Vagrant, Flask — App not running on 10.10.10.10, 127.0.0.1

Question

I'm running an app on my local box via Vagrant. The Python/Flask app launches and prints:

* Running on http://127.0.0.1:5000/ * Restarting with reloader

I found this https://github.com/makersquare/student-dev-box/wiki/Using-Vagrant-for-Development#testing-web-based-applications-in-vagrant which suggests that Vagrant apps run on 10.10.10.10 (not 127.0.0.1), but when I navigate to that IP address (port 5000), I get the same result: "This webpage is not available".

Question: my app is running, but on what IP address? I can't seem to find it. Do I need to modify some configuration files?

Thanks in advance.

@jedwards yes. I tried 10.10.10.10:5000 and 127.0.0.1:5000 (and just plain ole localhost:5000 for kicks and giggles). — tmthyjames, Mar 16 '15 at 22:27
@tmthyjames If you find the answer helpful, please mark it as accepted ;) — sjudǝʊ, Aug 02 '16 at 09:12
@sjudǝʊ sorry about that! Your answer def helped. Thanks! I accepted it. — tmthyjames, Aug 02 '16 at 17:28

sjudǝʊ · Accepted Answer · 2015-03-17T19:01:40.227

There are many ways how you could run flask web app on virtual machine (managed by vagrant). I think that following approach is quite flexible, because you don't have to deal with different ip address. Also it looks like you are developing on a host machine.

There are 2 things you need to configure. In VagranFile, you need configure port forwarding.

Vagrant.configure(2) do |config|
  # use default box
  config.vm.box = "ubuntu/trusty64"

  # forward port guest machine:5000 -> host machine:5000
  # port 5000 is default for flask web app
  config.vm.network "forwarded_port", guest: 5000, host: 5000
end

Then, on virtual machine, you should start flask app on ip 0.0.0.0 which means that web app will serve for any IP address. More on this topic -> flask doc section Externally Visible Server

if __name__ == "__main__":
    app.run("0.0.0.0", debug=True)

That's it. You should be able to connect to http://localhost:5000

score 1 · Answer 2 · answered Mar 17 '15 at 02:27

1

In the file where you call app.run, it should be

app.run(host='0.0.0.0', port=...

In the host OS, navigate to the IP of the guest with the port that you're running the app from.

answered Mar 17 '15 at 02:27

Celeo

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score 1 · Answer 3 · answered Jun 04 '18 at 05:15

1

sjudǝʊ is right but it took me 4 hours to figure out he forgot to mention you also must run:

vagrant halt and then vagrant up

in order for your update to the vagrant file to actually take affect

answered Jun 04 '18 at 05:15

Tommy Boner

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score 1 · Answer 4 · edited Jan 31 '19 at 06:05

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In the latest version of Flask and python you do not need to configure vagrant file or no change required in the python script. Just run the flask with --host

flask run --host=192.168.10.80

edited Jan 31 '19 at 06:05

Kingsley

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answered Jan 31 '19 at 04:27

Anand

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Vagrant, Flask — App not running on 10.10.10.10, 127.0.0.1

4 Answers4