Scaling Distributed Inference for Large Language Models Using Ray and Kubernetes Orchestration
Table of Contents Introduction Why Inference at Scale Is Hard Ray: A Unified Engine for Distributed Compute Kubernetes: The De‑Facto Orchestrator for Cloud‑Native Workloads Architectural Blueprint 5.1 Model Sharding and Parallelism 5.2 Ray Serve as the Inference Service Layer 5.3 Kubernetes Pods as Ray Workers Step‑by‑Step Deployment Guide 6.1 Containerizing the Model 6.2 Defining the Ray Cluster on Kubernetes 6.3 Serving the Model with Ray Serve Scaling Strategies 7.1 Horizontal Pod Autoscaling (HPA) 7.2 Ray Placement Groups for Resource Guarantees 7.3 Dynamic Actor Scaling Performance Optimizations 8.1 Batching Requests 8.2 Quantization & Mixed‑Precision 8.3 Cache‑Aware Scheduling Monitoring, Logging, and Observability Real‑World Case Study: Chatbot‑as‑a‑Service for a FinTech Platform 11 Best Practices Checklist 12 Conclusion 13 Resources Introduction Large language models (LLMs) such as GPT‑3, Llama‑2, and Claude have reshaped the AI landscape, delivering unprecedented capabilities in natural language understanding and generation. While training these models demands massive GPU clusters and weeks of compute, inference—the stage where end‑users actually interact with the model—poses its own set of scalability challenges. A single request to a 70 B‑parameter LLM can consume multiple gigabytes of GPU memory and tens of milliseconds of compute, and production workloads often demand thousands of concurrent requests with low latency. ...