If you're having trouble installing Mongo on Mac.

Many of you may have ran in to this problem: You've installed mongo with HomeBrew and after entering

mongod

you've run into an error stating:

 IllegaleOperation: Attempting to create a lock file on a read-only directory: /data/db, terminating

The problem is not the directory, it's a Permissions problem and you'll need to change the ownership of that directory, first by entering:

whoami

so that you know what your system name is. Then enter:

sudo chown -Rv Your system name  /data/db

Then enter:

 mongod

everything should work fine.

control c to quit mongo and mongod

I also highly recommend you do one more thing. After you've shut out of mongo and mongod with

control c

clear the terminal with

clear

and enter:

brew services start mongo

This will allow you to skip having to enter "mongod" on one terminal and having to run "mongo" on another terminal every time you want to use it.