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master-zapier-plan-draft/docs/02-architecture/fleet.md
George Lambert e89e006542
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Control remote fleet workers over SSH with user, host, and key path 
NS1 is marchon@70.88.205.138 using ~/.ssh/id_ed25519. Private key
bytes stay off git. Spawn, health, and kill go through ssh; remote
workers bind loopback only.
2026-09-11 13:31:21 -04:00

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Fleet: replica floors, monitor, pause, restart

Runtime copies of middleware workers, WORM archives, and tree nodes are declared in packages/verae-fleet/fleet.json (how many) and packages/verae-fleet/services/*.json (how each one runs).

operator  --HTTP 127.0.0.1:3850-->  fleet control
                                      | spawn workers with /health
          tree-node min=3 keepFloor   |
          archive-worm min=3          |
          paused ≠ available          |
          unhealthy → restart         v
                               replicas on loopback health ports
  • list — node src/cli.js list
  • monitor — serve probes /health and reconciles
  • restart — crash or 503 → same instance id respawned
  • pause / off — pause does not count toward min; keepFloor starts another tree-node. stop on a service disables it.
  • tree-node floor — fleet.json tree-node.min (default 3). Do not drop this without changing the spec; bulk-summary leaf queries need several bloom-filtered nodes.

Extra machines

Define hosts in packages/verae-fleet/machines.json (or Add machine on the monitor). Each machine has capacity and roles it may run. The supervisor places new replicas on the least-loaded eligible host.

  • kind: local — spawn on the control plane.
  • kind: ssh — user@host with identityFile (path only, e.g. ~/.ssh/id_ed25519). Control plane scps the worker and sshes spawn/kill/health. Workers stay on 127.0.0.1 on the remote host; NATS is not published.
  • kind: agent — HTTP to http://host:agentPort (node src/agent.js on that box).

Override credentials in gitignored machines.secrets.json (see machines.secrets.json.example). Never put private-key bytes in git.

node src/cli.js ssh-check ns1 verifies login as marchon@70.88.205.138.

Raising tree-node.max and adding machines increases bulk-summary lookup capacity.

Message RTT (planning)

The monitor samples POST /message on each healthy replica and shows min / avg / p50 / p90 milliseconds of message processing (service row, instance, and machine). Use p90 when sizing extra tree nodes.

Zapier cloud is not spawned. NATS is monitored, not bound publicly.