nordisk/gunnar

assets/gunnar-setup-3.svg

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  <!-- GENERATED by `cargo xtask svg` from xtask/src/setup_svg.rs. Do not hand-edit:
       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">§3 · a twin, and the two flips</text>
  <text x="16" y="50" class="dim">configure, backfill, and — one day — flip: the green arrows change which box is writable</text>
  <g transform="translate(-176.99 -130)">
  <text x="300" y="206" class="kick">the main device</text>
  <rect class="box" x="300" y="214" width="280" height="120" fill="#123448" stroke="#4f9ec0"/>
  <text x="312" y="238" class="name">primary appliance</text>
  <text x="312" y="258" class="dim">writable — clients push here</text>
  <text x="312" y="275" class="dim">git-ssh :2222 · control :50051</text>
  <text x="312" y="292" class="dim">/data survives a reinstall</text>
  <text x="740" y="206" class="kick">the second speaker</text>
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  <text x="752" y="238" class="name">twin (standby)</text>
  <text x="752" y="258" class="dim">a full gunnar, read-only</text>
  <text x="752" y="275" class="dim">takes the main's pushes</text>
  <text x="752" y="292" class="dim">can be promoted</text>
  <text x="740" y="398" class="kick">the rear speaker</text>
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  <text x="752" y="430" class="name">browse replica</text>
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  <text x="752" y="467" class="dim">never promoted</text>
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  <text x="660" y="237" text-anchor="middle" class="verb" fill="#6fd3f5">replication add</text>
  <text x="660" y="259" text-anchor="middle" class="note">&lt;name&gt; ssh://…:2222</text>
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  <text x="660" y="285" text-anchor="middle" class="verb" fill="#6fd3f5">resync</text>
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  <text x="660" y="323" text-anchor="middle" class="verb" fill="#4fae76">promote</text>
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  <text x="730" y="425" text-anchor="end" class="verb" fill="#6fd3f5">replication add --scope public-only</text>
  <text x="730" y="440" text-anchor="end" class="note">--control &lt;replica&gt;:50051</text>
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  <text x="316" y="382" text-anchor="end" class="verb" fill="#4fae76">abdicate / demote</text>
  <text x="316" y="397" text-anchor="end" class="note">on the old main</text>
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  <text x="16" y="386" class="dim">`promote` on the twin, `abdicate`/`demote` on the old main — never both on one box</text>
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