Surge

Self-hosted distributed load testing engine. Send HTTP load to any target, get P50/P90/P99 latency, RPS, status code distribution, and error rate back in real time.

Live: loadtest.kernelgallery.com

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Architecture

React → C# API → RabbitMQ → Go Worker → Target
              ↓                    ↓
           MongoDB ←───── persist results
              ↑
         poll (2s)

Service	Role
C# .NET 8 API	Validates input, enqueues task, returns test ID (HTTP 202)
Go Worker	Consumes task, fires concurrent HTTP requests via goroutines
RabbitMQ	Async queue — decouples API from worker
MongoDB	Persists test records and metrics
React + Vite	Configures tests, polls and displays results

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Self-hosting with Coolify

Deploy each service (api, worker, frontend) as a separate Coolify application from this repo. All services must share the same Docker network.

API

Setting	Value
Base Dir	/api
Dockerfile	Dockerfile
Port	8080

Environment variables:

ASPNETCORE_URLS=http://+:8080
RABBITMQ_HOST=<rabbitmq-hostname>
RABBITMQ_PORT=5672
RABBITMQ_USER=<user>
RABBITMQ_PASS=<pass>
MONGODB_URL=mongodb://<user>:<pass>@<host>:27017/

Worker

Setting	Value
Base Dir	/worker
Dockerfile	Dockerfile
Port	(none)

Environment variables:

RABBITMQ_HOST=<rabbitmq-hostname>
RABBITMQ_PORT=5672
RABBITMQ_USER=<user>
RABBITMQ_PASS=<pass>
MONGODB_URL=mongodb://<user>:<pass>@<host>:27017/

Frontend

Setting	Value
Base Dir	/frontend
Dockerfile	Dockerfile
Port	80

Set the API base URL in frontend/src/api.js before building:

export const API = 'https://your-api-domain.com'

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Local dev with Docker Compose

docker compose up --build

• API → http://localhost:8080
• Frontend → http://localhost:3000

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Limits

• Max 5 000 requests per test
• Max 200 concurrent goroutines
• Localhost and private IPs are blocked

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Stack

C# .NET 8 · Go 1.22 · RabbitMQ 3 · MongoDB 7 · React 18 · Vite · Tailwind CSS