Leland Later llater

How To Serve Flask Applications with uWSGI and Nginx on Ubuntu 14.04

@credit Yan Zhu (https://github.com/nina-zhu)

Introduction

Flask is a microframework for Python based on Werkzeug, Jinja 2 and good intentions, it can help you get your Python application or website off the ground. Flask includes a simplified development server for testing your code locally, but for anything even slightly production related, a more secure and powerful web server is required.

In this guide, we will demonstrate how to install and configure some components on Ubuntu 14.04 to support and serve Flask applications. We will configure the uWSGI application container server to interface with our applications. We will then set up Nginx to reverse proxy to uWSGI, giving us access to its security and performance features to serve our apps.

Prerequisites and Goals

How to setup Let's Encrypt for Nginx on Ubuntu 18.04 (including IPv6, HTTP/2 and A+ SLL rating)

Virtual hosts

Let's say you want to host domains first.com and second.com.

Create folders for their files:

Commit, clone a container

To 'clone' a container, you'll have to make an image of that container first, you can do so by "committing" the container. Docker will (by default) pause all processes running in the container during commit to preserve data-consistency.

For example;

docker commit --message="Snapshot of my container" my_container my_container_snapshot:yymmdd

UFW

I use Ubuntu’s Uncomplicated firewall because it is available on Ubuntu and it's very simple.

Install UFW

if ufw is not installed by default be sure to install it first.

Flask + uWSGI + nginx Primer

I've been having trouble with serving a Flask app via uWSGI and nginx, so I thought I'd put together some of the basics to help out others.

How this shit works

Flask is managed by uWSGI.
uWSGI talks to nginx.

#Setting up Nginx on Your Local System ###by Keith Rosenberg

##Step 1 - Homebrew The first thing to do, if you're on a Mac, is to install homebrew from http://mxcl.github.io/homebrew/

The command to type into terminal to install homebrew is:

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

	#!/bin/sh
	# option 2: paste this into user-data to automate install via boot script
	# NOTE: update --label=owner=YOURNAME below if you want to easily identify yours

	# renames the host to have a suffix of alexellisio
	export original=$(cat /etc/hostname)
	sudo hostname $original-master-alexellisio
	echo $original-master-alexellisio \| sudo tee /etc/hostname

	apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D

	# VERSION 1.0.4
	# Author: @madhavajay
	# This currently works for iOS and watchOS in the Simulator and Devices

	# Changes
	# Using ${TOOLCHAIN} in two places now
	# Added double quotes " around paths
	# Fixed watchOS Issues

	# Instructions iOS

	#!/bin/bash -e

	function compressResource {
	gzip --best --stdout "$1" >"$1.gz"
	touch --no-create --reference="$1" "$1.gz"

	echo "Compressed: $1 > $1.gz"
	}

	function main {

	def add_subdomain_to_global(endpoint, values):
	g.subdomain = values.pop('subdomain', None)

	def add_subdomain_to_url_params(endpoint, values):
	if not 'subdomain' in values:
	values['subdomain'] = g.subdomain

	def add_subdomain_support(app):
	app.url_value_preprocessor(add_subdomain_to_global)
	app.url_defaults(add_subdomain_to_url_params)