Consul 服务发现和配置

Service discovery and configuration made easy. Distributed, highly available, and datacenter-aware.

服务发现和配置，分布式，高可用性，数据中心。

服务注册 - 服务端注册相应的的主机、端口号及其它身份验证信息，协议，版本号，以及运行环境等详细资料。
服务发现 - 客户端应用通过向注册中心查询，获取可用服务列表，相应服务详细信息。
基本服务格式：

 1 {
 2   "service":{
 3     "id": "myservice",
 4     "name": "myservice",
 5     "address": "servicehost",
 6     "port": serviceport,
 7     "tags": ["tag"],
 8     "checks": [
 9         {
10             "http": "http://host.port/health",
11             "interval": "5s"
12         }
13     ]
14   }
15 }

健康检查（checks）： script check：consul主动去检查服务的健康状况 ttl check：服务主动向consul报告自己的健康状况 1 { 2 "check": { 3 "id": "scheck", 4 "name": "scheck", 5 "notes": "scheck", 6 "ttl": "30s" 7 } 8 } http check: 1 { 2 "check": { 3 "id": "scheck", 4 "name": "scheck", 5 "http": "http://host:port/health", 6 "interval": "10s", 7 "timeout": "1s" 8 } 9 } tcp check： 1 { 2 "check": { 3 "id": "scheck", 4 "name": "scheck", 5 "tcp": "host:22", 6 "interval": "10s", 7 "timeout": "1s" 8 } 9 }

1 {
2   "check": {
3     "id": "scheck",
4     "name": "scheck",
5     "script": "/*.py", //必须
6     "interval": "10s", //必须
7     "timeout": "1s"
8   }
9 }

服务注册：
- 配置文件静态注册：/etc/consul.d/myserver.json，添加如上服务配置，重启consul，并将配置文件的路径给consul（指定参数：-config-dir /etc/consul.d）
- HTTP API接口来动态注册：/v1/agent/service/register http put方法注册。 curl -X PUT -d '{"id": "myserver","name": "myserver","address": "serverhost","port": serverport,"tags": ["tag"],"checks": [{"http": "http://healthhost:port/health","interval": "5s"}]}' http://host:8500/v1/agent/service/register
maven dependency： 1 <dependency> 2 <groupId>com.ecwid.consul</groupId> 3 <artifactId>consul-api</artifactId> 4 <version>xxx</version> 5 </dependency>

1 <dependency>
2     <groupId>com.orbitz.consul</groupId>
3     <artifactId>consul-client</artifactId>
4     <version>xxx</version>
5 </dependency>

项目地址：https://github.com/windwant/windwant-service/tree/master/consul-service