Ubuntu中包含Express，MongoDB和Mongoose的Node.js中的REST API。 MongoError：第一次连接时无法连接到服务器
在运行我的快速应用程序时，遇到以下错误：
bharti@bharti-Inspiron-3542:/media/bharti/New Volume1/Nodejs/rest-server$ npm start > rest-server@0.0.0 start /media/bharti/New Volume1/Nodejs/rest-server > node ./bin/www connection error: { MongoError: failed to connect to server [localhost:27012] on first connect [MongoError: connect ECONNREFUSED 127.0.0.1:27012] at .<anonymous> (/media/bharti/New Volume1/Nodejs/rest-server/node_modules/mongodb-core/lib/topologies/server.js:328:35) at emitOne (events.js:96:13) at emit (events.js:188:7) at .<anonymous> (/media/bharti/New Volume1/Nodejs/rest-server/node_modules/mongodb-core/lib/connection/pool.js:274:12) at g (events.js:286:16) at emitTwo (events.js:106:13) at emit (events.js:191:7) at Socket.<anonymous> (/media/bharti/New Volume1/Nodejs/rest-server/node_modules/mongodb-core/lib/connection/connection.js:177:49) at Socket.g (events.js:286:16) at emitOne (events.js:96:13) at Socket.emit (events.js:188:7) at emitErrorNT (net.js:1271:8) at _combinedTickCallback (internal/process/next_tick.js:74:11) at process._tickCallback (internal/process/next_tick.js:98:9) name: 'MongoError', message: 'failed to connect to server [localhost:27012] on first connect [MongoError: connect ECONNREFUSED 127.0.0.1:27012]' } 最初我在连接MongoDB服务器时遇到了问题，但是我已经通过terminal中的以下命令终止了所有进程：
- sudo killall mongod
以确保目录设置在正确的位置，以便Mongo可以find它：
- sudo mkdir -p / data / db /
- sudo chown
id -u/ data / db
现在我的MongoDB服务器启动并运行了：
bharti@bharti-Inspiron-3542:/media/bharti/New Volume1/Nodejs/mongodb$ mongod --dbpath=data 2017-05-15T05:40:18.099+0530 [initandlisten] MongoDB starting : pid=5170 port=27017 dbpath=data 64-bit host=bharti-Inspiron-3542 2017-05-15T05:40:18.100+0530 [initandlisten] db version v2.6.10 2017-05-15T05:40:18.100+0530 [initandlisten] git version: nogitversion 2017-05-15T05:40:18.100+0530 [initandlisten] OpenSSL version: OpenSSL 1.0.2d 9 Jul 2015 2017-05-15T05:40:18.100+0530 [initandlisten] build info: Linux lgw01-12 3.19.0-25-generic #26~14.04.1-Ubuntu SMP Fri Jul 24 21:16:20 UTC 2015 x86_64 BOOST_LIB_VERSION=1_58 2017-05-15T05:40:18.100+0530 [initandlisten] allocator: tcmalloc 2017-05-15T05:40:18.100+0530 [initandlisten] options: { storage: { dbPath: "data" } } 2017-05-15T05:40:18.134+0530 [initandlisten] journal dir=data/journal 2017-05-15T05:40:18.134+0530 [initandlisten] recover : no journal files present, no recovery needed 2017-05-15T05:40:18.263+0530 [initandlisten] waiting for connections on port 27017
但通过命令行运行我的快速应用程序时仍然有同样的问题：npm start
这里是我的代码：
var express = require('express'); var path = require('path'); var favicon = require('serve-favicon'); var logger = require('morgan'); var cookieParser = require('cookie-parser'); var bodyParser = require('body-parser'); var mongoose = require('mongoose'); var url = 'mongodb://localhost:27012/conFusion'; mongoose.connect(url); var db = mongoose.connection; db.on('error', console.error.bind(console, 'connection error:')); db.once('open', function (){ //we are connected! console.log("Connected correctly to server"); }); var routers = require('./routes/index'); var users = require('./routes/users'); var dishRouter = require('./routes/dishRouter'); var promoRouter = require('./routes/promoRouter'); var leaderRouter = require('./routes/leaderRouter'); var app = express(); // view engine setup app.set('views', path.join(__dirname, 'views')); app.set('view engine', 'jade'); // uncomment after placing your favicon in /public //app.use(favicon(path.join(__dirname, 'public', 'favicon.ico'))); app.use(logger('dev')); app.use(bodyParser.json()); app.use(bodyParser.urlencoded({ extended: false })); app.use(cookieParser()); app.use(express.static(path.join(__dirname, 'public'))); app.use('/', routers); app.use('/users', users); app.use('/dishes', dishRouter); app.use('/promotions', promoRouter); app.use('/leadership', leaderRouter); // catch 404 and forward to error handler app.use(function(req, res, next) { var err = new Error('Not Found'); err.status = 404; next(err); }); //development error handler // will print stacktrace if (app.get('env') === 'development'){ app.use(function(err, req, res, next) { res.status(err.status || 500); res.render('error', { message: err.message, error: err }); }); } 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 : {}; res.status(err.status || 500); res.render('error', { message: err.message, error: err }); }); module.exports = app;
我看到你有mongod中的port = 27017，而你的代码中有27012。 更改
var url = 'mongodb://localhost:27012/conFusion';
至
var url = 'mongodb://localhost:27017/conFusion';
您正在使用默认的mongDB端口，即27017.确定运行命令并find默认的端口号
sudo lsof -iTCP -sTCP：LISTEN | grep mongo
输出可能是：localhost：27017（Listen）。 如果端口号为27017，则将端口号27012更改为27017。
更改
var url = 'mongodb://localhost:27012/conFusion';
至
var url = 'mongodb://localhost:27017/conFusion';
除此以外
如果要将默认端口从27017更改为27012，则
sudo gedit /etc/mongod.conf
将端口号更改为27012，并且与代码无关。 你可以看看mongoDB的端口号 。