mikhailov

net.inet.tcp.sack=1
net.inet.tcp.rfc1323=1
net.inet.tcp.recvspace=1048576
net.inet.udp.recvspace=1048576
net.inet.tcp.sendspace=1048576
net.inet.tcp.mssdflt=1460
net.inet.tcp.win_scale_factor=8

mikhailov

module ActionDispatch
  class Reloader

    def call(env)
      if env['PATH_INFO'].include?(Rails.application.config.assets.prefix)
        @app.call(env)
      else
        @validated = @condition.call
        prepare!

mikhailov

#/bin/bash -e


RUBY_VERSION=2.0.0

if [ "$RUBY_VERSION" == '2.0.0' ]; then
  yum -y install ruby20 rubygems20 ruby-devel
  alternatives --set ruby /usr/bin/ruby2.0
elif [ "$RUBY_VERSION" == '1.9.3' ]; then
  yum -y install ruby19 rubygems19 ruby19-devel

mikhailov

# This the bash script to handle up-and-runnig VM created through Vagrant
#!/usr/bin/env bash


# PRIVATE: error level message
error_message () {
  echo "$(tput setaf 1)ERROR: $1$(tput sgr0)"
}

mikhailov

# standard capistrano config goes here....
# Put the maintenance screen if DB migrations take in place only

before "deploy",                 "deploy:delayed_job:stop"
before "deploy:migrations",      "deploy:delayed_job:stop"

after  "deploy:update_code",     "deploy:symlink_shared", "deploy:assets_compress"
before "deploy:migrate",         "deploy:web:disable",    "deploy:db:backup"

after  "deploy",                 "newrelic:notice_deployment", "deploy:cleanup", "deploy:delayed_job:restart"

mikhailov

echo 'events {
    worker_connections            1024;
}

error_log                         /usr/local/Cellar/nginx/1.5.8/error.log;

http {
  include                         mime.types;
  default_type                    application/octet-stream;
  sendfile                        on;

mikhailov

ActiveSupport::Notifications.subscribe('process_action.action_controller') do |*args|
  event   = ActiveSupport::Notifications::Event.new(*args)
  span    = Datadog.tracer.active_span
  payload = event.payload

  if span && payload.key?(:db_runtime)
    db_runtime = payload[:db_runtime].to_f.round(3)
    span.set_tag('database.sql_time', db_runtime)
  end
end

mikhailov

#!/bin/bash
set -ex

# Inject APM Trace ID (part of SQL query comment) to a Log event
# https://docs.datadoghq.com/tracing/advanced/connect_logs_and_traces/?tab=ruby
# Input: {"command": "Query", "current_statement": "SELECT ... /* 4572859165692197980 */"}
# Output: {"process_list": {"current_statement": "SELECT ... /* 4572859165692197980 */"}, "dd": {"trace_id": 4572859165692197980}}
function inject_trace_id() {
  trace_id=$(echo "$1" |grep -Eo '/\* [0-9]{16,20} \*/' | awk '{print $2}')

mikhailov

#!/bin/bash -e


curl -O http://ftp.heanet.ie/pub/centos/7.0.1406/isos/x86_64/CentOS-7.0-1406-x86_64-Minimal.iso
export VM="MASTER"
export VMDISK="$VM-disk"
export REDHAT_IMAGE="/Users/user/Downloads/CentOS-7.0-1406-x86_64-Minimal.iso"

VBoxManage hostonlyif create
VBoxManage hostonlyif ipconfig vboxnet0 --ip 192.168.20.1

mikhailov

- http://www.coffeepowered.net/2009/06/13/fine-tuning-your-garbage-collector/
- http://snaprails.tumblr.com/post/241746095/rubys-gc-configuration

  article’s settings:                                     ("spec spec" took 17-23!sec)
	export RUBY_HEAP_MIN_SLOTS=1250000
	export RUBY_HEAP_SLOTS_INCREMENT=100000
	export RUBY_HEAP_SLOTS_GROWTH_FACTOR=1
	export RUBY_GC_MALLOC_LIMIT=30000000
	export RUBY_HEAP_FREE_MIN=12500