在 heroku 上启动 node/redis/socket 应用程序时出现问题答案

【问题标题】：issues launching a node/redis/socket app onto heroku在 heroku 上启动 node/redis/socket 应用程序时出现问题
【发布时间】：2015-04-23 07:32:59
【问题描述】：

我正在尝试在 Heroku 上启动我的应用程序，但在一些地方被挂断了。我已经使用提供的“node.js”进程设置了应用程序，并且正在使用插件“Redis Cloud”，但它被挂断了。

使用heroku logs --tail我收到一长串错误消息，但其中大部分来自我没有编写或接触过的node_modules。

类似的错误发生了几 (3) 次，但它的一般结构是：

2015-04-22T22:36:03.497059+00:00 heroku[web.1]: State changed from crashed to starting
2015-04-22T22:36:05.119390+00:00 heroku[web.1]: Starting process with command `node app.js`
2015-04-22T22:36:06.597719+00:00 app[web.1]: Recommending WEB_CONCURRENCY=1
2015-04-22T22:36:06.597695+00:00 app[web.1]: Detected 512 MB available memory, 512 MB limit per process (WEB_MEMORY)
2015-04-22T22:36:07.093093+00:00 app[web.1]: events.js:72
2015-04-22T22:36:07.093394+00:00 app[web.1]:               ^
2015-04-22T22:36:07.092975+00:00 app[web.1]: 
2015-04-22T22:36:07.095896+00:00 app[web.1]:     at process._tickCallback (node.js:442:13)
2015-04-22T22:36:07.095887+00:00 app[web.1]: Error: Redis connection to 127.0.0.1:6379 failed - connect ECONNREFUSED
2015-04-22T22:36:07.095890+00:00 app[web.1]:     at RedisClient.on_error (/app/node_modules/redis/index.js:196:24)
2015-04-22T22:36:07.095891+00:00 app[web.1]:     at Socket.<anonymous> (/app/node_modules/redis/index.js:106:14)
2015-04-22T22:36:07.095894+00:00 app[web.1]:     at net.js:441:14
2015-04-22T22:36:07.095893+00:00 app[web.1]:     at Socket.emit (events.js:95:17)
2015-04-22T22:36:07.093363+00:00 app[web.1]:         throw er; // Unhandled 'error' event
2015-04-22T22:36:07.090979+00:00 app[web.1]: listening on *:15286
2015-04-22T22:36:07.894314+00:00 heroku[web.1]: State changed from crashed to starting
2015-04-22T22:36:07.893549+00:00 heroku[web.1]: State changed from starting to crashed
2015-04-22T22:36:07.878999+00:00 heroku[web.1]: Process exited with status 8
2015-04-22T22:36:09.837516+00:00 heroku[web.1]: Starting process with command `node app.js`
2015-04-22T22:36:11.600503+00:00 app[web.1]: Recommending WEB_CONCURRENCY=1
2015-04-22T22:36:11.600483+00:00 app[web.1]: Detected 512 MB available memory, 512 MB limit per process (WEB_MEMORY)
2015-04-22T22:36:12.312046+00:00 app[web.1]: 
2015-04-22T22:36:12.312797+00:00 app[web.1]:         throw er; // Unhandled 'error' event
2015-04-22T22:36:12.320402+00:00 app[web.1]:     at Socket.emit (events.js:95:17)
2015-04-22T22:36:12.320405+00:00 app[web.1]:     at process._tickCallback (node.js:442:13)
2015-04-22T22:36:12.320394+00:00 app[web.1]: Error: Redis connection to 127.0.0.1:6379 failed - connect ECONNREFUSED
2015-04-22T22:36:12.320398+00:00 app[web.1]:     at RedisClient.on_error (/app/node_modules/redis/index.js:196:24)
2015-04-22T22:36:12.320400+00:00 app[web.1]:     at Socket.<anonymous> (/app/node_modules/redis/index.js:106:14)
2015-04-22T22:36:12.320403+00:00 app[web.1]:     at net.js:441:14
2015-04-22T22:36:12.312260+00:00 app[web.1]: events.js:72
2015-04-22T22:36:12.308956+00:00 app[web.1]: listening on *:15286
2015-04-22T22:36:12.313581+00:00 app[web.1]:               ^
2015-04-22T22:36:13.172938+00:00 heroku[web.1]: State changed from starting to crashed
2015-04-22T22:36:13.163265+00:00 heroku[web.1]: Process exited with status 8

还有一些其他错误可能会或可能不会相关，但它们是模糊的（code=H10 似乎只是表明存在问题......不是问题所在）。

2015-04-22T14:57:01.110155+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=appName.herokuapp.com request_id=2b8587e3-f519-45e7-bb9f-5f0953e9440a fwd="50.150.70.220" dyno= connect= service= status=503 bytes=
2015-04-22T14:57:02.558241+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=appName.herokuapp.com request_id=d0e44873-30cb-4a34-94ed-bcc754927dd7 fwd="50.150.70.220" dyno= connect= service= status=503 bytes=
2015-04-22T21:47:17.963341+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=appName.herokuapp.com request_id=d320b50b-0926-4de7-83d0-a9a4208fb6c5 fwd="38.140.30.202" dyno= connect= service= status=503 bytes=
2015-04-22T21:47:19.564687+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=appName.herokuapp.com request_id=9307e6c0-2731-438d-abae-9266634b05ba fwd="38.140.30.202" dyno= connect= service= status=503 bytes=

那么，这些信息是否足以确定这是否是应用挂起的原因/位置？

【问题讨论】：

标签： heroku redis node-modules

【解决方案1】：

鉴于此：

Error: Redis connection to 127.0.0.1:6379 failed - connect ECONNREFUSED

表明您的代码正在尝试建立与本地 Redis 服务器的连接。在 Heroku 上使用 Redis Cloud 时，您需要打开与 Redis 数据库的连接，其端点和密码存储在 REDISCLOUD_URL 环境变量中。

【讨论】：