Couldn't Start Mongo DB

Question

 mongod.service - MongoDB Database Server
   Loaded: loaded (/lib/systemd/system/mongod.service; disabled; vendor preset: enabled)
   Active:  (Result: exit-code) since Mon 2020-04-20 13:32:29 IST; 6min ago
     Docs: https://docs.mongodb.org/manual
  Process: 27917 ExecStart=/usr/bin/mongod --config /etc/mongod.conf 
 Main PID: 27917 (code=exited, status=14)

Apr 20 13:32:29 manojkumar systemd[1]: Started MongoDB Database Server.
Apr 20 13:32:29 manojkumar systemd[1]: 
Apr 20 13:32:29 manojkumar systemd[1]: 

Answer 1

It looks like mongo db fails to startup, usually it can be because the lack of permissions on mongodb's internal folders.

Try to check/set:

chown -R mongodb:mongodb /var/lib/mongodb
chown mongodb:mongodb /tmp/mongodb-27017.sock

I've found the thread that talks about here

Answer 2

To whoever comes here with the same problem of not able to start mongodb with the command (sudo systemctl status mongod) after successful installation:

I had to set ulimit -n 64000 to get it to work. This is actually mentioned in the installation docs here which I had ignored initially.

Answer 3

 mongod.service - MongoDB Database Server
   Loaded: loaded (/lib/systemd/system/mongod.service; disabled; vendor preset: enabled)
   Active:  (Result: exit-code) since Mon 2020-04-20 13:32:29 IST; 6min ago
     Docs: https://docs.mongodb.org/manual
  Process: 27917 ExecStart=/usr/bin/mongod --config /etc/mongod.conf 
 Main PID: 27917 (code=exited, status=14)

Apr 20 13:32:29 manojkumar systemd[1]: Started MongoDB Database Server.
Apr 20 13:32:29 manojkumar systemd[1]: 
Apr 20 13:32:29 manojkumar systemd[1]: