Journal files are present in journal directory, yet starting without journaling enabled

Question

I have started learning MongoDB and for which trying to install it on Ubuntu (which I recently shifted from windows). Facing issues to start it with sudo service mongodb start . Following are the logs:

Sun Aug  4 20:25:36.774 [initandlisten] options: { config: "/etc/mongodb.conf", dbpath: "/var/lib/mongodb", logappend: "true", logpath: "/var/log/mongodb/mongodb.log" }
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Error: journal files are present in journal directory, yet starting without journaling enabled.
It is recommended that you start with journaling enabled so that recovery may occur.
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Sun Aug  4 20:25:36.774 [initandlisten] exception in initAndListen: 13597 can't start without --journal enabled when journal/ files are present, terminating
Sun Aug  4 20:25:36.774 dbexit: 
Sun Aug  4 20:25:36.774 [initandlisten] shutdown: going to close listening sockets...

Answer 1

删除日志文件： /var/lib/mongodb/journal下的所有内容（如果要禁用日志记录（不建议）或使用日志记录：在配置文件中为journal=true或从命令行使用--journal 。

Answer 2

If MongoDB has been shutdown forcefully then the journal files are not cleaned up. The warning is here so that you can decide whether you want to recover from a failure (recommended). For recovery to work, you need to start MongoDB with --journal . Journalling is turned on by default though so I expect your /etc.mongodb.conf file has a nojournal=true line. You can remove that one instead as well.

If you really don't care about recovering, then you can simply remove all the files under /var/lib/mongodb/journal —but realise that you might end up with broken data files.