[错误：无法连接到 [localhost:27017]] 从 NodeJS 到 mongodb
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[Error: failed to connect to [localhost:27017]] from NodeJS to mongodb
提问by user2812866
I am having problem connecting to MongoDB from NodeJS using following sample code. I tried running "mongod" with or without sudo but nodejs code still fail to connect. I am able to successfully connect to database using "mongo".
我在使用以下示例代码从 NodeJS 连接到 MongoDB 时遇到问题。我尝试在有或没有 sudo 的情况下运行“mongod”，但 nodejs 代码仍然无法连接。我能够使用“mongo”成功连接到数据库。
Running on : MAC OS 10.6.8
运行于：MAC OS 10.6.8
var mongoClient = require('mongodb').MongoClient;
mongoClient.connect("mongodb://localhost:27017/test", function(error, db) {
if(!error){
console.log("We are connected");
}
else
console.dir(error);
});
get following error running above code : [Error: failed to connect to [localhost:27017]]
运行上面的代码时出现以下错误：[错误：无法连接到 [localhost:27017]]
Also tried mongoose but similar error:
也试过猫鼬但类似的错误：
var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/test');
var db = mongoose.connection;
db.on('error', console.error.bind(console, 'connection error:'));
db.once('open', function callback () {
console.log("DB connected");
// yay!
});
Output: connection error: [Error: failed to connect to [localhost:27017]]
输出：连接错误：[错误：无法连接到 [localhost:27017]]
Here is the log of mongod
这是mongod的日志
mongod --help for help and startup options
2014-07-11T23:33:47.843-0700 kern.sched unavailable
2014-07-11T23:33:47.849-0700 [initandlisten] MongoDB starting : pid=29942 port=27017 dbpath=/data/db 64-bit host=usc8bcc8a0d0b1
2014-07-11T23:33:47.849-0700 [initandlisten]
2014-07-11T23:33:47.849-0700 [initandlisten] ** WARNING: soft rlimits too low. Number of files is 256, should be at least 1000
2014-07-11T23:33:47.849-0700 [initandlisten] db version v2.6.3
2014-07-11T23:33:47.849-0700 [initandlisten] git version: nogitversion
2014-07-11T23:33:47.849-0700 [initandlisten] build info: Darwin usc8bcc8a0d0b1 10.8.0 Darwin Kernel Version 10.8.0: Tue Jun 7 16:33:36 PDT 2011; root:xnu-1504.15.3~1/RELEASE_I386 i386 BOOST_LIB_VERSION=1_49
2014-07-11T23:33:47.849-0700 [initandlisten] allocator: system
2014-07-11T23:33:47.849-0700 [initandlisten] options: {}
2014-07-11T23:33:47.850-0700 [initandlisten] journal dir=/data/db/journal
2014-07-11T23:33:47.850-0700 [initandlisten] recover : no journal files present, no recovery needed
2014-07-11T23:33:47.901-0700 [initandlisten] waiting for connections on port 27017
2014-07-11T23:34:47.901-0700 [clientcursormon] mem (MB) res:48 virt:2810
2014-07-11T23:34:47.901-0700 [clientcursormon] mapped (incl journal view):320
2014-07-11T23:34:47.901-0700 [clientcursormon] connections:0
回答by user2812866
Never mind, I was able to resolve the issue by using 127.0.0.1 instead of localhost, not sure why I have to use ip address. My tomcat, apache, redis, and even node server all works using localhost but not the mongodb. Is there is config I need change to make it work using local host?
没关系，我可以通过使用 127.0.0.1 而不是 localhost 来解决这个问题，不知道为什么我必须使用 ip 地址。我的 tomcat、apache、redis 甚至节点服务器都可以使用 localhost 而不是 mongodb。是否有我需要更改的配置才能使用本地主机工作？
回答by Nicolás Sefercheoglou
Try adding 127.0.0.1 localhostin /private/etc/hostsfile.
尝试添加127.0.0.1 localhost的/private/etc/hosts文件。
回答by Chhavi Gangwal
- This issue can occur if your mongoDBwasnot shutdown properly Mongodb can't connect to localhost but can connect to localhost's IP address
- Start your mongoDB Server using follwoingcommand and then try same
./mongod --bind_ip localhost
- 如果您的 mongoDB未正确关闭，则会出现此问题 Mongodb 无法连接到 localhost 但可以连接到 localhost 的 IP 地址
- 使用以下命令启动您的 mongoDB 服务器，然后尝试相同的
./mongod --bind_ip localhost
回答by yuanfang wang
yes , I came across this error too, and my hosts is as follow:
127.0.0.1 xxxxxx(the ip of my computer)
and when I ran npm startin express project, it got an error like that . After I tried to change the mapping of 127.0.0.1to localhost, it had no error.
是的，我也遇到了这个错误，我的主机如下：
127.0.0.1 xxxxxx(the ip of my computer)
当我npm start在 express 项目中运行时，它得到了这样的错误。之后，我试图改变的映射127.0.0.1到localhost，它有没有错误。
回答by Mr Washington
Somebody on Github found a solution: Instead of writing:
Github 上有人找到了解决方案：而不是写：
Mongoose.connect(config.database.url);
Write:
写：
Mongoose.connect(config.database.url, {
keepAlive: true,
reconnectTries: Number.MAX_VALUE,
useMongoClient: true
});
回答by The Red Pea
The first time, I made the obvious mistake that mongod(the mongo Server) was not even running.
第一次，我犯了一个明显的错误，即mongod（mongo 服务器）甚至没有运行。
The second time, I had both the Server (mongod) and the Client (mongo) running on my Windows; in separate Command Prompts (of course mongorunning first). mongodand/or its Command Prompt was "hung up" (i.e. the last line only said this, and the last line remained like this despite attempts to connections:)
第二次，我的 Windows 上同时运行了服务器 ( mongod) 和客户端 ( mongo)；在单独的命令提示符中（当然mongo首先运行）。mongod和/或其命令提示符被“挂断”（即最后一行只说了这一点，尽管尝试连接，最后一行仍然如此：）
2017-06-20T12:31:02.937-0600 I NETWORK [thread1] waiting for connections on port 27017
I clicked in the Command Prompt pressed the space-bar to "kick it" , and the Command Prompt printed lines like these:
我在命令提示符中单击并按空格键“踢它”，命令提示符打印如下所示的行：
2017-06-20T12:31:48.517-0600 I NETWORK [thread1] connection accepted from 127.0.0.1:50260 #1 (1 connection now open)
Which worked!
哪个有效！
