# Hybrid Deployment

The hybrid deployment model for emCA integrates cloud infrastructure with on-premises Hardware Security Modules (HSMs) to balance operational efficiency with stringent cryptographic security.

<figure><img src="/files/dTbkhPMGJsVIyfurchlP" alt=""><figcaption></figcaption></figure>

**Key Components**

* **Cloud-Hosted emCA Services**\
  emCA application servers, OCSP responders, TSA, and database run in a cloud environment (for example, AWS, Azure, GCP).
* **On-Premises HSMs**\
  Private keys and sensitive cryptographic material reside in local HSMs deployed in the data center or secure colocation.
* **Secure Connectivity**\
  VPN or dedicated private link encrypts all API calls between cloud components and on-premises HSMs.
* **Cloud Network Control**
  * Load balancer distributes traffic across cloud instances.
  * Web application firewall (WAF) filters HTTP threats.
  * Threat monitoring service (for example, GuardDuty) detects suspicious activity.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://emca.emudhra.com/getting-started/deployment-models/hybrid-deployment.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.