Having trouble installing and using mongodb. on my macosx and a readonly /data/db - mongodb

Question

I want to install Mongodb for my next online web course but the thing is I'm having so much issues. I have been installing and uninstall mongodb so many times I think it's conflicting with temp ... Can someone guide me to the process please, really would appreciate it.
The error when running mongodb:
017-07-02T10:31:41.547-0400 I STORAGE [initandlisten] exception in
initAndListen: 20 Attempted to create a lock file on a read-only
directory: /data/db, terminating 2017-07-02T10:31:41.547-0400 I
NETWORK [initandlisten] shutdown: going to close listening sockets...
2017-07-02T10:31:41.547-0400 I NETWORK [initandlisten] shutdown: going
to flush diaglog... 2017-07-02T10:31:41.547-0400 I CONTROL
[initandlisten] now exiting 2017-07-02T10:31:41.547-0400 I CONTROL
[initandlisten] shutting down with code:100 –
I tried installing it on homebrew , nothing happen, I tried installing it manually still having troubles.. I know my basic like cd,ls,rm,pwd,touch, when using the terminal, If theres process that i can wipe everything associate with mangodb in my Macbook and install it again i have no problem.
found out that /data/db is readonly

Answer 1

MongoDB is already installed but you have some issue launching it.
017-07-02T10:31:41.547-0400 I STORAGE [initandlisten] exception in
initAndListen: 20 Attempted to create a lock file on a read-only
directory: /data/db, terminating 2017-07-02T10:31:41.547-0400 I
NETWORK [initandlisten] shutdown: going to close listening sockets...
2017-07-02T10:31:41.547-0400 I NETWORK [initandlisten] shutdown: going
to flush diaglog... 2017-07-02T10:31:41.547-0400 I CONTROL
[initandlisten] now exiting 2017-07-02T10:31:41.547-0400 I CONTROL
[initandlisten] shutting down with code:100 –
Change the permission of /data/db
sudo chown -R `id -un` /data/db
Now you should start the daemon without problem:mongod
then connect with your mongo client by typing. mongo
ok.. then got this. 2017-07-02T10:50:39.069-0400 I CONTROL
[initandlisten] options: { repair: true, storage: { dbPath: "/data/db"
} } 2017-07-02T10:50:39.069-0400 W - [initandlisten] Detected unclean
shutdown - /data/db/mongod.lock is not empty.
2017-07-02T10:50:39.069-0400 E NETWORK [initandlisten] Failed to
unlink socket file /tmp/mongodb-27017.sock Permission denied
2017-07-02T10:50:39.069-0400 I - [initandlisten] Fatal Assertion 28578
at src/mongo/util/net/listen.cpp 195 2017-07-02T10:50:39.070-0400 I -
[initandlisten] ***aborting after fassert() failure
your /tmp is maybe not readable, try:
chmod 1777 /tmp