博客> Spring Cloud Spring Boot mybatis 企业分布式微服务云(二)服务注册与发现(Consul)
Spring Cloud Spring Boot mybatis 企业分布式微服务云(二)服务注册与发现(Consul)
2018-10-18 20:28 评论:0 阅读:2323 candyeep
JAVA Spring springcloud springBoot springmvc

Spring Cloud Consul

Spring Cloud Consul项目是针对Consul的服务治理实现。Consul是一个分布式高可用的系统,它包含多个组件,但是作为一个整体,在微服务架构中为我们的基础设施提供服务发现和服务配置的工具。它包含了下面几个特性:

服务发现 健康检查 Key/Value存储 多数据中心 由于Spring Cloud Consul项目的实现,我们可以轻松的将基于Spring Boot的微服务应用注册到Consul上,并通过此实现微服务架构中的服务治理。

以之前实现的基于Eureka的示例(eureka-client)为基础,我们如何将之前实现的服务提供者注册到Consul上呢?方法非常简单,我们只需要在pom.xml中将eureka的依赖修改为如下依赖:

org.springframework.cloud spring-cloud-starter-consul-discovery

接下来再修改一下application.properites,将consul需要的配置信息加入即可,比如:(下面配置是默认值)

spring.cloud.consul.host=localhost spring.cloud.consul.port=8500 到此为止,我们将eureka-client转换为基于consul服务治理的服务提供者就完成了。前文我们已经有提到过服务发现的接口DiscoveryClient是Spring Cloud对服务治理做的一层抽象,所以可以屏蔽Eureka和Consul服务治理的实现细节,我们的程序不需要做任何改变,只需要引入不同的服务治理依赖,并配置相关的配置属性就能轻松的将微服务纳入Spring Cloud的各个服务治理框架中。

下面可以尝试让consul的服务提供者运行起来。这里可能读者会问,不需要创建类似eureka-server的服务端吗?由于Consul自身提供了服务端,所以我们不需要像之前实现Eureka的时候创建服务注册中心,直接通过下载consul的服务端程序就可以使用。

我们可以用下面的命令启动consul的开发模式:

$consul agent -dev ==> Starting Consul agent... ==> Starting Consul agent RPC... ==> Consul agent running! Version: 'v0.7.2' Node name: 'Lenovo-zhaiyc' Datacenter: 'dc1' Server: true (bootstrap: false) Client Addr: 127.0.0.1 (HTTP: 8500, HTTPS: -1, DNS: 8600, RPC: 8400) Cluster Addr: 127.0.0.1 (LAN: 8301, WAN: 8302) Gossip encrypt: false, RPC-TLS: false, TLS-Incoming: false Atlas:

==> Log data will now stream in as it occurs:

2017/06/22 07:50:54 [INFO] raft: Initial configuration (index=1): [{Suffrage:Voter ID:127.0.0.1:8300 Address:127.0.0.1:8300}]
2017/06/22 07:50:54 [INFO] raft: Node at 127.0.0.1:8300 [Follower] entering Follower state (Leader: "")
2017/06/22 07:50:54 [INFO] serf: EventMemberJoin: Lenovo-zhaiyc 127.0.0.1
2017/06/22 07:50:54 [INFO] consul: Adding LAN server Lenovo-zhaiyc (Addr: tcp/127.0.0.1:8300) (DC: dc1)
2017/06/22 07:50:54 [INFO] serf: EventMemberJoin: Lenovo-zhaiyc.dc1 127.0.0.1
2017/06/22 07:50:54 [INFO] consul: Adding WAN server Lenovo-zhaiyc.dc1 (Addr: tcp/127.0.0.1:8300) (DC: dc1)
2017/06/22 07:51:01 [ERR] agent: failed to sync remote state: No cluster leader
2017/06/22 07:51:02 [WARN] raft: Heartbeat timeout from "" reached, starting election
2017/06/22 07:51:02 [INFO] raft: Node at 127.0.0.1:8300 [Candidate] entering Candidate state in term 2
2017/06/22 07:51:02 [DEBUG] raft: Votes needed: 1
2017/06/22 07:51:02 [DEBUG] raft: Vote granted from 127.0.0.1:8300 in term 2. Tally: 1
2017/06/22 07:51:02 [INFO] raft: Election won. Tally: 1
2017/06/22 07:51:02 [INFO] raft: Node at 127.0.0.1:8300 [Leader] entering Leader state
2017/06/22 07:51:02 [INFO] consul: cluster leadership acquired
2017/06/22 07:51:02 [INFO] consul: New leader elected: Lenovo-zhaiyc
2017/06/22 07:51:02 [DEBUG] consul: reset tombstone GC to index 3
2017/06/22 07:51:02 [INFO] consul: member 'Lenovo-zhaiyc' joined, marking health alive
2017/06/22 07:51:02 [INFO] agent: Synced service 'consul'
2017/06/22 07:51:02 [DEBUG] agent: Node info in sync

consul服务端启动完成之后,我们再将之前改造后的consul服务提供者启动起来。

源码来源:http://minglisoft.cn/honghu/technology.html

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