Ruben L. Mendoza Rub21

Docker Cli Tips and Tricks

My favorite command line options and best practices

Bash/zsh completion
use Tab to populate command line, narrows down options as you go, fills in container names, ID's, images, volumes. Huge time saver.

Overview

When you're working on multiple coding projects, you might want a couple different version of Python and/or modules installed. That way you can keep each project in its own sandbox instead of trying to juggle multiple projects (each with different dependencies) on your system's version of Python. This intermediate guide covers one way to handle multiple Python versions and Python environments on your own (i.e., without a manager like Anaconda). See the Using the workflow section to view the end result.

Use cases

Working on 2+ projects that each have their own dependencies; e.g., a Python 2.7 project and a Python 3.6 project, or developing a module that needs to work across multiple versions of Python. It's not reasonable to uninstall/reinstall modules every time you want to switch environments.
If you want to execute code on the cloud, you can set up a Python environment that mirrors the relevant cloud

A Mapbox GL JS demo that creates a layer from a third-party tiles source and draws it below the Mapbox Style's label layers. Layers in the Mapbox GL Style Spec draw in the order in which they're listed in the layers array.

Look for the following in the style JSON below:

"sources": {
        "mapbox": {
            "url": "mapbox://mapbox.mapbox-streets-v7",
            "type": "vector"
 },

What is your folder-structure preference for a large-scale Node.js project?

0: Starting from Rails

This is the reference point. All the other options are based off this.

|-- app
|   |-- controllers
|   |   |-- admin

Directory structure for JavaScript/Node Projects

While the following structure is not an absolute requirement or enforced by the tools, it is a recommendation based on what the JavaScript and in particular Node community at large have been following by convention.

Beyond a suggested structure, no tooling recommendations, or sub-module structure is outlined here.

Directories

lib/ is intended for code that can run as-is
src/ is intended for code that needs to be manipulated before it can be used

	#!/bin/bash
	[[ ! -n $5 ]] && echo "Usage: [ROTATE=90] gradientvideo <input.mp4> <r> <g> <b> <output.mp4>" && exit
	set -x
	[[ -n $ROTATE ]] && ROTATE=",scale=w=1.5iw:h=1.5ih,rotate=angle=$ROTATE"
	ffmpeg -i "$1" -filter_complex "[0]split[v0][v1];[v0]format=rgba,geq=r=$2:g=$3:b=$4:a=255*(Y/H)$ROTATE[fg];[v1][fg]overlay=(W-w)/2:(H-h)/2:shortest=1" -q:v 2 "$5"

	EPSG: 4326 uses a coordinate system on the surface of a sphere or ellipsoid of reference.
	WGS 84 - Earth as Geoid. -Mercator

	EPSG: 3857 uses a coordinate system PROJECTED from the surface of the
	sphere. Earth as perfectly sphere. -Web Mercator

	Think of it as this way:

	EPSG 4326 uses a coordinate system the same as a GLOBE (curved surface).
	EPSG 3857 uses a coordinate system the same as a MAP (flat surface).

	wget https://github.com/google/protobuf/releases/download/v2.6.0/protobuf-2.6.0.tar.bz2
	tar xvf protobuf-2.6.0.tar.bz2
	cd protobuf-2.6.0
	./configure CC=clang CXX=clang++ CXXFLAGS='-std=c++11 -stdlib=libc++ -O3 -g' LDFLAGS='-stdlib=libc++' LIBS="-lc++ -lc++abi"
	make -j 4
	sudo make install
	protoc --version

	function slugify(text)
	{
	return text.toString().toLowerCase()
	.replace(/\s+/g, '-') // Replace spaces with -
	.replace(/[^\w\-]+/g, '') // Remove all non-word chars
	.replace(/\-\-+/g, '-') // Replace multiple - with single -
	.replace(/^-+/, '') // Trim - from start of text
	.replace(/-+$/, ''); // Trim - from end of text
	}

	<!DOCTYPE html>
	<html>
	<head>
	<meta charset=utf-8 />
	<title>Leaflet Image</title>
	<meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
	<script src='https://api.tiles.mapbox.com/mapbox.js/v2.0.1/mapbox.js'></script>
	<link href='https://api.tiles.mapbox.com/mapbox.js/v2.0.1/mapbox.css' rel='stylesheet' />
	<style>
	body { margin:0; padding:0; }