[Seminaires][2019-2020] Présentation réseau et services

Seminaires/2019-2020/Presentation_technique/Presentation_Technique.tex

+\documentclass[pdf]{beamer}
+\usepackage[utf8]{inputenc}
+\usepackage[T1]{fontenc}
+\usepackage[french]{babel}
+\usepackage{graphicx}
+\usepackage{pstricks}
+\usepackage{tikz}
+\usepackage{alltt}
+
+\usepackage{pdfpages}
+
+\usetheme{Madrid}
+\usecolortheme{beaver}
+\setbeamertemplate{navigation symbols}{}
+
+\usepackage{palatino}
+\setbeamercovered{transparent}
+\useoutertheme[subsection=false,footline=authortitle]{miniframes}
+\setbeamertemplate{frametitle}[default][center]
+
+\newif\ifplacelogo
+\logo{\ifplacelogo\includegraphics[width=2cm]{../images/logo-coeur_black.png}\fi}
+
+\setcounter{tocdepth}{1}
+
+
+\AtBeginSection[]
+{
+  \setcounter{tocdepth}{2}
+  \begin{frame}
+    \frametitle{Sommaire}
+    \small
+    \tableofcontents[currentsection,hideothersubsections]
+    \normalsize
+  \end{frame}
+}
+
+
+\title[Présentation Cr@ns]{Présentation du réseau et des services Crans}
+\author[Pollion]{Maxime Bombar\footnote{Inspiré de la présentation de Daniel Stan du 06/10/2015}}
+\date{23 Septembre 2019}
+
+\begin{document}
+
+\placelogotrue
+
+\begin{frame}
+\maketitle
+\end{frame}
+
+\begin{frame}
+  \frametitle{Avant de commencer}
+  Si vous êtes apprentis et que vous vous ennuyez ...
+
+
+  \begin{alertblock}{  Sauriez-vous identifier le rôle de tous les serveurs ?}
+    bombar@thot \$ whos name=crans --serveur
+  \end{alertblock}
+\end{frame}
+
+
+\section*{Le réseau}
+
+\placelogofalse % Disable logo
+
+\begin{frame}
+  \frametitle{Plan du réseau}
+  \includegraphics[width=12cm]{../images/PlansDuReseau.jpg}
+\end{frame}
+
+\placelogotrue
+
+\begin{frame}
+  \frametitle{Présentation générale}
+  \begin{itemize}
+  \item Une dizaine de locaux techniques, répartis dans chaque bâtiment.
+  \item Coeur de réseau situé au bâtiment B.
+  \item Câbles RJ45 vers chaque chambre pour le filaire.
+  \item Fibre (gigabit) entre les bâtiments.
+  \item Fibre entre Zayo et nous (max 10GB).
+  \item Fibre entre l'ENS et nous.
+  \end{itemize}
+\end{frame}
+
+\begin{frame}
+  \frametitle{Du matériel}
+  \begin{figure}
+    \begin{minipage}[c]{.46\linewidth}
+      \includegraphics[width=4cm]{../images/UAP_AC_PRO.jpg}
+      \caption{158 Bornes wifi (2.4GHz sur Cr@ns, 5GHz sur Cr@ns-5g)}
+    \end{minipage}\hfill
+    \begin{minipage}[c]{.46\linewidth}
+      \includegraphics[width=4cm]{../images/switch.jpg}
+      \caption{56 Switches : bat\$x-\$n}
+  \end{minipage}
+  \end{figure}
+\end{frame}
+
+\begin{frame}
+  \frametitle{Du matériel}
+  \begin{itemize}
+  \item Des serveurs physiques
+  \item Des serveurs virtuels
+  \item 4 caméras
+  \item Une baie de disque.
+  \item Des onduleurs.
+  \end{itemize}
+\end{frame}
+
+\begin{frame}
+  \frametitle{Une pléthore de réseaux virtuels (VLAN)}
+  \begin{itemize}
+  \item Adm --> 2
+  \item Bornes --> 3
+  \item Accueil --> 7
+  \item Événementiel --> 10
+  \item Filaire privé --> 21
+  \item Wifi --> 22
+  \item Filaire publique --> 23
+  \item $\dots$
+  \end{itemize}
+\end{frame}
+
+\begin{frame}
+  \frametitle{Pourquoi faire ?}
+  \begin{itemize}
+  \item Permet d'isoler les serveurs Crans, les adhérents etc
+  \item Transparent pour la machine connectée.
+  \item Certains VLANs sont propagés côté ENS (Gala, SDA, Install Party, autre ...)
+  \end{itemize}
+\end{frame}
+
+\begin{frame}
+  \frametitle{Des addresses IP}
+  \begin{itemize}[<+->]
+  \item 1024 Ip publiques : 185.230.76.0/22 = 185.230.76.0 --> 185.230.79.255
+  \item Pas suffisant pour tout le monde...
+  \item On fait du NAT (Network Address Translation).
+  \item Pas le problème en IPv6 : 2a0c:700::/32 ~ 1 mole.
+  \item (Des addresses IP legacy prêtées par l'ENS, pour les serveurs uniquement :
+    138.231.136.0/21 + 138.231.144.0/21 --> 4096 IPs)
+  \end{itemize}
+\end{frame}
+
+\begin{frame}
+  \frametitle{Au bout du Cr@ns}
+  \begin{itemize}
+  \item Gulp : Routeur principal ipv4, parefeu.
+  \item Odlyd : Serveur de secours (routeur, parefeu, radius, base de données ...)
+  \item Routeur IPv6 sur une machine virtuelle.
+  \item Un CPE (Customer-Premises Equipment) Zayo
+  \end{itemize}
+\end{frame}
+
+\begin{frame}
+  \frametitle{A-t-on tout dit ?}
+  \begin{itemize}
+  \item Radius
+  \item DNS (autoritaires et récursifs)
+  \item DHCP
+\end{itemize}
+\end{frame}
+
+\section*{Infrastructure logicielle}
+
+\begin{frame}
+  \frametitle{VLAN ADM}
+  \begin{itemize}
+  \item VLAN qui ne doit pas être propagé publiquement.
+  \item La plupart des services sont protégés par simple mot de passe, gérés par cranspasswords (utilise du chiffrement)
+  \item Tunnel ssh (cf séminaire de Vulcain dans 2 semaines.)
+  \end{itemize}
+\end{frame}
+
+\begin{frame}
+  \frametitle{Un outil central de gestion}
+  \begin{itemize}
+  \item L'intranet, développé avec Federez.
+  \item Versionné : Gitlab.
+  \item Compte Crans et CAS --> Authentification sur la plupart des services.
+  \item Réplication automatique.
+  \end{itemize}
+\end{frame}
+
+\begin{frame}
+  \frametitle{Des scripts et de la conf}
+  \begin{itemize}
+  \item /usr/scripts
+  \item Bcfg2 --> Ansible : WIP.
+  \end{itemize}
+\end{frame}
+
+\begin{frame}
+  \frametitle{On teste ?}
+
+  \begin{block}{}
+    \og Le code montre que ça marche. \fg
+  \end{block}
+\end{frame}
+
+\begingroup
+\begin{frame}[noframenumbering]
+  \frametitle{On teste ?}
+  \addtocounter{framenumber}{0}
+  \begin{block}{}
+    \og Le code montre que ça marche. \fg \  NON !
+  \end{block}
+\end{frame}
+
+\begin{frame}[noframenumbering]
+  \frametitle{On teste ?}
+
+  \begin{block}{}
+    \og Le code montre que ça marche. \fg \  NON !
+  \end{block}
+
+  \begin{itemize}[<+->]
+  \item Le 2B
+  \item Serveur Vo
+  \item VM Apprentis
+  \item D'autres VM de test
+  \end{itemize}
+\end{frame}
+
+\endgroup
+
+\section*{Monitoring et Backup}
+
+\begin{frame}
+  \frametitle{Monitoring}
+  \begin{itemize}
+  \item Prometheus et Grafana
+  \item Des alertes sur IRC (\#monitoring), par mail.
+  \end{itemize}
+  \includegraphics[width=10cm]{../images/prometheus-monitoring.jpg}
+\end{frame}
+
+\begin{frame}
+  \frametitle{Des systèmes de protection}
+  \begin{itemize}
+  \item Directement sur les switches (DHCP-snooping, ARP-protect ...)
+  \item Des ports de confiance, les autres rejettent les paquets suspects.
+  \end{itemize}
+  \includegraphics[width=8cm]{../images/switch.jpg}  
+\end{frame}
+
+\begin{frame}
+  \frametitle{Secours}
+  \begin{itemize}
+  \item Une freebox de secours
+  \item Serveurs hors campus pour redondance mail/DNS avec un tunnel vers le campus (Wireguard)
+  \item Deux serveurs de backups dans un local séparé.
+  \item Onduleurs
+  \end{itemize}
+\end{frame}
+
+\section*{Les services}
+
+\begin{frame}
+  \frametitle{L'imprimante}
+
+
+  \begin{minipage}[c]{0.46\linewidth}
+    \href{https://giphy.com/gifs/tumbleweed-O38dU2kkQ9sWc/fullscreen}{\beamergotobutton{Link}}
+  \end{minipage}\hfill
+  \begin{minipage}[c]{0.46\linewidth}
+    \href{https://perso.crans.org/bombar/Imprimante_bruit.wav}{\beamergotobutton{418 ?}}
+  \end{minipage}\hfill
+  \begin{figure}
+  \includegraphics[width=8cm]{../images/devil_printer.jpg}
+  \end{figure}
+  
+
+\end{frame}
+
+\begin{frame}
+  \frametitle{La TV}
+
+  \begin{itemize}
+  \item Un serveur : Cochon, au 4J.
+  \item Diffusion en multicast.
+  \item Utilisation de MumuDVB, développé par une vieille nounou.
+  \end{itemize}
+\end{frame}
+
+\begin{frame}
+  \frametitle{Services aux adhérents}
+  \begin{itemize}
+  \item Mails : Webmails, smtp, imap etc
+  \item Pages personnelles
+  \item Compte ssh sur zamok
+  \item 10 Go de stockage (Owncloud, Home)
+  \item Gitlab
+  \end{itemize}
+\end{frame}
+
+\begin{frame}
+  \frametitle{On a tout dit ?}
+  \begin{itemize}
+  \item Le wiki
+  \item IRC
+  \item Listes de diffusion (mailman).
+  \item Miroirs Linux (Debian, Ubuntu)
+  \item PxE
+  \item Phabricator
+  \item (Les news)
+  \item $\cdots$
+  \end{itemize}
+\end{frame}
+
+\section*{La fin}
+
+\begin{frame}
+  \frametitle{Conclusion}
+  \begin{itemize}[<+->]
+  \item Grand panorama de ce qu'on fait au Crans.
+  \item Pas besoin de savoir faire quelque chose initialement, on est là pour apprendre !
+  \item Il y en a pour tous les goûts
+  \item On a plein de projets
+  \item Venez avec vos idées !
+  \end{itemize}
+\end{frame}
+
+\begin{frame}
+  \frametitle{}
+
+  Merci de votre attention !
+\end{frame}
+
+\end{document}

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