Heroku - Mongoose App 不断收到同样的错误：MongoError: failed to connect to server [process.env.MONGOLAB_URI:*****] on first connect

Question

这里是 heroku 日志。我现在已经连续 7 次尝试连接失败，并且应用程序无法运行。是什么赋予了？我正在尝试将此后端 API 应用程序部署到 heroku。

我还安装了我所有的包，包括 mongoose-unique-validator。

2016-10-04T22:38:20.978272+00:00 heroku[web.1]: Starting process with 

command `npm start`
2016-10-04T22:38:24.273558+00:00 app[web.1]: 
2016-10-04T22:38:24.273583+00:00 app[web.1]: > roomie_api@1.0.0 start /app
2016-10-04T22:38:24.273584+00:00 app[web.1]: > node index.js
2016-10-04T22:38:24.273585+00:00 app[web.1]: 
2016-10-04T22:38:25.332290+00:00 app[web.1]: 
2016-10-04T22:38:25.332301+00:00 app[web.1]: /app/node_modules/mongodb/lib/server.js:261
2016-10-04T22:38:25.332303+00:00 app[web.1]:         process.nextTick(function() { throw err; })
2016-10-04T22:38:25.332303+00:00 app[web.1]:                                       ^
2016-10-04T22:38:25.334773+00:00 app[web.1]: MongoError: failed to connect to server [process.env.MONGOLAB_URI:*****] on first connect
2016-10-04T22:38:25.334775+00:00 app[web.1]:     at null.<anonymous> (/app/node_modules/mongodb-core/lib/topologies/server.js:313:35)
2016-10-04T22:38:25.334776+00:00 app[web.1]:     at emitOne (events.js:90:13)
2016-10-04T22:38:25.334777+00:00 app[web.1]:     at emit (events.js:182:7)
2016-10-04T22:38:25.334777+00:00 app[web.1]:     at null.<anonymous> (/app/node_modules/mongodb-core/lib/connection/pool.js:260:12)
2016-10-04T22:38:25.334778+00:00 app[web.1]:     at g (events.js:273:16)
2016-10-04T22:38:25.334779+00:00 app[web.1]:     at emitTwo (events.js:100:13)
2016-10-04T22:38:25.334779+00:00 app[web.1]:     at emit (events.js:185:7)
2016-10-04T22:38:25.334780+00:00 app[web.1]:     at Socket.<anonymous> (/app/node_modules/mongodb-core/lib/connection/connection.js:162:49)
2016-10-04T22:38:25.334780+00:00 app[web.1]:     at Socket.g (events.js:273:16)
2016-10-04T22:38:25.334781+00:00 app[web.1]:     at emitOne (events.js:90:13)
2016-10-04T22:38:25.334781+00:00 app[web.1]:     at Socket.emit (events.js:182:7)
2016-10-04T22:38:25.334782+00:00 app[web.1]:     at connectErrorNT (net.js:1010:8)
2016-10-04T22:38:25.334783+00:00 app[web.1]:     at _combinedTickCallback (internal/process/next_tick.js:74:11)
2016-10-04T22:38:25.334784+00:00 app[web.1]:     at process._tickCallback (internal/process/next_tick.js:98:9)
2016-10-04T22:38:25.357010+00:00 app[web.1]: 
2016-10-04T22:38:25.374557+00:00 app[web.1]: npm ERR! Linux 3.13.0-95-generic
2016-10-04T22:38:25.377519+00:00 app[web.1]: npm ERR! argv "/app/.heroku/node/bin/node" "/app/.heroku/node/bin/npm" "start"
2016-10-04T22:38:25.377837+00:00 app[web.1]: npm ERR! node v5.11.1
2016-10-04T22:38:25.378727+00:00 app[web.1]: npm ERR! npm  v3.8.6
2016-10-04T22:38:25.378996+00:00 app[web.1]: npm ERR! code ELIFECYCLE
2016-10-04T22:38:25.379139+00:00 app[web.1]: npm ERR! roomie_api@1.0.0 start: `node index.js`
2016-10-04T22:38:25.379318+00:00 app[web.1]: npm ERR! Exit status 1
2016-10-04T22:38:25.379514+00:00 app[web.1]: npm ERR! 
2016-10-04T22:38:25.379699+00:00 app[web.1]: npm ERR! Failed at the roomie_api@1.0.0 start script 'node index.js'.
2016-10-04T22:38:25.379885+00:00 app[web.1]: npm ERR! Make sure you have the latest version of node.js and npm installed.
2016-10-04T22:38:25.380406+00:00 app[web.1]: npm ERR! Tell the author that this fails on your system:
2016-10-04T22:38:25.380060+00:00 app[web.1]: npm ERR! If you do, this is most likely a problem with the roomie_api package,
2016-10-04T22:38:25.380227+00:00 app[web.1]: npm ERR! not with npm itself.
2016-10-04T22:38:25.380596+00:00 app[web.1]: npm ERR!     node index.js
2016-10-04T22:38:25.380769+00:00 app[web.1]: npm ERR! You can get information on how to open an issue for this project with:
2016-10-04T22:38:25.380946+00:00 app[web.1]: npm ERR!     npm bugs roomie_api
2016-10-04T22:38:25.381111+00:00 app[web.1]: npm ERR! Or if that isn't available, you can get their info via:
2016-10-04T22:38:25.381291+00:00 app[web.1]: npm ERR!     npm owner ls roomie_api
2016-10-04T22:38:25.381460+00:00 app[web.1]: npm ERR! There is likely additional logging output above.
2016-10-04T22:38:25.393677+00:00 app[web.1]: 
2016-10-04T22:38:25.393683+00:00 app[web.1]: npm ERR! Please include the following file with any support request:
2016-10-04T22:38:25.393684+00:00 app[web.1]: npm ERR!     /app/npm-debug.log
2016-10-04T22:38:25.528779+00:00 heroku[web.1]: State changed from starting to crashed
2016-10-04T22:38:25.518263+00:00 heroku[web.1]: Process exited with status 1
2016-10-04T22:43:00.087160+00:00 heroku[api]: Deploy 504f79b by ************
2016-10-04T22:43:00.087217+00:00 heroku[api]: Release v9 created by ****************
2016-10-04T22:43:00.262314+00:00 heroku[slug-compiler]: Slug compilation started
2016-10-04T22:43:00.262323+00:00 heroku[slug-compiler]: Slug compilation finished
2016-10-04T22:43:00.509478+00:00 heroku[web.1]: State changed from crashed to starting
2016-10-04T22:43:01.920370+00:00 heroku[web.1]: Starting process with command `npm start`
2016-10-04T22:43:03.921615+00:00 app[web.1]: 
2016-10-04T22:43:03.921629+00:00 app[web.1]: > roomie_api@1.0.0 start /app
2016-10-04T22:43:03.921630+00:00 app[web.1]: > nodemon index.js
2016-10-04T22:43:03.921631+00:00 app[web.1]: 
2016-10-04T22:43:04.226979+00:00 app[web.1]: [nodemon] 1.10.2
2016-10-04T22:43:04.230852+00:00 app[web.1]: [nodemon] to restart at any time, enter `rs`
2016-10-04T22:43:04.230854+00:00 app[web.1]: [nodemon] watching: *.*
2016-10-04T22:43:04.230855+00:00 app[web.1]: [nodemon] starting `node index.js`
2016-10-04T22:43:04.800845+00:00 app[web.1]: 
2016-10-04T22:43:04.800856+00:00 app[web.1]: /app/node_modules/mongodb/lib/server.js:261
2016-10-04T22:43:04.800857+00:00 app[web.1]:         process.nextTick(function() { throw err; })
2016-10-04T22:43:04.800858+00:00 app[web.1]:                                       ^
2016-10-04T22:43:04.801623+00:00 app[web.1]: MongoError: failed to connect to server [localhost:27017] on first connect
2016-10-04T22:43:04.801625+00:00 app[web.1]:     at null.<anonymous> (/app/node_modules/mongodb-core/lib/topologies/server.js:313:35)
2016-10-04T22:43:04.801626+00:00 app[web.1]:     at emitOne (events.js:90:13)
2016-10-04T22:43:04.801627+00:00 app[web.1]:     at emit (events.js:182:7)
2016-10-04T22:43:04.801628+00:00 app[web.1]:     at null.<anonymous> (/app/node_modules/mongodb-core/lib/connection/pool.js:260:12)
2016-10-04T22:43:04.801628+00:00 app[web.1]:     at g (events.js:273:16)
2016-10-04T22:43:04.801629+00:00 app[web.1]:     at emitTwo (events.js:100:13)
2016-10-04T22:43:04.801629+00:00 app[web.1]:     at emit (events.js:185:7)
2016-10-04T22:43:04.801644+00:00 app[web.1]:     at Socket.<anonymous> (/app/node_modules/mongodb-core/lib/connection/connection.js:162:49)
2016-10-04T22:43:04.801645+00:00 app[web.1]:     at Socket.g (events.js:273:16)
2016-10-04T22:43:04.801645+00:00 app[web.1]:     at emitOne (events.js:90:13)
2016-10-04T22:43:04.801646+00:00 app[web.1]:     at Socket.emit (events.js:182:7)
2016-10-04T22:43:04.801646+00:00 app[web.1]:     at emitErrorNT (net.js:1265:8)
2016-10-04T22:43:04.801647+00:00 app[web.1]:     at _combinedTickCallback (internal/process/next_tick.js:74:11)
2016-10-04T22:43:04.801648+00:00 app[web.1]:     at process._tickCallback (internal/process/next_tick.js:98:9)
2016-10-04T22:43:04.806979+00:00 app[web.1]: [nodemon] app crashed - waiting for file changes before starting...

这是我在节点 index.js 中的设置：

var express = require("express");
var app = express();
var mongoose = require("mongoose");
var port = process.env.PORT || 7000;
var bodyParser = require("body-parser");
var cors = require("cors");
var expressJWT = require("express-jwt");
var uri = process.env.MONGOLAB_URI || process.env.MONGOHQ_URL || 'mongodb://localhost/roomietrack'
var db = mongoose.connect(uri);
var User = require("./models/user.model");
var Request = require("./models/request.model");
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended: false}))
app.use(cors());

Answer 1

您的最后一个错误（基于时间戳）是

MongoError: 无法连接到服务器 [localhost:27017]

它会在您最近部署 504f79b 后尝试连接到 localhost，所以我会假设 process.env.MONGOLAB_URI:***** 可能是您的代码上已修复的先前错误。

你确定你添加了 mongolab 插件吗？

另外，您确定您已正确设置MONGOLAB_URI 环境设置吗？

您可以在 heroku 仪表板上转到您的应用“设置”页面或使用 cli 来查看它

$ heroku config --app your_heroku_app_name_here

Answer 2

您必须在另一个终端中单独启动服务器。 通过在命令提示符下运行命令“mongod”，您可以做到这一点