---
title: dependsOn
url: /docs/iac/concepts/resources/options/dependson/
---
The `dependsOn` resource option creates a list of explicit dependencies between resources.

> **Applies to custom and component resources.** The `dependsOn` resource option applies to both [custom resources](/docs/iac/concepts/resources/) and [component resources](/docs/iac/concepts/components/). It is defined on the base resource-options type in every Pulumi SDK.

Pulumi automatically tracks dependencies between resources when you supply an input argument that came from another resource’s output properties. In some cases, however, you may need to explicitly specify additional dependencies that Pulumi doesn’t know about but must still respect. This might happen if a dependency is external to the infrastructure itself—such as an application dependency—or is implied due to an ordering or eventual consistency requirement. The `dependsOn` option ensures that resource creation, update, and deletion operations are executed in the correct order.

This example demonstrates how to make `res2` dependent on `res1`, even if there is no property-level dependency:

<!-- chooser: language -->

<!-- option: typescript -->
```typescript
let res1 = new MyResource("res1", {/*...*/});
let res2 = new MyResource("res2", {/*...*/}, { dependsOn: [res1] });

```

<!-- /option -->

<!-- option: python -->
```python
res1 = MyResource("res1")
res2 = MyResource("res2", opts=ResourceOptions(depends_on=[res1]))

```

<!-- /option -->

<!-- option: go -->
```go
res1, _ := NewMyResource(ctx, "res1", &MyResourceArgs{/*...*/})
res2, _ := NewMyResource(ctx, "res2", &MyResourceArgs{/*...*/}, pulumi.DependsOn([]pulumi.Resource{res1}))

```

<!-- /option -->

<!-- option: csharp -->
```csharp
var res1 = new MyResource("res1", new MyResourceArgs());
var res2 = new MyResource("res2", new MyResourceArgs(),
    new CustomResourceOptions { DependsOn = { res1 } });

```

<!-- /option -->

<!-- option: java -->
```java
var res1 = new MyResource("res1", new MyResourceArgs());
var res2 = new MyResource("res2",
    new MyResourceArgs(),
    CustomResourceOptions.builder()
        .dependsOn(res1)
        .build());

```

<!-- /option -->

<!-- option: yaml -->
```yaml
resources:
  res1:
    type: MyResource
  res2:
    type: MyResource
    options:
      dependsOn:
        - ${res1}

```

<!-- /option -->

<!-- /chooser -->