# Configuration Guide

## Configuration File

The NOMYO Router is configured via a YAML file (default: `config.yaml`). This file defines the Ollama endpoints, connection limits, and API keys.

### Basic Configuration

```yaml
# config.yaml
endpoints:
  - http://localhost:11434
  - http://ollama-server:11434

# Maximum concurrent connections *per endpoint‑model pair*
max_concurrent_connections: 2
```

### Complete Example

```yaml
# config.yaml
endpoints:
  - http://192.168.0.50:11434
  - http://192.168.0.51:11434
  - http://192.168.0.52:11434
  - https://api.openai.com/v1

# Maximum concurrent connections *per endpoint‑model pair* (equals to OLLAMA_NUM_PARALLEL)
max_concurrent_connections: 2

# API keys for remote endpoints
# Set an environment variable like OPENAI_KEY
# Confirm endpoints are exactly as in endpoints block
api_keys:
  "http://192.168.0.50:11434": "ollama"
  "http://192.168.0.51:11434": "ollama"
  "http://192.168.0.52:11434": "ollama"
  "https://api.openai.com/v1": "${OPENAI_KEY}"
```

## Configuration Options

### `endpoints`

**Type**: `list[str]`

**Description**: List of Ollama endpoint URLs. Can include both Ollama endpoints (`http://host:11434`) and OpenAI-compatible endpoints (`https://api.openai.com/v1`).

**Examples**:
```yaml
endpoints:
  - http://localhost:11434
  - http://ollama1:11434
  - http://ollama2:11434
  - https://api.openai.com/v1
  - https://api.anthropic.com/v1
```

**Notes**:
- Ollama endpoints use the standard `/api/` prefix
- OpenAI-compatible endpoints use `/v1` prefix
- The router automatically detects endpoint type based on URL pattern

### `max_concurrent_connections`

**Type**: `int`

**Default**: `1`

**Description**: Maximum number of concurrent connections allowed per endpoint-model pair. This corresponds to Ollama's `OLLAMA_NUM_PARALLEL` setting.

**Example**:
```yaml
max_concurrent_connections: 4
```

**Notes**:
- This setting controls how many requests can be processed simultaneously for a specific model on a specific endpoint
- When this limit is reached, the router will route requests to other endpoints with available capacity
- Higher values allow more parallel requests but may increase memory usage

### `api_keys`

**Type**: `dict[str, str]`

**Description**: Mapping of endpoint URLs to API keys. Used for authenticating with remote endpoints.

**Example**:
```yaml
api_keys:
  "http://192.168.0.50:11434": "ollama"
  "https://api.openai.com/v1": "${OPENAI_KEY}"
```

**Environment Variables**:
- API keys can reference environment variables using `${VAR_NAME}` syntax
- The router will expand these references at startup
- Example: `${OPENAI_KEY}` will be replaced with the value of the `OPENAI_KEY` environment variable

## Environment Variables

### `NOMYO_ROUTER_CONFIG_PATH`

**Description**: Path to the configuration file. If not set, defaults to `config.yaml` in the current working directory.

**Example**:
```bash
export NOMYO_ROUTER_CONFIG_PATH=/etc/nomyo-router/config.yaml
```

### `NOMYO_ROUTER_DB_PATH`

**Description**: Path to the SQLite database file for storing token counts. If not set, defaults to `token_counts.db` in the current working directory.

**Example**:
```bash
export NOMYO_ROUTER_DB_PATH=/var/lib/nomyo-router/token_counts.db
```

### API-Specific Keys

You can set API keys directly as environment variables:

```bash
export OPENAI_KEY=your_openai_api_key
export ANTHROPIC_KEY=your_anthropic_api_key
```

## Configuration Best Practices

### Multiple Ollama Instances

For a cluster of Ollama instances:

```yaml
endpoints:
  - http://ollama-worker1:11434
  - http://ollama-worker2:11434
  - http://ollama-worker3:11434

max_concurrent_connections: 2
```

**Recommendation**: Set `max_concurrent_connections` to match your Ollama instances' `OLLAMA_NUM_PARALLEL` setting.

### Mixed Endpoints

Combining Ollama and OpenAI endpoints:

```yaml
endpoints:
  - http://localhost:11434
  - https://api.openai.com/v1

api_keys:
  "https://api.openai.com/v1": "${OPENAI_KEY}"
```

**Note**: The router will automatically route requests based on model availability across all endpoints.

### High Availability

For production deployments:

```yaml
endpoints:
  - http://ollama-primary:11434
  - http://ollama-secondary:11434
  - http://ollama-tertiary:11434

max_concurrent_connections: 3
```

**Recommendation**: Use multiple endpoints for redundancy and load distribution.

## Configuration Validation

The router validates the configuration at startup:

1. **Endpoint URLs**: Must be valid URLs
2. **API Keys**: Must be strings (can reference environment variables)
3. **Connection Limits**: Must be positive integers

If the configuration is invalid, the router will exit with an error message.

## Dynamic Configuration

The configuration is loaded at startup and cannot be changed without restarting the router. For production deployments, consider:

1. Using a configuration management system
2. Implementing a rolling restart strategy
3. Using environment variables for sensitive data

## Example Configurations

See the [examples](examples/) directory for ready-to-use configuration examples.