port=0

management.endpoint.health.show-details=always

spring.cloud.consul.host=localhost
spring.cloud.consul.port=8500
spring.cloud.consul.discovery.prefer-ip-address=true