Eugene j3ck

Finding a Ruby memory leak using a time analysis

When developing a program in Ruby, you may sometimes encounter a memory leak. For a while now, Ruby has a facility to gather information about what objects are laying around: ObjectSpace.

There are several approaches one can take to debug a leak. This discusses a time-based approach, where a full memory dump is generated every, say, 5 minutes, during a time that the memory leak is showing up. Afterwards, one can look at all the objects, and find out which ones are staying around, causing the

Running redis using upstart on Ubuntu

I've been trying to understand how to setup systems from the ground up on Ubuntu. I just installed redis onto the box and here's how I did it and some things to look out for.

To install:

	# This will move all images and other Dragonfly assets from your local server file system to Amazon S3.

	namespace :dragonfly do
	task :migrate_to_s3 => :environment do
	# Adjust this line to meet your needs:
	{ Product => [:image_uid, :other_uid], Page => :image_uid }.each do \|klass, col\|
	puts "Migrating #{klass.table_name}..."
	Array(col).each do \|col\|
	klass.where("#{col} != ''").find_each do \|instance\|
	begin

	# read more at https://terrty.net/2014/ssl-tls-in-nginx/
	# latest version on https://gist.github.com/paskal/628882bee1948ef126dd/126e4d1daeb5244aacbbd847c5247c2e293f6adf
	# security test score: https://www.ssllabs.com/ssltest/analyze.html?d=terrty.net
	# your nginx version might not have all directives included, test this configuration before using in production against your nginx:
	# $ nginx -c /etc/nginx/nginx.conf -t

	server {
	# public key, contains your public key and class 1 certificate, to create:
	# (example for startssl)
	# $ (cat example.com.pem & wget -O - https://www.startssl.com/certs/class1/sha2/pem/sub.class1.server.sha2.ca.pem) \| tee -a /etc/nginx/ssl/domain.pem > /dev/null

	Your name and email address were configured automatically based
	on your username and hostname. Please check that they are accurate.
	You can suppress this message by setting them explicitly:

	git config --global user.name "Your Name"
	git config --global user.email [email protected]

	After doing this, you may fix the identity used for this commit with:

	git commit --amend --reset-author

	# to generate your dhparam.pem file, run in the terminal
	openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048