consul的具体安装与操作查看博客的consul系列。
一、启动consul
(1个server+1个client,方便起见,client使用本机):查看:http://www.cnblogs.com/java-zhao/p/5375132.html
1、开启虚拟机-->切换到vagrantFile中配置的节点
- vagrant up
- vagrant ssh n110
2、启动server(n110)
-
consul agent -server -bootstrap-expect=1 -data-dir=/tmp/consul -node=server-110 -bind=192.168.21.110 -dc=zjgdc1 -client 0.0.0.0 -ui
说明:-client 0 0 0 0 -ui-->使得客户端可以直接通过url访问服务端的consul ui
3、启动client(local)
- consul agent -data-dir=/tmp/consul -node=client-my -bind=xxx -dc=zjgdc1
说明:xxx代表本机IP
4、client加入server
- consul join 192.168.21.110
二、java部分
1、pom.xml
<!-- consul-client -->
<dependency>
<groupId>com.orbitz.consul</groupId>
<artifactId>consul-client</artifactId>
<version>0.10.0</version>
</dependency>
<!-- consul需要的包 -->
<dependency>
<groupId>org.glassfish.jersey.core</groupId>
<artifactId>jersey-client</artifactId>
<version>2.22.2</version>
</dependency>
说明:consul的java客户端有两个:consul-client和consul-api。
consul-client的github地址:https://github.com/OrbitzWorldwide/consul-client
2、ConsulService
1 package com.xxx.firstboot.service;
2
3 import java.net.MalformedURLException;
4 import java.net.URI;
5 import java.util.List;
6
7 import org.springframework.stereotype.Service;
8
9 import com.orbitz.consul.AgentClient;
10 import com.orbitz.consul.Consul;
11 import com.orbitz.consul.HealthClient;
12 import com.orbitz.consul.KeyValueClient;
13 //import com.orbitz.consul.NotRegisteredException;
14 import com.orbitz.consul.StatusClient;
15 import com.orbitz.consul.model.health.ServiceHealth;
16
17 @Service
18 public class ConsulService {
19
20 /**
21 * 注册服务
22 * 并对服务进行健康检查
23 * servicename唯一
24 * serviceId:没发现有什么作用
25 */
26 public void registerService(String serviceName, String serviceId) {
27 Consul consul = Consul.builder().build(); //建立consul实例
28 AgentClient agentClient = consul.agentClient(); //建立AgentClient
29
30 try {
31 /**
32 * 注意该注册接口:
33 * 需要提供一个健康检查的服务URL,以及每隔多长时间访问一下该服务(这里是3s)
34 */
35 agentClient.register(8080, URI.create("http://localhost:8080/health").toURL(), 3, serviceName, serviceId, "dev");
36 } catch (MalformedURLException e) {
37 e.printStackTrace();
38 }
39 // try {
40 // agentClient.pass(serviceId);//健康检查
41 // } catch (NotRegisteredException e) {
42 // e.printStackTrace();
43 // }
44 }
45
46 /**
47 * 发现可用的服务
48 */
49 public List<ServiceHealth> findHealthyService(String servicename){
50 Consul consul = Consul.builder().build();
51 HealthClient healthClient = consul.healthClient();//获取所有健康的服务
52 return healthClient.getHealthyServiceInstances(servicename).getResponse();//寻找passing状态的节点
53 }
54
55 /**
56 * 存储KV
57 */
58 public void storeKV(String key, String value){
59 Consul consul = Consul.builder().build();
60 KeyValueClient kvClient = consul.keyValueClient();
61 kvClient.putValue(key, value);//存储KV
62 }
63
64 /**
65 * 根据key获取value
66 */
67 public String getKV(String key){
68 Consul consul = Consul.builder().build();
69 KeyValueClient kvClient = consul.keyValueClient();
70 return kvClient.getValueAsString(key).get();
71 }
72
73 /**
74 * 找出一致性的节点(应该是同一个DC中的所有server节点)
75 */
76 public List<String> findRaftPeers(){
77 StatusClient statusClient = Consul.builder().build().statusClient();
78 return statusClient.getPeers();
79 }
80
81 /**
82 * 获取leader
83 */
84 public String findRaftLeader(){
85 StatusClient statusClient = Consul.builder().build().statusClient();
86 return statusClient.getLeader();
87 }
88
89 }
列出了常用API。
注意:
- 服务注册的时候不需要传递IP
- 服务注册的时候需要给出health check的url和时间间隔。该url是一个服务(要提供该服务,需要使用spring boot actuator,具体操作如下:)。
直接在pomx.ml中加入:
1 <dependency> 2 <groupId>org.springframework.boot</groupId> 3 <artifactId>spring-boot-starter-actuator</artifactId> 4 </dependency>
此时重启应用后,访问http://localhost:8080/health,得到如下结果一个json串:
1 {
2 status: "UP",
3 diskSpace: - {
4 status: "UP",
5 total: 249769230336,
6 free: 182003318784,
7 threshold: 10485760
8 },
9 rabbit: - {
10 status: "UP",
11 version: "3.6.1"
12 },
13 mongo: - {
14 status: "UP",
15 version: "3.2.6"
16 },
17 db: - {
18 status: "UP",
19 myTestDbDataSource: - {
20 status: "UP",
21 database: "MySQL",
22 hello: 1
23 },
24 myTestDb2DataSource: - {
25 status: "UP",
26 database: "MySQL",
27 hello: 1
28 },
29 dataSource: - {
30 status: "UP",
31 database: "MySQL",
32 hello: 1
33 }
34 },
35 _links: - {
36 self: - {
37 href: "http://localhost:8080/health"
38 }
39 }
40 }
41 Format online
说明:status
- UP:服务器正常(以上只要有一个组件DOWN,服务器就处于DOWN,所以我需要启动服务器上的mongo和rabbitmq,这里我之前使用了这两个组件)
- DOWN:服务器挂了
3、ConsulController
1 package com.xxx.firstboot.web;
2
3 import java.util.List;
4
5 import org.springframework.beans.factory.annotation.Autowired;
6 import org.springframework.web.bind.annotation.PathVariable;
7 import org.springframework.web.bind.annotation.RequestMapping;
8 import org.springframework.web.bind.annotation.RequestMethod;
9 import org.springframework.web.bind.annotation.RestController;
10
11 import com.orbitz.consul.model.health.ServiceHealth;
12 import com.xxx.firstboot.service.ConsulService;
13
14 import io.swagger.annotations.Api;
15 import io.swagger.annotations.ApiOperation;
16
17 @Api("consul相关API")
18 @RestController
19 @RequestMapping("/consul")
20 public class ConsulController {
21 @Autowired
22 private ConsulService consulService;
23
24 /*******************************服务注册与发现*******************************/
25 @ApiOperation("注册服务")
26 @RequestMapping(value="/registerService/{servicename}/{serviceid}",method=RequestMethod.POST)
27 public void registerService(@PathVariable("servicename") String serviceName,
28 @PathVariable("serviceid") String serviceId) {
29 consulService.registerService(serviceName, serviceId);
30 }
31
32 @ApiOperation("发现服务")
33 @RequestMapping(value="/discoverService/{servicename}",method=RequestMethod.GET)
34 public List<ServiceHealth> discoverService(@PathVariable("servicename") String serviceName) {
35 return consulService.findHealthyService(serviceName);
36 }
37
38 /*******************************KV*******************************/
39 @ApiOperation("store KV")
40 @RequestMapping(value="/kv/{key}/{value}",method=RequestMethod.POST)
41 public void storeKV(@PathVariable("key") String key,
42 @PathVariable("value") String value) {
43 consulService.storeKV(key, value);
44 }
45
46 @ApiOperation("get KV")
47 @RequestMapping(value="/kv/{key}",method=RequestMethod.GET)
48 public String getKV(@PathVariable("key") String key) {
49 return consulService.getKV(key);
50 }
51
52 /*******************************server*******************************/
53 @ApiOperation("获取同一个DC中的所有server节点")
54 @RequestMapping(value="/raftpeers",method=RequestMethod.GET)
55 public List<String> findRaftPeers() {
56 return consulService.findRaftPeers();
57 }
58
59 @ApiOperation("获取leader")
60 @RequestMapping(value="/leader",method=RequestMethod.GET)
61 public String leader() {
62 return consulService.findRaftLeader();
63 }
64 }
4、测试(通过swagger测试+通过consul UI查看结果)
- swagger:http://localhost:8080/swagger-ui.html
- consul UI:http://192.168.21.110:8500/ui/

上图展示了consul UI所展示的所有东西。services、nodes、kv、datacenter
来源:https://www.cnblogs.com/java-zhao/p/5527779.html