Cant access mongodb shell and mongo errored - node.js

Question

I installed mongo following this tutorial with the exception that I ran the service with pm2 because I can actually tell what I am doing with pm2.
I then have been trying to follow this tutorial however I cant even access the shell.
I have tried the following commands and none of them work:
./bin/mongo causes a file not found error whether it is in my project file or in the /var/lib/mongodb folder where the db is supposedly "installed"
Additionally
mongo localhost:27017 (or just mongo)
causes
MongoDB shell version: 3.2.19
connecting to: test
2018-02-12T20:15:59.009+0000 W NETWORK [thread1] Failed to connect to 127.0.0.1:27017, in(checking socket for error after poll), reason: errno:111 Connection refused
2018-02-12T20:15:59.009+0000 E QUERY [thread1] Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed :
connect#src/mongo/shell/mongo.js:229:14
#(connect):1:6
exception: connect failed
My log file (from /var/log/mongodb/mongod.log) can be found here. I do have some confusion about it:
Why did it shut down
Why is the host=GraphicsApplications? That is an old folder that I have since deleted on my machine. It was my first attempt at getting this going but back then I was hosting my DB with mlab. The folder/name it lists no longer exists. For some reason though the start of every line in terminal says root#GraphicsApplications. Not sure where that name came from... perhaps I named the box that?
Ultimately I dont know exactly how that tutorial had me install mongodb. Sure I installed the packages and everything but I dont feel like I ever really created anything if that makes sense.
It is worth noting that pm2 does show the status of the mongod app as "errored" currently but I am not sure why or for how long it stayed up.
I am just trying to get my database running on my own Linux box rather than mlab. I had everything working with mlab but now want to be hosting my db on localhost.

Answer 1

Looking in the logs it says that your hostname is host=GraphicsApplications
But in your actual hosts file you have 127.0.1.1 GraphicsApplications GraphicsApplications
Edit this line in your hosts file to be just 127.0.1.1 GraphicsApplications
Then save the file and rerun mongod. Hopefully that should do it.

Answer 2

Regarding file not found:
Try running from the cmd line:
which mongo
If that doesn’t show any result then the mongo binariesarn’t in your PATH env variable, in which case try
find / -name “mongo*”
That should then show where your mongo binaries have been installed.
If you know where the binaries are installed then running:
./bin/mongo
Presumes you’re in the mongo home dir, so you would need to run;
/var/lib/mongodb/bin/mongo
Regarding connection refused
could be an iptables rule, try disabling it and starting mongo
sudo ufw disable
hostfile
Comment out this
127.0.1.1 GraphicsApplications
And change/add this
127.0.0.1 localhost localhost.localdomain
As per : https://jira.mongodb.org/plugins/servlet/mobile#issue/SERVER-20952