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Scale 19x openwrt talk slides
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‎openwrt-at-scale/Makefile‎

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default: slides.pdf
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slides.pdf: slides.tex
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rubber --pdf slides.tex
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view: slides.pdf
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atril slides.pdf

‎openwrt-at-scale/default.nix‎

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let
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pkgs = import <nixpkgs> {};
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# https://ctan.org/ for what to combine in texlive
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texlive = pkgs.texlive.combine {
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inherit (pkgs.texlive)
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scheme-small
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beamer
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# Theme reqs
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beamertheme-metropolis
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pgfopts
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multirow
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;
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};
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in {

‎openwrt-at-scale/slides.tex‎

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\documentclass{beamer}
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\usetheme[progressbar=frametitle]{metropolis}
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%\setbeamertemplate{frame numbering}[fraction]
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\useoutertheme{metropolis}
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\useinnertheme{metropolis}
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\usefonttheme{metropolis}
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\usecolortheme{spruce}
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\setbeamercolor{background canvas}{bg=white}
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\usepackage{listings}
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% storing our images
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\usepackage{graphicx}
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\graphicspath{{./images/}}
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%Information to be included in the title page:
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\title{Building SCaLE's OpenWrt Conference WiFi}
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\subtitle{Yes...The very network you're connected to right now}
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\author{
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Robert Hernandez \\
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CTO @ Nebulaworks \\
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@sarcasticadmin
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}
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\date{July 2022}
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\setbeameroption{hide notes} % Only slides
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%\setbeameroption{show only notes} % Only notes
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%\setbeameroption{show notes on second screen=right} % Both
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%\setbeamertemplate{note page}{\pagecolor{yellow!5}\insertnote}\usepackage{palatino}
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\begin{document}
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\metroset{block=fill}
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\frame{\titlepage}
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\begin{frame}
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\frametitle{Tech Team}
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%{\large \textbf{SCaLE Tech Team}}
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\begin{center}
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\includegraphics[scale=.5]{scale-tech}
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\end{center}
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\note[item]{SCaLE is run by many volunteers and traditionally the scale-network team provides this service}
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\note[item]{Our tech team is made up by 10 dedicated team members who have been dedicated to the conference for many years}
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\end{frame}
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\begin{frame}
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\frametitle{Why}
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\begin{center}
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{\large \textbf{Conference attendees need WiFi} \\[20pt]}
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\includegraphics[scale=.5]{wifi-signage}
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\end{center}
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\note[item]{And countless options to choose from: many propertary and only a few open}
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\note[item]{SCaLE is run by many volunteers and traditionally the scale-network team provides this service}
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\end{frame}
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\begin{frame}
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\frametitle{History}
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% Alert to highlight each part of the timeline
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\begin{itemize}[<alert@+>]
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% TODO: What about prior years?
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\item Jan 2017 - "Does anyone know how to build OpenWrt?"
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\note[item]{During one of my first conference calls on the tech team prior to SCaLE 15x in Jan 2017}
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\note[item]{Previous Tech Team was no more and everyone was new for the coming year}
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\note[item]{Bare minimum for SCaLE 15x but config was kept}
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\onslide<2->{
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\item March 2017 - SCaLE 15x
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}
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\onslide<3->{
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\item Sept 2017 - Decision to stick with OpenWrt
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}
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\onslide<4->{
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\item July 2022 - SCaLE 19x
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}
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\end{itemize}
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\note[item]{This led to 5 years of iteration by the entire Tech Team}
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\note[item]{Many of the things Ill be covering were built out of necessity and in an effort to provide a reliable network come show time}
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\end{frame}
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% TODO: Where to put "how" might need to be before history
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\begin{frame}
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\frametitle{Hardware}
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\begin{center}
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{\large \textbf{ \textasciitilde 120 consumer "routers"} \\[20pt]}
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\small{
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\begin{tabular}{| l | l | l | l | l |}
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\hline
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Model & WiFi Chipsets & 2.4 GHz & 5 GHz & RAM \\ \hline
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Netgear 3700v2 & Ath AR9220 + AR9223 & b/g/n & a/n & 64MB \\ \hline
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Netgear 3800[CH] & Ath AR9220 + AR9223 & b/g/n & a/n & 64MB \\ \hline
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\end{tabular} \\[20pt]
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}
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\includegraphics[scale=.3]{wndr3700_v2}
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\end{center}
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\note[item]{Netgear 3700v2 and 3800 series}
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\note[item]{We do have support the TPlink C2600 but wireless driver support has been unreliable of the past couple of years}
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\end{frame}
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\begin{frame}
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\frametitle{Repo}
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\begin{center}
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{\large \textbf{https://github.com/socallinuxexpo/scale-network}}
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\end{center}
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\note[item]{SCaLE techs single source of truth for all deployments}
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\end{frame}
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\begin{frame}
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\frametitle{Build}
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{\large \textbf{SCaLE's OpenWrt image}} \\[20pt]
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\begin{block}{16MB max}
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Kernel: Linux 5.10.89 2022 mips GNU/Linux \\
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Pkgs: Bash, Python, OpenSSH, lldp, tcpdump, rsyslog, apinger, zabbix \\
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Files: Openwrt Configs, ssh keys, etc.
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\end{block}
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Removed: luci, dropbear, dnsmasq, logd \\[20pt]
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\note[item]{openwrt is built of snapshots of upstream master for both kernel and packages}
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\note[item]{periodically bumped throughout the year}
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\note[item]{limited to 16MB on netgears}
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\note[item]{unnecessary packages and defaults are stripped out [luci, nat, etc.]}
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\note[item]{Bash, Python, OpenSSH, tcpdump, zabbix, rsyslog installed via opkg at image build time}
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\note[item]{mixin config files via templating process}
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\end{frame}
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% TODO: How to convey the image of massflash
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\begin{frame}
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\frametitle{Flash}
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\only<1>{\line(1,0){50}}
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\only<2>{\textcolor{red}{Traditional}}
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\note[item]{manual setup, paperclip and detection of flash process}
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\only<3>{
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\begin{center}
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\includegraphics[scale=.25]{wifi-hard-reset}
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\end{center}
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}
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\only<4>{\textcolor{orange}{Solo}}
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\note[item]{expect script that waits for signals from AP that its in the proper mode}
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\only<5>{
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\textcolor{green}{Mass}
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}
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\only<9>{\textcolor{green}{Autoflash}}
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\note[item]{Tease this and mention that well discuss this last option later when we discuss testing}
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\only<1,2,4,5,9>{OpenWrt Flash}
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\only<6>{
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\begin{center}
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\includegraphics[scale=.25]{massflash-1}
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\end{center}
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}
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\only<7>{
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\begin{center}
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\includegraphics[scale=.25]{massflash-2}
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\end{center}
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}
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\only<8>{
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\begin{center}
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\includegraphics[scale=.25]{massflash-3}
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\end{center}
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}
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\note[item]{Requires openwrt and SSH access to the hardware}
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\note[item]{Via DHCP lease event then SCP and trigger reflash of hardware}
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\note[item]{Reflash fleet of 100 APs in 2 hours}
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\note[item]{Limited by switch ports and power strips}
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\note[item]{Consistent, prior we often werent sure if image was flashed}
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\end{frame}
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\begin{frame}
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\frametitle{Management}
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{\large \textbf{SCaLE's OpenWrt management} \\[20pt]}
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\begin{itemize}
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\item Custom DHCP options: WiFi Channels and Network Config
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\item Re-flash APs for any major system updates
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\item SSH
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\item Rsyslog and zabbix for observability
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\end{itemize}
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\note[item]{Leverage custom DHCP options and scripts local to the AP}
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\note[item]{Network trunks and bridges are configured to accomediate all SCaLE needs (N buildins, etc.)}
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\note[item]{WiFi Channel info, network config provided via DHCP options}
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\note[item]{Anything adhoc is dealt with via SSH}
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\note[item]{Reflash APs for any major changes to configuration}
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\note[item]{mixin config files}
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\end{frame}
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\begin{frame}[label=foo]
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\frametitle{Automated Testing}
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\only<1>{
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{\large \textbf{Golden Tests}} \\[20pt]
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\lstinputlisting[language=bash]{snippets/golden.sh}
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}
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\only<2-4>{
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{\large \textbf{Weekly Image Build}} \\[20pt]
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}
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\only<3>{
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\includegraphics[scale=.1]{build-weekly-2}
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}
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\only<4>{
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\includegraphics[scale=.1]{build-weekly-1}
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}
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\note[item]{Ensure that existing upstream sources still build correctly}
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%\item<1,2>
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%\note[item]{Check templated configuration against expected outputs in our CI}
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\only<5>{
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{\large \textbf{Serverspec}} \\[20pt]
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\lstinputlisting[language=ruby]{snippets/serverspec.rb}
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}
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\only<6>{
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{\large \textbf{Autoflash}} \\[20pt]
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}
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\only<7>{
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{\large \textbf{Autoflash}} \\[20pt]
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\begin{block}{Configuration}
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\small
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Hardware: Raspberry Pi 4, Relay, USB Ethernet Adapter, AP Board \\
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Software: FreeBSD 13, GitLab runner, magic wormhole, and expect
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\end{block}
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}
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\only<8>{
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\includegraphics[scale=.05]{autoflash-1}
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}
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\only<9>{
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\includegraphics[scale=.05]{autoflash-2}
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}
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\only<10>{
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\includegraphics[scale=.05]{autoflash-3}
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}
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\end{frame}
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\begin{frame}
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\frametitle{Radio Testing}
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\begin{enumerate}
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\item iperf
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\item Dogfooding
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\item Surveying
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\note[item]{WiFi driver performance and stability is tested by contributors dogfooding the configuration throghout the year}
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\end{enumerate}
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\end{frame}
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\begin{frame}
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\frametitle{Impact}
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\begin{itemize}
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\item Stable platform for the conference
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\item Saves an entire day during show prep
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\item Autoflash decreased feedback loops from 20+min to 5 min per test
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\item 52 serverspec tests being checked on all images
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\item Enables expanding AP hardware to support more than 1 model with limited overhead
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\end{itemize}
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\note[item]{}
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\end{frame}
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\begin{frame}
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\frametitle{Errata @ 19x}
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\begin{itemize}
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\item WiFi radios remaining up if initial boot had no connectivity
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\item DHCP reservations mismatches and range overlap
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\item DNS ACL assumptions for Pasadena Convention Center
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\end{itemize}
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\note[item]{}
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\end{frame}
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\begin{frame}
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\frametitle{Future}
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\begin{itemize}
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\item Belkin RT3200: WiFi 6
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\item DAWN: https://github.com/berlin-open-wireless-lab/DAWN
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\item Automated client WiFi testing in CI
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\item Advanced surveying process
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\end{itemize}
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\note[item]{DAWN works best with networks where AP and devices have 802.11k capabilities for discovering the quality of radio signals, plus 802.11v for requesting devices to move to a different AP.}
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\end{frame}
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\begin{frame}
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\frametitle{Repo}
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\begin{center}
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{\large \textbf{https://github.com/socallinuxexpo/scale-network}}
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\end{center}
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\note[item]{SCaLE techs single source of truth for all deployments}
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\end{frame}
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\begin{frame}
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\frametitle{This talk}
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\begin{center}
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{\large \textbf{https://github.com/sarcasticadmin/talks}}
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\end{center}
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\end{frame}
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\begin{frame}
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\frametitle{End}
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\begin{center}
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{\large \textbf{Thank you}}
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\end{center}
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\end{frame}
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\end{document}

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