# Cloud Deployment

The cloud deployment model for emCA leverages AWS infrastructure to provide a secure, scalable, and high-availability environment for certificate management operations.

<figure><img src="/files/yblasnQpNlimB89IbWwg" alt=""><figcaption></figcaption></figure>

**Key Components**

* **Application Layer**\
  Two or more EC2 instances in public subnets, behind an Application Load Balancer. AWS WAF filters HTTP(S) traffic and GuardDuty monitors for threats.
* **Database Layer**\
  Two MySQL 8.0 RDS instances in private subnets, configured as master and replica for high availability.
* **Key Storage**\
  AWS CloudHSM cluster holds CA private keys and sensitive cryptographic material.
* **Persistent Storage**\
  Amazon EBS volumes provide durable storage for application and database data.
* **Networking Controls**\
  VPC subnets and security groups isolate services, routing and VPN links secure hybrid connections.
* **Operational Notes**
  * Auto Scaling groups adjust EC2 capacity to demand.
  * RDS Multi-AZ deployment ensures failover capability.
  * All inter-service communication uses encrypted channels.


---

# 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/cloud-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.