yzdann

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

yzdann

• Intro
  • Problem
  • Solution
• Setup
  • A server
  • A client
  • compile_commands.json file generation
• Linting
• Code formatting

yzdann

git diff -p \
    | grep -E '^(diff|old mode|new mode)' \
    | sed -e 's/^old/NEW/;s/^new/old/;s/^NEW/new/' \
    | git apply

yzdann

# Redis Cheatsheet
# All the commands you need to know


redis-server /path/redis.conf  # start redis with the related configuration file
redis-cli                      # opens a redis prompt


# Strings.

yzdann

...

action_with_slack_notification = %(banaction)s[name=%(__name__)s, port="%(port)$
                                 slack[name=%(__name__)s]
                                 
action = %(action_with_slack_notification)s

...

yzdann

---
- hosts: all

  vars:
    UBUNTU_COMMON_ROOT_PASSWORD: 'xxxxx'
    UBUNTU_COMMON_DEPLOY_PASSWORD: 'xxxxx'
    UBUNTU_COMMON_LOGWATCH_EMAIL: [email protected]
    ubuntu_common_deploy_user_name: deploy
    ubuntu_common_deploy_public_keys:
      - ~/.ssh/id_rsa.pub

yzdann

#!/bin/bash
#
# Author: Patrick Bailey
# License: MIT
#
# Set the percentage of 200, 404, and 500 errors you want
# Set the hourly rate you want
# Set a URL for 200, 404 and 500
#
# Then run it.  it will suffle the 200, 404, and 500 urls

yzdann

##TCP FLAGS##

Unskilled Attackers Pester Real Security Folks
==============================================
                     TCPDUMP FLAGS
Unskilled =  URG  =  (Not Displayed in Flag Field, Displayed elsewhere) 
Attackers =  ACK  =  (Not Displayed in Flag Field, Displayed elsewhere)
Pester    =  PSH  =  [P] (Push Data)
Real      =  RST  =  [R] (Reset Connection)
Security  =  SYN  =  [S] (Start Connection)

yzdann

Project Title

One Paragraph of project description goes here

Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. See deployment for notes on how to deploy the project on a live system.

Prerequisites

yzdann

jq cheatsheet

Extract field from list of objects

jq 'map(.foo)'

[ { foo: 1 }, { foo: 2 } ]
[1, 2]