StatefulSet — Database Cluster

Headless service + StatefulSet with ordered pods and persistent volumes.

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digraph sts {
  rankdir=LR;
  graph [bgcolor=transparent];
  node [shape=box, style="rounded,filled", fontname=Inter, fontsize=10];

  HS [label="Headless Service\n(db.default.svc)", fillcolor="#dbeafe"];
  P0 [label="pod db-0\n(primary)", fillcolor="#fce7f3"];
  P1 [label="pod db-1\n(replica)"];
  P2 [label="pod db-2\n(replica)"];
  V0 [label="PVC data-db-0", shape=cylinder, fillcolor="#fef3c7"];
  V1 [label="PVC data-db-1", shape=cylinder, fillcolor="#fef3c7"];
  V2 [label="PVC data-db-2", shape=cylinder, fillcolor="#fef3c7"];

  HS -> P0; HS -> P1; HS -> P2;
  P0 -> V0; P1 -> V1; P2 -> V2;
  P0 -> P1 [label="replicate", style=dashed];
  P0 -> P2 [label="replicate", style=dashed];
}