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<h1>Architecture du cluster</h1>
<!-- Table of contents -->
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<h2> Contenu </h2>
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<ul class="visible nav section-nav flex-column">
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#topologie">Topologie</a></li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#ce-que-l-agent-suppose-deja-en-place">Ce que l’agent suppose déjà en place</a></li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#pourquoi-un-plan-de-controle-est-necessaire">Pourquoi un plan de contrôle est nécessaire</a></li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#mtu">MTU</a></li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#hyperviseurs-sans-etat">Hyperviseurs sans état</a></li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#adressage">Adressage</a></li>
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<section id="architecture-du-cluster">
<h1>Architecture du cluster<a class="headerlink" href="#architecture-du-cluster" title="Lien vers cette rubrique">#</a></h1>
<section id="topologie">
<h2>Topologie<a class="headerlink" href="#topologie" title="Lien vers cette rubrique">#</a></h2>
<figure class="align-center" id="id1">
<a class="only-light reference internal image-reference" href="../_images/topologie-cluster.svg"><img alt="Topologie du cluster : routeurs, route reflector et hyperviseurs" class="only-light" src="../_images/topologie-cluster.svg" style="width: 100%;" />
</a>
<figcaption>
<p><span class="caption-text">Topologie cible. Trait plein : plan de données. Trait pointillé : plan de contrôle.</span><a class="headerlink" href="#id1" title="Lien vers cette image">#</a></p>
</figcaption>
</figure>
<figure class="align-center" id="id2">
<a class="only-dark reference internal image-reference" href="../_images/topologie-cluster-dark.svg"><img alt="Topologie du cluster : routeurs, route reflector et hyperviseurs" class="only-dark" src="../_images/topologie-cluster-dark.svg" style="width: 100%;" />
</a>
<figcaption>
<p><span class="caption-text">Topologie cible. Trait plein : plan de données. Trait pointillé : plan de contrôle.</span><a class="headerlink" href="#id2" title="Lien vers cette image">#</a></p>
</figcaption>
</figure>
<p>Deux plans distincts, à ne pas confondre au moment du diagnostic :</p>
<dl class="simple">
<dt>Plan de données</dt><dd><p>les tunnels VXLAN entre hyperviseurs, encapsulés sur le réseau qui les relie.</p>
</dd>
<dt>Plan de contrôle</dt><dd><p>ce qui dit à chaque hyperviseur où se trouvent les adresses MAC des autres. C’est le rôle de
FRR et du route reflector.</p>
</dd>
</dl>
</section>
<section id="ce-que-l-agent-suppose-deja-en-place">
<h2>Ce que l’agent suppose déjà en place<a class="headerlink" href="#ce-que-l-agent-suppose-deja-en-place" title="Lien vers cette rubrique">#</a></h2>
<p>L’agent ne configure <strong>que</strong> son propre hyperviseur, et seulement à partir du bridge d’uplink.
Tout ce qui est en amont — adressage des hyperviseurs, routage entre eux, plan de contrôle — lui
préexiste et n’est jamais créé ni vérifié par lui.</p>
<p>Concrètement, il attend :</p>
<ul class="simple">
<li><p>le bridge d’uplink de la configuration (<code class="docutils literal notranslate"><span class="pre">br-000000</span></code> par défaut), avec l’interface physique
esclave et l’adresse de l’hyperviseur portée par le bridge — c’est ce que fait
<code class="docutils literal notranslate"><span class="pre">deploy.sh</span> <span class="pre">--bootstrap</span></code>, voir <a class="reference internal" href="../demarrage/installation.html"><span class="doc">Installation d’un hyperviseur</span></a> ;</p></li>
<li><p>une connectivité IP entre hyperviseurs sur cette adresse, port UDP <strong>4789</strong> ouvert dans les
deux sens ;</p></li>
<li><p>un plan de contrôle qui peuple la table de transfert VXLAN — voir ci-dessous.</p></li>
</ul>
</section>
<section id="pourquoi-un-plan-de-controle-est-necessaire">
<h2>Pourquoi un plan de contrôle est nécessaire<a class="headerlink" href="#pourquoi-un-plan-de-controle-est-necessaire" title="Lien vers cette rubrique">#</a></h2>
<p>L’agent crée les interfaces VXLAN sur le port 4789 <strong>sans groupe multicast et avec
l’apprentissage désactivé</strong> (<code class="docutils literal notranslate"><span class="pre">Learning:</span> <span class="pre">false</span></code>). Il n’y a donc ni inondation multicast, ni
apprentissage des adresses MAC depuis le trafic, ni voisin statique configuré.</p>
<div class="admonition important">
<p class="admonition-title">Important</p>
<p>Conséquence directe : sur un même VNI, <strong>rien ne traverse d’un hyperviseur à l’autre</strong> tant
qu’un composant externe n’a pas peuplé la table de transfert (FDB) du VXLAN. Sur un nœud
isolé le trafic reste sur le bridge local et cette absence ne se voit pas ; elle apparaît dès
le deuxième nœud.</p>
</div>
<p>C’est exactement le rôle que remplissent FRR sur chaque hyperviseur et le route reflector qui
les fait converger.</p>
</section>
<section id="mtu">
<h2>MTU<a class="headerlink" href="#mtu" title="Lien vers cette rubrique">#</a></h2>
<div class="admonition warning">
<p class="admonition-title">Avertissement</p>
<p>L’agent crée bridges, veth et interfaces VXLAN avec un <strong>MTU figé à 1500</strong>. VXLAN ajoute 50
octets d’encapsulation : le réseau qui relie les hyperviseurs doit donc accepter au moins
<strong>1550 octets</strong> de MTU, sinon les paquets pleine taille des VM sont perdus.</p>
<p>Le symptôme est trompeur : le ping passe, les petites requêtes passent, les transferts
volumineux et les poignées de main TLS échouent.</p>
</div>
</section>
<section id="hyperviseurs-sans-etat">
<h2>Hyperviseurs sans état<a class="headerlink" href="#hyperviseurs-sans-etat" title="Lien vers cette rubrique">#</a></h2>
<p>L’hyperviseur est <strong>stateless</strong> — sa racine est en tmpfs, rien de ce que pose
<code class="docutils literal notranslate"><span class="pre">deploy.sh</span> <span class="pre">--bootstrap</span></code> ne survit à un redémarrage, et le script est rejoué à chaque démarrage.</p>
<p>Toute configuration ajoutée à un hyperviseur — FRR compris — doit donc être posée par un
mécanisme rejouable au démarrage, jamais par une modification manuelle d’un fichier sous
<code class="docutils literal notranslate"><span class="pre">/etc</span></code>.</p>
</section>
<section id="adressage">
<h2>Adressage<a class="headerlink" href="#adressage" title="Lien vers cette rubrique">#</a></h2>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p><strong>À rédiger</strong> — cette page ne décrit pas encore le plan d’adressage du cluster. À documenter :</p>
<ul class="simple">
<li><p>la plage utilisée pour les adresses d’hyperviseurs, et son rapport avec <code class="docutils literal notranslate"><span class="pre">br-000000</span></code> ;</p></li>
<li><p>l’allocation des VNI VXLAN : qui la tient, et comment on évite les collisions, puisque
l’agent ne valide pas <code class="docutils literal notranslate"><span class="pre">vxlan_id</span></code> ;</p></li>
<li><p>l’usage prévu de <code class="docutils literal notranslate"><span class="pre">br-public</span></code>, créé vide et réservé par le bootstrap ;</p></li>
<li><p>le plan d’adressage des VPC, et ce qui garantit qu’ils ne se recouvrent pas entre clients.</p></li>
</ul>
</div>
</section>
</section>
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<h1>Déploiement d’un cluster</h1>
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<h1>Déploiement d’un cluster<a class="headerlink" href="#deploiement-d-un-cluster" title="Lien vers cette rubrique">#</a></h1>
<p>Le <a class="reference internal" href="../demarrage/index.html"><span class="doc">Démarrage</span></a> couvre un hyperviseur isolé : un VPC, un subnet, une VM, tout sur le
même nœud. Cette section couvre la mise en place d’un <strong>cluster</strong> complet, dans l’ordre où les
étapes se font.</p>
<p>Cet ordre n’est pas indifférent : chaque étape a besoin de la précédente. L’image doit exister
avant qu’on puisse démarrer quoi que ce soit ; le réseau doit être en place avant le premier
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<li><p><a class="reference internal" href="architecture-cluster.html"><span class="doc">Architecture du cluster</span></a> — la topologie cible, à lire avant tout le reste</p></li>
<li><p><a class="reference internal" href="image-qcow2.html"><span class="doc">Construction de l’image qcow2</span></a> — l’image golden dont dérivent toutes les VM du cluster</p></li>
<li><p><a class="reference internal" href="routeurs.html"><span class="doc">Routeurs</span></a> — le matériel : routeurs de cluster, de datacentre et de bordure</p></li>
<li><p><a class="reference internal" href="premier-hyperviseur.html"><span class="doc">Premier hyperviseur</span></a> — le premier nœud, agent et plan de contrôle</p></li>
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<h1>Premier hyperviseur</h1>
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<h2> Contenu </h2>
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<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#installation">Installation</a></li>
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<section id="premier-hyperviseur">
<h1>Premier hyperviseur<a class="headerlink" href="#premier-hyperviseur" title="Lien vers cette rubrique">#</a></h1>
<p>Le premier nœud du cluster se déploie comme les suivants, mais il est le seul à devoir
fonctionner <strong>avant</strong> que le plan de contrôle existe : c’est lui qui hébergera la première VM
route reflector.</p>
<section id="installation">
<h2>Installation<a class="headerlink" href="#installation" title="Lien vers cette rubrique">#</a></h2>
<p>L’installation de l’agent est identique à celle d’un nœud isolé et n’est pas reprise ici :
voir <a class="reference internal" href="../demarrage/installation.html"><span class="doc">Installation d’un hyperviseur</span></a> pour <code class="docutils literal notranslate"><span class="pre">deploy.sh</span></code>, ses options, la préparation de l’host et
la migration réseau vers le bridge d’uplink.</p>
<p>Deux points à relire avant de lancer un <code class="docutils literal notranslate"><span class="pre">-i</span></code> sur un nœud de production : la migration réseau
coupe le réseau de l’host si elle échoue à mi-parcours, et l’hyperviseur est <strong>sans état</strong> —
tout ce qui est posé doit l’être par un mécanisme rejoué à chaque démarrage.</p>
</section>
<section id="plan-de-controle-frr">
<h2>Plan de contrôle — FRR<a class="headerlink" href="#plan-de-controle-frr" title="Lien vers cette rubrique">#</a></h2>
<p>FRR tourne sur chaque hyperviseur et peuple la table de transfert (FDB) des interfaces VXLAN
créées par l’agent. C’est ce qui rend un subnet utilisable au-delà d’un seul nœud, puisque
l’agent désactive l’apprentissage et ne configure aucun voisin — cf.
<a class="reference internal" href="architecture-cluster.html"><span class="doc">Architecture du cluster</span></a>.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p><strong>À rédiger.</strong> À documenter :</p>
<ul class="simple">
<li><p>la version de FRR de référence et son mode d’installation, sachant que l’hyperviseur est
sans état : le paquet et la configuration doivent être posés à chaque démarrage, par le
bootstrap ou par un mécanisme équivalent ;</p></li>
<li><p>les démons activés dans <code class="docutils literal notranslate"><span class="pre">/etc/frr/daemons</span></code> ;</p></li>
<li><p>la configuration de référence : numéro d’AS, session vers le route reflector, famille
d’adresses utilisée pour annoncer les MAC et les VNI ;</p></li>
<li><p>l’articulation avec les interfaces créées par l’agent : comment FRR découvre une interface
VXLAN qui apparaît à la création d’un subnet, et si une action est nécessaire ensuite ;</p></li>
<li><p>ce qui se passe au démarrage à froid, quand FRR démarre avant ou après l’agent ;</p></li>
<li><p>le cas particulier du <strong>premier</strong> hyperviseur, dont la session ne peut pas s’établir tant
que le route reflector n’existe pas.</p></li>
</ul>
</div>
</section>
<section id="verifier-le-plan-de-donnees">
<h2>Vérifier le plan de données<a class="headerlink" href="#verifier-le-plan-de-donnees" title="Lien vers cette rubrique">#</a></h2>
<p>Ces deux vérifications restent valables quelle que soit la configuration retenue, et méritent
d’être dans toute procédure de diagnostic :</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span><span class="c1"># La FDB du VXLAN doit contenir des entrées vers les autres hyperviseurs.</span>
<span class="c1"># Vide, c'est le plan de contrôle qui ne fonctionne pas, pas l'agent.</span>
ip<span class="w"> </span>netns<span class="w"> </span><span class="nb">exec</span><span class="w"> </span>&lt;vpc&gt;<span class="w"> </span>bridge<span class="w"> </span>fdb<span class="w"> </span>show<span class="w"> </span>dev<span class="w"> </span>&lt;interface-vxlan&gt;
<span class="c1"># L'interface VXLAN telle que l'agent l'a créée : port 4789, learning off,</span>
<span class="c1"># aucun groupe multicast, aucun remote.</span>
ip<span class="w"> </span>netns<span class="w"> </span><span class="nb">exec</span><span class="w"> </span>&lt;vpc&gt;<span class="w"> </span>ip<span class="w"> </span>-d<span class="w"> </span>link<span class="w"> </span>show<span class="w"> </span>&lt;interface-vxlan&gt;
</pre></div>
</div>
<div class="admonition important">
<p class="admonition-title">Important</p>
<p>Une FDB vide alors que le subnet est en <code class="docutils literal notranslate"><span class="pre">running</span></code> n’est <strong>pas</strong> un défaut de l’agent : il
crée délibérément l’interface sans apprentissage ni voisin, et laisse le peuplement au plan
de contrôle.</p>
</div>
</section>
<section id="valider-le-noeud">
<h2>Valider le nœud<a class="headerlink" href="#valider-le-noeud" title="Lien vers cette rubrique">#</a></h2>
<p>Avant de passer à la suite, le nœud doit savoir créer une VM de bout en bout à partir de l’image
golden — c’est exactement le parcours de <a class="reference internal" href="../demarrage/premier-vpc.html"><span class="doc">Premier VPC, premier subnet, première VM</span></a>, avec
<code class="docutils literal notranslate"><span class="pre">storage[0].path</span></code> pointant sur une copie de l’image produite par <a class="reference internal" href="image-qcow2.html"><span class="doc">Construction de l’image qcow2</span></a>.</p>
<p>Une VM qui démarre, obtient son adresse en DHCP et applique son user-data valide d’un coup
l’agent, le DHCP, la route vers le serveur de metadata et l’image. C’est le prérequis de
<a class="reference internal" href="route-reflector.html"><span class="doc">VM route reflector</span></a>.</p>
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<h1>VM route reflector</h1>
<!-- Table of contents -->
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<h2> Contenu </h2>
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<h1>VM route reflector<a class="headerlink" href="#vm-route-reflector" title="Lien vers cette rubrique">#</a></h1>
<p>Le route reflector est le point de rendez-vous du plan de contrôle : plutôt que de maintenir une
session entre chaque paire d’hyperviseurs, chaque hyperviseur ouvre une session vers le route
reflector, qui redistribue.</p>
<p>Il tourne lui-même en machine virtuelle, ce qui crée une dépendance circulaire à traiter
explicitement : la VM qui porte le plan de contrôle du cluster est hébergée par le cluster.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p><strong>À rédiger.</strong> À documenter :</p>
<ul class="simple">
<li><p>la création de la VM : ressources, subnet et mode utilisés, et s’il s’agit d’une VM créée
par l’agent comme les autres ou d’un cas particulier — l’image, elle, est l’image golden de
<a class="reference internal" href="image-qcow2.html"><span class="doc">Construction de l’image qcow2</span></a> ;</p></li>
<li><p>son adressage, et comment les hyperviseurs le connaissent ;</p></li>
<li><p>la configuration du démon de routage qu’elle héberge ;</p></li>
<li><p>la redondance : une seule VM route reflector, ou deux, et sur quels hyperviseurs ;</p></li>
<li><p>la procédure de reconstruction, et l’état du cluster pendant que le route reflector est
absent — les tunnels déjà établis continuent-ils de fonctionner, et pendant combien de
temps ;</p></li>
<li><p>la procédure d’amorçage : ce qui fonctionne, et dans quel ordre, quand on démarre un cluster
entier depuis zéro — le premier hyperviseur n’a pas de session FRR établie tant que cette VM
n’existe pas, cf. <a class="reference internal" href="premier-hyperviseur.html"><span class="doc">Premier hyperviseur</span></a>.</p></li>
</ul>
</div>
<section id="points-de-vigilance">
<h2>Points de vigilance<a class="headerlink" href="#points-de-vigilance" title="Lien vers cette rubrique">#</a></h2>
<div class="admonition warning">
<p class="admonition-title">Avertissement</p>
<p>L’agent <strong>ne réattache pas</strong> les VM existantes à son démarrage, et les processus QEMU ne
survivent pas à un redémarrage de l’hyperviseur. Le redémarrage de l’hyperviseur qui héberge
le route reflector est donc un événement à part entière : la procédure de remise en service
doit être écrite, et testée.</p>
</div>
<div class="admonition warning">
<p class="admonition-title">Avertissement</p>
<p><code class="docutils literal notranslate"><span class="pre">instance-id</span></code> valant le nom de la VM, recréer la VM route reflector sous le même nom sur le
même disque fait que cloud-init <strong>ne rejoue pas</strong> le user-data. Cf.
<a class="reference internal" href="../concepts/metadata-cloud-init.html"><span class="doc">Metadata et cloud-init</span></a>.</p>
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<h1>Routeurs</h1>
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<h2> Contenu </h2>
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<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#contraintes-imposees-par-le-reste-du-cluster">Contraintes imposées par le reste du cluster</a></li>
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<section id="routeurs">
<h1>Routeurs<a class="headerlink" href="#routeurs" title="Lien vers cette rubrique">#</a></h1>
<p>Trois niveaux de routage entourent le cluster, du plus proche des hyperviseurs au plus proche de
l’extérieur. Tous préexistent à l’agent : celui-ci ne les configure pas et n’en a aucune
connaissance.</p>
<dl class="simple">
<dt>Routeurs de cluster</dt><dd><p>raccordent les hyperviseurs entre eux. C’est le niveau dont dépend directement le plan de
données VXLAN.</p>
</dd>
<dt>Routeurs de datacentre</dt><dd><p>agrègent les clusters d’un même site.</p>
</dd>
<dt>Routeurs de bordure</dt><dd><p>terminent le routage vers l’extérieur.</p>
</dd>
</dl>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p><strong>À rédiger.</strong> Cette page attend les éléments de terrain. Pour chacun des trois niveaux :</p>
<ul class="simple">
<li><p>le matériel ou le logiciel employé, et la version de référence ;</p></li>
<li><p>la configuration de référence : interfaces, adressage, protocole de routage et numéros
d’AS ;</p></li>
<li><p>la redondance : combien d’équipements, quel mécanisme de bascule, quel comportement attendu
pendant une bascule ;</p></li>
<li><p>ce qui est annoncé et ce qui est filtré à chaque niveau ;</p></li>
<li><p>l’ordre de mise en service, et ce qui doit être opérationnel avant de préparer le premier
hyperviseur.</p></li>
</ul>
</div>
<section id="contraintes-imposees-par-le-reste-du-cluster">
<h2>Contraintes imposées par le reste du cluster<a class="headerlink" href="#contraintes-imposees-par-le-reste-du-cluster" title="Lien vers cette rubrique">#</a></h2>
<p>Indépendamment des choix d’équipement, deux contraintes viennent de ce que fait l’agent.</p>
<div class="admonition warning">
<p class="admonition-title">Avertissement</p>
<p><strong>MTU</strong> — l’agent crée bridges, veth et interfaces VXLAN avec un MTU figé à 1500, et VXLAN
ajoute 50 octets d’encapsulation. Les liens entre hyperviseurs doivent donc accepter au moins
<strong>1550 octets</strong>. Cf. <a class="reference internal" href="architecture-cluster.html"><span class="doc">Architecture du cluster</span></a>.</p>
</div>
<div class="admonition warning">
<p class="admonition-title">Avertissement</p>
<p><strong>UDP 4789</strong> doit passer entre hyperviseurs, dans les deux sens : c’est le port des tunnels
VXLAN.</p>
</div>
<div class="admonition warning">
<p class="admonition-title">Avertissement</p>
<p><strong>L’API de l’agent n’a aucune authentification.</strong> Le filtrage réalisé ici est aujourd’hui
l’une des rares barrières entre cette API et le reste du réseau : son port ne doit être
joignable que depuis le réseau d’administration. Cf. <a class="reference internal" href="../exploitation/configuration.html"><span class="doc">Configuration</span></a>.</p>
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