Two independent bugs, both silent, both found while pointing an agent harness
at api.riotpiao.com.
1. Requests over ~10.6KB failed with HTTP 400
{"error":{"message":"[] is too short - 'messages'"}}.
The request-transformer plugin on the llm-chat-* routes rewrites the JSON
body, which means it reads it via kong.request.get_body(). That returns
nothing once nginx spills the body past client_body_buffer_size into a temp
file, so the plugin re-serialized a body with no `messages` and the upstream
rejected it. Measured on /v1/ornith/chat/completions: 10588 B -> 200,
11088 B -> 400. Isolated by size-sweeping /v1/embeddings, the one route with
no request-transformer, which passed an 18057 B body straight through to a
semantic 413 from TEI.
Raises the Kong http-block buffer to 16m. Any agent request carrying tool
schemas clears the old ceiling in a single turn.
2. key-auth was never applied to any model route.
The model-key-auth KongPlugin sat in namespace `api` while all five routes
that annotate it live in `llm-serving`. The ingress controller resolves
konghq.com/plugins against the annotated object's own namespace, so the
reference dangled and the plugin never bound. Verified before the fix:
unauthenticated GET /v1/models and POST /v1/ornith/chat/completions both
returned 200. A dangling plugin reference fails open and logs nothing.
Re-test both without a key after this syncs; expect 401.
Note for follow-up: llm-embeddings and llm-score carry no plugins annotation at
all, so they stay unauthenticated even after this change.
Co-Authored-By: Claude Opus 5 <[email protected]>
llm-serving-default-deny admits port 8080 only from pods carrying
llm-client=true. Kong lacked it, so every route that actually contacts an
upstream timed out. /v1/models masked the problem: request-termination answers
inside Kong and never touches an upstream, so it returned 200 throughout.
Opting in via podLabels rather than relaxing the policy — it is a compensating
control, not hygiene, since vLLM v0.11.0 is frozen on Volta and will not receive
patches for several remote/unauthenticated advisories.
podLabels land only in the pod template, not spec.selector.matchLabels, so this
is not an immutable-field change.
Kong matches routes on host/path/method/header, never on the request body, so a
single /v1/chat/completions dispatching on body.model is not expressible in Kong
OSS (ai-proxy-advanced, which does multi-target model routing, is Enterprise).
Model therefore goes in the path:
GET /v1/models static list (request-termination)
POST /v1/reasoning/chat/completions reasoning-predictor (vLLM)
POST /v1/ornith/chat/completions ornith-predictor (Ollama)
POST /v1/qwen/chat/completions ornith-predictor (Ollama, same pod)
POST /v1/embeddings embeddings-predictor (TEI)
POST /v1/rerank reranker-predictor (TEI)
POST /v1/score verifier-predictor (vLLM pooling)
- each chat route force-overwrites body.model via request-transformer add+replace:
ornith:35b and qwen2.5:3b-instruct share one Ollama pod, so without this a
client hitting /v1/qwen with "model":"ornith:35b" would silently get the 35B
- routes live in ns llm-serving, not api: an Ingress can only reference a Service
in its own namespace, and KIC watches all namespaces
- embeddings and score need no rewrite (TEI/vLLM already serve the canonical
paths); rerank does, since /v1/rerank 404s and only /rerank exists
- read/write timeouts 1h: Kong defaults to 60s, which a 32B model on Volta
exceeds mid-generation and returns 504
- nginx_proxy_proxy_buffering=off: buffered responses lump or stall SSE, and both
hops (nginx Ingress and Kong) must be unbuffered or the buffered one wins
- no auth for now, per decision; api.riotpiao.com is reachable through nginx, so
GPU time is currently unauthenticated
