nathany

# add something like this to config.ru
# see https://github.com/kzk/unicorn-worker-killer

if Integer(ENV['UNICORN_KILLER'] || 0) != 0
  require 'unicorn/worker_killer'
  # Max memory size (RSS) per worker
  use Unicorn::WorkerKiller::Oom, (350*(1024**2)), (400*(1024**2)), 30, true
end

kigster

max_connections = 1500                  # (change requires restart)
shared_buffers = 12000MB                # min 128kB, based on 80GB RAM DB 
temp_buffers = 8MB                      # min 800kB
work_mem = 64MB                         # min 64kB
maintenance_work_mem = 1500MB           # min 1MB

wal_level = hot_standby                 # minimal, archive, or hot_standby
checkpoint_segments = 256               # in logfile segments, min 1, 16MB each
checkpoint_completion_target = 0.9      # checkpoint target duration, 0.0 - 1.0
max_wal_senders = 6                     # max number of walsender processes

czarneckid

Zero downtime deploys with unicorn + nginx + runit + rvm + chef

Below are the actual files we use in one of our latest production applications at Agora Games to achieve zero downtime deploys with unicorn. You've probably already read the GitHub blog post on Unicorn and would like to try zero downtime deploys for your application. I hope these files and notes help. I am happy to update these files or these notes if there are comments/questions. YMMV (of course).

Other application notes:

• Our application uses MongoDB, so we don't have database migrations to worry about as with MySQL or postgresql. That does not mean that we won't have to worry about issues with the database with indexes being built in MongoDB or what have you.
• We use capistrano for deployment.

Salient points for each file:

mikhailov

# Nginx+Unicorn best-practices congifuration guide. Heartbleed fixed.
# We use latest stable nginx with fresh **openssl**, **zlib** and **pcre** dependencies.
# Some extra handy modules to use: --with-http_stub_status_module --with-http_gzip_static_module
#
# Deployment structure
#
# SERVER:
#  /etc/init.d/nginx                             (1. nginx)
#  /home/app/public_html/app_production/current  (Capistrano directory)
#

andreyvit

tmux cheat sheet

(C-x means ctrl+x, M-x means alt+x)

Prefix key

The default prefix is C-b. If you (or your muscle memory) prefer C-a, you need to add this to ~/.tmux.conf:

remap prefix to Control + a

jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

kmatt

# dump
pg_dump testdb | pv -c -s $(psql -tc "SELECT pg_database_size('testdb')") -N dump | gzip > testdb.sql.gz

# restore
pv testdb_20120501.sql.gz | zcat | psql testdb

panthomakos

#!/usr/bin/env ruby

require 'benchmark'

REGEXPS = [
  /^no such file to load -- (.+)$/i,
  /^Missing \w+ (?:file\s*)?([^\s]+.rb)$/i,
  /^Missing API definition file in (.+)$/i,
  /^cannot load such file -- (.+)$/i,
]

paulchubatyy

#!/bin/sh
# PHP CodeSniffer pre-receive hook for git

PHPCS_BIN="/usr/bin/phpcs"
PHPCS_CODING_STANDARD="PEAR"
# use coding standart dir from local repo
PHPCS_DIR_LOCAL=0

TMP_DIR=$(mktemp -d --tmpdir phpcs-pre-receive-hook.XXXXXXXX)
mkdir "$TMP_DIR/source"

bobuk

# -*- coding: utf-8 -*-

import sys;reload(sys);sys.setdefaultencoding('utf-8')
import twitter
import time
import commands, itertools

consumer_key    = ...
consumer_secret = ...
access_key = ...