Hermes Agent service account 60220e18b6 feat(astro-orbiter): add deploy-vllm Ansible role (t_ca1af9fb) ...

Idempotent vLLM OpenAI-compatible serving role, staged-first (does not
start/enable the systemd unit or touch production traffic by default).
Validated end-to-end against astro-orbiter in a brief shadow window
(llama-swap stopped ~5 min, per homelab-llm-inference skill's documented
shadow-validation pattern):
  - /health 200, /v1/models returns Qwen2.5-32B-Instruct-AWQ,
    /v1/completions live smoke test passes, clean journalctl
  - 3 consecutive full-role runs confirmed changed=0 (idempotent)
  - production restored: llama-swap active, /v1/embeddings against
    nomic-embed-text-v1.5 confirmed still working (Hindsight retain path)

Deviates from the original spec's model choices (Qwen2.5-32B-Instruct /
Qwen3-8B-Instruct bf16) to use the official Qwen AWQ pre-quantized variants
instead -- vLLM does not do safe on-the-fly quantization on this host
(bitsandbytes OOM history) and unquantized bf16 32B does not fit 24GB VRAM.

Two real bugs found+fixed during first-start validation (systemd-only
repro, not visible via interactive SSH testing):
  1. ninja not on systemd's minimal PATH -> vLLM torch.compile
     FileNotFoundError. Fixed via explicit PATH env in the unit.
  2. FlashInfer sampler JIT fails to compile on RTX 3090 (SM86) --
     known upstream issue class (vLLM GH #23023, #44305). Fixed via
     VLLM_USE_FLASHINFER_SAMPLER=0 (falls back to native sampler).

Also fixed a real idempotency bug: force-upgrading setuptools to latest
fought with vLLM's own setuptools<81.0.0 pin, causing an install/downgrade
flip-flop (changed:true) on every run.

vllm_service_enabled defaults to false -- a host reboot must not
auto-start vLLM and VRAM-collide with the still-live llama-swap production
service. Cutover (enabling + starting + migrating consumers) is an
explicit, separate step outside this role, gated on adding embedding-mode
support (--task embed) for nomic-embed-text-v1.5, which this role does
not yet implement (Hindsight retain still depends on llama-swap's
nomic-embed until that follow-up lands).

Role: roles/deploy-vllm/ (defaults/handlers/meta/tasks/templates/README)
Playbook: playbooks/day1_deploy_vllm.yml

2026-08-31 17:37:37 -05:00

566 B

Raw Blame History

View Raw