Flask

Flask

• python 3.6.4
• version 0.12
• gunicorn 19.8.1

Install flask and packages dependancy

1. Install pyenv installer
2. Install pyenv
   • create virtual python directory

python -m venv pyflask

• using python virtual environment

source /home/hadn/pyflask/bin/activate

3. Install flask and nginx
   • pip install flask flask-migrate flask-debugtoolbar flask-login flask-sqlalchemy psycopg2-binary flask-wtf gunicorn
   • yum install -y nginx
   • download and untar source code
     • wget https://github.com/alochym01/freeswitch_flask_gui/archive/0.3.tar.gz
     • tar -xvf 0.3.tar.gz
4. Configuration
   • run all requirement steps

export DATABASE_URL="postgresql://freeswitch:[email protected]:5432/freeswitch"
export FLASK_APP=freeswitch.py
flask db init
flask db migrate
flask db upgrade
flask initdb

sudo gpasswd --add nginx hadn
sudo chmod 710 /home/hadn

vi config.py
SQLALCHEMY_DATABASE_URI = "postgresql://freeswitch:[email protected]:5432/freeswitch"

5. Using flask, gunicorn, nginx and systemd

• systemd

vi /etc/systemd/system/flaskapp.service

[Unit]
Description = Flask GUI for Freeswitch
After = network.target postgresql-9.6.service redis.service

[Service]
PermissionsStartOnly = true
PIDFile = /run/flask_app/flask_app.pid
User = hadn
Group = hadn
WorkingDirectory = /home/hadn/freeswitch_flask_gui-0.3
ExecStartPre = /bin/mkdir /run/flask_app
ExecStartPre = /bin/chown -R hadn:hadn /run/flask_app
ExecStart = /home/hadn/pyflask/bin/gunicorn freeswitch:app -b 127.0.0.1:8000 -w 4 --pid /run/flask_app/flask_app.pid
ExecReload = /bin/kill -s HUP $MAINPID
ExecStop = /bin/kill -s TERM $MAINPID
ExecStopPost = /bin/rm -rf /run/flask_app
PrivateTmp = true

[Install]
WantedBy = multi-user.target

• nginx

server {
    # listen on port 80 (http)
    listen 80;
    server_name _;
    location / {
        # redirect any requests to the same URL but on https
        return 301 https://$host$request_uri;
    }
}
server {
    # listen on port 443 (https)
    listen 443 ssl;
    server_name _;

    # location of the self-signed SSL certificate
    ssl_certificate /home/ubuntu/microblog/certs/cert.pem;
    ssl_certificate_key /home/ubuntu/microblog/certs/key.pem;

    # write access and error logs to /var/log
    access_log /var/log/microblog_access.log;
    error_log /var/log/microblog_error.log;

    location / {
        # forward application requests to the gunicorn server
        proxy_pass http://localhost:8000;
        proxy_redirect off;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }

    location /static {
        # handle static files directly, without forwarding to the application
        alias /home/hadn/freeswitch_flask_gui-0.3/flask_app/static;
        expires 30d;
    }
}