ExecStart=/usr/bin/mongod --config /etc/mongod.conf (code=exited, status=1/FAILURE) code example
Example 1: Process: 12270 ExecStart=/usr/bin/mongod --config /etc/mongod.conf (code=exited, status=14)
chown -R mongodb:mongodb /var/lib/mongodb
chown mongodb:mongodb /tmp/mongodb-27017.sock
sudo service mongod restart
Example 2: ExecStart=/usr/bin/mongod --quiet --config /etc/init/mongod.conf (code=exited, status=100)
cd /var/lib/mongodb
sudo chown -R mongodb:mongodb *
sudo service mongod restart