Failed to start mongod

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Recently I installed MongoDB from Fedora official repositories. When execute:

$ sudo systemctl start mongod
[sudo] password for brallan: 
Job for mongod.service failed. See "systemctl status mongod.service" and "journalctl -xe" for details.

$ systemctl status mongod.service
● mongod.service - High-performance, schema-free document-oriented database
   Loaded: loaded (/usr/lib/systemd/system/mongod.service; enabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since vie 2015-11-13 21:29:28 CST; 10s ago
  Process: 5835 ExecStart=/usr/bin/mongod $OPTIONS run (code=exited, status=100)

nov 13 21:29:28 hikari systemd[1]: Starting High-performance, schema-free document-oriented database...
nov 13 21:29:28 hikari mongod[5835]: about to fork child process, waiting until server is ready for connections.
nov 13 21:29:28 hikari mongod[5835]: forked process: 5841
nov 13 21:29:28 hikari mongod[5835]: ERROR: child process failed, exited with error number 100
nov 13 21:29:28 hikari systemd[1]: mongod.service: control process exited, code=exited status=100
nov 13 21:29:28 hikari systemd[1]: Failed to start High-performance, schema-free document-oriented database.
nov 13 21:29:28 hikari systemd[1]: Unit mongod.service entered failed state.
nov 13 21:29:28 hikari systemd[1]: mongod.service failed.

How can I start properly MongoDB?

Some technical aspects:

• Package mongodb-2.6.11
• Package mongodb-server-2.6.11
• 64 bits system