545 lines
22 KiB
Markdown
545 lines
22 KiB
Markdown
# LightRAG Server and WebUI
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The LightRAG Server is designed to provide a Web UI and API support. The Web UI facilitates document indexing, knowledge graph exploration, and a simple RAG query interface. LightRAG Server also provides an Ollama-compatible interface, aiming to emulate LightRAG as an Ollama chat model. This allows AI chat bots, such as Open WebUI, to access LightRAG easily.
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## Getting Started
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### Installation
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* Install from PyPI
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```bash
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pip install "lightrag-hku[api]"
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```
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* Installation from Source
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```bash
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# Clone the repository
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git clone https://github.com/HKUDS/lightrag.git
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# Change to the repository directory
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cd lightrag
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# create a Python virtual environment if necessary
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# Install in editable mode with API support
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pip install -e ".[api]"
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```
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### Before Starting LightRAG Server
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LightRAG necessitates the integration of both an LLM (Large Language Model) and an Embedding Model to effectively execute document indexing and querying operations. Prior to the initial deployment of the LightRAG server, it is essential to configure the settings for both the LLM and the Embedding Model. LightRAG supports binding to various LLM/Embedding backends:
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* ollama
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* lollms
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* openai or openai compatible
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* azure_openai
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It is recommended to use environment variables to configure the LightRAG Server. There is an example environment variable file named `env.example` in the root directory of the project. Please copy this file to the startup directory and rename it to `.env`. After that, you can modify the parameters related to the LLM and Embedding models in the `.env` file. It is important to note that the LightRAG Server will load the environment variables from `.env` into the system environment variables each time it starts. Since the LightRAG Server will prioritize the settings in the system environment variables, if you modify the `.env` file after starting the LightRAG Server via the command line, you need to execute `source .env` to make the new settings take effect.
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Here are some examples of common settings for LLM and Embedding models:
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* OpenAI LLM + Ollama Embedding:
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```
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LLM_BINDING=openai
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LLM_MODEL=gpt-4o
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LLM_BINDING_HOST=https://api.openai.com/v1
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LLM_BINDING_API_KEY=your_api_key
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### Max tokens sent to LLM (less than model context size)
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MAX_TOKENS=32768
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EMBEDDING_BINDING=ollama
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EMBEDDING_BINDING_HOST=http://localhost:11434
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EMBEDDING_MODEL=bge-m3:latest
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EMBEDDING_DIM=1024
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# EMBEDDING_BINDING_API_KEY=your_api_key
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```
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* Ollama LLM + Ollama Embedding:
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```
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LLM_BINDING=ollama
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LLM_MODEL=mistral-nemo:latest
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LLM_BINDING_HOST=http://localhost:11434
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# LLM_BINDING_API_KEY=your_api_key
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### Max tokens sent to LLM (based on your Ollama Server capacity)
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MAX_TOKENS=8192
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EMBEDDING_BINDING=ollama
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EMBEDDING_BINDING_HOST=http://localhost:11434
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EMBEDDING_MODEL=bge-m3:latest
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EMBEDDING_DIM=1024
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# EMBEDDING_BINDING_API_KEY=your_api_key
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```
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### Starting LightRAG Server
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The LightRAG Server supports two operational modes:
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* The simple and efficient Uvicorn mode:
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```
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lightrag-server
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```
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* The multiprocess Gunicorn + Uvicorn mode (production mode, not supported on Windows environments):
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```
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lightrag-gunicorn --workers 4
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```
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The `.env` file **must be placed in the startup directory**.
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Upon launching, the LightRAG Server will create a documents directory (default is `./inputs`) and a data directory (default is `./rag_storage`). This allows you to initiate multiple instances of LightRAG Server from different directories, with each instance configured to listen on a distinct network port.
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Here are some commonly used startup parameters:
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- `--host`: Server listening address (default: 0.0.0.0)
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- `--port`: Server listening port (default: 9621)
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- `--timeout`: LLM request timeout (default: 150 seconds)
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- `--log-level`: Logging level (default: INFO)
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- `--input-dir`: Specifying the directory to scan for documents (default: ./inputs)
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> The requirement for the .env file to be in the startup directory is intentionally designed this way. The purpose is to support users in launching multiple LightRAG instances simultaneously, allowing different .env files for different instances.
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### Auto scan on startup
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When starting any of the servers with the `--auto-scan-at-startup` parameter, the system will automatically:
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1. Scan for new files in the input directory
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2. Index new documents that aren't already in the database
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3. Make all content immediately available for RAG queries
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> The `--input-dir` parameter specifies the input directory to scan. You can trigger the input directory scan from the Web UI.
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### Multiple workers for Gunicorn + Uvicorn
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The LightRAG Server can operate in the `Gunicorn + Uvicorn` preload mode. Gunicorn's multiple worker (multiprocess) capability prevents document indexing tasks from blocking RAG queries. Using CPU-exhaustive document extraction tools, such as docling, can lead to the entire system being blocked in pure Uvicorn mode.
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Though LightRAG Server uses one worker to process the document indexing pipeline, with the async task support of Uvicorn, multiple files can be processed in parallel. The bottleneck of document indexing speed mainly lies with the LLM. If your LLM supports high concurrency, you can accelerate document indexing by increasing the concurrency level of the LLM. Below are several environment variables related to concurrent processing, along with their default values:
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```
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### Number of worker processes, not greater than (2 x number_of_cores) + 1
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WORKERS=2
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### Number of parallel files to process in one batch
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MAX_PARALLEL_INSERT=2
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### Max concurrent requests to the LLM
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MAX_ASYNC=4
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```
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### Install LightRAG as a Linux Service
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Create your service file `lightrag.service` from the sample file: `lightrag.service.example`. Modify the `WorkingDirectory` and `ExecStart` in the service file:
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```text
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Description=LightRAG Ollama Service
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WorkingDirectory=<lightrag installed directory>
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ExecStart=<lightrag installed directory>/lightrag/api/lightrag-api
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```
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Modify your service startup script: `lightrag-api`. Change your Python virtual environment activation command as needed:
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```shell
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#!/bin/bash
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# your python virtual environment activation
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source /home/netman/lightrag-xyj/venv/bin/activate
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# start lightrag api server
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lightrag-server
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```
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Install LightRAG service. If your system is Ubuntu, the following commands will work:
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```shell
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sudo cp lightrag.service /etc/systemd/system/
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sudo systemctl daemon-reload
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sudo systemctl start lightrag.service
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sudo systemctl status lightrag.service
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sudo systemctl enable lightrag.service
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```
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## Ollama Emulation
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We provide Ollama-compatible interfaces for LightRAG, aiming to emulate LightRAG as an Ollama chat model. This allows AI chat frontends supporting Ollama, such as Open WebUI, to access LightRAG easily.
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### Connect Open WebUI to LightRAG
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After starting the lightrag-server, you can add an Ollama-type connection in the Open WebUI admin panel. And then a model named `lightrag:latest` will appear in Open WebUI's model management interface. Users can then send queries to LightRAG through the chat interface. You should install LightRAG as a service for this use case.
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Open WebUI uses an LLM to do the session title and session keyword generation task. So the Ollama chat completion API detects and forwards OpenWebUI session-related requests directly to the underlying LLM. Screenshot from Open WebUI:
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### Choose Query mode in chat
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The default query mode is `hybrid` if you send a message (query) from the Ollama interface of LightRAG. You can select query mode by sending a message with a query prefix.
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A query prefix in the query string can determine which LightRAG query mode is used to generate the response for the query. The supported prefixes include:
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```
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/local
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/global
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/hybrid
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/naive
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/mix
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/bypass
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/context
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/localcontext
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/globalcontext
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/hybridcontext
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/naivecontext
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/mixcontext
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```
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For example, the chat message `/mix What's LightRAG?` will trigger a mix mode query for LightRAG. A chat message without a query prefix will trigger a hybrid mode query by default.
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`/bypass` is not a LightRAG query mode; it will tell the API Server to pass the query directly to the underlying LLM, including the chat history. So the user can use the LLM to answer questions based on the chat history. If you are using Open WebUI as a front end, you can just switch the model to a normal LLM instead of using the `/bypass` prefix.
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`/context` is also not a LightRAG query mode; it will tell LightRAG to return only the context information prepared for the LLM. You can check the context if it's what you want, or process the context by yourself.
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## API Key and Authentication
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By default, the LightRAG Server can be accessed without any authentication. We can configure the server with an API Key or account credentials to secure it.
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* API Key:
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```
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LIGHTRAG_API_KEY=your-secure-api-key-here
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WHITELIST_PATHS=/health,/api/*
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```
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> Health check and Ollama emulation endpoints are excluded from API Key check by default.
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* Account credentials (the Web UI requires login before access can be granted):
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LightRAG API Server implements JWT-based authentication using the HS256 algorithm. To enable secure access control, the following environment variables are required:
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```bash
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# For jwt auth
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AUTH_ACCOUNTS='admin:admin123,user1:pass456'
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TOKEN_SECRET='your-key'
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TOKEN_EXPIRE_HOURS=4
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```
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> Currently, only the configuration of an administrator account and password is supported. A comprehensive account system is yet to be developed and implemented.
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If Account credentials are not configured, the Web UI will access the system as a Guest. Therefore, even if only an API Key is configured, all APIs can still be accessed through the Guest account, which remains insecure. Hence, to safeguard the API, it is necessary to configure both authentication methods simultaneously.
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## For Azure OpenAI Backend
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Azure OpenAI API can be created using the following commands in Azure CLI (you need to install Azure CLI first from [https://docs.microsoft.com/en-us/cli/azure/install-azure-cli](https://docs.microsoft.com/en-us/cli/azure/install-azure-cli)):
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```bash
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# Change the resource group name, location, and OpenAI resource name as needed
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RESOURCE_GROUP_NAME=LightRAG
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LOCATION=swedencentral
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RESOURCE_NAME=LightRAG-OpenAI
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az login
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az group create --name $RESOURCE_GROUP_NAME --location $LOCATION
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az cognitiveservices account create --name $RESOURCE_NAME --resource-group $RESOURCE_GROUP_NAME --kind OpenAI --sku S0 --location swedencentral
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az cognitiveservices account deployment create --resource-group $RESOURCE_GROUP_NAME --model-format OpenAI --name $RESOURCE_NAME --deployment-name gpt-4o --model-name gpt-4o --model-version "2024-08-06" --sku-capacity 100 --sku-name "Standard"
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az cognitiveservices account deployment create --resource-group $RESOURCE_GROUP_NAME --model-format OpenAI --name $RESOURCE_NAME --deployment-name text-embedding-3-large --model-name text-embedding-3-large --model-version "1" --sku-capacity 80 --sku-name "Standard"
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az cognitiveservices account show --name $RESOURCE_NAME --resource-group $RESOURCE_GROUP_NAME --query "properties.endpoint"
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az cognitiveservices account keys list --name $RESOURCE_NAME -g $RESOURCE_GROUP_NAME
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```
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The output of the last command will give you the endpoint and the key for the OpenAI API. You can use these values to set the environment variables in the `.env` file.
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```
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# Azure OpenAI Configuration in .env:
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LLM_BINDING=azure_openai
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LLM_BINDING_HOST=your-azure-endpoint
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LLM_MODEL=your-model-deployment-name
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LLM_BINDING_API_KEY=your-azure-api-key
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### API version is optional, defaults to latest version
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AZURE_OPENAI_API_VERSION=2024-08-01-preview
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### If using Azure OpenAI for embeddings
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EMBEDDING_BINDING=azure_openai
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EMBEDDING_MODEL=your-embedding-deployment-name
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```
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## LightRAG Server Configuration in Detail
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The API Server can be configured in three ways (highest priority first):
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* Command line arguments
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* Environment variables or .env file
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* Config.ini (Only for storage configuration)
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Most of the configurations come with default settings; check out the details in the sample file: `.env.example`. Data storage configuration can also be set by config.ini. A sample file `config.ini.example` is provided for your convenience.
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### LLM and Embedding Backend Supported
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LightRAG supports binding to various LLM/Embedding backends:
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* ollama
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* lollms
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* openai & openai compatible
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* azure_openai
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Use environment variables `LLM_BINDING` or CLI argument `--llm-binding` to select the LLM backend type. Use environment variables `EMBEDDING_BINDING` or CLI argument `--embedding-binding` to select the Embedding backend type.
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### Entity Extraction Configuration
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* ENABLE_LLM_CACHE_FOR_EXTRACT: Enable LLM cache for entity extraction (default: true)
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It's very common to set `ENABLE_LLM_CACHE_FOR_EXTRACT` to true for a test environment to reduce the cost of LLM calls.
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### Storage Types Supported
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LightRAG uses 4 types of storage for different purposes:
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* KV_STORAGE: llm response cache, text chunks, document information
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* VECTOR_STORAGE: entities vectors, relation vectors, chunks vectors
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* GRAPH_STORAGE: entity relation graph
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* DOC_STATUS_STORAGE: document indexing status
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Each storage type has several implementations:
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* KV_STORAGE supported implementations:
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```
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JsonKVStorage JsonFile (default)
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PGKVStorage Postgres
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RedisKVStorage Redis
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MongoKVStorage MongoDB
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```
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* GRAPH_STORAGE supported implementations:
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```
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NetworkXStorage NetworkX (default)
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Neo4JStorage Neo4J
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PGGraphStorage Postgres
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AGEStorage AGE
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```
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* VECTOR_STORAGE supported implementations:
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```
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NanoVectorDBStorage NanoVector (default)
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PGVectorStorage Postgres
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MilvusVectorDBStorage Milvus
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ChromaVectorDBStorage Chroma
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FaissVectorDBStorage Faiss
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QdrantVectorDBStorage Qdrant
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MongoVectorDBStorage MongoDB
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```
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* DOC_STATUS_STORAGE: supported implementations:
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```
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JsonDocStatusStorage JsonFile (default)
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PGDocStatusStorage Postgres
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MongoDocStatusStorage MongoDB
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```
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### How to Select Storage Implementation
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You can select storage implementation by environment variables. You can set the following environment variables to a specific storage implementation name before the first start of the API Server:
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```
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LIGHTRAG_KV_STORAGE=PGKVStorage
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LIGHTRAG_VECTOR_STORAGE=PGVectorStorage
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LIGHTRAG_GRAPH_STORAGE=PGGraphStorage
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LIGHTRAG_DOC_STATUS_STORAGE=PGDocStatusStorage
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```
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You cannot change storage implementation selection after adding documents to LightRAG. Data migration from one storage implementation to another is not supported yet. For further information, please read the sample env file or config.ini file.
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### LightRAG API Server Command Line Options
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| Parameter | Default | Description |
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| --------------------- | ------------- | ------------------------------------------------------------------------------------------------------------------------------- |
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| --host | 0.0.0.0 | Server host |
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| --port | 9621 | Server port |
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| --working-dir | ./rag_storage | Working directory for RAG storage |
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| --input-dir | ./inputs | Directory containing input documents |
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| --max-async | 4 | Maximum number of async operations |
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| --max-tokens | 32768 | Maximum token size |
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| --timeout | 150 | Timeout in seconds. None for infinite timeout (not recommended) |
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| --log-level | INFO | Logging level (DEBUG, INFO, WARNING, ERROR, CRITICAL) |
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| --verbose | - | Verbose debug output (True, False) |
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| --key | None | API key for authentication. Protects the LightRAG server against unauthorized access |
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| --ssl | False | Enable HTTPS |
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| --ssl-certfile | None | Path to SSL certificate file (required if --ssl is enabled) |
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| --ssl-keyfile | None | Path to SSL private key file (required if --ssl is enabled) |
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| --top-k | 50 | Number of top-k items to retrieve; corresponds to entities in "local" mode and relationships in "global" mode. |
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| --cosine-threshold | 0.4 | The cosine threshold for nodes and relation retrieval, works with top-k to control the retrieval of nodes and relations. |
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| --llm-binding | ollama | LLM binding type (lollms, ollama, openai, openai-ollama, azure_openai) |
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| --embedding-binding | ollama | Embedding binding type (lollms, ollama, openai, azure_openai) |
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| --auto-scan-at-startup| - | Scan input directory for new files and start indexing |
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### .env Examples
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```bash
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### Server Configuration
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# HOST=0.0.0.0
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PORT=9621
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WORKERS=2
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### Settings for document indexing
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ENABLE_LLM_CACHE_FOR_EXTRACT=true
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SUMMARY_LANGUAGE=Chinese
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MAX_PARALLEL_INSERT=2
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### LLM Configuration (Use valid host. For local services installed with docker, you can use host.docker.internal)
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TIMEOUT=200
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TEMPERATURE=0.0
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MAX_ASYNC=4
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MAX_TOKENS=32768
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LLM_BINDING=openai
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LLM_MODEL=gpt-4o-mini
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LLM_BINDING_HOST=https://api.openai.com/v1
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LLM_BINDING_API_KEY=your-api-key
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### Embedding Configuration (Use valid host. For local services installed with docker, you can use host.docker.internal)
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EMBEDDING_MODEL=bge-m3:latest
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EMBEDDING_DIM=1024
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EMBEDDING_BINDING=ollama
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EMBEDDING_BINDING_HOST=http://localhost:11434
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### For JWT Auth
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# AUTH_ACCOUNTS='admin:admin123,user1:pass456'
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# TOKEN_SECRET=your-key-for-LightRAG-API-Server-xxx
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# TOKEN_EXPIRE_HOURS=48
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# LIGHTRAG_API_KEY=your-secure-api-key-here-123
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# WHITELIST_PATHS=/api/*
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# WHITELIST_PATHS=/health,/api/*
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```
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## API Endpoints
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All servers (LoLLMs, Ollama, OpenAI and Azure OpenAI) provide the same REST API endpoints for RAG functionality. When the API Server is running, visit:
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- Swagger UI: http://localhost:9621/docs
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- ReDoc: http://localhost:9621/redoc
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You can test the API endpoints using the provided curl commands or through the Swagger UI interface. Make sure to:
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1. Start the appropriate backend service (LoLLMs, Ollama, or OpenAI)
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2. Start the RAG server
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3. Upload some documents using the document management endpoints
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4. Query the system using the query endpoints
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5. Trigger document scan if new files are put into the inputs directory
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### Query Endpoints:
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#### POST /query
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Query the RAG system with options for different search modes.
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```bash
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curl -X POST "http://localhost:9621/query" \
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-H "Content-Type: application/json" \
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-d '{"query": "Your question here", "mode": "hybrid"}'
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```
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#### POST /query/stream
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Stream responses from the RAG system.
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```bash
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curl -X POST "http://localhost:9621/query/stream" \
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-H "Content-Type: application/json" \
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-d '{"query": "Your question here", "mode": "hybrid"}'
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```
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### Document Management Endpoints:
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#### POST /documents/text
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Insert text directly into the RAG system.
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```bash
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curl -X POST "http://localhost:9621/documents/text" \
|
|
-H "Content-Type: application/json" \
|
|
-d '{"text": "Your text content here", "description": "Optional description"}'
|
|
```
|
|
|
|
#### POST /documents/file
|
|
Upload a single file to the RAG system.
|
|
|
|
```bash
|
|
curl -X POST "http://localhost:9621/documents/file" \
|
|
-F "file=@/path/to/your/document.txt" \
|
|
-F "description=Optional description"
|
|
```
|
|
|
|
#### POST /documents/batch
|
|
Upload multiple files at once.
|
|
|
|
```bash
|
|
curl -X POST "http://localhost:9621/documents/batch" \
|
|
-F "files=@/path/to/doc1.txt" \
|
|
-F "files=@/path/to/doc2.txt"
|
|
```
|
|
|
|
#### POST /documents/scan
|
|
|
|
Trigger document scan for new files in the input directory.
|
|
|
|
```bash
|
|
curl -X POST "http://localhost:9621/documents/scan" --max-time 1800
|
|
```
|
|
|
|
> Adjust max-time according to the estimated indexing time for all new files.
|
|
|
|
#### DELETE /documents
|
|
|
|
Clear all documents from the RAG system.
|
|
|
|
```bash
|
|
curl -X DELETE "http://localhost:9621/documents"
|
|
```
|
|
|
|
### Ollama Emulation Endpoints:
|
|
|
|
#### GET /api/version
|
|
|
|
Get Ollama version information.
|
|
|
|
```bash
|
|
curl http://localhost:9621/api/version
|
|
```
|
|
|
|
#### GET /api/tags
|
|
|
|
Get available Ollama models.
|
|
|
|
```bash
|
|
curl http://localhost:9621/api/tags
|
|
```
|
|
|
|
#### POST /api/chat
|
|
|
|
Handle chat completion requests. Routes user queries through LightRAG by selecting query mode based on query prefix. Detects and forwards OpenWebUI session-related requests (for metadata generation task) directly to the underlying LLM.
|
|
|
|
```shell
|
|
curl -N -X POST http://localhost:9621/api/chat -H "Content-Type: application/json" -d \
|
|
'{"model":"lightrag:latest","messages":[{"role":"user","content":"猪八戒是谁"}],"stream":true}'
|
|
```
|
|
|
|
> For more information about Ollama API, please visit: [Ollama API documentation](https://github.com/ollama/ollama/blob/main/docs/api.md)
|
|
|
|
#### POST /api/generate
|
|
|
|
Handle generate completion requests. For compatibility purposes, the request is not processed by LightRAG, and will be handled by the underlying LLM model.
|
|
|
|
### Utility Endpoints:
|
|
|
|
#### GET /health
|
|
Check server health and configuration.
|
|
|
|
```bash
|
|
curl "http://localhost:9621/health"
|
|
```
|