我正在使用Django框架。我的客户端是js，后端使用mongodb。两天前，我停止并重新启动了Apache2服务器，网站正常运行。今天突然出现了500内部服务器错误。当我检查error.log文件时，它显示：
[.....] ConnectionError: Cannot connect to the database:
[.....] could not connect to localhost:27017: [Errno 111] Connection refused
所以，我尝试用以下方式通过python测试与mongodb的连接：
>>> from pymongo import Connection
>>> connection = Connection('localhost',27017)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python2.6/dist-packages/pymongo/connection.py", line 381, in __init__
self.__find_node()
File "/usr/local/lib/python2.6/dist-packages/pymongo/connection.py", line 659, in __find_node
raise AutoReconnect(', '.join(errors))
pymongo.errors.AutoReconnect: could not connect to localhost:27017: [Errno 111] Connection refused
我使用
$mongo测试连接，显示如下：MongoDB shell version: 2.4.9
connecting to: test
Mon Jan 20 15:22:53.729 Error: couldn't connect to server 127.0.0.1:27017 at src/mongo/shell/mongo.js:145
exception: connect failed
我试图寻找解决这个问题的答案，发现有人建议删除
mongod.lock文件并重新启动mongodb，例如在Pymongo keeps refusing the connection at 27017和MongoDB won't start after server crash等网站中。但是在http://docs.mongodb.org/manual/tutorial/recover-data-following-unexpected-shutdown/中写道：在正常操作中，您不应删除mongod.lock文件并启动mongod。相反，请考虑上述方法之一来恢复数据库并删除锁定文件。在紧急情况下，您可以删除锁定文件，并使用可能已损坏的文件启动数据库，并尝试从数据库中恢复数据；但是，在这些情况下无法预测数据库的状态。我真的很困惑该怎么做？我应该删除mongod.lock文件吗？而且，我需要先启动mongodb服务器，然后再启动apache2服务器吗？Mongodb日志文件显示： tail -n -30 mongodb.log
***** SERVER RESTARTED *****
Mon Jan 20 15:10:19.740 [initandlisten] MongoDB starting : pid=8061 port=27017 dbpath=/var/lib/mongodb 64-bit host=hand
Mon Jan 20 15:10:19.740 [initandlisten] db version v2.4.9
Mon Jan 20 15:10:19.740 [initandlisten] git version: xxxxx //gives the number
Mon Jan 20 15:10:19.740 [initandlisten] build info: xxxx
Mon Jan 20 15:10:19.740 [initandlisten] allocator: tcmalloc
Mon Jan 20 15:10:19.740 [initandlisten] options: { config: "/etc/mongodb.conf", dbpath: "/var/lib/mongodb", logappend: "true", logpath: "/var/log/mongodb/mongodb.log" }
Mon Jan 20 15:10:19.742 [initandlisten] journal dir=/var/lib/mongodb/journal
Mon Jan 20 15:10:19.742 [initandlisten] recover : no journal files present, no recovery needed
Mon Jan 20 15:10:19.742 [initandlisten]
Mon Jan 20 15:10:19.742 [initandlisten] ERROR: Insufficient free space for journal files
Mon Jan 20 15:10:19.742 [initandlisten] Please make at least 3379MB available in /var/lib/mongodb/journal or use --smallfiles
Mon Jan 20 15:10:19.742 [initandlisten]
Mon Jan 20 15:10:19.743 [initandlisten] exception in initAndListen: 15926 Insufficient free space for journals, terminating
Mon Jan 20 15:10:19.743 dbexit:
Mon Jan 20 15:10:19.743 [initandlisten] shutdown: going to close listening sockets...
Mon Jan 20 15:10:19.743 [initandlisten] shutdown: going to flush diaglog...
Mon Jan 20 15:10:19.743 [initandlisten] shutdown: going to close sockets...
Mon Jan 20 15:10:19.743 [initandlisten] shutdown: waiting for fs preallocator...
Mon Jan 20 15:10:19.743 [initandlisten] shutdown: lock for final commit...
Mon Jan 20 15:10:19.743 [initandlisten] shutdown: final commit...
Mon Jan 20 15:10:19.743 [initandlisten] shutdown: closing all files...
Mon Jan 20 15:10:19.743 [initandlisten] closeAllFiles() finished
Mon Jan 20 15:10:19.743 [initandlisten] journalCleanup...
Mon Jan 20 15:10:19.743 [initandlisten] removeJournalFiles
Mon Jan 20 15:10:19.743 [initandlisten] shutdown: removing fs lock...
Mon Jan 20 15:10:19.743 dbexit: really exiting now
如果我运行以下命令，它会显示：
$ sudo service mongodb start
Starting database: mongodb failed!