zulip/docs/development/setup/vagrant-halt.md

To shut down but preserve the development environment so you can use it again later use vagrant halt or vagrant suspend.

You can do this from the same Terminal/Git BASH window that is running run-dev by pressing ^C to halt the server and then typing exit. Or you can halt Vagrant from another Terminal/Git BASH window.

From the window where run-dev is running:

2016-05-04 18:33:13,330 INFO     127.0.0.1       GET     200  92ms /register/ (unauth@zulip via ?)
^C
KeyboardInterrupt
(zulip-py3-venv) vagrant@vagrant:/srv/zulip$ exit
logout
Connection to 127.0.0.1 closed.
$

Now you can suspend the development environment:

$ vagrant suspend
==> default: Saving VM state and suspending execution...

If vagrant suspend doesn't work, try vagrant halt:

$ vagrant halt
==> default: Attempting graceful shutdown of VM...

Check out the Vagrant documentation to learn more about suspend and halt.