bmarini

mkdir ~/tmp_mongo_data1
mkdir ~/tmp_mongo_data2
mkdir ~/tmp_mongo_data3

# In separate terminals
mongod --dbpath ~/tmp_mongo_data1 --port 5000 --replSet ben
mongod --dbpath ~/tmp_mongo_data2 --port 5001 --replSet ben
mongod --dbpath ~/tmp_mongo_data3 --port 5002 --replSet ben

# Then setup replication in a 4th terminal

bmarini

# https://www.varnish-cache.org/docs/2.1/tutorial/vcl.html
# https://www.varnish-cache.org/trac/wiki/VCLExamples

# Summary
# 1. Varnish will poll the backend at /health_check to make sure it is
#    healthy. If the backend goes down, varnish will server stale content
#    from the cache for up to 1 hour.
# 2. Varnish will pass X-Forwarded-For headers through to the backend
# 3. Varnish will remove cookies from urls that match static content file
#    extensions (jpg, gif, ...)

bmarini

require 'ruby-prof'
# RubyProf.measure_mode = RubyProf::PROCESS_TIME
# RubyProf.measure_mode = RubyProf::WALL_TIME
# RubyProf.measure_mode = RubyProf::CPU_TIME
# RubyProf.measure_mode = RubyProf::ALLOCATIONS
# RubyProf.measure_mode = RubyProf::MEMORY
# RubyProf.measure_mode = RubyProf::GC_RUNS
# RubyProf.measure_mode = RubyProf::GC_TIME

result = RubyProf.profile do

bmarini

# Start a job from an SSH session that will continue to run after logging out
nohup ./myprogram > foo.out 2> foo.err < /dev/null &

# Clear memcached
echo flush_all | nc localhost 11211

bmarini

# Making a large class modular
# * Put core functionality into Base module inside your class
# * Split other functionality into modules and include them at the bottom of the
#   your class
# * Now it is easy to reuse or recreate custom versions of the class by creating
#   new classes, including only some modules, swapping modules out for others, etc.
class MainClass
  module Base
    attr_accessor :name
    def initialize(name)

bmarini

require 'rubygems'
require 'active_record'
ActiveRecord::Base.establish_connection :adapter => "sqlite3", :database => ":memory:"

ActiveRecord::Schema.define do
  create_table :authors do |t|
    t.string :name, :null => false
  end

  add_index :authors, :name, :unique

bmarini

# set PATH so it includes user's private bin if it exists
if [ -d "$HOME/bin" ] ; then
    PATH="$HOME/bin:$PATH"
fi

# rbenv support
if which rbenv > /dev/null; then eval "$(rbenv init -)"; fi

# If not running interactively, don't do anything
[ -z "$PS1" ] && return

bmarini

module Rack
  # Renders a valid robots.txt according to http://www.robotstxt.org
  # This is an example of over-engineering. But it's simple example of
  # how you might test your middleware.
  class RobotsTxt
    def initialize(app)
      @app = app
    end

    def call(env)

bmarini

#!/bin/bash
# a quick and dirty backup script.
# if you have a websites folder and some databases to backup
# this script might be a good starting point.
# this script assumes you have user named admin.

BASE_DIR='/'
TARGET_DIR='sites'
BACKUP_TIME=`date +%Y%m%d%H%I%S`
BACKUP_FILENAME="${BACKUP_TIME}-${TARGET_DIR}"