Quick and Dirty Python Deployments with Heroku

Quick and Dirty Python

Deployments with HerokuDeployments with Heroku

Guest starring Flask, CoffeeScript, Fabric, and SeatGeek

Daniel Pritchett for MEMpy,

March 19, 2012

Painless Heroku Startup

Requirements

• Python 2.7

• virtualenv

• pip

• Rubygems• Rubygems

• Procfile / foreman

Get started

• Install git, foreman, pip, virtualenv

• Clone/create a repo with a Procfile that

starts a HTTP service

• foreman start to test it locally• foreman start to test it locally

• heroku create app_name –

stack=cedar && git push heroku

master

Setup log

$ virtualenv --no-site-packages heroku_demo

New python executable in heroku_demo/bin/python

Installing pip...............cdone.

$ cd heroku_demo/

$ . bin/activate

$ git clone git://github.com/dpritchett/wwebsite-python.git app

$ cd app

$ pip install -r ./requirements.txt

Successfully installed Flask Jinja2 Pygments Werkzeug chardet gunicorn

$ foreman start

13:20:18 web.1 | started with pid 17810

13:20:18 web.1 | 2012-03-19 13:20:18 [17810] [INFO] Starting gunicorn 0.14.1

13:20:18 web.1 | 2012-03-19 13:20:18 [17810] [INFO] Listening at: http://0.0.0.0:5000

$ heroku create mempy-demo --stack=cedar

Creating mempy-demo... done, stack is cedar

http://mempy-demo.herokuapp.com/ | git@heroku.com:mempy-demo.git

Git remote heroku added

$ git push heroku master

Procfile declares types -> web

http://mempy-demo.herokuapp.com deployed to Heroku

$ curl mempy-demo.herokuapp.com

Hello World!

Foreman’s Procfile defines the service

web: gunicorn app:APP -b 0.0.0.0:$PORT -w 3

You can run the same thing at the console to test:You can run the same thing at the console to test:

$ gunicorn app:APP -b 0.0.0.0:$PORT -w 3

Heroku logging• Captures stdout, stderr

• You’ll need it since you have no persistent disk

• Simplest case you can just use a print statement

• Free plan has limitations

• Consider an offsite log manager

Remote console

$ heroku run bash

Running bash attached to terminal... up, run.2

~ $ find templates

templates

templates/index.html

~ $ find static

static

static/jsstatic/js

static/js/memphis_tickets.js

static/coffee

static/coffee/memphis_tickets.coffee

static/bootstrap

static/bootstrap/js

static/bootstrap/js/bootstrap.js

static/bootstrap/css/bootstrap.css

static/css

static/css/tickets.css

Sample Flask application:

TicketsOfMemphis.com

The entire backend

HTML templating (Jinja2)

CoffeeScript excerpts

Data provided by SeatGeek API

Honorable mention: Fabric$ fab s

[localhost] local: coffee -o ../js/ --compile

./*coffee

[localhost] local: foreman start

14:11:29 web.1 | started with pid 24218