我来自riak和redis，在那里我从未有过这个服务启动或互动的问题。
这是蒙古人普遍存在的问题，我对此一无所知。重启也无济于事。我是蒙哥的新手。
mongo
MongoDB shell version: 2.2.1
connecting to: test
Fri Nov 9 16:44:06 Error: couldn't connect to server 127.0.0.1:27017 src/mongo/shell/mongo.js:91
exception: connect failed
这是我在日志里看到的。
now open)
Fri Nov 9 16:44:34 [conn47] end connection 10.29.16.208:5306 (1 connection now open)
Fri Nov 9 16:45:04 [initandlisten] connection accepted from 10.29.16.208:5307 #48 (2 connections now open)
Fri Nov 9 16:45:04 [conn48] end connection 10.29.16.208:5307 (1 connection now open)
Fri Nov 9 16:45:04 [initandlisten] connection accepted from 10.29.16.208:5308 #49 (2 connections now open)
Fri Nov 9 16:45:04 [conn49] end connection 10.29.16.208:5308 (1 connection now open)
Fri Nov 9 16:45:34 [initandlisten] connection accepted from 10.29.16.208:5316 #50 (2 connections now open)
Fri Nov 9 16:45:34 [conn50] end connection 10.29.16.208:5316 (1 connection now open)
Fri Nov 9 16:45:34 [initandlisten] connection accepted from 10.29.16.208:5317 #51 (2 connections now open)
Fri Nov 9 16:45:34 [conn51] end connection 10.29.16.208:5317 (1 connection now open)
Fri Nov 9 16:46:04 [initandlisten] connection accepted from 10.29.16.208:5320 #52 (2 connections now open)
Fri Nov 9 16:46:04 [conn52] end connection 10.29.16.208:5320 (1 connection now open)
Fri Nov 9 16:46:04 [initandlisten] connection accepted from 10.29.16.208:5321 #53 (2 connections now open)
Fri Nov 9 16:46:04 [conn53] end connection 10.29.16.208:5321 (1 conn
要连接mongo，我们必须首先启动“mongod”服务。
您可以看到以下输出:
$ mongod
2017-03-05T00:31:39.055+0530 I CONTROL [initandlisten] MongoDB starting : pid=1481 port=27017 dbpath=/data/db 64-bit host=Prabhu-Nandans-Mac.local
2017-03-05T00:31:39.056+0530 I CONTROL [initandlisten] db version v3.4.2
2017-03-05T00:31:39.056+0530 I CONTROL [initandlisten] git version: 3f76e40c105fc223b3e5aac3e20dcd026b83b38b
2017-03-05T00:31:39.056+0530 I CONTROL [initandlisten] OpenSSL version: OpenSSL 1.0.2k 26 Jan 2017
2017-03-05T00:31:39.056+0530 I CONTROL [initandlisten] allocator: system
2017-03-05T00:31:39.056+0530 I CONTROL [initandlisten] modules: none
2017-03-05T00:31:39.056+0530 I CONTROL [initandlisten] build environment:
2017-03-05T00:31:39.056+0530 I CONTROL [initandlisten] distarch: x86_64
2017-03-05T00:31:39.056+0530 I CONTROL [initandlisten] target_arch: x86_64
2017-03-05T00:31:39.056+0530 I CONTROL [initandlisten] options: {}
2017-03-05T00:31:39.056+0530 W - [initandlisten] Detected unclean shutdown - /data/db/mongod.lock is not empty.
2017-03-05T00:31:39.057+0530 I - [initandlisten] Detected data files in /data/db created by the 'wiredTiger' storage engine, so setting the active storage engine to 'wiredTiger'.
2017-03-05T00:31:39.057+0530 W STORAGE [initandlisten] Recovering data from the last clean checkpoint.
2017-03-05T00:31:39.057+0530 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),
2017-03-05T00:31:39.620+0530 I CONTROL [initandlisten]
2017-03-05T00:31:39.620+0530 I CONTROL [initandlisten] ** WARNING: Access control is not enabled for the database.
2017-03-05T00:31:39.620+0530 I CONTROL [initandlisten] ** Read and write access to data and configuration is unrestricted.
2017-03-05T00:31:39.620+0530 I CONTROL [initandlisten]
2017-03-05T00:31:39.620+0530 I CONTROL [initandlisten]
2017-03-05T00:31:39.620+0530 I CONTROL [initandlisten] ** WARNING: soft rlimits too low. Number of files is 256, should be at least 1000
2017-03-05T00:31:39.643+0530 I FTDC [initandlisten] Initializing full-time diagnostic data capture with directory '/data/db/diagnostic.data'
2017-03-05T00:31:39.643+0530 I NETWORK [thread1] waiting for connections on port 27017
2017-03-05T00:31:40.008+0530 I FTDC [ftdc] Unclean full-time diagnostic data capture shutdown detected, found interim file, some metrics may have been lost. OK
2017-03-05T00:32:03.832+0530 I NETWORK [thread1] connection accepted from 127.0.0.1:49806 #1 (1 connection now open)
2017-03-05T00:32:03.833+0530 I NETWORK [conn1] received client metadata from 127.0.0.1:49806 conn1: { application: { name: "MongoDB Shell" }, driver: { name: "MongoDB Internal Client", version: "3.4.2" }, os: { type: "Darwin", name: "Mac OS X", architecture: "x86_64", version: "16.4.0" } }
2017-03-05T00:32:08.376+0530 I - [conn1] end connection 127.0.0.1:49806 (1 connection now open)
然后打开另一个终端，输入“mongo”。
输出如下:
$ mongo
MongoDB shell version v3.4.2
connecting to: mongodb://127.0.0.1:27017
MongoDB server version: 3.4.2
你的问题解决了:)
我是一个windows用户，我在2018年11月安装了MongoDB，我不想设置数据/db目录。但是过了几天，当我打开的时候，收到了一条错误信息:
MongoDB shell version v4.0.4
connecting to: mongodb://127.0.0.1:27017
2018-12-05T20:42:40.108+0530 E QUERY [js] Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed: SocketException: Error connecting to 127.0.0.1:27017 :: caused by :: No connection could be made because the target machine actively refused it. :
connect@src/mongo/shell/mongo.js:257:13
@(connect):1:6
exception: connect failed
然后我试图修复使用所有上述答案，没有工作。当我试着运行mongod时，它说
MongoDB starting : pid=12220 port=27017 dbpath=C:\data\db\ 64-bit host=bla
我试图通过文件系统和cmd改变db路径(到程序文件)，但这些都不起作用。
对我有效的解决方法是:
打开任务管理器(ctrl + shift + esc) -> Services选项卡，有一个状态为stopped的MongoDB行。然后我右键单击开始，一切都工作得很完美:)。
