Consul 服務發現和配置

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

服務發現和配置，分布式，高可用性，數據中心。

• 服務注冊 - 服務端注冊相應的的主機、端口號及其它身份驗證信息，協議，版本號，以及運行環境等詳細資料。

• 服務發現 - 客戶端應用通過向注冊中心查詢，獲取可用服務列表，相應服務詳細信息。

• 基本服務格式：

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

• 健康檢查（checks）：
  script check：consul主動去檢查服務的健康狀況
  

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

  ttl check：服務主動向consul報告自己的健康狀況

  {
    "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"
    }
  }

• 服務注冊：

  • 配置文件靜態注冊：/etc/consul.d/myserver.json，

    添加如上服務配置，重啟consul，並將配置文件的路徑給consul（指定參數：-config-dir /etc/consul.d）
    

  • HTTP API接口來動態注冊：/v1/agent/service/register http put方法注冊。

    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>

   

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