领事观察:如何在更改节点地址时运行脚本

Question

我注册了以下领事服务。

curl -s -X GET http://<CONSUL_URL>/v1/catalog/service/myservice | jq .
[
  {
    "ServicePort": 0000,
    "ServiceAddress": "",
    "ServiceTags": null,
    "ServiceName": "myservice",
    "ServiceID": "myservice",
    "Address": "10.3.6.28",
    "Node": "myservice-one"
  },
  {
    "ServicePort": 0000,
    "ServiceAddress": "",
    "ServiceTags": null,
    "ServiceName": "myservice",
    "ServiceID": "myservice",
    "Address": "10.3.6.28",
    "Node": "myservice-main"
  },
  {
    "ServicePort": 0000,
    "ServiceAddress": "",
    "ServiceTags": null,
    "ServiceName": "myservice",
    "ServiceID": "myservice",
    "Address": "10.3.6.26",
    "Node": "myservice-two"
  },
  {
    "ServicePort": 0000,
    "ServiceAddress": "",
    "ServiceTags": null,
    "ServiceName": "myservice",
    "ServiceID": "myservice",
    "Address": "10.3.6.27",
    "Node": "myservice-three"
  }
]

 curl -s -X GET http://10.3.6.21:8500/v1/catalog/node/myservice-main | jq .
{
  "Services": {
    "myservice": {
      "Port": 0000,
      "Address": "",
      "Tags": null,
      "Service": "myservice",
      "ID": "myservice"
    }
  },
  "Node": {
    "Address": "10.3.6.28",
    "Node": "myservice-main"
  }
}

如图所示，在我拥有的myservice服务中有一个Nodemyservice main。当myservice main的地址发生变化时，我想执行一些特定的东西。我读到领事手表可以帮助实现它，但我无法为此编写curl命令。有人能给我指一下我可以用来实现我的需求的http api吗？我只能使用HTTPAPI（curl）和shell脚本，因为我想从远程系统

Answer 1

要执行阻塞查询，您需要查看响应中的X-Consul-Index标头，并将其用作下一个查询的URL中的查询参数。这是文件。

但文档也指出，即使服务没有变化，您的呼叫也可能返回。你必须注意索引数字。

我建议你改为看看consul模板：你会写一个模板文件，里面有你想要监控的所有信息，包括IP地址。一旦这些信息发生变化，执政官模板就会调用您的脚本。