Slurm's accounting: slurmdbd and a MariaDB on the controller

Since 23.11 Slurm runs badly without accounting storage: the main
scheduler passes every job by as InvalidAccount. slurmdbd takes MySQL or
MariaDB only, so the controller's agent installs MariaDB beside it,
answering that machine alone, makes the database and its user (the
password made from the munge key, never on a command line), runs
slurmdbd and adds the cluster, all before slurmctld. A MariaDB that was
on the machine before keeps its settings. slurm.conf accounts the jobs
there, with what each used from its cgroup and the cards, and the
priority is multifactor again. Port 6819 joins Slurm's in the firewall.
ctl slurm status and the console say whether slurmdbd runs; the install
screen, server init --slurm and the guide say what is put where.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/admin-api.openapi.json

@@ -12246,6 +12246,9 @@
           "slurmctld_running": {
             "type": "boolean"
           },
+          "slurmdbd_running": {
+            "type": "boolean"
+          },
           "state": {
             "type": "string"
           },