# Containerizing the IGP App with Docker

## Steps Performed

### 1. Created a Multi‑Stage Dockerfile (`Dockerfile`)

Two stages:

| Stage | Image | Purpose |
|---|---|---|
| `build` | `mcr.microsoft.com/dotnet/sdk:10.0` | Restores dependencies, builds, and publishes the Blazor WASM app |
| `final` | `nginx:alpine` | Copies the published `wwwroot/` output and a custom `nginx.conf` that serves it |

### 2. Created a Custom nginx Config (`nginx.conf`)

- Listens on port **8887** (not the default 80) so it doesn't conflict with other containers.
- Adds Blazor‑required MIME types: `application/wasm` (`.wasm`), `application/octet-stream` (`.dll`, `.blat`, `.dat`, `.webcil`).
- Enables `gzip_static` so pre‑compressed `.gz` variants are served automatically.
- Implements SPA fallback: `try_files $uri $uri/ /index.html` for client‑side routing.

### 3. Built the Image

```
docker build -t igp-app:latest -f Dockerfile .
```

Result: `docker.io/library/igp-app:latest`

### 4. Ran the Container

```
docker run -d --name igp-app -p 8887:8887 igp-app:latest
```

The container is now serving at **http://localhost:8887**.

### 5. Verified

- `docker ps` shows the container `Up` and port mapping `0.0.0.0:8887->8887/tcp`.
- `curl http://localhost:8887/` returns HTTP `200`.

## Files

| File | Purpose |
|---|---|
| `Dockerfile` | Multi‑stage build: .NET SDK → publish → nginx |
| `nginx.conf` | nginx config with Blazor MIME types, gzip, SPA fallback, port 8887 |

## How to Stop

```
docker stop igp-app
docker rm igp-app
```

## How to Rebuild

```
docker build -t igp-app:latest -f Dockerfile .
docker rm -f igp-app
docker run -d --name igp-app -p 8887:8887 igp-app:latest
```