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<text class="grp" x="60" y="44">ROUTEURS DE CLUSTER · AS 65100</text>
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<text class="lbl" x="145" y="92" text-anchor="middle">routeur 1</text>
<text class="sub" x="145" y="111" text-anchor="middle">169.254.0.1/28</text>
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<text class="sub" x="240" y="150" text-anchor="middle">passerelle 192.168.14.1/24</text>
<rect class="group" x="560" y="20" width="400" height="144" rx="8"/>
<text class="grp" x="580" y="44">VM ROUTE REFLECTOR · AS 65000</text>
<text class="lbl" x="580" y="70">lo1 · 10.255.255.1/32</text>
<text class="sub" x="580" y="87">router-id, cluster-id, source des sessions EVPN</text>
<text class="lbl" x="580" y="111">192.168.14.2/24 · 169.254.0.3/28</text>
<text class="sub" x="580" y="128">principale, et secondaire pour le lien avec les routeurs</text>
<text class="sub" x="580" y="150">hébergée par le cluster lui-même</text>
<path class="ctrl" d="M440 92 L560 92"/>
<text class="ctrlt" x="500" y="84" text-anchor="middle">eBGP · BFD (×2)</text>
<text class="ctrlt" x="500" y="108" text-anchor="middle">annonce lo1 seule</text>
<text class="ctrlt" x="500" y="122" text-anchor="middle">n'accepte rien</text>
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<text class="lbl" x="484" y="194" text-anchor="middle">segment underlay · L2</text>
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<rect class="box" x="274" y="366" width="180" height="46" rx="6"/>
<text class="lbl" x="364" y="385" text-anchor="middle">vxlan-&lt;vni&gt;</text>
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<text class="sub" x="372" y="359">VTEP</text>
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<text class="lbl" x="146" y="321" text-anchor="middle">FRR</text>
<text class="sub" x="146" y="340" text-anchor="middle">bgpd · AS 64600</text>
<text class="sub" x="146" y="356" text-anchor="middle">advertise-all-vni</text>
<rect class="box" x="56" y="434" width="180" height="46" rx="6"/>
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<text class="lbl" x="636" y="385" text-anchor="middle">vxlan-&lt;vni&gt;</text>
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<text class="ctrlt" x="384" y="240">iBGP l2vpn evpn · AS 64600</text>
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<text class="datat" x="500" y="406" text-anchor="middle">UDP 4789</text>
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<text class="sub" x="84" y="608">lien L2 / interface</text>
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<text class="sub" x="514" y="608">plan de contrôle : sessions BGP</text>
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<text class="sub" x="760" y="608">créé par l'agent</text>
<text class="sub" x="40" y="640">Les hyperviseurs joignent 10.255.255.1 par leur passerelle 192.168.14.1 : les routeurs l'ont apprise du route reflector en eBGP, sans rien lui renvoyer.</text>
<text class="sub" x="40" y="658">Le route reflector accepte toute session venant de 192.168.14.0/24 (bgp listen range) et réfléchit les routes EVPN entre hyperviseurs.</text>
<text class="sub" x="40" y="676">Chaque FRR en peuple la FDB des VXLAN locaux — intégration de FRR avec les interfaces créées par two : à qualifier (#50, E5).</text>
<text class="sub" x="40" y="694">MTU du segment : 1550 au moins (VXLAN figé à 1500 par l'agent, + 50 octets d'encapsulation) ; 9000 dans le lab.</text>
<text class="sub" x="40" y="712">ASN, loopback et plages : valeurs de production (#50). Adresses en 192.168.14.0/24 : celles du lab. Placement de la VM route reflector : à rédiger.</text>
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 736" width="1000" height="736" role="img" aria-label="Architecture du cluster : routeurs, route reflector, hyperviseurs, plans de données et de contrôle">
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<text class="grp" x="580" y="44">VM ROUTE REFLECTOR · AS 65000</text>
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<text class="sub" x="580" y="87">router-id, cluster-id, source des sessions EVPN</text>
<text class="lbl" x="580" y="111">192.168.14.2/24 · 169.254.0.3/28</text>
<text class="sub" x="580" y="128">principale, et secondaire pour le lien avec les routeurs</text>
<text class="sub" x="580" y="150">hébergée par le cluster lui-même</text>
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<text class="ctrlt" x="500" y="84" text-anchor="middle">eBGP · BFD (×2)</text>
<text class="ctrlt" x="500" y="108" text-anchor="middle">annonce lo1 seule</text>
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<text class="lbl" x="146" y="321" text-anchor="middle">FRR</text>
<text class="sub" x="146" y="340" text-anchor="middle">bgpd · AS 64600</text>
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<text class="sub" x="854" y="340" text-anchor="middle">bgpd · AS 64600</text>
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<text class="lbl" x="854" y="453" text-anchor="middle">agent</text>
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<text class="ctrlt" x="384" y="240">iBGP l2vpn evpn · AS 64600</text>
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<text class="datat" x="500" y="378" text-anchor="middle">VXLAN</text>
<text class="datat" x="500" y="406" text-anchor="middle">UDP 4789</text>
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<text class="sub" x="514" y="608">plan de contrôle : sessions BGP</text>
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<text class="sub" x="760" y="608">créé par l'agent</text>
<text class="sub" x="40" y="640">Les hyperviseurs joignent 10.255.255.1 par leur passerelle 192.168.14.1 : les routeurs l'ont apprise du route reflector en eBGP, sans rien lui renvoyer.</text>
<text class="sub" x="40" y="658">Le route reflector accepte toute session venant de 192.168.14.0/24 (bgp listen range) et réfléchit les routes EVPN entre hyperviseurs.</text>
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<text class="sub" x="40" y="694">MTU du segment : 1550 au moins (VXLAN figé à 1500 par l'agent, + 50 octets d'encapsulation) ; 9000 dans le lab.</text>
<text class="sub" x="40" y="712">ASN, loopback et plages : valeurs de production (#50). Adresses en 192.168.14.0/24 : celles du lab. Placement de la VM route reflector : à rédiger.</text>
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@ -218,6 +218,13 @@
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@ -218,6 +218,13 @@
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@ -654,6 +654,13 @@ window.runMermaid = runMermaid;</script>
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@ -55,7 +55,7 @@
<link rel="index" title="Index" href="../genindex.html" />
<link rel="search" title="Recherche" href="../search.html" />
<link rel="next" title="VPC, subnet et VM" href="vpc-subnet-vm.html" />
<link rel="prev" title="Diagnostic" href="../exploitation/diagnostic.html" />
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<meta name="viewport" content="width=device-width, initial-scale=1"/>
<meta name="docsearch:language" content="fr"/>
<meta name="docsearch:version" content="0.1" />
@ -218,6 +218,13 @@
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@ -364,12 +371,12 @@ fonctionnent entre eux. Le contrat HTTP correspondant est dans
<div class="prev-next-area">
<a class="left-prev"
href="../exploitation/diagnostic.html"
href="../developpement/lab.html"
title="page précédente">
<i class="fa-solid fa-angle-left"></i>
<div class="prev-next-info">
<p class="prev-next-subtitle">précédent</p>
<p class="prev-next-title">Diagnostic</p>
<p class="prev-next-title">Lab de test multi-nœud</p>
</div>
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@ -654,6 +654,13 @@ window.runMermaid = runMermaid;</script>
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@ -654,6 +654,13 @@ window.runMermaid = runMermaid;</script>
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@ -654,6 +654,13 @@ window.runMermaid = runMermaid;</script>
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@ -218,6 +218,13 @@
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@ -654,6 +654,13 @@ window.runMermaid = runMermaid;</script>
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@ -218,6 +218,13 @@
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@ -357,17 +364,19 @@
<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 class="only-light reference internal image-reference" href="../_images/architecture-cluster.svg"><img alt="Architecture du cluster : routeurs, route reflector, hyperviseurs, plans de données et de contrôle" class="only-light" src="../_images/architecture-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>
<p><span class="caption-text">Architecture cible. Trait bleu : plan de données (VXLAN). Tirets violets : plan de contrôle
(sessions BGP). Pointillé gris : interfaces créées par l’agent.</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 class="only-dark reference internal image-reference" href="../_images/architecture-cluster-dark.svg"><img alt="Architecture du cluster : routeurs, route reflector, hyperviseurs, plans de données et de contrôle" class="only-dark" src="../_images/architecture-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>
<p><span class="caption-text">Architecture cible. Trait bleu : plan de données (VXLAN). Tirets violets : plan de contrôle
(sessions BGP). Pointillé gris : interfaces créées par l’agent.</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>

View file

@ -654,6 +654,13 @@ window.runMermaid = runMermaid;</script>
</ul>
</details></li>
</ul>
<p aria-level="2" class="caption" role="heading"><span class="caption-text">Développement</span></p>
<ul class="nav bd-sidenav">
<li class="toctree-l1 has-children"><a class="reference internal" href="../developpement/index.html">Développement</a><details><summary><span class="toctree-toggle" role="presentation"><i class="fa-solid fa-chevron-down"></i></span></summary><ul>
<li class="toctree-l2"><a class="reference internal" href="../developpement/lab.html">Lab de test multi-nœud</a></li>
</ul>
</details></li>
</ul>
<p aria-level="2" class="caption" role="heading"><span class="caption-text">Interne</span></p>
<ul class="nav bd-sidenav">
<li class="toctree-l1 has-children"><a class="reference internal" href="../concepts/index.html">Concepts</a><details><summary><span class="toctree-toggle" role="presentation"><i class="fa-solid fa-chevron-down"></i></span></summary><ul>
@ -1027,7 +1034,7 @@ cat<span class="w"> </span><span class="s">&lt;&lt; 'ENDFILE' &gt; /mnt/etc/clou
<span class="s">datasource_list: [ NoCloud ]</span>
<span class="s">datasource:</span>
<span class="s"> NoCloud:</span>
<span class="s"> seedfrom: 'http://169.254.169.254:80'</span>
<span class="s"> seedfrom: 'http://169.254.169.254:80/'</span>
<span class="s"> timeout: 5</span>
<span class="s"> max_wait: 10</span>
<span class="s">ENDFILE</span>
@ -1087,12 +1094,16 @@ ni <code class="docutils literal notranslate"><span class="pre">detect-zeroes=un
aucun espace à l’host : les qcow2 ne se rétractent pas. L’activation reste utile pour le jour
où l’option sera ajoutée côté agent, mais ne pas compter dessus pour la place disque.</p>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p><strong>À vérifier</strong> — <code class="docutils literal notranslate"><span class="pre">seedfrom</span></code> sans barre oblique finale. cloud-init construit l’URL des
documents en concaténant <code class="docutils literal notranslate"><span class="pre">seedfrom</span></code> avec <code class="docutils literal notranslate"><span class="pre">meta-data</span></code> et <code class="docutils literal notranslate"><span class="pre">user-data</span></code>. Confirmer sur une
VM réelle que les deux documents sont bien récupérés, et corriger en
<code class="docutils literal notranslate"><span class="pre">http://169.254.169.254:80/</span></code> si ce n’est pas le cas.</p>
<div class="admonition warning">
<p class="admonition-title">Avertissement</p>
<p><strong>La barre oblique finale de</strong> <code class="docutils literal notranslate"><span class="pre">seedfrom</span></code> <strong>est indispensable avant cloud-init 23.1.</strong>
cloud-init construit l’URL des documents en concaténant <code class="docutils literal notranslate"><span class="pre">seedfrom</span></code> avec <code class="docutils literal notranslate"><span class="pre">meta-data</span></code>,
<code class="docutils literal notranslate"><span class="pre">user-data</span></code> et <code class="docutils literal notranslate"><span class="pre">vendor-data</span></code> (<code class="docutils literal notranslate"><span class="pre">util.read_seeded</span></code>). Jusqu’à la 22.4 — celle de Debian 12,
22.4.2 —, sans barre oblique finale il demande <code class="docutils literal notranslate"><span class="pre">http://169.254.169.254:80meta-data</span></code> : la
source échoue, la VM démarre en <code class="docutils literal notranslate"><span class="pre">DataSourceNone</span></code>, sans nom d’hôte ni user-data. À partir de
23.1, un drapeau actif par défaut (<code class="docutils literal notranslate"><span class="pre">NOCLOUD_SEED_URL_APPEND_FORWARD_SLASH</span></code>) ajoute la barre
oblique manquante, ce qui explique qu’une image récente fonctionne sans elle. Avec la barre
oblique, la configuration fonctionne quelle que soit la version de cloud-init.</p>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>

View file

@ -218,6 +218,13 @@
</ul>
</details></li>
</ul>
<p aria-level="2" class="caption" role="heading"><span class="caption-text">Développement</span></p>
<ul class="nav bd-sidenav">
<li class="toctree-l1 has-children"><a class="reference internal" href="../developpement/index.html">Développement</a><details><summary><span class="toctree-toggle" role="presentation"><i class="fa-solid fa-chevron-down"></i></span></summary><ul>
<li class="toctree-l2"><a class="reference internal" href="../developpement/lab.html">Lab de test multi-nœud</a></li>
</ul>
</details></li>
</ul>
<p aria-level="2" class="caption" role="heading"><span class="caption-text">Interne</span></p>
<ul class="nav bd-sidenav">
<li class="toctree-l1 has-children"><a class="reference internal" href="../concepts/index.html">Concepts</a><details><summary><span class="toctree-toggle" role="presentation"><i class="fa-solid fa-chevron-down"></i></span></summary><ul>

View file

@ -218,6 +218,13 @@
</ul>
</details></li>
</ul>
<p aria-level="2" class="caption" role="heading"><span class="caption-text">Développement</span></p>
<ul class="nav bd-sidenav">
<li class="toctree-l1 has-children"><a class="reference internal" href="../developpement/index.html">Développement</a><details><summary><span class="toctree-toggle" role="presentation"><i class="fa-solid fa-chevron-down"></i></span></summary><ul>
<li class="toctree-l2"><a class="reference internal" href="../developpement/lab.html">Lab de test multi-nœud</a></li>
</ul>
</details></li>
</ul>
<p aria-level="2" class="caption" role="heading"><span class="caption-text">Interne</span></p>
<ul class="nav bd-sidenav">
<li class="toctree-l1 has-children"><a class="reference internal" href="../concepts/index.html">Concepts</a><details><summary><span class="toctree-toggle" role="presentation"><i class="fa-solid fa-chevron-down"></i></span></summary><ul>
@ -336,7 +343,11 @@
<nav aria-label="Page">
<ul class="visible nav section-nav flex-column">
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#installation">Installation</a></li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#plan-de-controle-frr">Plan de contrôle — FRR</a></li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#plan-de-controle-frr">Plan de contrôle — FRR</a><ul class="nav section-nav flex-column">
<li class="toc-h3 nav-item toc-entry"><a class="reference internal nav-link" href="#configuration-de-frr">Configuration de FRR</a></li>
<li class="toc-h3 nav-item toc-entry"><a class="reference internal nav-link" href="#articulation-avec-l-agent">Articulation avec l’agent</a></li>
</ul>
</li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#verifier-le-plan-de-donnees">Vérifier le plan de données</a></li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#valider-le-noeud">Valider le nœud</a></li>
</ul>
@ -370,24 +381,68 @@ tout ce qui est posé doit l’être par un mécanisme rejoué à chaque démarr
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>
<section id="configuration-de-frr">
<h3>Configuration de FRR<a class="headerlink" href="#configuration-de-frr" title="Lien vers cette rubrique">#</a></h3>
<p>Seul <code class="docutils literal notranslate"><span class="pre">bgpd</span></code> est activé dans <code class="docutils literal notranslate"><span class="pre">/etc/frr/daemons</span></code>. D’un hyperviseur à l’autre ne changent que
<code class="docutils literal notranslate"><span class="pre">hostname</span></code> et <code class="docutils literal notranslate"><span class="pre">router-id</span></code>, l’adresse de l’hyperviseur sur son segment.</p>
<div class="highlight-text notranslate"><div class="highlight"><pre><span></span>frr defaults traditional
hostname hv1
log syslog informational
!
router bgp 64600
bgp router-id 192.168.14.11
no bgp default ipv4-unicast
neighbor fabric peer-group
neighbor fabric remote-as 64600
neighbor fabric capability extended-nexthop
neighbor 10.255.255.1 peer-group fabric
!
address-family l2vpn evpn
neighbor fabric activate
advertise-all-vni
exit-address-family
!
exit
!
</pre></div>
</div>
<p>Ce qu’elle établit :</p>
<ul class="simple">
<li><p><strong>Une seule session</strong>, en iBGP dans l’AS 64600, vers la loopback du route reflector
(<code class="docutils literal notranslate"><span class="pre">10.255.255.1</span></code>), jointe par la passerelle par défaut — le routeur de cluster l’a apprise du
route reflector (<a class="reference internal" href="routeurs.html"><span class="doc">Routeurs</span></a>). Aucune adresse d’un autre hyperviseur n’est écrite : ajouter
un nœud ne touche pas la configuration des autres.</p></li>
<li><p><strong>EVPN seulement</strong> : l’IPv4 unicast n’est pas activé (<code class="docutils literal notranslate"><span class="pre">no</span> <span class="pre">bgp</span> <span class="pre">default</span> <span class="pre">ipv4-unicast</span></code>).
<code class="docutils literal notranslate"><span class="pre">advertise-all-vni</span></code> annonce les VNI de toutes les interfaces VXLAN que FRR voit, et donc
celles que l’agent crée.</p></li>
<li><p><strong>Pas de BFD</strong> sur cette session, contrairement à la session entre route reflector et routeur.</p></li>
</ul>
</section>
<section id="articulation-avec-l-agent">
<h3>Articulation avec l’agent<a class="headerlink" href="#articulation-avec-l-agent" title="Lien vers cette rubrique">#</a></h3>
<p>Rien à configurer à la création d’un subnet : la VXLAN apparaît, FRR la voit et l’annonce, sans
action ni redémarrage. Il faut en revanche que la VXLAN porte une <strong>adresse VTEP locale</strong> : sans
elle, FRR voit la VNI mais n’annonce rien, et deux hyperviseurs gérés par two ne se joignent pas.
L’agent la pose à partir de la release <code class="docutils literal notranslate"><span class="pre">0.2.0rc003</span></code>
(<a class="reference external" href="https://git.g3e.fr/syonad/two/issues/51">#51</a>) : l’adresse IPv4 primaire du <code class="docutils literal notranslate"><span class="pre">local_iface</span></code>
du subnet.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p><strong>À rédiger.</strong> À documenter :</p>
<p><strong>À rédiger.</strong> Reste 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>la version de FRR de référence et son installation sur l’hyperviseur <strong>sans état</strong> : paquet
et configuration doivent être posés à chaque démarrage, par le bootstrap ou un mécanisme
équivalent (<a class="reference external" href="https://git.g3e.fr/syonad/two/issues/52">#52</a>) ;</p></li>
<li><p>le démarrage à froid, selon que FRR démarre avant ou après l’agent ;</p></li>
<li><p>les subnets <code class="docutils literal notranslate"><span class="pre">vxlan</span></code> créés avant <code class="docutils literal notranslate"><span class="pre">0.2.0rc003</span></code>, dont la VXLAN n’a pas d’adresse VTEP
locale : les recréer ou poser l’adresse à chaud, à trancher dans
<a class="reference external" href="https://git.g3e.fr/syonad/two/issues/51">#51</a> ;</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>
<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
@ -467,7 +522,11 @@ l’agent, le DHCP, la route vers le serveur de metadata et l’image. C’est l
<nav id="pst-page-toc-nav" class="page-toc" aria-labelledby="pst-page-navigation-heading-2">
<ul class="visible nav section-nav flex-column">
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#installation">Installation</a></li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#plan-de-controle-frr">Plan de contrôle — FRR</a></li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#plan-de-controle-frr">Plan de contrôle — FRR</a><ul class="nav section-nav flex-column">
<li class="toc-h3 nav-item toc-entry"><a class="reference internal nav-link" href="#configuration-de-frr">Configuration de FRR</a></li>
<li class="toc-h3 nav-item toc-entry"><a class="reference internal nav-link" href="#articulation-avec-l-agent">Articulation avec l’agent</a></li>
</ul>
</li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#verifier-le-plan-de-donnees">Vérifier le plan de données</a></li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#valider-le-noeud">Valider le nœud</a></li>
</ul>

View file

@ -218,6 +218,13 @@
</ul>
</details></li>
</ul>
<p aria-level="2" class="caption" role="heading"><span class="caption-text">Développement</span></p>
<ul class="nav bd-sidenav">
<li class="toctree-l1 has-children"><a class="reference internal" href="../developpement/index.html">Développement</a><details><summary><span class="toctree-toggle" role="presentation"><i class="fa-solid fa-chevron-down"></i></span></summary><ul>
<li class="toctree-l2"><a class="reference internal" href="../developpement/lab.html">Lab de test multi-nœud</a></li>
</ul>
</details></li>
</ul>
<p aria-level="2" class="caption" role="heading"><span class="caption-text">Interne</span></p>
<ul class="nav bd-sidenav">
<li class="toctree-l1 has-children"><a class="reference internal" href="../concepts/index.html">Concepts</a><details><summary><span class="toctree-toggle" role="presentation"><i class="fa-solid fa-chevron-down"></i></span></summary><ul>
@ -335,6 +342,8 @@
</div>
<nav aria-label="Page">
<ul class="visible nav section-nav flex-column">
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#adressage">Adressage</a></li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#configuration-de-frr">Configuration de FRR</a></li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#points-de-vigilance">Points de vigilance</a></li>
</ul>
</nav>
@ -354,24 +363,142 @@ session entre chaque paire d’hyperviseurs, chaque hyperviseur ouvre une sessio
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>
<section id="adressage">
<h2>Adressage<a class="headerlink" href="#adressage" title="Lien vers cette rubrique">#</a></h2>
<p>Le route reflector est <strong>sur le même segment L2 que les hyperviseurs</strong>, avec trois adresses :</p>
<div class="pst-scrollable-table-container"><table class="table">
<colgroup>
<col style="width: 30.0%" />
<col style="width: 25.0%" />
<col style="width: 45.0%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>Adresse</p></th>
<th class="head"><p>Interface</p></th>
<th class="head"><p>Rôle</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>une adresse de <code class="docutils literal notranslate"><span class="pre">192.168.14.0/24</span></code></p></td>
<td><p>interface principale</p></td>
<td><p>celle de n’importe quelle machine du segment ; les réponses aux hyperviseurs en partent</p></td>
</tr>
<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">169.254.0.3/28</span></code></p></td>
<td><p>interface principale, <strong>adresse secondaire</strong></p></td>
<td><p>le lien avec les routeurs de cluster (<code class="docutils literal notranslate"><span class="pre">169.254.0.1</span></code> et <code class="docutils literal notranslate"><span class="pre">.2</span></code>), sur le même L2</p></td>
</tr>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">10.255.255.1/32</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">lo1</span></code>, interface <code class="docutils literal notranslate"><span class="pre">dummy</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">router-id</span></code>, <code class="docutils literal notranslate"><span class="pre">cluster-id</span></code> et source des sessions EVPN ; seule route annoncée aux routeurs</p></td>
</tr>
</tbody>
</table>
</div>
<p>Les hyperviseurs ne connaissent que la loopback : ils ouvrent leur session vers <code class="docutils literal notranslate"><span class="pre">10.255.255.1</span></code>
par leur passerelle (<code class="docutils literal notranslate"><span class="pre">192.168.14.1</span></code>), les routeurs l’ayant apprise du route reflector en eBGP.
Aucune adresse d’hyperviseur n’est déclarée côté route reflector : il accepte toute session venant
du segment (<code class="docutils literal notranslate"><span class="pre">bgp</span> <span class="pre">listen</span> <span class="pre">range</span></code>).</p>
<p>L’adresse du lien est une <strong>adresse secondaire</strong> de l’interface principale, pas une interface à
part : même L2, même MAC sur le fil, une interface de moins qu’avec un <code class="docutils literal notranslate"><span class="pre">ipvlan</span></code>. Elle doit
survivre aux renouvellements DHCP de l’adresse principale : la déclarer dans la configuration
réseau du système, pas la poser à la main.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p><strong>À rédiger.</strong> À documenter :</p>
<p><strong>Non vérifié sur l’image de production.</strong> Avec NetworkManager, la forme attendue est :</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>nmcli<span class="w"> </span>connection<span class="w"> </span>modify<span class="w"> </span>&lt;connexion&gt;<span class="w"> </span>+ipv4.addresses<span class="w"> </span><span class="m">169</span>.254.0.3/28
nmcli<span class="w"> </span>connection<span class="w"> </span>add<span class="w"> </span><span class="nb">type</span><span class="w"> </span>dummy<span class="w"> </span>ifname<span class="w"> </span>lo1<span class="w"> </span>con-name<span class="w"> </span>lo1<span class="w"> </span><span class="se">\</span>
<span class="w"> </span>ipv4.method<span class="w"> </span>manual<span class="w"> </span>ipv4.addresses<span class="w"> </span><span class="m">10</span>.255.255.1/32<span class="w"> </span>ipv6.method<span class="w"> </span>disabled
</pre></div>
</div>
<p>Ces commandes restent à valider sur l’image golden.</p>
</div>
</section>
<section id="configuration-de-frr">
<h2>Configuration de FRR<a class="headerlink" href="#configuration-de-frr" title="Lien vers cette rubrique">#</a></h2>
<p><code class="docutils literal notranslate"><span class="pre">bgpd</span></code> et <code class="docutils literal notranslate"><span class="pre">bfdd</span></code> activés dans <code class="docutils literal notranslate"><span class="pre">/etc/frr/daemons</span></code>.</p>
<div class="highlight-text notranslate"><div class="highlight"><pre><span></span>frr defaults traditional
hostname rr1
log syslog informational
!
ip prefix-list RR-LOOPBACK-OUT seq 10 permit 10.255.255.1/32
!
route-map NO-IN deny 999
description deny
exit
!
router bgp 65000
no bgp default ipv4-unicast
bgp router-id 10.255.255.1
bgp cluster-id 10.255.255.1
neighbor CLUSTER peer-group
neighbor CLUSTER remote-as 65100
neighbor CLUSTER bfd
neighbor 169.254.0.1 peer-group CLUSTER
neighbor 169.254.0.1 description router-1
neighbor 169.254.0.2 peer-group CLUSTER
neighbor 169.254.0.2 description router-2
neighbor fabric peer-group
neighbor fabric remote-as 64600
neighbor fabric local-as 64600 no-prepend replace-as
neighbor fabric capability extended-nexthop
neighbor fabric update-source 10.255.255.1
bgp listen range 192.168.14.0/24 peer-group fabric
bgp listen limit 200
!
address-family ipv4 unicast
network 10.255.255.1/32
neighbor CLUSTER activate
neighbor CLUSTER prefix-list RR-LOOPBACK-OUT out
neighbor CLUSTER route-map NO-IN in
exit-address-family
!
address-family l2vpn evpn
neighbor fabric activate
neighbor fabric route-reflector-client
exit-address-family
!
exit
!
</pre></div>
</div>
<p>Ce qu’elle établit :</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><strong>Routeurs de cluster</strong> (groupe <code class="docutils literal notranslate"><span class="pre">CLUSTER</span></code>) : eBGP vers l’AS 65100, avec BFD, en IPv4
unicast. Le route reflector n’annonce que sa loopback (<code class="docutils literal notranslate"><span class="pre">RR-LOOPBACK-OUT</span></code>) et <strong>n’accepte
rien</strong> (<code class="docutils literal notranslate"><span class="pre">NO-IN</span></code>) : il ne reçoit aucune route des routeurs.</p></li>
<li><p><strong>Hyperviseurs</strong> (groupe <code class="docutils literal notranslate"><span class="pre">fabric</span></code>) : voisins dynamiques, toute session venant de
<code class="docutils literal notranslate"><span class="pre">192.168.14.0/24</span></code> étant acceptée, jusqu’à 200. <code class="docutils literal notranslate"><span class="pre">local-as</span> <span class="pre">64600</span> <span class="pre">no-prepend</span> <span class="pre">replace-as</span></code> fait
que, du point de vue des hyperviseurs, la session est en iBGP dans l’AS 64600 — celui de leur
configuration — alors que le route reflector est en AS 65000 face aux routeurs.</p></li>
<li><p><strong>EVPN</strong> : seule famille activée vers les hyperviseurs, qui sont ses clients
(<code class="docutils literal notranslate"><span class="pre">route-reflector-client</span></code>) : il réfléchit les routes EVPN de chacun vers tous les autres.</p></li>
</ul>
<div class="admonition warning">
<p class="admonition-title">Avertissement</p>
<p><strong>Les tunnels ne survivent pas à la perte du route reflector.</strong> Avec un seul route reflector
et sans <code class="docutils literal notranslate"><span class="pre">graceful-restart</span></code>, à l’arrêt de FRR sur le route reflector, la session EVPN des
hyperviseurs tombe aussitôt, FRR retire les routes apprises et, avec elles, le VTEP distant et l’entrée d’inondation du VXLAN — <strong>plus
aucun paquet ne passe</strong> entre hyperviseurs, à 30 s comme à 90 s. Au redémarrage de FRR sur le
route reflector, VTEP distant et trafic reviennent <strong>31 s</strong> plus tard. Le trafic entre VM d’un
même hyperviseur n’est pas concerné. La redondance (deux route reflectors) ou
<code class="docutils literal notranslate"><span class="pre">graceful-restart</span></code> sont les deux leviers ; ni l’un ni l’autre n’est encore qualifié.</p>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p><strong>À rédiger.</strong> Reste à documenter :</p>
<ul class="simple">
<li><p>la création de la VM : ressources, subnet et mode utilisés (<code class="docutils literal notranslate"><span class="pre">bridge</span></code>, pour pouvoir la
lancer sur n’importe quel hyperviseur), 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>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 de reconstruction — l’état du cluster pendant l’absence du route reflector est
décrit ci-dessus : plus de trafic entre hyperviseurs ;</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>
<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">
@ -437,6 +564,8 @@ même disque fait que cloud-init <strong>ne rejoue pas</strong> le user-data. Cf
</div>
<nav id="pst-page-toc-nav" class="page-toc" aria-labelledby="pst-page-navigation-heading-2">
<ul class="visible nav section-nav flex-column">
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#adressage">Adressage</a></li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#configuration-de-frr">Configuration de FRR</a></li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#points-de-vigilance">Points de vigilance</a></li>
</ul>
</nav></div>

View file

@ -218,6 +218,13 @@
</ul>
</details></li>
</ul>
<p aria-level="2" class="caption" role="heading"><span class="caption-text">Développement</span></p>
<ul class="nav bd-sidenav">
<li class="toctree-l1 has-children"><a class="reference internal" href="../developpement/index.html">Développement</a><details><summary><span class="toctree-toggle" role="presentation"><i class="fa-solid fa-chevron-down"></i></span></summary><ul>
<li class="toctree-l2"><a class="reference internal" href="../developpement/lab.html">Lab de test multi-nœud</a></li>
</ul>
</details></li>
</ul>
<p aria-level="2" class="caption" role="heading"><span class="caption-text">Interne</span></p>
<ul class="nav bd-sidenav">
<li class="toctree-l1 has-children"><a class="reference internal" href="../concepts/index.html">Concepts</a><details><summary><span class="toctree-toggle" role="presentation"><i class="fa-solid fa-chevron-down"></i></span></summary><ul>
@ -335,6 +342,11 @@
</div>
<nav aria-label="Page">
<ul class="visible nav section-nav flex-column">
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#routeur-de-cluster">Routeur de cluster</a><ul class="nav section-nav flex-column">
<li class="toc-h3 nav-item toc-entry"><a class="reference internal nav-link" href="#adressage">Adressage</a></li>
<li class="toc-h3 nav-item toc-entry"><a class="reference internal nav-link" href="#configuration-de-frr">Configuration de FRR</a></li>
</ul>
</li>
<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>
</ul>
</nav>
@ -361,20 +373,103 @@ données VXLAN.</p>
<dt>Routeurs de bordure</dt><dd><p>terminent le routage vers l’extérieur.</p>
</dd>
</dl>
<section id="routeur-de-cluster">
<h2>Routeur de cluster<a class="headerlink" href="#routeur-de-cluster" title="Lien vers cette rubrique">#</a></h2>
<p>Le routeur de cluster est la passerelle des hyperviseurs et le voisin eBGP du route reflector, dont
il apprend la loopback : c’est par lui que chaque hyperviseur joint <code class="docutils literal notranslate"><span class="pre">10.255.255.1</span></code> pour ouvrir sa
session EVPN (<a class="reference internal" href="route-reflector.html"><span class="doc">VM route reflector</span></a>).</p>
<section id="adressage">
<h3>Adressage<a class="headerlink" href="#adressage" title="Lien vers cette rubrique">#</a></h3>
<div class="pst-scrollable-table-container"><table class="table">
<colgroup>
<col style="width: 30.0%" />
<col style="width: 25.0%" />
<col style="width: 45.0%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>Adresse</p></th>
<th class="head"><p>Interface</p></th>
<th class="head"><p>Rôle</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">192.168.14.1/24</span></code></p></td>
<td><p>interface du segment des hyperviseurs</p></td>
<td><p>passerelle par défaut des hyperviseurs et du route reflector</p></td>
</tr>
<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">169.254.0.1/28</span></code></p></td>
<td><p>même interface, <strong>adresse secondaire</strong></p></td>
<td><p>lien avec le route reflector (<code class="docutils literal notranslate"><span class="pre">169.254.0.3</span></code>) ; <code class="docutils literal notranslate"><span class="pre">router-id</span></code> ; le second routeur prend
<code class="docutils literal notranslate"><span class="pre">169.254.0.2</span></code></p></td>
</tr>
</tbody>
</table>
</div>
<p>Le MTU minimal du segment, imposé par VXLAN, est donné plus bas.</p>
</section>
<section id="configuration-de-frr">
<h3>Configuration de FRR<a class="headerlink" href="#configuration-de-frr" title="Lien vers cette rubrique">#</a></h3>
<p><code class="docutils literal notranslate"><span class="pre">bgpd</span></code> et <code class="docutils literal notranslate"><span class="pre">bfdd</span></code> activés dans <code class="docutils literal notranslate"><span class="pre">/etc/frr/daemons</span></code>.</p>
<div class="highlight-text notranslate"><div class="highlight"><pre><span></span>frr defaults traditional
hostname sw1
log syslog informational
!
ip prefix-list RR-LOOPBACK-IN seq 10 permit 10.255.255.1/32
!
route-map RR-IN permit 10
match ip address prefix-list RR-LOOPBACK-IN
exit
!
route-map NO-OUT deny 999
exit
!
router bgp 65100
no bgp default ipv4-unicast
bgp router-id 169.254.0.1
neighbor 169.254.0.3 remote-as 65000
neighbor 169.254.0.3 description rr1
neighbor 169.254.0.3 bfd
!
address-family ipv4 unicast
neighbor 169.254.0.3 activate
neighbor 169.254.0.3 route-map RR-IN in
neighbor 169.254.0.3 route-map NO-OUT out
exit-address-family
!
exit
!
</pre></div>
</div>
<p>Ce qu’elle établit :</p>
<ul class="simple">
<li><p><strong>Route reflector</strong> : eBGP de l’AS 65100 vers l’AS 65000, avec BFD, en IPv4 unicast.</p></li>
<li><p><strong>En entrée</strong>, seule la loopback du route reflector est acceptée (<code class="docutils literal notranslate"><span class="pre">RR-IN</span></code>) ; <strong>en sortie</strong>,
rien n’est annoncé (<code class="docutils literal notranslate"><span class="pre">NO-OUT</span></code>). Symétrique de <code class="docutils literal notranslate"><span class="pre">RR-LOOPBACK-OUT</span></code> et <code class="docutils literal notranslate"><span class="pre">NO-IN</span></code> côté route
reflector : chaque côté filtre, aucun ne dépend du filtre de l’autre.</p></li>
<li><p><strong>Aucune session avec les hyperviseurs</strong> : le routeur leur sert de passerelle, pas de voisin BGP.</p></li>
</ul>
<p>Le route reflector déclare aussi le second routeur (<code class="docutils literal notranslate"><span class="pre">169.254.0.2</span></code>). La redondance est l’objet de
<a class="reference external" href="https://git.g3e.fr/syonad/two/issues/54">#54</a>.</p>
<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>
<p>Ce qui précède est le contrat du routeur de cluster : adresses, ASN, session, filtres. Sa
traduction dans la configuration d’un constructeur n’a pas sa place ici.</p>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p><strong>À rédiger.</strong> Reste à documenter, faute d’éléments de terrain :</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>pour le routeur de cluster : le matériel employé et sa version de référence ; la redondance
— deux routeurs, mécanisme de bascule, comportement attendu pendant une bascule
(<a class="reference external" href="https://git.g3e.fr/syonad/two/issues/54">#54</a>) ;</p></li>
<li><p>pour les routeurs de datacentre et de bordure : tout — équipement, configuration de
référence, ce qui est annoncé et filtré à chaque niveau, redondance ;</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>
</section>
<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>
@ -445,6 +540,11 @@ joignable que depuis le réseau d’administration. Cf. <a class="reference inte
</div>
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<li class="toc-h3 nav-item toc-entry"><a class="reference internal nav-link" href="#adressage">Adressage</a></li>
<li class="toc-h3 nav-item toc-entry"><a class="reference internal nav-link" href="#configuration-de-frr">Configuration de FRR</a></li>
</ul>
</li>
<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>
</ul>
</nav></div>

View file

@ -0,0 +1,443 @@
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<h1>Développement<a class="headerlink" href="#developpement" title="Lien vers cette rubrique">#</a></h1>
<p>Outillage réservé au développement de two : il ne s’installe sur aucun hyperviseur et ne sert
pas à exploiter un cluster.</p>
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</script>
<link rel="index" title="Index" href="../genindex.html" />
<link rel="search" title="Recherche" href="../search.html" />
<link rel="next" title="Concepts" href="../concepts/index.html" />
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<meta name="viewport" content="width=device-width, initial-scale=1"/>
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@ -218,6 +218,13 @@
</ul>
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<li class="toctree-l1 has-children"><a class="reference internal" href="../developpement/index.html">Développement</a><details><summary><span class="toctree-toggle" role="presentation"><i class="fa-solid fa-chevron-down"></i></span></summary><ul>
<li class="toctree-l2"><a class="reference internal" href="../developpement/lab.html">Lab de test multi-nœud</a></li>
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@ -496,11 +503,11 @@ l’agent n’est plus piloté par lui.</p>
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</ul>
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<p aria-level="2" class="caption" role="heading"><span class="caption-text">Développement</span></p>
<ul class="nav bd-sidenav">
<li class="toctree-l1 has-children"><a class="reference internal" href="developpement/index.html">Développement</a><details><summary><span class="toctree-toggle" role="presentation"><i class="fa-solid fa-chevron-down"></i></span></summary><ul>
<li class="toctree-l2"><a class="reference internal" href="developpement/lab.html">Lab de test multi-nœud</a></li>
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@ -395,6 +402,8 @@ qu’un parc d’hyperviseurs fonctionne ensemble.</p>
</dd>
<dt><a class="reference internal" href="exploitation/index.html"><span class="doc">Exploitation</span></a></dt><dd><p>Configuration, services, API de l’agent, métriques et diagnostic sur un nœud en service.</p>
</dd>
<dt><a class="reference internal" href="developpement/index.html"><span class="doc">Développement</span></a></dt><dd><p>Outillage de développement de two, dont le lab de test multi-nœud sur serveur loué à l’heure.</p>
</dd>
<dt><a class="reference internal" href="concepts/index.html"><span class="doc">Concepts</span></a></dt><dd><p>Comment les éléments fonctionnent entre eux : modèle de données, modes réseau, cycle de vie,
metadata. À lire avant de diagnostiquer un comportement inattendu.</p>
</dd>
@ -405,6 +414,8 @@ metadata. À lire avant de diagnostiquer un comportement inattendu.</p>
</div>
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@ -218,6 +218,13 @@
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