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。
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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。
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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。
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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 }
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健康检查（checks）：
script check：consul主动去检查服务的健康状况1 { 2 "check": { 3 "id": "scheck", 4 "name": "scheck", 5 "script": "/*.py", //必须 6 "interval": "10s", //必须 7 "timeout": "1s" 8 } 9 }
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 }
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服务注册：
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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）
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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
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maven dependency：
1 <dependency> 2 <groupId>com.orbitz.consul</groupId> 3 <artifactId>consul-client</artifactId> 4 <version>xxx</version> 5 </dependency>
1 <dependency> 2 <groupId>com.ecwid.consul</groupId> 3 <artifactId>consul-api</artifactId> 4 <version>xxx</version> 5 </dependency>
项目地址：https://github.com/windwant/windwant-service/tree/master/consul-service