henrik

tmux cheatsheet

As configured in my dotfiles.

start new:

tmux

start new with session name:

troy

# replace PAPERTRAIL_HOSTNAME and PAPERTRAIL_PORT
# see http://help.papertrailapp.com/ for additional PHP syslog options

function send_remote_syslog($message, $component = "web", $program = "next_big_thing") {
  $sock = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
  foreach(explode("\n", $message) as $line) {
    $syslog_message = "<22>" . date('M d H:i:s ') . $program . ' ' . $component . ': ' . $line;
    socket_sendto($sock, $syslog_message, strlen($syslog_message), 0, PAPERTRAIL_HOSTNAME, PAPERTRAIL_PORT);
  }
  socket_close($sock);

hellerbarde

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

willurd

Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000

dideler

Note: I'm currently taking a break from this course to focus on my studies so I can finally graduate

Table of Contents

1. Overview
2. Introduction
3. Interactive Start
4. Linux and Server-Side Javascript
5. Linux Command Line
6. Linux Development Environment

ragingwind

Backend Architectures

Twitter

ror, scala, jetty, erlang, thrift, mongrel, comet server, my-sql, memchached, varnish, kestrel(mq), starling, gizzard, cassandra, hadoop, vertica, munin, nagios, awstats

• Introduce Gizzard of Twitter - 트위터의 새로운 분산 관리 라이브러리 Gizzard를 소개합니다.
• The Architecture Twitter Uses to Deal with 150M Active Users, 300K QPS, a 22 MB/S Firehose, and Send Tweets in Under 5 Seconds
• Scaling Twitter: Making Twitter 10000 Percent Faster

raelgc

Setup a Local Only SMTP Email Server (Linux, Unix, Mac)

1 - Point localhost.com to your machine

Most of programs will not accept an email using just @localhost as domain. So, edit /etc/hosts file to make the domain localhost.com point to your machine, including this content to the file:

127.0.0.1 localhost.com

2 - Install Postfix

soarez

How to setup your own CA with OpenSSL

For educational reasons I've decided to create my own CA. Here is what I learned.

First things first

Lets get some context first.

stvnwlsn

Install and setup transmission daemon

$ cd /usr/ports/net-p2p/transmission-daemon
$ sudo make install
$ sudo mkdir /srv/torrents/{autoload,data}
$ sudo chown -R transmission:transmission /srv/torrents/
$ sudo chmod -R go+w /srv/torrents/
$ sudo vim /etc/rc.conf

taktran

Commands for controlling the Raspberry Pi 2 LEDs.

See rpi-leds for a node module that does this.

Power (PWR) LED

• OK (ACT) LED = led0
• Power (PWR) LED = led1

Allow access