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Author: yanncaniouoracle

cloud-infrastructure/ai-infra-gpu/ai-infrastructure/litellm/README.md

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+# Calling multiple vLLM inference servers using LiteLLM
+
+In this tutorial we explain how to use a LiteLLM Proxy Server to call multiple LLM inference endpoints from a single interface. LiteLLM interacts will 100+ LLMs such as OpenAI, Coheren, NVIDIA Triton and NIM, etc. Here we will use two vLLM inference servers.
+
+## Introduction
+
+LiteLLM provides a proxy server to manage auth, loadbalancing, and spend tracking across 100+ LLMs. All in the OpenAI format.
+vLLM is a fast and easy-to-use library for LLM inference and serving.
+The first step will be to deploy two vLLM inference servers on NVIDIA A10 powered virtual machine instances. In the second step, we will create a LiteLLM Proxy Server on a third no-GPU instance and explain how we can use this interface to call the two LLM from a single location. For the sake of silplicity, all 3 instances will reside in the same public subnet here.
+
+## vLLM inference servers deployment
+
+For each of the inference servers nodes a VM.GPU.A10.2 instance (2 x NVIDIA A10 GPU 24GB) is used in combination with the NVIDIA GPU-Optimized VMI image from the OCI marketplace. This Ubuntu-based image comes with all the necessary libraries (Docker, NVIDIA Container Toolkit) preinstalled.
+The vLLM inference server is deployed using the vLLM official container image.
+```
+docker run --gpus all \
+    -e HF_TOKEN=$HF_TOKEN -p 8000:8000 \
+    --ipc=host \
+    vllm/vllm-openai:latest \
+    --host 0.0.0.0 \
+    --port 8000 \
+    --model mistralai/Mistral-7B-Instruct-v0.3 \
+    --tensor-parallel-size 2 \
+    --load-format safetensors \
+    --trust-remote-code \
+    --enforce-eager
+```
+where `$HF_TOKEN` is a valid HuggingFace token. In this case we use the 7B Instruct version of Mistral LLM. The vLLM endpoint can be directly called for verification with:
+```
+curl http://localhost:8000/v1/chat/completions \
+    -H "Content-Type: application/json" \
+    -d '{
+        "model": "mistralai/Mistral-7B-Instruct-v0.3",
+        "messages": [
+            {"role": "user", "content": "Who won the world series in 2020?"}
+        ]
+    }' | jq
+```
+
+## LiteLLM server deployment
+
+No GPU are required for LiteLLM. Therefore, a CPU based VM.Standard.E4.flex instance (4 OCPUs, 64 GB Memory) with a standard Ubuntu 22.04 image is used. Here LiteLLM is used as a proxy server calling a vLLM endpoint. Install LiteLLM using `pip`:
+```
+pip install 'litellm[proxy]'
+```
+Edit the `config.yaml` file (OpenAI-Compatible Endpoint):
+```
+model_list:
+  - model_name: Mistral-7B-Instruct
+    litellm_params:
+      model: openai/mistralai/Mistral-7B-Instruct-v0.3
+      api_base: http://public_ip_1:8000/v1
+      api_key: sk-0123456789
+  - model_name: Mistral-7B-Instruct
+    litellm_params:
+      model: openai/mistralai/Mistral-7B-Instruct-v0.3
+      api_base: http://public_ip_2:8000/v1
+      api_key: sk-0123456789
+```
+where `sk-0123456789` is a valid OpenAI API key and `public_ip_1` and `public_ip_2` are the two GPU instances public IP addresses.
+
+Start the LiteLLM Proxy Server with the following command:
+```
+litellm --config /path/to/config.yaml
+```
+Once the the Proxy Server is ready call the vLLM endpoint through LiteLLM with:
+```
+curl http://localhost:4000/chat/completions \
+    -H 'Authorization: Bearer sk-0123456789' \
+    -H "Content-Type: application/json" \
+    -d '{
+        "model": "Mistral-7B-Instruct",
+        "messages": [
+            {"role": "user", "content": "Who won the world series in 2020?"}
+        ]
+    }' | jq
+```
+
+## Useful links
+
+* [LiteLLM documentation](https://litellm.vercel.app/docs/providers/openai_compatible)
+* [vLLM documentation](https://docs.vllm.ai/en/latest/serving/deploying_with_docker.html)
+* [MistralAI](https://mistral.ai/)

cloud-infrastructure/ai-infra-gpu/ai-infrastructure/litellm/config.yaml

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+model_list:
+  - model_name: Mistral-7B-Instruct
+    litellm_params:
+      model: openai/mistralai/Mistral-7B-Instruct-v0.3
+      api_base: http://public_ip_1:8000/v1
+      api_key: sk-0123456789
+  - model_name: Mistral-7B-Instruct
+    litellm_params:
+      model: openai/mistralai/Mistral-7B-Instruct-v0.3
+      api_base: http://public_ip_2:8000/v1
+      api_key: sk-0123456789