在.net項目中使用Consul

一、建立.net core web程序並運行

二、在Consul中註冊該服務

　　Consul支持兩種服務註冊的方式，一種是經過Consul的服務註冊HTTP API，由服務自身在啓動後調用API註冊本身，另一種則是經過在配置文件中定義服務的方式進行註冊。Consul文檔中建議使用後面一種方式來作服務 配置和服務註冊。Consul agent在啓動時能夠經過-config-dir來指定配置文件所在目錄（引用自網絡）

[root@linux5 ~]# consul agent -data-dir=/tmp/consul/ -node=consul5 -dc=dc1 -bind=192.168.56.105 -ui -config-dir=/tmp/consul/

在Consul啓動時會讀取-config-dir目錄下全部的json文件來加載註冊的服務，如今在該目錄下建立一個配置文件：jw.json

{
  "service": {
    "name": "jw",
    "tags": ["jiewus"],
    "address": "192.168.56.1",
    "port": 1234,
    "checks": [
      {
        "http": "http://192.168.56.1:1234/Home/About",
        "interval": "10s"
      }
    ]
  }
}

重啓Consul以後會發現jw這個服務：

    2017/05/10 13:59:37 [INFO] serf: EventMemberJoin: consul3 192.168.56.103
    2017/05/10 13:59:37 [INFO] serf: EventMemberJoin: consul2 192.168.56.102
    2017/05/10 13:59:37 [INFO] serf: EventMemberJoin: consul1 192.168.56.101
    2017/05/10 13:59:37 [INFO] serf: Re-joined to previously known node: consul1: 192.168.56.101:8301
    2017/05/10 13:59:37 [INFO] consul: adding server consul3 (Addr: tcp/192.168.56.103:8300) (DC: dc1)
    2017/05/10 13:59:37 [INFO] consul: adding server consul2 (Addr: tcp/192.168.56.102:8300) (DC: dc1)
    2017/05/10 13:59:37 [INFO] consul: adding server consul1 (Addr: tcp/192.168.56.101:8300) (DC: dc1)
    2017/05/10 13:59:38 [INFO] agent: Synced service 'jiewusWeb'
    2017/05/10 13:59:41 [INFO] agent: Synced check 'service:jiewusWeb'
==> Newer Consul version available: 0.8.2 (currently running: 0.8.1)

 三、使用Consul Api進行服務註冊

private static void ServiceRegister(ConsulClient client)
{
    var client = new ConsulClient(ConfigurationOverview);
    var result = client.Agent.ServiceRegister(new AgentServiceRegistration()
    {
        Address = "http://192.168.56.1:1234/Home/About",
        ID = "jw",
        Name = "jw",
        Port = 1234,
        Tags = new[] { "jiewus" },
        Check = new AgentServiceCheck()
        {
            HTTP = "http://192.168.56.1:1234/Home/About",
            Interval = new TimeSpan(0, 0, 10),
            DeregisterCriticalServiceAfter = new TimeSpan(0, 1, 0),
        }
    }).Result;
}

private static void ConfigurationOverview(ConsulClientConfiguration obj)
{
    obj.Address = new Uri("http://192.168.56.104");
    obj.Datacenter = "dc1";
}