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：

  {
    "service":{
      "id": "myservice",
      "name": "myservice",
      "address": "servicehost",
      "port": serviceport,
      "tags": ["tag"],
      "checks": [
          {
              "http": "http://host.port/health",
              "interval": "5s"
          }
      ]
    }
  }

• 健康检查（checks）：
  script check：consul主动去检查服务的健康状况
  

  {
    "check": {
      "id": "scheck",
      "name": "scheck",
      "script": "/*.py", //必须
      "interval": "10s", //必须
      "timeout": "1s"
    }
  }

  ttl check：服务主动向consul报告自己的健康状况

  {
    "check": {
      "id": "scheck",
      "name": "scheck",
      "notes": "scheck",
      "ttl": "30s"
    }
  }

  http check:
  

  {
    "check": {
      "id": "scheck",
      "name": "scheck",
      "http": "http://host:port/health",
      "interval": "10s",
      "timeout": "1s"
    }
  }

  tcp check：

  {
    "check": {
      "id": "scheck",
      "name": "scheck",
      "tcp": "host:22",
      "interval": "10s",
      "timeout": "1s"
    }
  }

• 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：
  

  <dependency>
      <groupId>com.orbitz.consul</groupId>
      <artifactId>consul-client</artifactId>
      <version>xxx</version>
  </dependency>

  <dependency>
      <groupId>com.ecwid.consul</groupId>
      <artifactId>consul-api</artifactId>
      <version>xxx</version>
  </dependency>

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