Mongoose 无法连接到 localhost：MongoError: failed to connect to server [127.0.0.1:27017]
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【中文标题】Mongoose 无法连接到 localhost：MongoError: failed to connect to server [127.0.0.1:27017]【英文标题】：Mongoose fails to connect to localhost: MongoError: failed to connect to server [127.0.0.1:27017] 【发布时间】：2017-04-17 00:57:09 【问题描述】：我正在处理从 Github https://github.com/MessagingBots/MessengerBot 下载的 repo，我知道 js 代码很好。
我有一个配置文件将 db URL 指向“mongodb://127.0.0.1:27017/messenger”。 （我还没有创建数据库）
我在 Heroku 上有节点应用程序，但 Heroku Logs 每次在 mongodb 连接时都失败。
2016-12-02T06:23:31.636339+00:00 app[web.1]: mongodb://127.0.0.1:27017/messenger
2016-12-02T06:23:31.672354+00:00 app[web.1]: CALLBACK URL IS
2016-12-02T06:23:31.672434+00:00 app[web.1]: https://cool-scrubland-89690.herokuapp.com/messages/receive/
2016-12-02T06:23:31.683394+00:00 app[web.1]: students
2016-12-02T06:23:31.701863+00:00 app[web.1]: listening on port 3124
2016-12-02T06:23:31.702052+00:00 app[web.1]: Application running at port 48594
2016-12-02T06:23:31.717752+00:00 app[web.1]:
2016-12-02T06:23:31.717764+00:00 app[web.1]: /app/node_modules/mongoose/node_modules/mongodb/lib/server.js:261
2016-12-02T06:23:31.717766+00:00 app[web.1]: process.nextTick(function() throw err; )
2016-12-02T06:23:31.717767+00:00 app[web.1]: ^
2016-12-02T06:23:31.718744+00:00 app[web.1]: MongoError: failed to connect to server [127.0.0.1:27017] on first connect
2016-12-02T06:23:31.718746+00:00 app[web.1]: at Pool.<anonymous> (/app/node_modules/mongoose/node_modules/mongodb-core/lib/topologies/server.js:313:35)
2016-12-02T06:23:31.718747+00:00 app[web.1]: at emitOne (events.js:96:13)
2016-12-02T06:23:31.718747+00:00 app[web.1]: at Pool.emit (events.js:188:7)
2016-12-02T06:23:31.718748+00:00 app[web.1]: at Connection.<anonymous> (/app/node_modules/mongoose/node_modules/mongodb-core/lib/connection/pool.js:271:12)
2016-12-02T06:23:31.718749+00:00 app[web.1]: at Connection.g (events.js:291:16)
2016-12-02T06:23:31.718750+00:00 app[web.1]: at emitTwo (events.js:106:13)
2016-12-02T06:23:31.718750+00:00 app[web.1]: at Connection.emit (events.js:191:7)
2016-12-02T06:23:31.718751+00:00 app[web.1]: at Socket.<anonymous> (/app/node_modules/mongoose/node_modules/mongodb-core/lib/connection/connection.js:165:49)
2016-12-02T06:23:31.718752+00:00 app[web.1]: at Socket.g (events.js:291:16)
2016-12-02T06:23:31.718752+00:00 app[web.1]: at emitOne (events.js:96:13)
2016-12-02T06:23:31.718753+00:00 app[web.1]: at Socket.emit (events.js:188:7)
2016-12-02T06:23:31.718754+00:00 app[web.1]: at emitErrorNT (net.js:1276:8)
2016-12-02T06:23:31.718754+00:00 app[web.1]: at _combinedTickCallback (internal/process/next_tick.js:74:11)
2016-12-02T06:23:31.718755+00:00 app[web.1]: at process._tickCallback (internal/process/next_tick.js:98:9)
2016-12-02T06:24:24.832476+00:00 heroku[web.1]: Error R10 (Boot timeout) -> Web process failed to bind to $PORT within 60 seconds of launch
2016-12-02T06:24:24.832543+00:00 heroku[web.1]: Stopping process with SIGKILL
2016-12-02T06:24:24.958931+00:00 heroku[web.1]: State changed from starting to crashed
2016-12-02T06:24:24.949820+00:00 heroku[web.1]: Process exited with status 137
我有一个 mongod 实例正在运行。 mongod 正确连接到 localhost 并且很稳定
2016-12-02T14:02:26.733+0700 I CONTROL [initandlisten] MongoDB starting : pid=2706 port=27017 dbpath=/data/db 64-bit host=ME.local
2016-12-02T14:02:26.735+0700 I CONTROL [initandlisten] db version v3.2.11
2016-12-02T14:02:26.735+0700 I CONTROL [initandlisten] git version: 009580ad490190ba33d1c6253ebd8d91808923e4
2016-12-02T14:02:26.735+0700 I CONTROL [initandlisten] OpenSSL version: OpenSSL 1.0.2j 26 Sep 2016
2016-12-02T14:02:26.735+0700 I CONTROL [initandlisten] allocator: system
2016-12-02T14:02:26.735+0700 I CONTROL [initandlisten] modules: none
2016-12-02T14:02:26.735+0700 I CONTROL [initandlisten] build environment:
2016-12-02T14:02:26.735+0700 I CONTROL [initandlisten] distarch: x86_64
2016-12-02T14:02:26.735+0700 I CONTROL [initandlisten] target_arch: x86_64
2016-12-02T14:02:26.735+0700 I CONTROL [initandlisten] options:
2016-12-02T14:02:26.738+0700 I - [initandlisten] Detected data files in /data/db created by the 'wiredTiger' storage engine, so setting the active storage engine to 'wiredTiger'.
2016-12-02T14:02:26.739+0700 I STORAGE [initandlisten] wiredtiger_open config: create,cache_size=4G,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),
2016-12-02T14:02:27.758+0700 I CONTROL [initandlisten]
2016-12-02T14:02:27.759+0700 I CONTROL [initandlisten] ** WARNING: soft rlimits too low. Number of files is 256, should be at least 1000
2016-12-02T14:02:27.763+0700 I NETWORK [HostnameCanonicalizationWorker] Starting hostname canonicalization worker
2016-12-02T14:02:27.763+0700 I FTDC [initandlisten] Initializing full-time diagnostic data capture with directory '/data/db/diagnostic.data'
2016-12-02T14:02:27.767+0700 I NETWORK [initandlisten] waiting for connections on port 27017
问题可能与 Mongoose 有关。
谁能帮帮我？
【问题讨论】：
【参考方案1】：你没有在你的 mongoose connect 调用中精确的 mongodb:// ：
mongoose.connect("localhost:27017/mydbname");
【讨论】：
我试过没有mongodb://，但没有结果。谢谢你！还在苦恼中
显示您的代码，并打印以下命令的输出：sudo netstat -atunlp | grep“27017”
终端说命令sudo netstat -atunlp | grep "27017" 不存在（我也尝试过tunlp 和a tunlp，但没有任何结果。我的代码在repo 中github.com/MessagingBots/MessengerBot 我有一个配置文件，指向 db URL ` "dbURL": "localhost:27017/messenger" `
尝试 netstat，如果找不到命令安装 netstat，（对于 debian 版本 sudo apt-get install netstat）
netstat 提供“活跃的互联网连接”和数百个地址。没有引用端口 27017【参考方案2】：
查看是否存在旧的锁定文件（如果存在），然后将其删除 sudo rm /var/lib/mongodb/mongod.lock 看看这是否适合你 sudo mongod --repair and (sudo start mongodb or sudo service mongodb start)
【讨论】：
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