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Originally published in June 2008

When hiring Ruby on Rails programmers, knowing the right questions to ask during an interview was a real challenge for me at first. In 30 minutes or less, it's difficult to get a solid read on a candidate's skill set without looking at code they've previously written. And in the corporate/enterprise world, I often don't have access to their previous work.

To ensure we hired competent ruby developers at my last job, I created a list of 15 ruby questions -- a ruby measuring stick if you will -- to select the cream of the crop that walked through our doors.

What to expect

Candidates will typically give you a range of responses based on their experience and personality. So it's up to you to decide the correctness of their answer.

Git Cheat Sheet

Commands

Getting Started

git init

or

The Ultimate Unit Testing Cheat-sheet

Sinon Chai
Chai
Sinon

Setting Up Private GitHub Repos with Bundler on Heroku

To get a private GitHub repo to work on Heroku, you can leverage the netrc buildpack in conjunction with the Heroku Ruby buildpack.

When setting up the Gemfile, make sure to use the https GitHub URL. This mechanism does not work with git+ssh.

gem "some_private_gem", git: "https://github.com/org/some_private_gem.git"

Docker Swarm Mode Ports

Starting with 1.12 in July 2016, Docker Swarm Mode is a built-in solution with built-in key/value store. Easier to get started, and fewer ports to configure.

Inbound Traffic for Swarm Management

TCP port 2377 for cluster management & raft sync communications
TCP and UDP port 7946 for "control plane" gossip discovery communication between all nodes
UDP port 4789 for "data plane" VXLAN overlay network traffic
IP Protocol 50 (ESP) if you plan on using overlay network with the encryption option

	[unix_http_server]
	file=/tmp/supervisor.sock ; path to your socket file

	[supervisord]
	logfile=/var/log/supervisord/supervisord.log ; supervisord log file
	logfile_maxbytes=50MB ; maximum size of logfile before rotation
	logfile_backups=10 ; number of backed up logfiles
	loglevel=error ; info, debug, warn, trace
	pidfile=/var/run/supervisord.pid ; pidfile location
	nodaemon=false ; run supervisord as a daemon

	class Api::UploadsController < ApiController

	def create
	@upload = Upload.new(upload_params)
	ensure
	clean_tempfile
	end

	private

	#!/bin/bash

	### Command log to install Cuda Toolkit 6.5, driver 343.22, and ccminer.

	## Update the system
	sudo apt-get update && sudo apt-get -y dist-upgrade
	# All the dependencies for Cuda & ccminer (I think)
	sudo apt-get -y install gcc g++ build-essential automake linux-headers-$(uname -r) git gawk libcurl4-openssl-dev libjansson-dev xorg libc++-dev libgmp-dev python-dev

	# first:
	lsbom -f -l -s -pf /var/db/receipts/org.nodejs.pkg.bom \| while read f; do sudo rm /usr/local/${f}; done
	sudo rm -rf /usr/local/lib/node /usr/local/lib/node_modules /var/db/receipts/org.nodejs.*

	# To recap, the best way (I've found) to completely uninstall node + npm is to do the following:

	# go to /usr/local/lib and delete any node and node_modules
	cd /usr/local/lib
	sudo rm -rf node*