mongodb mongod shell 不启动，data/db 不存在
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mongod shell doesn't start, data/db doesn't exsist
提问by Ruben Yeghikyan
When I start mongod trowed error. What is the problem?
当我开始 mongod 时出现错误。问题是什么？
root@cs12867:~# mongod
mongod --help for help and startup options
Sun Dec 22 15:37:44.081 [initandlisten] MongoDB starting : pid=18415 port=27017 dbpath=/data/db/ 64-bit host=cs12867
Sun Dec 22 15:37:44.081 [initandlisten] db version v2.4.6
Sun Dec 22 15:37:44.081 [initandlisten] git version: b9925db5eac369d77a3a5f5d98a145eaaacd9673
Sun Dec 22 15:37:44.081 [initandlisten] build info: Linux ip-10-2-29-40 2.6.21.7-2.ec2.v1.2.fc8xen #1 SMP Fri Nov 20 17:48:28 EST 2009 x86_64 BOOST_LIB_VERSION=1_49
Sun Dec 22 15:37:44.081 [initandlisten] allocator: tcmalloc
Sun Dec 22 15:37:44.081 [initandlisten] options: {}
Sun Dec 22 15:37:44.081 [initandlisten] exception in initAndListen: 10296
*********************************************************************
ERROR: dbpath (/data/db/) does not exist.
Create this directory or give existing directory in --dbpath.
See http://dochub.mongodb.org/core/startingandstoppingmongo
*********************************************************************
, terminating
Sun Dec 22 15:37:44.081 dbexit:
Sun Dec 22 15:37:44.081 [initandlisten] shutdown: going to close listening sockets...
Sun Dec 22 15:37:44.081 [initandlisten] shutdown: going to flush diaglog...
Sun Dec 22 15:37:44.081 [initandlisten] shutdown: going to close sockets...
Sun Dec 22 15:37:44.081 [initandlisten] shutdown: waiting for fs preallocator...
Sun Dec 22 15:37:44.081 [initandlisten] shutdown: lock for final commit...
Sun Dec 22 15:37:44.081 [initandlisten] shutdown: final commit...
Sun Dec 22 15:37:44.081 [initandlisten] shutdown: closing all files...
Sun Dec 22 15:37:44.081 [initandlisten] closeAllFiles() finished
Sun Dec 22 15:37:44.081 dbexit: really exiting now
I set --dbpath:
我设置--dbpath：
root@cs12867:~# mongod --dbpath /var/lib/mongodb/data/db
Sun Dec 22 15:29:25.121 [initandlisten] MongoDB starting : pid=17739 port=27017 dbpath=/var/lib/mongodb/data/db 64-bit host=cs12867
Sun Dec 22 15:29:25.121 [initandlisten] db version v2.4.6
Sun Dec 22 15:29:25.121 [initandlisten] git version: b9925db5eac369d77a3a5f5d98a145eaaacd9673
Sun Dec 22 15:29:25.121 [initandlisten] build info: Linux ip-10-2-29-40 2.6.21.7-2.ec2.v1.2.fc8xen #1 SMP Fri Nov 20 17:48:28 EST 2009 x86_64 BOOST_LIB_VERSION=1_49
Sun Dec 22 15:29:25.121 [initandlisten] allocator: tcmalloc
Sun Dec 22 15:29:25.121 [initandlisten] options: { dbpath: "/var/lib/mongodb/data/db" }
Sun Dec 22 15:29:25.121 [initandlisten]
Sun Dec 22 15:29:25.121 [initandlisten] ** WARNING: Readahead for /var/lib/mongodb/data/db is set to 2048KB
Sun Dec 22 15:29:25.121 [initandlisten] ** We suggest setting it to 256KB (512 sectors) or less
Sun Dec 22 15:29:25.121 [initandlisten] ** http://dochub.mongodb.org/core/readahead
Sun Dec 22 15:29:25.123 [initandlisten] journal dir=/var/lib/mongodb/data/db/journal
Sun Dec 22 15:29:25.123 [initandlisten] recover : no journal files present, no recovery needed
Sun Dec 22 15:29:25.134 [initandlisten] waiting for connections on port 27017
Sun Dec 22 15:29:25.134 [websvr] admin web console waiting for connections on port 28017
Sun Dec 22 15:29:26.179 [initandlisten] connection accepted from 127.0.0.1:37164 #1 (1 connection now open)
Sun Dec 22 15:29:26.179 [FileAllocator] allocating new datafile /var/lib/mongodb/data/db/Tester.ns, filling with zeroes...
Sun Dec 22 15:29:26.179 [FileAllocator] creating directory /var/lib/mongodb/data/db/_tmp
Sun Dec 22 15:29:26.181 [FileAllocator] done allocating datafile /var/lib/mongodb/data/db/Tester.ns, size: 16MB, took 0 secs
Sun Dec 22 15:29:26.181 [FileAllocator] allocating new datafile /var/lib/mongodb/data/db/Tester.0, filling with zeroes...
Sun Dec 22 15:29:26.181 [FileAllocator] done allocating datafile /var/lib/mongodb/data/db/Tester.0, size: 64MB, took 0 secs
Sun Dec 22 15:29:26.182 [FileAllocator] allocating new datafile /var/lib/mongodb/data/db/Tester.1, filling with zeroes...
Sun Dec 22 15:29:26.182 [FileAllocator] done allocating datafile /var/lib/mongodb/data/db/Tester.1, size: 128MB, took 0 secs
Sun Dec 22 15:29:26.184 [conn1] build index Tester.user { _id: 1 }
Sun Dec 22 15:29:26.184 [conn1] build index done. scanned 0 total records. 0 secs
Sun Dec 22 15:29:26.184 [conn1] end connection 127.0.0.1:37164 (0 connections now open)
Sun Dec 22 15:29:26.192 [initandlisten] connection accepted from 127.0.0.1:37165 #2 (1 connection now open)
Sun Dec 22 15:29:26.732 [initandlisten] connection accepted from 127.0.0.1:37166 #3 (2 connections now open)
Sun Dec 22 15:29:26.733 [conn3] end connection 127.0.0.1:37166 (1 connection now open)
Sun Dec 22 15:29:26.740 [initandlisten] connection accepted from 127.0.0.1:37167 #4 (2 connections now open)
Sun Dec 22 15:29:26.740 [conn4] end connection 127.0.0.1:37167 (1 connection now open)
Sun Dec 22 15:29:26.834 [initandlisten] connection accepted from 127.0.0.1:37168 #5 (2 connections now open)
Sun Dec 22 15:29:26.835 [conn5] end connection 127.0.0.1:37168 (1 connection now open)
Sun Dec 22 15:29:26.843 [initandlisten] connection accepted from 127.0.0.1:37169 #6 (2 connections now open)
Sun Dec 22 15:29:27.252 [initandlisten] connection accepted from 127.0.0.1:37170 #7 (3 connections now open)
Sun Dec 22 15:29:27.253 [conn7] end connection 127.0.0.1:37170 (2 connections now open)
Sun Dec 22 15:29:27.304 [initandlisten] connection accepted from 127.0.0.1:37171 #8 (3 connections now open)
Sun Dec 22 15:29:27.304 [conn8] end connection 127.0.0.1:37171 (2 connections now open)
Sun Dec 22 15:29:28.332 [initandlisten] connection accepted from 127.0.0.1:37173 #9 (3 connections now open)
Sun Dec 22 15:29:28.333 [conn9] end connection 127.0.0.1:37173 (2 connections now open)
Sun Dec 22 15:29:28.352 [initandlisten] connection accepted from 127.0.0.1:37174 #10 (3 connections now open)
Sun Dec 22 15:29:28.842 [conn10] end connection 127.0.0.1:37174 (2 connections now open)
Sun Dec 22 15:29:28.862 [initandlisten] connection accepted from 127.0.0.1:37176 #11 (3 connections now open)
Sun Dec 22 15:29:28.863 [conn11] end connection 127.0.0.1:37176 (2 connections now open)
Sun Dec 22 15:29:30.362 [initandlisten] connection accepted from 127.0.0.1:37178 #12 (3 connections now open)
Sun Dec 22 15:29:30.363 [initandlisten] connection accepted from 127.0.0.1:37179 #13 (4 connections now open)
Sun Dec 22 15:29:30.364 [conn13] end connection 127.0.0.1:37179 (3 connections now open)
Sun Dec 22 15:37:36.523 [signalProcessingThread] shutdown: closing all files...
Sun Dec 22 15:37:36.523 [signalProcessingThread] closeAllFiles() finished
Sun Dec 22 15:37:36.523 [signalProcessingThread] journalCleanup...
Sun Dec 22 15:37:36.523 [signalProcessingThread] removeJournalFiles
Sun Dec 22 15:37:36.525 [signalProcessingThread] shutdown: removing fs lock...
Sun Dec 22 15:37:36.525 dbexit: really exiting now
Then again:
然后再说一遍：
root@cs12867:~# mongod
mongod --help for help and startup options
Sun Dec 22 15:37:44.081 [initandlisten] MongoDB starting : pid=18415 port=27017 dbpath=/data/db/ 64-bit host=cs12867
Sun Dec 22 15:37:44.081 [initandlisten] db version v2.4.6
Sun Dec 22 15:37:44.081 [initandlisten] git version: b9925db5eac369d77a3a5f5d98a145eaaacd9673
Sun Dec 22 15:37:44.081 [initandlisten] build info: Linux ip-10-2-29-40 2.6.21.7-2.ec2.v1.2.fc8xen #1 SMP Fri Nov 20 17:48:28 EST 2009 x86_64 BOOST_LIB_VERSION=1_49
Sun Dec 22 15:37:44.081 [initandlisten] allocator: tcmalloc
Sun Dec 22 15:37:44.081 [initandlisten] options: {}
Sun Dec 22 15:37:44.081 [initandlisten] exception in initAndListen: 10296
*********************************************************************
ERROR: dbpath (/data/db/) does not exist.
Create this directory or give existing directory in --dbpath.
See http://dochub.mongodb.org/core/startingandstoppingmongo
*********************************************************************
, terminating
Sun Dec 22 15:37:44.081 dbexit:
Sun Dec 22 15:37:44.081 [initandlisten] shutdown: going to close listening sockets...
Sun Dec 22 15:37:44.081 [initandlisten] shutdown: going to flush diaglog...
Sun Dec 22 15:37:44.081 [initandlisten] shutdown: going to close sockets...
Sun Dec 22 15:37:44.081 [initandlisten] shutdown: waiting for fs preallocator...
Sun Dec 22 15:37:44.081 [initandlisten] shutdown: lock for final commit...
Sun Dec 22 15:37:44.081 [initandlisten] shutdown: final commit...
Sun Dec 22 15:37:44.081 [initandlisten] shutdown: closing all files...
Sun Dec 22 15:37:44.081 [initandlisten] closeAllFiles() finished
Sun Dec 22 15:37:44.081 dbexit: really exiting now
回答by 4J41
The default db path for mongodb is /data/db/.
mongodb 的默认数据库路径是/data/db/.
So when you run:
所以当你运行时：
mongod
MongoDB checks if /data/db/ is present and if the user has access to it. In your case, there is no such directory and hence the error.
MongoDB 检查 /data/db/ 是否存在以及用户是否有权访问它。在您的情况下，没有这样的目录，因此出现错误。
However you can override the default db path using the --dbpath argument of mongod( or use a config file).
但是，您可以使用 mongod 的 --dbpath 参数（或使用配置文件）覆盖默认数据库路径。
mongod --dbpath /var/lib/mongodb/data/db
In this case instead of checking for /data/db/ mongoDB check for /var/lib/mongodb/data/db. In your case, you have the specified directory and you have access to it and hence it runs.
在这种情况下，不是检查 /data/db/ mongoDB 检查 /var/lib/mongodb/data/db。在您的情况下，您拥有指定的目录并且可以访问它，因此它可以运行。
And doing this doesn't start the mongo shell. To start the shell, start mongod first as mentioned above and leave it running. Then in another terminal execute
这样做并不会启动 mongo shell。要启动 shell，首先如上所述启动 mongod 并让它继续运行。然后在另一个终端执行
mongo
This will start the mongo shell.
这将启动 mongo shell。
回答by Jayram
As I see from the problem that creating the data/db directory will fix your problem.
正如我从问题中看到的，创建 data/db 目录将解决您的问题。
Create that and then add like this if you have directory path in c drive.
如果您在 c 驱动器中有目录路径，则创建它然后像这样添加。
mongod --dbpath "c://data/db"
mongod --dbpath "c://data/db"
After setting the dbpath you should start the mongodb as service.
设置 dbpath 后，您应该将 mongodb 作为服务启动。
sudo service mongodb start
回答by Voy
Another solution to that problem could be:
该问题的另一个解决方案可能是：
.
.
Delete the files inside of /data/journal/or /data/db/journal/
删除/data/journal/或/data/db/journal/ 中的文件
.
.
Especially if your database stopped working after an unclean restart / crash. It seems that the journal files can get corrupted and block the mongo service from starting. Remember to backup the files first just in case.
特别是如果您的数据库在不干净的重启/崩溃后停止工作。似乎日志文件可能会损坏并阻止 mongo 服务启动。记得先备份文件以防万一。
Following these posts:
按照这些帖子：
https://stackoverflow.com/a/16323101
https://stackoverflow.com/a/16323101
