# Configuration using CRDs - special options for Large Scale Deployments

{% hint style="warning" %}
The advanced configuration options explained on this page require an existing helm-based deployment on K8s with CRD version v1beta2. See here for instructions: [Install Using Helm - new flow (beta)](/getting-started/start-with-kubernetes/install-using-helm-new-flow-beta.md)
{% endhint %}

Specifically for usage in larger scale deployments on Kubernetes, open-appsec offers some advanced functionalities for declarative configurations:

### appsecClassName property for custom resources

appsecClassName support allows having multiple, distinct sets of custom resources for the configuration of different, parallel open-appsec deployments on the same Kubernetes cluster.\
It is possible to link each custom resource using the optional *appsecClassName* property with one of your open-appsec deployments set to use that same appsec class, find the configuration details here:

{% content-ref url="/pages/KiT1rbtMgbkqqty3junG" %}
[Using appsec class for assigning separate custom resources to specific deployments](/getting-started/start-with-kubernetes/configuration-using-crds-special-options-for-large-scale-deployments/using-appsec-class-for-assigning-separate-custom-resources-to-specific-deployments.md)
{% endcontent-ref %}

### namespace-scoped CRDs

It is possible to create and manage the custom resources for open-appsec configuration in a specific namespace by using the new namespace-scoped CRDs instead of using cluster-scoped CRDs, find the configuration details here:

{% content-ref url="/pages/GWifgIM7vLXdG26hgm0F" %}
[Using namespace-scoped custom resources](/getting-started/start-with-kubernetes/configuration-using-crds-special-options-for-large-scale-deployments/using-namespace-scoped-custom-resources.md)
{% endcontent-ref %}


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