flask实战: 1.2.0 初始化flask-app_initial,nginx,uwsgi

1. initial flask app

1) activate virtual env

source /vagrant/flask_blog/bin/activate

2) create app directory

cd /vagrant/flask_blog
mkdir MyBlog

3) create basic directory

cd MyBlog
mkdir ./{static,templates}

4) create app initial file

vi init.py

from flask import Flask

app = Flask(__name__)

@app.route('/')
def homepage():
    return "Hi there, how ya doing?"


if __name__ == "__main__":
    app.run()

after run vi init.py, press i into insert mode. after finish input, press ESC and input :wq to save and quit

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2. run test

# as we install Flask before, so you can run it directly.
# if you see the output is same with below, it means everything is good.
python __init__.py
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)

although we can run flask like this, but it only listen 127.0.0.1 and can not persistence. so we need a web server to proxy requests and use uwsgi to process these requests.

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3. deploy web server and configure uwsgi

1) install nginx(web server, you can choose apache also) and uwsgi

yum install nginx -y
pip install uwsgi

2) configure uwsgi

vi /vagrant/flask_blog/wsgi.py

from MyBlog import app

if __name__ == "__main__":
    app.run()

3) uwsgi test and make configuration file

# use command line to test first
uwsgi --socket 0.0.0.0:8000 --file /vagrant/flask_blog/wsgi.py --callable app --protocol=http

# use configuration file test second
# uwsgi configuration file
vim /vagrant/flask_blog/myblog.ini
************************
[uwsgi]
chdir = /vagrant/flask_blog
module = wsgi:app

master = true
processes = 5
threads = 2
buffer-size = 8192

socket = 127.0.0.1:8001
************************
# chdir is the folder where wsgi.py located in

# module indicate first wsgi-file(wsgi)
# and then application name which assigned in "__init__.py"

# master = True is setting master mode
# processes indicate the number of processes which forked by master process
# buffer-size indicate the request block size

然后两种方法都用浏览器测试一下，访问ip:8000端口，查看结果

4) configure nginx

vi /etc/nginx/conf.d/uwsgi.conf

server {
        listen 80;
        server_name 192.168.33.10;
        access_log /var/log/nginx/uwsgi_access.log;
        error_log /var/log/nginx/uwsgi_error.log;
        location / {
            include        uwsgi_params;
            uwsgi_pass     127.0.0.1:8001;
            uwsgi_param UWSGI_PYHOME /vagrant/flask_blog;
            uwsgi_param UWSGI_CHDIR /vagrant/flask_blog;
            uwsgi_param UWSGI_SCRIPT myblog:app;
                }
        }
# server_name should be your server's ip or domain name
# uwsgi_pass should be same with configured in myblog.ini
# UWSGI_SCRIPT indicate uwsgi configuration filename(myblog.ini, but no extension)
# and application name(app)

5) enable and start nginx uwsgi

service nginx start
chkconfig nginx on

# you can write this command into /etc/profile to make it run when OS boot up
uwsgi /vagrant/flask_blog/myblog.ini &