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..

SGLang Monitoring Setup

This directory contains a ready-to-use monitoring setup for SGLang using Prometheus and Grafana.

Prerequisites

  • Docker and Docker Compose installed
  • SGLang server running with metrics enabled

Usage

  1. Start your SGLang server with metrics enabled:
python -m sglang.launch_server --model-path meta-llama/Meta-Llama-3.1-8B-Instruct --port 30000 --enable-metrics

By default, the metrics server will run on 127.0.0.1:30000.

  1. Start the monitoring stack:
cd examples/monitoring
docker compose up
  1. Access the monitoring interfaces:

Default Grafana login credentials:

  • Username: admin
  • Password: admin

You'll be prompted to change the password on first login.

  1. The SGLang dashboard will be automatically available in the "SGLang Monitoring" folder.

Troubleshooting

Port Conflicts

If you see errors like "port is already allocated":

  1. Check if you already have Prometheus or Grafana running:

    docker ps | grep -E 'prometheus|grafana'
    
  2. Stop any conflicting containers:

    docker stop <container_id>
    
  3. Ensure no other services are using ports 9090 and 3000:

    lsof -i :9090
    lsof -i :3000
    

Connection Issues

If Grafana cannot connect to Prometheus:

  1. Check that both services are running
  2. Verify the datasource configuration in Grafana
  3. Check that your SGLang server is properly exposing metrics

Configuration

  • Prometheus configuration: prometheus.yaml
  • Docker Compose configuration: docker-compose.yaml
  • Grafana datasource: grafana/datasources/datasource.yaml
  • Grafana dashboard configuration: grafana/dashboards/config/dashboard.yaml
  • SGLang dashboard JSON: grafana/dashboards/json/sglang-dashboard.json

Customization

You can customize the monitoring setup by modifying the configuration files as needed.