无法从express（Node.js）远程连接到gremlin服务器

我已经在我的数据中心的Linux虚拟机中设置了一个Janusgraph Docker实例（

Janusgraph/Janusgraph:latest

-Lucene/BerkeleyDB/Tinkerpop/Gremlin Server）。在同一个VM和笔记本电脑上，我运行了相同的JanusGraph Docker映像，但运行了gremlin控制台（调整

conf/remote.yaml

以指向gremlin服务器），并成功地将air-routes.graphml导入服务器实例。我还可以通过一些简单的遍历成功地查询航线数据。 总之：我确信服务器正在运行，有数据，可以远程连接并响应遍历

我已经被困在下一步很久很久了：

我已经创建了一个基本的Node express存根：

var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
var gremlin = require('gremlin');
const DriverRemoteConnection = gremlin.driver.DriverRemoteConnection;
const traversal = gremlin.process.AnonymousTraversalSource.traversal;

var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/', indexRouter);
app.use('/users', usersRouter);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;
const g = traversal().withRemote(
 new DriverRemoteConnection('ws://mygremlinserverhost:8182/gremlin'));

此操作失败，原因如下：

npm run start
greg:air-routes/ $ npm run start                                                                                                                             [21:07:39]
Debugger attached.

> air-routes@0.0.0 start
> node ./bin/www

Debugger attached.
Waiting for the debugger to disconnect...
node:internal/process/promises:227
          triggerUncaughtException(err, true /* fromPromise */);
          ^

Error: connect ECONNREFUSED <The IP of the VM>:8182
    at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1138:16) {
  errno: -61,
  code: 'ECONNREFUSED',
  syscall: 'connect',
  address: '<The IP of the VM>',
  port: 8182
}
Waiting for the debugger to disconnect...
greg:air-routes/ $     

---

我认为无法连接是因为我没有在服务器的

docker run

命令中指定到OS端口的docker端口映射

应该是（使用端口映射开关

-p

）

---

docker-run--name janusgraph default-p 8182:8182--volume/myLocalDir/gremlin:/dataImports janusgraph/janusgraph:latest

此外，在我运行

npm安装-g--save gremlin之前，还应添加
node:internal/process/promises:227
          triggerUncaughtException(err, true /* fromPromise */);
          ^