# ServiceInstanceUpdate

> The ServiceInstanceUpdate object in the Guv API.

## Fields

| Field | Type | Description |
| --- | --- | --- |
| `overrides` | [ServiceConfig](/docs/api/objects/service-config/) |  |

\* always present

## Example

```json
{
  "overrides": {
    "source": {
      "kind": "git",
      "repo": "string",
      "root": "apps/web",
      "watch": [
        "apps/web/**",
        "packages/ui/**",
        "pnpm-lock.yaml"
      ],
      "image": "ghcr.io/acme/api:1.4.2",
      "registry_credentials_secret": "string"
    },
    "build": {
      "builder": "railpack",
      "dockerfile": "services/api/Dockerfile",
      "context": "string"
    },
    "start": "pnpm --filter web start",
    "pre_deploy": "pnpm --filter db migrate deploy",
    "port": 3000,
    "healthcheck": {
      "type": "http",
      "path": "/healthz",
      "port": 1,
      "timeout_seconds": 10,
      "interval_seconds": 10,
      "start_timeout_seconds": 300
    },
    "resources": {
      "cpu": 1,
      "memory_mb": 1024
    },
    "replicas": {
      "min": 1,
      "max": 1,
      "scale_on": {
        "cpu_percent": 10,
        "memory_percent": 10,
        "concurrency": 1
      }
    },
    "sleep_when_idle": false,
    "private": false,
    "cron": {
      "schedule": "0 2 * * *",
      "timezone": "Europe/London",
      "timeout_seconds": 1,
      "concurrency_policy": "forbid"
    },
    "restart_policy": {
      "mode": "on_failure",
      "max_retries": 10
    },
    "deploy": {
      "overlap_seconds": 20,
      "auto_rollback": false
    },
    "volumes": [
      {
        "volume": "string",
        "mount_path": "/data"
      }
    ]
  }
}
```

## Used by

- [Set this environment's overrides for a service](/docs/api/services/#set-this-environments-overrides-for-a-service)