Managed Role-Based Access for LLM Deployments on AWS

Question

Pulumi · Accepted Answer

To manage role-based access control (RBAC) for Language Model (LLM) deployments on AWS, we'll create an example using Kubernetes RBAC resources managed by Pulumi. Since LLM deployments might need orchestrated container management, utilizing Kubernetes makes sense; thus, Kubernetes' RBAC mechanisms can help control the access of resources within the cluster.

We'll define a simple RBAC setup in a Kubernetes cluster that will involve the following components:

1. **ServiceAccount**: This is the account that your application's pod will use to interact with Kubernetes.
2. **Role**: This defines what actions are allowed within a particular namespace. For LLM, you might need permissions like `get`, `list`, and `watch` for resources like ConfigMaps, Secrets, Pods, etc.
3. **RoleBinding**: This binds the `Role`'s permissions to specific accounts, typically `ServiceAccount`s within the same namespace.

In AWS, you might be using Amazon EKS to run your Kubernetes cluster. If so, you need to ensure that your Pulumi stack is properly configured to interact with your AWS account and EKS.

Here's a Pulumi program that sets up basic RBAC for a Kubernetes deployment, suitable for a hypothetical LLM deployment:

```python
import pulumi
import pulumi_kubernetes as k8s

# Create a Kubernetes ServiceAccount that the application pod will use.
app_service_account = k8s.core.v1.ServiceAccount(
    "app-service-account",
    metadata=k8s.meta.v1.ObjectMetaArgs(
        name="llm-service-account",
        namespace="default" # Change this to the appropriate namespace for the LLM app.
    )
)

# Define a Role that specifies the access controls for the Language Model deployment.
llm_role = k8s.rbac.v1.Role(
    "llm-role",
    metadata=k8s.meta.v1.ObjectMetaArgs(
        name="llm-role",
        namespace="default" # This should be the same namespace as the ServiceAccount.
    ),
    rules=[k8s.rbac.v1.PolicyRuleArgs(
        api_groups=[""], # "" indicates the core API group.
        resources=["pods", "configmaps", "secrets"], # Add or remove resources as needed.
        verbs=["get", "list", "watch"] # Specify the actions that are allowed.
    )]
)

# Create a RoleBinding to grant the Role's permissions to the ServiceAccount.
llm_role_binding = k8s.rbac.v1.RoleBinding(
    "llm-role-binding",
    metadata=k8s.meta.v1.ObjectMetaArgs(
        name="llm-role-binding",
        namespace="default" # Ensure this matches the Role and ServiceAccount namespace.
    ),
    role_ref=k8s.rbac.v1.RoleRefArgs(
        api_group="rbac.authorization.k8s.io",
        kind="Role",
        name=llm_role.metadata.name
    ),
    subjects=[k8s.rbac.v1.SubjectArgs(
        kind="ServiceAccount",
        name=app_service_account.metadata.name,
        namespace="default"
    )]
)

# Export the ServiceAccount name for use in deployment descriptors.
pulumi.export("service_account_name", app_service_account.metadata.name)
```

In this program:
- We initialize a `ServiceAccount` for the application to interact with Kubernetes.
- We define a `Role` with the necessary permissions for managing pods and related resources.
- We create a `RoleBinding` to associate the `Role` with the `ServiceAccount`.

*Please note*: The service account, role, and rolebinding are all set to the "default" namespace. In a real-world scenario, you should use a dedicated namespace for your LLM deployments.

To apply this program:
1. Ensure you have Pulumi CLI installed and configured with your AWS credentials and the Kubernetes context set to your Amazon EKS cluster.
2. Save the above code to a file, for example `rbac.py`.
3. Run `pulumi up` in the directory containing the `rbac.py` to deploy these resources to your cluster.

This program will set the foundation for managing access control for LLM deployments within Kubernetes on AWS. As your deployment requirements grow, you may need to create more sophisticated RBAC rules tailored to the specific actions your LLM application needs to perform.