CentOS7 deployment Flask (Apache, mod_wsgi, Python36, venv)

1. Install Apache

# yum install -y httpd httpd-devel

# systemctl start httpd.service # Start # systemctl stop httpd.service # Shutdown # systemctl restart httpd.service # Restart # systemctl enable httpd.service # Start automatically at boot

Open port 80 on the firewall

# firewall-cmd --zone=public --add-port=80/tcp --permanent
# firewall-cmd --reload

Open Apache, and the external network can access Apache's default page through IP

2. Install Python36, pip3, and virtualenv

# yum install -y epel-release
# yum install -y python36
# python36 -V
Python 3.6.6

# yum install -y python36-setuptools
# easy_install-3.6 pip
# pip3 -V
pip 18.1 from /usr/local/lib/python3.6/site-packages/pip-18.1-py3.6.egg/pip (python 3.6)

# pip3 install virtualenv

3. Create a project

Create a flask project (the simplest, a project folder, a startup file)

# mkdir /var/www/flask_test # Project folder# vi /var/www/flask_test/app.py # Startup file

Example of startup file:

from flask import Flask, request
 
app = Flask(__name__)
 
@app.route('/')
def hello_world():
  return 'Hello World'
 
@app.route('/hello')
def hello():
  name = request.args.get('name','')
  return 'Hello ' + name + '!'
 
if __name__ == '__main__':
  app.run()

Create a virtual environment in the project folder and install flask

# cd /var/www/flask_test
# virtualenv py3env # Create a virtual environment # source py3env/bin/activate # Enter the virtual environment (py3env) # pip install flask # Install flask
(py3env) # deactivate # Exit the virtual environment

4. Install mod_wsgi with pip in a virtual environment

# yum install -y python36-devel.x86_64 # A dependency. If it is not installed, pip will report an error below. .
# source py3env/bin/activate # Enter the virtual environment (py3env) # pip install mod_wsgi # Install mod_wsgi
(py3env) # mod_wsgi-express install-module # Execute the command and copy the output LoadModule wsgi_module "/usr/lib64/httpd/modules/mod_wsgi-py36.cpython-36m-x86_64-linux-gnu.so"
WSGIPythonHome "/var/www/flask_test/py3env"
 
(py3env) # deactivate # Exit the virtual environment

Modify Apache configuration

# vi /etc/httpd/conf/httpd.conf

Copy the line obtained above and add it to the end of the configuration file

Copy the code as follows:

 LoadModule wsgi_module "/usr/lib64/httpd/modules/mod_wsgi-py36.cpython-36m-x86_64-linux-gnu.so"

5. Configure mod_wsgi

# vi /var/www/html/flask_test/app.wsgi

Write the following (according to: https://dormousehole.readthedocs.io/en/latest/deploying/mod_wsgi.html)

activate_this = '/var/www/flask_test/py3env/bin/activate_this.py'
with open(activate_this) as file_:
  exec(file_.read(), dict(__file__=activate_this))
 
import sys
sys.path.insert(0, '/var/www/flask_test')
from app import app as application

Configure Apache

# vi /etc/httpd/conf/httpd.conf

Write the following (according to: https://dormousehole.readthedocs.io/en/latest/deploying/mod_wsgi.html#id1)

<VirtualHost *:80>
  ServerName example.com
  WSGIScriptAlias / /var/www/flask_test/app.wsgi
  <Directory /var/www/flask_test>
    Require all granted
  </Directory>
</VirtualHost>

OK, start Apache, and you can access the web page through the IP of this server

Test some two paths written in app.py

The above is the full content of this article. I hope it will be helpful for everyone’s study. I also hope that everyone will support 123WORDPRESS.COM.

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