Gustavo Barbosa Castilho gustavobcx

Latency Comparison Numbers (~2012)

Name
L1 cache reference	0.5	ns
Branch mispredict	5	ns
L2 cachereference	7	ns			14x L1 cache
Mutex lock/unlock	25	ns
Main memory reference	100	ns			20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy	3,000	ns	3	us

This will guide you through setting up a replica set in a docker environment using.

Docker Compose
MongoDB Replica Sets
Mongoose
Mongoose Transactions

Thanks to https://gist.github.com/asoorm for helping with their docker-compose file!

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Handling Errors

Express.js makes it a breeze to handle errors in your routes.

Express lets you centralizes your error-handling through middleware.

Let's look at patterns for how to get the most out of your error-handling.

First, our error-handling middleware looks like this:

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:

Moved to git repository: https://github.com/denji/nginx-tuning

NGINX Tuning For Best Performance

For this configuration you can use web server you like, i decided, because i work mostly with it to use nginx.

Generally, properly configured nginx can handle up to 400K to 500K requests per second (clustered), most what i saw is 50K to 80K (non-clustered) requests per second and 30% CPU load, course, this was 2 x Intel Xeon with HyperThreading enabled, but it can work without problem on slower machines.

You must understand that this config is used in testing environment and not in production so you will need to find a way to implement most of those features best possible for your servers.

Install WordPress plugins directly (without FTP)

Ref Stack Overflow Comment

Put this on your wp-config.php

/* That's all, stop editing! Happy blogging. */
define('FS_METHOD', 'direct');

Semantic Commit Messages

See how a minor change to your commit message style can make you a better programmer.

Format: <type>(<scope>): <subject>

<scope> is optional

	<?php

	/*
	Plugin Name: Disable plugins when doing local dev
	Description: If the WP_LOCAL_DEV constant is true, disables plugins that you specify
	Version: 0.1
	License: GPL version 2 or any later version
	Author: Mark Jaquith
	Author URI: http://coveredwebservices.com/
	*/

	sudo apt-get install ssl-cert
	sudo make-ssl-cert generate-default-snakeoil
	sudo usermod --append --groups ssl-cert yyuu
	ls -l /etc/ssl/certs/ssl-cert-snakeoil.pem /etc/ssl/private/ssl-cert-snakeoil.key