# Azure Container Registry

Configure Valohai to pull private images from Azure Container Registry (ACR).

> Private registries are restricted to organization projects. Personal projects don't have access to private repositories.

## Create a service principal

Follow Microsoft's guide: [Create and use service principal credentials](https://docs.microsoft.com/en-us/azure/container-registry/container-registry-auth-service-principal)

### Quick steps

1. Create a service principal with read access to your ACR:

```shell
az ad sp create-for-rbac \
  --name valohai-acr-reader \
  --role acrpull \
  --scopes /subscriptions/<subscription-id>/resourceGroups/<resource-group>/providers/Microsoft.ContainerRegistry/registries/<registry-name>
```

2. Save the output:
   * `appId` (your username)
   * `password` (your password)

## Add credentials to Valohai

1. Navigate to `Hi, <n>` (top-right menu) → `Manage <organization>`
2. Go to **Registries** under organization controls
3. Click **Add a new entry**
4. Configure:
   * **Match pattern**: `<registry-name>.azurecr.io/*`
     * Example: `mycompany.azurecr.io/*`
     * Or narrow it: `mycompany.azurecr.io/ml-images/*`
   * **Registry type**: Docker (username and password authentication)
   * **Username**: Service principal's `appId`
   * **Password**: Service principal's `password`
5. Save

## Use the private image

Reference your ACR image in `valohai.yaml`:

```yaml
- step:
    name: train
    image: mycompany.azurecr.io/ml-training:v1.0
    command:
      - python train.py
```

Valohai handles authentication automatically.


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