Ronnie Beltran ronbeltran

Diagnosing Redis errors on the client side

Customers periodically ask "Why am I getting errors when talking to Redis". The answer is complicated - it could be a client or server side problem. In this article, I am going to talk about client side issues. For server side issues, see here

Clients can see connectivity issues or timeouts for several reason, here are some of the common ones I see:

Memory pressure

Guide on how to create and set up your Django project with webpack, npm and ReactJS :)

Hopefully this will answer "How do I setup or start a Django project?" I was trying to set up my own website, and there was a lot to read, learn and digest! Therefore, I put this together which is a collection of all the guides/blog posts/articles that I found the most useful. At the end of this, you will have your barebones Django app configured and ready to start building :)

NOTE: This guide was built using Django 1.9.5, NodeJS 4+ with NPM 3+

1. Setting up your dev environment

Django documentation says to use:

WSGIScriptAlias / /path/to/mysite.com/mysite/wsgi.py
WSGIPythonPath /path/to/mysite.com

<Directory /path/to/mysite.com/mysite>
<Files wsgi.py>
Require all granted

Full blog post can be found here: http://pnommensen.com/2014/09/07/high-performance-ghost-configuration-with-nginx/

Ghost is an open source platform for blogging founded by John O'Nolan and Hannah Wolfe. It's a node.js application and therefore works great in conjunction with nginx. This guide will will help you create a high performance nginx virtual host configuration for Ghost.

"Don't use #nodejs for static content" - @trevnorris. If #nginx isn't sitting in front of your node server, you're probably doing it wrong.
— Bryan Hughes (@nebrius) August 30, 2014

The node.js application runs on a port on your server

	{
	"device_model": "iPad",
	"is_bot": false,
	"os_version": "5.1",
	"browser_version": "5.1",
	"device_brand": "Apple",
	"device_type": "Tablet",
	"os": "iOS",
	"browser": "Mobile Safari UI/WKWebView"
	}

	import json
	import requests

	token = "your-api-token"
	headers = {
	"Content-Type": "application/json",
	"Authorization": "Token {}".format(token)
	}
	payload = {
	"useragent": "Mozilla/5.0 (iPad; CPU OS 5_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Mobile/9B176"

	# This specifies the deployment process on AWS ElasticBeanstalk for a Django app using npm and Postgres.
	#
	# The target environment should have access to a Postgres Database through environment variables.
	# The environment can be setup using `eb create --database.engine=postgres`
	# The necessary environment variables to access the database will be automatically defined on the
	# instances of that environment.
	#
	# In addition, the target environment should define environment variables (django secret key ...).
	# They can be manually defined using the AWS ElasticBeanstalk interface on the web.
	# They can also be specified when creating the environment from command line, for example:

	#!/bin/bash

	NAME="hello_app" # Name of the application
	DJANGODIR=/webapps/hello_django/hello # Django project directory
	SOCKFILE=/webapps/hello_django/run/gunicorn.sock # we will communicte using this unix socket
	USER=hello # the user to run as
	GROUP=webapps # the group to run as
	NUM_WORKERS=3 # how many worker processes should Gunicorn spawn
	DJANGO_SETTINGS_MODULE=hello.settings # which settings file should Django use
	DJANGO_WSGI_MODULE=hello.wsgi # WSGI module name

	upstream myapp {
	server 127.0.0.1:8081;
	}

	limit_req_zone $binary_remote_addr zone=login:10m rate=1r/s;

	server {
	listen 443 ssl spdy;
	server_name _;

	LOGGING = {
	'version': 1,
	'disable_existing_loggers': False,
	'handlers': {
	'mail_admins': {
	'level': 'ERROR',
	'class': 'django.utils.log.AdminEmailHandler'
	},
	'null': {
	'level':'DEBUG',