# Amazon EKS Provisioned Control Plane

This diagram illustrates the architecture of Amazon EKS Provisioned Control Plane, highlighting its components and interactions:

{% @mermaid/diagram content="graph TD
A\[Amazon EKS Cluster] --> B\[Control Plane Nodes]
B --> C\[API Server]
B --> D\[Scheduler]
B --> E\[etcd Database]
C --> F\[Client Requests]
D --> G\[Pod Scheduling]
E --> H\[Cluster State]
A --> I\[Control Plane Scaling Tier]
I --> J\[XL, 2XL, 4XL]
J --> K\[API Request Concurrency]
J --> L\[Pod Scheduling Rate]
J --> M\[Cluster Database Size]
K --> N\[Concurrent Requests Processed]
L --> O\[Pods Scheduled per Second]
M --> P\[Storage Space Allocated GB]
N --> Q\[Performance Metrics]
O --> Q
P --> Q
Q --> R\[CloudWatch Metrics]
R --> S\[Prometheus Endpoint]
S --> T\[Monitoring and Alerts]" %}

## Overview

Amazon EKS Provisioned Control Plane allows cluster administrators to pre-allocate control plane capacity, ensuring high and predictable performance. It operates alongside the default Standard mode, which dynamically scales based on workload demands.

## Key Features

* **Scaling Tiers**:
  * Available in XL, 2XL, and 4XL sizes.
  * Defined by API request concurrency, pod scheduling rate, and cluster database size.
* **Use Cases**:
  * Performance-critical workloads requiring minimal latency.
  * Massively scalable workloads like AI training and high-performance computing.
  * Anticipated high-demand events.
  * Environment consistency across staging, production, and disaster recovery.

## Control Plane Modes

* **Standard Mode**:
  * Automatically scales based on workload.
  * Recommended for most applications due to cost efficiency.
* **Provisioned Mode**:
  * Pre-allocated capacity for consistent performance.
  * Suitable for workloads intolerant of scaling variability.

## Monitoring and Management

* **Utilization Metrics**:
  * Available via Amazon CloudWatch and Prometheus.
  * Key metrics include API request concurrency, pod scheduling rate, and database size.
* **Tier Management**:
  * Requires explicit opt-in.
  * No automatic scaling between tiers; manual adjustments can be made.

## Considerations

* **Cost**:
  * Additional hourly charges for Provisioned mode.
  * Pricing varies by tier and region.
* **Database Limitations**:
  * Standard mode supports up to 8 GB of etcd storage.
  * Transition back to Standard mode requires reducing database size below this threshold.
* **Performance Optimization**:
  * Adherence to Kubernetes best practices is essential for achieving expected performance levels.

This architecture and summary provide a comprehensive understanding of Amazon EKS Provisioned Control Plane, its benefits, and considerations for implementation.