Make the cluster topology configurable so an adopter wired differently
(vLLM on both Sparks, port 8000, different container name, no Parakeet)
can monitor without forking. Covers the OpenClaw report P4/P5/#6.
- VLLM_CONTAINER override (default vllm_node), validated at the boundary
and quote_arg-quoted into the swap log-tail + pre-flight validator exec.
- DISABLED_SERVICES list: hidden services show no tile and are skipped by
status/deep-health/connectivity probes (kills the Parakeet-on-8000
collision).
- kind: vllm custom service monitors a second Spark's vLLM via the shared
probe_vllm_endpoint; /api/endpoints gains a disabled flag.
Swap mechanism intentionally not generalized to raw docker run (that's
coordination, roadmap item 4).
validate.py:
- Builds the same args list a real swap would pass to 'vllm serve'
- SSHes into Spark 1 and runs vLLM's own argparse layer inside the running vllm_node container, WITHOUT initializing the engine
- Uses FlexibleArgumentParser (from vllm.utils.argparse_utils, with fallback to engine.arg_utils) + make_arg_parser — the exact same parser the 'vllm serve' CLI uses. Earlier attempt with bare argparse.ArgumentParser was too strict (rejected '--moe_backend' with underscore that the real CLI accepts via FlexibleArgumentParser's normalization)
- Returns structured {ok, stage, error, cmd_args, launch_cmd} so the UI can surface the exact failure cause
Endpoint: POST /api/swap/{key}/validate. Cheap (~5s), no engine init, no disruption to the currently-loaded model.
Frontend: 'Test' button on every model card, inline result below the action row (green check or red detailed error). Result stays visible until the user reloads or clicks Test again.
Catches: typos in flag names, deprecated/removed flags after a vLLM upgrade, type mismatches. Does NOT catch runtime-only failures (Mamba block-size assertion, OOM at load, kernel-compat). Ok=true is necessary-but-not-sufficient; ok=false is definitive 'don't bother running it'.
Keysat