MongoError: failed to connect to server [localhost:27017] on first connect

MongoError: failed to connect to server [localhost:27017] on first connect

我已经付费会员并下载了this project。在 npm install 和 node app.js 之后，它 returns 出现以下错误：

有人知道怎么回事吗？

/Users/Thomas/Desktop/mean-stack-tutorial-01$ node app.js 

/Users/Thomas/Desktop/mean-stack-tutorial-01/node_modules/mongodb/lib/server.js:265
        process.nextTick(function() { throw err; })
                                      ^
MongoError: failed to connect to server [localhost:27017] on first connect
    at Pool.<anonymous> (/Users/Thomas/Desktop/mean-stack-tutorial-01/node_modules/mongodb-core/lib/topologies/server.js:325:35)
    at emitOne (events.js:96:13)
    at Pool.emit (events.js:188:7)
    at Connection.<anonymous> (/Users/Thomas/Desktop/mean-stack-tutorial-01/node_modules/mongodb-core/lib/connection/pool.js:270:12)
    at Connection.g (events.js:292:16)
    at emitTwo (events.js:106:13)
    at Connection.emit (events.js:191:7)
    at Socket.<anonymous> (/Users/Thomas/Desktop/mean-stack-tutorial-01/node_modules/mongodb-core/lib/connection/connection.js:173:49)
    at Socket.g (events.js:292:16)
    at emitOne (events.js:96:13)
    at Socket.emit (events.js:188:7)
    at emitErrorNT (net.js:1281:8)
    at _combinedTickCallback (internal/process/next_tick.js:74:11)
    at process._tickCallback (internal/process/next_tick.js:98:9)

编辑 1： 根据评论，我刚刚通过 brew 安装了 mongo，然后 brew services start mongodb 然后 mongo:

/Users/Thomas$ mongo
MongoDB shell version v3.4.1
connecting to: mongodb://127.0.0.1:27017
MongoDB server version: 3.4.1
Server has startup warnings: 
2017-01-12T19:53:01.868+0800 I CONTROL  [initandlisten] 
2017-01-12T19:53:01.869+0800 I CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
2017-01-12T19:53:01.869+0800 I CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
2017-01-12T19:53:01.869+0800 I CONTROL  [initandlisten]

然后我做了

/Users/Thomas$ mongod -httpinterface --dbpath /Users/Thomas/Desktop/MongoDB/db
2017-01-12T20:14:05.620+0800 I CONTROL  [initandlisten] MongoDB starting : pid=47356 port=27017 dbpath=/Users/Thomas/Desktop/MongoDB/db 64-bit host=Pro.local
2017-01-12T20:14:05.621+0800 I CONTROL  [initandlisten] db version v3.4.1
2017-01-12T20:14:05.621+0800 I CONTROL  [initandlisten] git version: 5e103c4f5583e2566a45d740225dc250baacfbd7
2017-01-12T20:14:05.621+0800 I CONTROL  [initandlisten] OpenSSL version: OpenSSL 1.0.2j  26 Sep 2016
2017-01-12T20:14:05.621+0800 I CONTROL  [initandlisten] allocator: system
2017-01-12T20:14:05.621+0800 I CONTROL  [initandlisten] modules: none
2017-01-12T20:14:05.621+0800 I CONTROL  [initandlisten] build environment:
2017-01-12T20:14:05.621+0800 I CONTROL  [initandlisten]     distarch: x86_64
2017-01-12T20:14:05.621+0800 I CONTROL  [initandlisten]     target_arch: x86_64
2017-01-12T20:14:05.621+0800 I CONTROL  [initandlisten] options: { storage: { dbPath: "/Users/Thomas/Desktop/MongoDB/db" } }
2017-01-12T20:14:05.657+0800 I STORAGE  [initandlisten] wiredtiger_open config: create,cache_size=3584M,session_max=20000,eviction=(threads_max=4),config_base=false,statistics=(fast),log=(enabled=true,archive=true,path=journal,compressor=snappy),file_manager=(close_idle_time=100000),checkpoint=(wait=60,log_size=2GB),statistics_log=(wait=0),
2017-01-12T20:14:14.108+0800 I CONTROL  [initandlisten] 
2017-01-12T20:14:14.108+0800 I CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
2017-01-12T20:14:14.108+0800 I CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
2017-01-12T20:14:14.108+0800 I CONTROL  [initandlisten] 
2017-01-12T20:14:14.108+0800 I CONTROL  [initandlisten] 
2017-01-12T20:14:14.109+0800 I CONTROL  [initandlisten] ** WARNING: soft rlimits too low. Number of files is 256, should be at least 1000
2017-01-12T20:14:15.390+0800 I FTDC     [initandlisten] Initializing full-time diagnostic data capture with directory '/Users/Thomas/Desktop/MongoDB/db/diagnostic.data'
2017-01-12T20:14:16.303+0800 I INDEX    [initandlisten] build index on: admin.system.version properties: { v: 2, key: { version: 1 }, name: "incompatible_with_version_32", ns: "admin.system.version" }
2017-01-12T20:14:16.304+0800 I INDEX    [initandlisten]      building index using bulk method; build may temporarily use up to 500 megabytes of RAM
2017-01-12T20:14:16.406+0800 I INDEX    [initandlisten] build index done.  scanned 0 total records. 0 secs
2017-01-12T20:14:16.407+0800 I COMMAND  [initandlisten] setting featureCompatibilityVersion to 3.4
2017-01-12T20:14:16.407+0800 I NETWORK  [thread1] waiting for connections on port 27017

然后在另一个终端中，我做了 node app.js，它挂起（并且不打印任何东西）。然后我在浏览器中执行 http://localhost:28017，它似乎有效：

可是，我怎么能看到网站呢？

编辑 2：

正常流程是

  1. 安装mongo

  2. brew services start mongodb 在终端

  3. mongo &（假设我们使用默认文件夹/data/db/）

  4. npm start

  5. 查看端口号，例如 bin/www，然后在浏览器中使用 localhost:the_port_number

2020 年 2 月 24 日更新：

继续关注它是明智的。这是最新库说明的 link：

https://docs.mongodb.com/manual/administration/install-community/

你还没有启动你的monogo数据库。首先安装 mongo install mongo as per your OS https://docs.mongodb.com/v3.0/tutorial/

然后按照本网站上提到的说明进行操作： https://docs.mongodb.com/v3.0/tutorial/getting-started-with-the-mongo-shell/

  1. 光盘.
  2. mongod --dbpath "any directory path to start your database "

然后启动你的节点服务器。它将正常工作。

希望对您有所帮助！！

首先打开另一个终端一个运行命令mongod来启动你的mongoDB

然后再次启动您的节点服务器 npm start 或者如果您有 "nodemon" 然后使用 nodemon

我想现在一切都会好的它会显示 

Mongoose connected to mongodb://localhost/your_database

我遇到了同样的问题，但重启服务后一切正常

service mongod start