\documentclass[10pt,a4paper]{article}

% Packages
\usepackage{fancyhdr}           % For header and footer
\usepackage{multicol}           % Allows multicols in tables
\usepackage{tabularx}           % Intelligent column widths
\usepackage{tabulary}           % Used in header and footer
\usepackage{hhline}             % Border under tables
\usepackage{graphicx}           % For images
\usepackage{xcolor}             % For hex colours
%\usepackage[utf8x]{inputenc}    % For unicode character support
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\usepackage{colortbl}           % For coloured tables
\usepackage{setspace}           % For line height
\usepackage{lastpage}           % Needed for total page number
\usepackage{seqsplit}           % Splits long words.
%\usepackage{opensans}          % Can't make this work so far. Shame. Would be lovely.
\usepackage[normalem]{ulem}     % For underlining links
% Most of the following are not required for the majority
% of cheat sheets but are needed for some symbol support.
\usepackage{amsmath}            % Symbols
\usepackage{MnSymbol}           % Symbols
\usepackage{wasysym}            % Symbols
%\usepackage[english,german,french,spanish,italian]{babel}              % Languages

% Document Info
\author{aodan}
\pdfinfo{
  /Title (destructive-testing.pdf)
  /Creator (Cheatography)
  /Author (aodan)
  /Subject (Destructive Testing Cheat Sheet)
}

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\renewcommand{\seqinsert}{\ifmmode\allowbreak\else\-\fi} % Hyphens in seqsplit
% This two commands together give roughly
% the right line height in the tables
\renewcommand{\arraystretch}{1.3}
\onehalfspacing

% Commands
\newcommand{\SetRowColor}[1]{\noalign{\gdef\RowColorName{#1}}\rowcolor{\RowColorName}} % Shortcut for row colour
\newcommand{\mymulticolumn}[3]{\multicolumn{#1}{>{\columncolor{\RowColorName}}#2}{#3}} % For coloured multi-cols
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\newcommand{\tn}{\tabularnewline} % Required as custom column type in use

% Font and Colours
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\renewcommand{\familydefault}{\sfdefault}
\color{TextColor}

% Header and Footer
\pagestyle{fancy}
\fancyhead{} % Set header to blank
\fancyfoot{} % Set footer to blank
\fancyhead[L]{
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{C}
    \SetRowColor{DarkBackground}
    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
    }
\end{tabulary}
\columnbreak
\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{Destructive Testing Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{aodan} via \textcolor{DarkBackground}{\uline{cheatography.com/83513/cs/19785/}}}
\end{tabulary}
\end{multicols}}

\fancyfoot[L]{ \footnotesize
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
  \SetRowColor{FootBackground}
  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}aodan \\
  \uline{cheatography.com/aodan} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Not Yet Published.\\
   Updated 18th June, 2019.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
  \SetRowColor{white}
  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
\end{tabulary}
\end{multicols}}




\begin{document}
\raggedright
\raggedcolumns

% Set font size to small. Switch to any value
% from this page to resize cheat sheet text:
% www.emerson.emory.edu/services/latex/latex_169.html
\footnotesize % Small font.


\begin{tabularx}{17.67cm}{x{8.635 cm} x{8.635 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{17.67cm}}{\bf\textcolor{white}{Outbound Network Traffic on eth0}}  \tn
% Row 0
\SetRowColor{LightBackground}
Tools & netem, tc, qdisc, iptables \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
Add delay 1000+-10ms to all packets to box 10.0.0.2 & \#tc qdisc add dev eth0 root handle 1: prio\{\{nl\}\}\#tc qdisc add dev eth0 parent 1:3 handle 30: netem delay 1000ms 10ms distribution normal\{\{nl\}\}\#tc filter add dev eth0 protocol ip parent 1:0 prio 3 u32 match ip dst 10.0.0.2/32 flowid 1:3 \tn 
% Row Count 14 (+ 12)
% Row 2
\SetRowColor{LightBackground}
Use netem to emulate loss, duplication and corruption & \#tc qdisc change dev eth0 handle 30: netem loss 0.1\%\{\{nl\}\}\#tc qdisc change dev eth0 handle 30: netem duplicate 1\%\{\{nl\}\}\#tc qdisc change dev eth0 handle 30: netem corrupt 0.1\% \tn 
% Row Count 23 (+ 9)
% Row 3
\SetRowColor{white}
Cleanup & \#tc qdisc del dev eth0 root \tn 
% Row Count 25 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{17.67cm}}{All commands should be run as root}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{8.635 cm} x{8.635 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{17.67cm}}{\bf\textcolor{white}{Inbound Network Traffic on eth0}}  \tn
% Row 0
\SetRowColor{LightBackground}
Tools & netem, tc, qdisc, iptables \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
Notes: & To use netem on incoming traffic we have to use ifb (intermediate functional block pseudo-device). This network device allows attaching queuing discplines to incoming packets. \tn 
% Row Count 11 (+ 9)
% Row 2
\SetRowColor{LightBackground}
To load and brinnig up ifb module & \#modprobe ifb\{\{nl\}\}\#ip link set dev ifb0 up \tn 
% Row Count 14 (+ 3)
% Row 3
\SetRowColor{white}
Add delay 1000+-10ms to all packets from box 10.0.0.2 & \#tc qdisc add dev eth0 ingress\{\{nl\}\}\#tc filter add dev eth0 parent ffff: protocol ip u32 match ip src 10.0.0.2/32 flowid 1:1 action mirred egress redirect dev ifb0\{\{nl\}\}\#tc qdisc add dev ifb0 root netem delay 1000ms \tn 
% Row Count 25 (+ 11)
% Row 4
\SetRowColor{LightBackground}
Use netem to emulate loss, duplication and corruption & \#tc qdisc change dev ifb0 root netem loss 0.1\%\{\{nl\}\}\#tc qdisc change dev ifb0 root netem duplicate 1\%\{\{nl\}\}\#tc qdisc change dev ifb0 root netem corrupt 0.1\% \tn 
% Row Count 33 (+ 8)
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{8.635 cm} x{8.635 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{17.67cm}}{\bf\textcolor{white}{Inbound Network Traffic on eth0 (cont)}}  \tn
% Row 5
\SetRowColor{LightBackground}
Cleanup & \#tc qdisc del dev eth0 ingress\{\{nl\}\}\#tc qdisc del dev ifb0 root \tn 
% Row Count 4 (+ 4)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{17.67cm}}{All commands should be run as root}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{7.0807 cm} x{10.1893 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{17.67cm}}{\bf\textcolor{white}{Simulate Network Cable pull}}  \tn
% Row 0
\SetRowColor{LightBackground}
Block all traffic except SSH & \#iptables -A INPUT -i lo -j ACCEPT\{\{nl\}\}\#iptables -A INPUT -p tcp -m tcp -{}-dport 22 -j ACCEPT\{\{nl\}\}\#iptables -A OUTPUT -o lo -j ACCEPT\{\{nl\}\}\#iptables -A OUTPUT -p tcp -{}-sport 22 -m state -{}-state ESTABLISHED -j ACCEPT\{\{nl\}\}\#iptables -P INPUT DROP\{\{nl\}\}\#iptables -P OUTPUT DROP \tn 
% Row Count 12 (+ 12)
% Row 1
\SetRowColor{white}
Cleanup/Flush all rules & \#iptables -F \tn 
% Row Count 14 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{17.67cm}}{All commands should be run as root in right order \newline It is better to place in script}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{17.67cm}}{\bf\textcolor{white}{Python Script to use X MB of memory on Server}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{17.67cm}}{\#!/usr/bin/env python \newline  \newline import sys \newline import time \newline  \newline if len(sys.argv) != 2: \newline     print "usage: fillmem \textless{}number-of-megabytes\textgreater{}" \newline     sys.exit() \newline  \newline count = int(sys.argv{[}1{]}) \newline  \newline megabyte = (0,) {\emph{ (1024 }} 1024 / 8) \newline  \newline data = megabyte * count \newline  \newline while True: \newline     time.sleep(1)} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{17.67cm}}{Credit swiftcoder on stackexchange}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{7.7715 cm} x{9.4985 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{17.67cm}}{\bf\textcolor{white}{Fill up disk space on server}}  \tn
% Row 0
\SetRowColor{LightBackground}
dd - non readable - 1GB file & \#dd if=/dev/zero of=file.txt count=1024 bs=1048576 \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
dd - random - readable - 1GB file & \#dd if=/dev/urandom of=file.txt bs=1048576 count=1024 \tn 
% Row Count 6 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{8.635 cm} x{8.635 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{17.67cm}}{\bf\textcolor{white}{stress}}  \tn
% Row 0
\SetRowColor{LightBackground}
Use 1GB of Memory for 1 hour & stress -{}-vm 2 -{}-vm-bytes 1024M -{}-vm-hang 3600 \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
Use 4 CPUs calculating sqrt of randint for 1 hour & stress -{}-cpu 4  -{}-timeout 3600 \tn 
% Row Count 6 (+ 3)
% Row 2
\SetRowColor{LightBackground}
Stress IO & stress -{}-io 4 \tn 
% Row Count 7 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{17.67cm}}{more info: \seqsplit{https://linux.die.net/man/1/stress} \newline  \newline Commands can be combined}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}



\end{document}