为什么mongodb异常关闭后，再启动需要删除mongd.lock文件

mongod.lock文件是mongo服务端启动后在硬盘中创建的一个锁文件，

如果你正常退出mongod服务，该文件即使还存在，也不会影响下一次启动mongod服务的。

 

这个文件还会记录mongod在运行过程中的一些状态，以便在正常重新启动服务时能够获取异常信息提示。

非正常关闭了mongoDB，重启错误信息如下：

 

01Tue Apr 17 11:13:30

02Tue Apr 17 11:13:30 warning: 32-bit servers don't have journaling enabled by default. Please use --journalifyou want durability.

03Tue Apr 17 11:13:30

04Tue Apr 17 11:13:30 [initandlisten] MongoDB starting : pid=7128 port=27017 dbpath=D:\Programs\mongodb204\db 32-bit host=FALCON

05Tue Apr 17 11:13:30 [initandlisten]

06Tue Apr 17 11:13:30 [initandlisten] ** NOTE: when using MongoDB 32 bit, you are limited to about 2 gigabytes of data

07Tue Apr 17 11:13:30 [initandlisten] **       see http://blog.mongodb.org/post/137788967/32-bit-limitations

08Tue Apr 17 11:13:30 [initandlisten] **       with --journal, the limit is lower

09Tue Apr 17 11:13:30 [initandlisten]

10Tue Apr 17 11:13:30 [initandlisten] db version v2.0.4, pdfile version 4.5

11Tue Apr 17 11:13:30 [initandlisten] git version: 329f3c47fe8136c03392c8f0e548506cb21f8ebf

12Tue Apr 17 11:13:30 [initandlisten] build info: windows sys.getwindowsversion(major=6, minor=0, build=6002, platform=2, service_pack='Service Pack 2')BOOST_LIB_VERSION=1_42

13Tue Apr 17 11:13:30 [initandlisten] options: { dbpath:"D:\Programs\mongodb204\db"}

14**************

15Unclean shutdowndetected.

16Please visit http://dochub.mongodb.org/core/repairforrecovery instructions.

17*************

18Tue Apr 17 11:13:30 [initandlisten] exceptionininitAndListen: 12596 old lockfile, terminating

19Tue Apr 17 11:13:30 dbexit:

20Tue Apr 17 11:13:30 [initandlisten] shutdown: going to close listening sockets...

21Tue Apr 17 11:13:30 [initandlisten] shutdown: going to flush diaglog...

22Tue Apr 17 11:13:30 [initandlisten] shutdown: going to close sockets...

23Tue Apr 17 11:13:30 [initandlisten] shutdown: waiting for fs preallocator...

24Tue Apr 17 11:13:30 [initandlisten] shutdown: closing all files...

25Tue Apr 17 11:13:30 [initandlisten] closeAllFiles() finished

26Tue Apr 17 11:13:30 dbexit: really exiting now

解决方法：

1、删除%MONGO_HOME%/db下的.lock文件

2、输入命令 mongod --repair

3、重启mongoDB