nordisk/gunnar

assets/gunnar-twin.svg

<svg xmlns="http://www.w3.org/2000/svg" width="735" height="578" viewBox="0 0 735 578" font-family="monospace" font-size="13">
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       every arrow starts on the box the verb is typed against, and moving a line
       instead of the model is how a diagram starts telling an operator to run
       `promote` on the wrong machine. -->
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  <text x="16" y="28" class="hdr">gunnar-twin · main + twin, paired by the door</text>
  <text x="16" y="50" class="dim">both boxes boot the same medium and join the front's door; the door elects the twin</text>
  <g transform="translate(-304 -6)">
  <text x="320" y="82" class="kick">vm1</text>
  <rect class="box" x="320" y="90" width="680" height="90" fill="#2a2438" stroke="#9a7fc0"/>
  <text x="332" y="114" class="name">front</text>
  <text x="332" y="134" class="dim">door :8474 · mutual TLS · elects the twin</text>
  <text x="332" y="151" class="dim">relay :51820 · clock :50123 · gunnar-ui</text>
  <text x="320" y="282" class="kick">vm2</text>
  <rect class="box" x="320" y="290" width="280" height="108" fill="#123448" stroke="#4f9ec0"/>
  <text x="332" y="314" class="name">main</text>
  <text x="332" y="334" class="dim">writable — clients push here</text>
  <text x="332" y="351" class="dim">git-ssh :2222 · control :50051</text>
  <text x="332" y="368" class="dim">primary, by the door's vote</text>
  <text x="720" y="282" class="kick">vm3</text>
  <rect class="box" x="720" y="290" width="280" height="108" fill="#233a2b" stroke="#4fae76"/>
  <text x="732" y="314" class="name">twin</text>
  <text x="732" y="334" class="dim">the SAME medium as main</text>
  <text x="732" y="351" class="dim">follows the primary's log</text>
  <text x="732" y="368" class="dim">the weaker box, by the door</text>
  <text x="320" y="444" class="kick">the installer</text>
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  <text x="332" y="476" class="name">one medium</text>
  <text x="332" y="496" class="dim">the door's address + the installer CA</text>
  <text x="332" y="513" class="dim">the SAME bytes on every box</text>
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  <text x="530" y="421" text-anchor="start" class="verb" fill="#6fd3f5">boots</text>
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  <text x="930" y="421" text-anchor="start" class="verb" fill="#6fd3f5">boots</text>
  <text x="930" y="436" text-anchor="start" class="note">the same bytes</text>
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  <text x="390" y="231" text-anchor="start" class="verb" fill="#6fd3f5">join :8474</text>
  <text x="390" y="246" text-anchor="start" class="note">mTLS</text>
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  <text x="790" y="231" text-anchor="start" class="verb" fill="#6fd3f5">join :8474</text>
  <text x="790" y="246" text-anchor="start" class="note">mTLS</text>
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  <text x="660" y="313" text-anchor="middle" class="verb" fill="#6fd3f5">follows</text>
  <text x="660" y="335" text-anchor="middle" class="note">in the tunnel</text>
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  <text x="16" y="548" class="dim">open: does gunnar-twin keep vm1 for the door, or does the door move onto a box?</text>
  <text x="16" y="564" class="dim">where = kvm | upcloud — the same install, so the same picture</text>
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