I am trying to use the flask development server at an office with a strict proxy that blocks the default 127.0.0.1:5000 host and port. I have tried using different hosts and ports with no success. I have also tried setting up Flask with XAMPP on Windows via mod_wsgi with no success. I am looking for an option to continue testing flask on my local machine with as little setup as possible as my production environment is a PaaS and does not use the same setup as my local machine.
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First, I tested and confirmed that my Flask Python script works fine on my local machine. But I'm having problems while using it in the Azure compute instance inside the Machine learning Studio. Below is what I experienced:
My command:
flask run --host=0.0.0.0
It returned as beblow:
* Serving Flask app "server"
* Environment: production
WARNING: This is a development server. Do not use it in a production deployment.
Use a production WSGI server instead.
* Debug mode: off
* Running on all addresses.
WARNING: This is a development server. Do not use it in a production deployment.
* Running on http://10.0.0.4:5000/ (Press CTRL+C to quit)
10.0.0.4 is the private IP of this Azure compute instance, and I couldn't access it using my local computer and Internet. The error came back as Connection Timed Out.
How could I access it using my local computer and Internet?
I tried http://(its public IP address) :5000/
But the same error was returned.
Other Notes: Vnet is enabled for this compute instance, as well as Port 5000 under Network Security Group.
Azure compute instance (in the machine learning studio) is not accessible by the external IPs even the one with an assigned public IP address. Even SSH to these instances needs to be preconfigured, rather than changing the network inbound rules.
But the actual virtual machine will allow this. If you have the similiar problem, I would recommend try Azure virtual machines instead.
I have a flask app that I have cloned onto my aws ec2 instance. I can only run it using a virtual environment (which I activate by running the following):
$ python3 -m venv venv
$ source venv/bin/activate
$ pip install --upgrade pip
$ pip install flask==1.1.1
Below is my app:
from flask import Flask
app = Flask(__name__)
#app.route("/")
def hello():
return "Hello World!"
if __name__ == "__main__":
app.run()
It runs just fine when executing env FLASK_APP=app.py flask run. The problem is, I'd like to access the exposed routes remotely using my aws ec2's public IP or hostname. I get a tiemout error whenever I try to access it though. I think this is because i'm running the flask app in a virtual environment but I'm not sure. I can't find any good tutorials on how to expose this. Where am I going wrong here?
Quick n' safe solution:
As you're running the development server, which isn't meant for production. I would say the best way to connect to this app from just your own machine, is with an ssh tunnel:
ssh -L 5000:localhost:5000 ec2_addr
You can then point your web-browser to http://localhost:5000/ on your client machine, which will be tunneled to port 5000 on the EC2 instance. This is a fast way to connect to a Flask (or any) server on a remote Linux box. The tunnel is destroyed when you stop that ssh session.
Longer method:
I'd like to access the exposed routes remotely using my aws ec2's public IP or hostname.
The timeout isn't because it's running in a virtual environment: You'll probably find it's because you need to assign Security Groups to your instance through the EC2 console. These allow you to open certain ports on the public IP.
See this other answer I wrote, regarding EC2 security groups.
However be careful. You shouldn't expose the development server in this manner. There are a number of tutorials like this one from digital ocean which cover deploying a flask app behind gunicorn and nginx with a Let's Encrypt SSL cert. You should find yourself in a position where your security group exposes port 80 and 443, with requests to port 80 being redirected to the https URL by the nginx configuration.
If this sounds like a whole load of hassle / you don't have Linux skills / you don't want to learn Linux skills, then these are common reasons people pick managed services like AWS Elastic Beanstalk, to which you can deploy your flask app (official guide), without having to worry about server config. Heroku is another (non AWS) service which offers such features.
It really depends on what you require / wish to gain. Stay safe!
I'm new to setting up a server for python apps, slowly getting my head round all the tools and config options.
I'd like to configure a testing instance on an existing server that has plesk and apache installed. I managed to set up the python environment, virtualenv, the flask app inclusive database and run it successfully on http://domain.test:5000 however I'd need to remove the port number from the domain.
Gunicorn seems to be the tool for that, however I'm not sure how to go about it as plesk is apparently installed on port 80 - so is there any way to get this configured on that server with some port hiding/masking/redirect or do I need to move to a standalone server?
Additionally I'd like to add a ssl certificate to that domain but one step at the time...
The method run on a Flask application takes a keyword argument port:
from flask import Flask
app = Flask(__name__)
app.run(port=80)
Of course you'll need root privileges to run on port 80
If I run my flask app on my local machine I get proper results by connecting to http://127.0.0.1:5000/report?id=1
But now I want to make it externally visible by deploying my flask in a VM in azure. I have opened the port 80 on my VM. And I'm running the flask app using this:
if __name__ == '__main__':
app.run(host='0.0.0.0')
I'm still not able to connect to my flask server using this (assume the public IP address of my VM is x.x.x.x):
http://x.x.x.x:5000/report?id=1
Any suggestions how should I go ahead with it?
Edit: I'm able to psping my VM's public IP address on port 80.
The problem isn't related to Flask, since you opened up your application to listen on any public IP (0.0.0.0).
Moreover you should do a proper port mapping in your azure configuration. Google said, you might have a look here: https://azure.microsoft.com/en-us/documentation/articles/virtual-machines-set-up-endpoints/
EDIT
Another idea, where some colleages often run into, is that you may have skype open which somewhat uses port 80/443 and therefore is blocking it. Shutdown skype if you do so or use a different port for your webapp.
So here's the deal with Azure:
If you open a port from the Azure portal, the firewall in your VM STILL blocks that port. You have to manually go in and create a firewall setting in your VM to keep the port 5000 open for your flask server. Once that is done, you should be able to connect to it.
I'm following Flask Quickstart guide and can run my web app via http://myip.com:5000.
One issue is that my web is only accessible as long as I keep my SSH remote connection session - when I sleep/shutdown my PC, the website shutdown too.
How can I make it permanent available?
You need to use a regular web server, such as apache2. You can't use the python server for production purposes. Here is how you do it with apache: http://flask.pocoo.org/docs/0.10/deploying/mod_wsgi/