Meteor: unexpected mongo exit code 100

Question

I have just installed Meteor version 0.5.9 (45fef52095) to my CentOS release 6.3 (Final) server (Linux version 2.6.32-279.19.1.el6.i686 ([e-mail]) (gcc version 4.4.6 20120305 (Red Hat 4.4.6-4) (GCC) ) #1 SMP Wed Dec 19 04:30:58 UTC 2012)

I have a samba share to a Windows SBS server mounted as /mnt/apshared under the apache user. I have created a directory inside this called 'webmeteor'. I have created an app called 'myapp' inside the 'webmeteor' directory, so my directory is like so: /mnt/apshared/webmeteor/myapp.

I am logged in as root. When I try to run the app using the meteor command, I am given the following error messages:

Unexpected mongo exit code 100. Restarting.
Unexpected mongo exit code 100. Restarting.
Unexpected mongo exit code 100. Restarting.
Can't start mongod

MongoDB had an unspecified uncaught exception.
Check to make sure that MongoDB is able to write to its database directory.

My first point of call was this StackOverflow question: Creating a new meteor.js file and get error 100, MongoDB not able to write -- however, following these suggestions (sudo'ing the meteor command, and checking for disk space of which I have 70GB free) has not worked. I am quite certain that these issues are permission related.

I have tried to chown recursively to root:root (as I am logged in as root), and chmod to 777 recursively also, but to no avail.

I am asking you, what should I try next, to allow my Meteor app to start?

Thanks in advance.

Answer 1

If you have installed Mongo globally, then be sure to delete all the prealloc files in the /db/journal folder.

For Ubuntu, the /db/ folder is normally located in /data so the full path is /data/db/journal. This might be different for other OS's.

Answer 2

I had this problem using Meteor 1.4 on Windows 10. However, I am developing the the same meteor application on an Ubuntu install. The problem for me was caused by differences in the way Mongo 3.2 is implemented on Windows and Ubuntu. My 64 bit Ubuntu install uses WiredTiger. However as it says in the Meteor documentation:

If you are using Windows or 32bit Linux, you can update your development
database to 3.2, however it will continue to use the MMAPv1 storage 
engine, as the 32bit MongoDB binary does not support WiredTiger.

Using meteor reset on Windows blew away the WiredTiger format database from Ubuntu, and then rebuilt it using the old MMAPV1 engine. This solved the exit code 100 error.