Installing Mongo DB and get this error when start - mongodb

Question

I have followed this steps and install MongoDB in my Linux mint and finally run this command
mongo --host 127.0.0.1:27017
But got this error after run this command.
MongoDB shell version: 3.2.18
connecting to: 127.0.0.1:27017/test
2017-12-21T13:16:20.693+0530 W NETWORK [thread1] Failed to connect to 127.0.0.1:27017, in(checking socket for error after poll), reason: errno:111 Connection refused
2017-12-21T13:16:20.693+0530 E QUERY [thread1] Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed :
connect#src/mongo/shell/mongo.js:231:14
#(connect):1:6
exception: connect failed
I have already run this command also
sudo service mongod start
But after this command,
mongod.service - High-performance, schema-free document-oriented database
Loaded: loaded (/lib/systemd/system/mongod.service; disabled; vendor preset:
Active: failed (Result: exit-code) since Thu 2017-12-21 13:35:28 IST; 6s ago
Docs: https://docs.mongodb.org/manual
Process: 4891 ExecStart=/usr/bin/mongod --quiet --config /etc/mongod.conf (cod
Main PID: 4891 (code=exited, status=100)
I found many solution but did not get it resolved. Thanks in advance.

Answer 1

Make sure mongod service is running locally
sudo service mongod status
and if it's not, run sudo service mongod start
If that doesn't help, try this:
sudo rm /var/lib/mongodb/mongod.lock
sudo mongod --repair
and run service mongod start again
EDIT
Try changing permissions in the mongodb folder
cd /var/lib/mongodb
sudo chown -R mongodb:mongodb *
Also, If that doesn't help, run this
sudo /usr/bin/mongod --config /etc/mongodb.conf
and tell me the output (If it works is doesn't solve your problem, the service startup still needs to be fixed, just curious)