Question

I installed MongoDB with the official packages (mongodb-stable), and followed the Quickstart guide which includes:

By default MongoDB will store data in
/data/db, but it won’t automatically
create that directory. To create it,
do:

$ sudo mkdir -p /data/db/
$ sudo chown `id -u` /data/db

You can also tell MongoDB to use a
different data directory, with the
--dbpath option.

MongoDB will only start if I run sudo mongod – if I try and run just mongod I get the error:

Mon Mar 14 15:27:07 [initandlisten] couldn't open /data/db/test.ns errno:13 Permission denied
Mon Mar 14 15:27:07 [initandlisten]   couldn't open file /data/db/test.ns terminating
Mon Mar 14 15:27:07 dbexit:

What gives?

Answer 1

You created /data/db as root so it has those permissions. You can change the permissions to your user account, or whatever you have mongo running as.

chown -R username /data/db

or /data

You can also set a group

chown -R username.groupname

The -R does it recursively, so it will affect all the files you’ve created running mongoDB as root already.