如何使用Gremlin配置Cassandra db进行远程连接？不工作

Question

我在节点Js中使用Cassandra DB，DSE图形，gremlin查询。我能够获得价值并访问本地主机上的数据库。每当我尝试连接到远程服务器（例如http://remoteservercassandra.in）都无法连接。我如何连接到远程服务器？

我的代码是

var dse = require('dse-driver'); 

var client = new dse.Client({ 
    contactPoints: ['127.0.0.1'], 
    authProvider: new dse.auth.DsePlainTextAuthProvider('username','password'), 
    protocolOptions: { 
    port: 9042 
    }, 
    graphOptions: { 
    name: 'mygraphname' 
    } 
}); 

当我试图得到这个错误

{ 
    "innerErrors": null, 
    "info": "Represents an error when a query cannot be performed because no host is available or could be reached by the driver.", 
    "message": "No host could be resolved" 
} 

如果我试图连接我的远程服务器URL（例如http://remoteservercassandra.in）我得到这个错误。

var dse = require('dse-driver'); 

var client = new dse.Client({ 
    contactPoints: ['remoteservercassandra.in'], 
    authProvider: new dse.auth.DsePlainTextAuthProvider('username','password'), 
    protocolOptions: { 
    port: 9042 
    }, 
    graphOptions: { 
    name: 'mygraphname' 
    } 
}); 

我得到这个错误。

{ 
    "innerErrors": { 
     "12.234.78.134:9042": { // based on host name this IP address 
      "code": "ECONNREFUSED", 
      "errno": "ECONNREFUSED", 
      "syscall": "connect", 
      "address": "12.234.78.134", 
      "port": 9042 
     } 
    }, 
    "info": "Represents an error when a query cannot be performed because no host is available or could be reached by the driver.", 
    "message": "All host(s) tried for query failed. First host tried, 12.234.78.134:9042: Error: connect ECONNREFUSED 12.234.78.134:9042. See innerErrors." 
} 

我怎样才能解决这个错误，以及如何连接到远程服务器？远程服务器正在运行并侦听正确的接口上

Answer 1

确认：

lsof -i:9042

乍一看，这看起来像一个RPC_ADRESS问题。