MongoDB service not running in Fedora - linux

Question

Just installed a clean version of mongodb on Fedora 17 64-bit, but the Mongo service wont run.
I followed these instructions during installation
Running
service mongod start
results in
Starting mongod (via systemctl): Job failed. See system journal and 'systemctl status' for details. [FAILED]
So I ran
systemctl status mongod.service
which gives me
mongod.service - SYSV: Mongo is a scalable, document-oriented database.
Loaded: loaded (/etc/rc.d/init.d/mongod)
Active: failed (Result: exit-code) since Mon, 18 Jun 2012 13:15:56 +0200; 58s ago
Process: 13584 ExecStart=/etc/rc.d/init.d/mongod start (code=exited, status=1/FAILURE)
CGroup: name=systemd:/system/mongod.service
Mongo logs in /var/log/mongo/mongod.log is empty
Thanks

Answer 1

How to install mongodb and mongodb-server on fedora linux (verified on f16 & f17). All commands are intended to be run in a su session.
1) make sure you have no mongodb installation lying around
# yum erase mongodb
# yum erase mongo-10gen (if it is installed)
2) install from fedora yum repository
# yum --disablerepo=* --enablerepo=fedora,updates install mongodb mongodb-server
3) start mongod (mongodb daemon)
# systemctl start mongod.service
4) verify mongod is running
# systemctl status mongod.service
# tail /var/log/mongodb/mongodb.log
# nmap -p27017 localhost
or running client
# mongo
MongoDB shell version: 2.0.2
connecting to: test
> db.test.save( { a: 1 } )
> db.test.find()
{ "_id" : ObjectId("4fdf28f09d16204d66082fa3"), "a" : 1 }
5) customize configuration
# vim /etc/mongodb.conf
# systemctl restart mongod.service
6) make mongodb service automatically start at boot
# systemctl enable mongod.service
Update for Fedora 18
When started for the first time by systemd on a slow or loaded machine, mongod service might timeout before finishing its initialization, with systemd flagging the service as failed.
Symptoms:
# journalctl -xn
-- Unit mongod.service has begun starting up.
10:38:43 local mongod[24558]: forked process: 24560
10:38:43 local mongod[24558]: all output going to: /var/log/mongodb/mongodb.log
10:40:13 local systemd[1]: mongod.service operation timed out. Terminating.
10:40:13 local systemd[1]: Failed to start High-performance, schema-free document-oriented database.
-- Subject: Unit mongod.service has failed
Very easy cure, restart the service:
# systemctl restart mongod.service
this should finish the initialization successfully and leave the daemon in running state.

Answer 2

I just had the same issue and in my case it was caused by installing mongodb following instructions of some websites using non-official repo. If you have the same issue and the answer above are not solving your problem, try uninstalling "mongodb-org" package and reinstalling it following the instructions of the official documentation : https://docs.mongodb.com/manual/tutorial/install-mongodb-on-red-hat/
Remainder to uninstall package in fedora:
sudo dnf remove <package-name>