How to stop mongo DB in one command

Question

I need to be able to start/stop MongoDB on the cli. It is quite simple to start:

./mongod

But to stop mongo DB, I need to run open m

Answer 1

I followed the official MongoDB documentation for stopping with signals. One of the following commands can be used (PID represents the Process ID of the mongod process):

kill PID

which sends signal 15 (SIGTERM), or

kill -2 PID

which sends signal 2 (SIGINT).

Warning from MongoDB documentation:
Never use kill -9 (i.e. SIGKILL) to terminate a mongod instance.

If you have more than one instance running or you don't care about the PID, you could use pkill to send the signal to all running mongod processes:

pkill mongod

or

pkill -2 mongod

or, much more safer, only to the processes belonging to you:

pkill -U $USER mongod

or

pkill -2 -U $USER mongod

NOTE: If the DB is running as another user, but you have administrative rights, you have invoke the above commands with sudo, in order to run them. E.g.:

sudo pkill mongod
sudo pkill -2 mongod

PS
Note: I resorted to this option, because mongod --shutdown, although mentioned in the current MongoDB documentation, curiously doesn't work on my machine (macOS, mongodb v3.4.10, installed with homebrew):
Error parsing command line: unrecognised option '--shutdown'

PPS
(macOS specific) Before anyone wonders: no, I could not stop it with command
brew services stop mongodb
because I did not start it with
brew services start mongodb.
I had started mongod with a custom command line :-)