Install Flask on your POWER web hosting plan

Find out how to install Flask on your POWER web hosting plan

Last updated 5th January 2021


You've subscribed to a Web POWER web hosting plan to deploy Python applications, and you want to deploy Flask on it.

This guide will explain how to do it.

Find out how to install Flask on your POWER web hosting plan.


If you have just started to use your Web POWER web hosting plan, we suggest to have a look at our Getting started with a POWER web hosting plan guide before going further.


Let's suppose you have the default configuration for Python hosting:

  • Runtime: Python 3.8
  • Entrypoint:
  • DocumentRoot: www

To verify your configuration, you can use the Retrieve active configuration API endpoint.

To use Python WSGI frameworks, using virtualenv is the simplest choice.

Connect via SSH to your POWER web hosting and activate virtualenv:

cd www
virtualenv venv
source venv/bin/activate

Update pip:

pip install --upgrade pip

Install Flask.

pip install Flask

Create with the following content, using the same trick to activate the virtualenv:

this_file = "venv/bin/"
exec(open(this_file).read(), {'__file__': this_file})

from flask import Flask
application = Flask(__name__)

def hello_world():
    return 'Hello, World!'

Then restart your instance and your Flask project will be online.


Terminal output:

~ $ cd www

~/www $ virtualenv venv
created virtual environment in 1273ms
  creator CPython3Posix(dest=/home/powerlp/www/venv, clear=False, global=False)
  seeder FromAppData(download=False, pip=bundle, setuptools=bundle, wheel=bundle, via=copy, app_data_dir=/home/powerlp/.local/share/virtualenv)
    added seed packages: pip==20.2.2, setuptools==49.6.0, wheel==0.35.1
  activators BashActivator,CShellActivator,FishActivator,PowerShellActivator,PythonActivator,XonshActivator

~/www $ source venv/bin/activate

~/www $ pip install --upgrade pip
Collecting pip
  Using cached pip-21.0.1-py3-none-any.whl (1.5 MB)
Installing collected packages: pip
  Attempting uninstall: pip
    Found existing installation: pip 20.2.2
    Uninstalling pip-20.2.2:
      Successfully uninstalled pip-20.2.2
Successfully installed pip-21.0.1

~/www $ pip install Flask
Collecting Flask
  Using cached Flask-1.1.2-py2.py3-none-any.whl (94 kB)
Collecting itsdangerous>=0.24
  Using cached itsdangerous-1.1.0-py2.py3-none-any.whl (16 kB)
Collecting Werkzeug>=0.15
  Using cached Werkzeug-1.0.1-py2.py3-none-any.whl (298 kB)
Collecting click>=5.1
  Using cached click-7.1.2-py2.py3-none-any.whl (82 kB)
Collecting Jinja2>=2.10.1
  Using cached Jinja2-2.11.3-py2.py3-none-any.whl (125 kB)
Collecting MarkupSafe>=0.23
  Using cached MarkupSafe-1.1.1-cp38-cp38-manylinux2010_x86_64.whl (32 kB)
Installing collected packages: MarkupSafe, Werkzeug, Jinja2, itsdangerous, click, Flask
Successfully installed Flask-1.1.2 Jinja2-2.11.3 MarkupSafe-1.1.1 Werkzeug-1.0.1 click-7.1.2 itsdangerous-1.1.0

~/www $ mkdir -p tmp

~/www $ touch tmp/restart.txt

Go further

Join our community of users on

Join our Gitter room to discuss directly with the POWER Web Hosting team and the other users of this lab.

Did you find this guide useful?

Please feel free to give any suggestions in order to improve this documentation.

Whether your feedback is about images, content, or structure, please share it, so that we can improve it together.

Your support requests will not be processed via this form. To do this, please use the "Create a ticket" form.

Thank you. Your feedback has been received.

These guides might also interest you...

OVHcloud Community

Access your community space. Ask questions, search for information, post content, and interact with other OVHcloud Community members.

Discuss with the OVHcloud community

In accordance with the 2006/112/CE Directive, modified on 01/01/2015, prices exclude VAT. VAT may vary according to the customer's country of residence.