Understanding Kubernetes: Part 1 -Control Plane
If you’ve been following our Kubernetes series 2025, welcome back! For new readers, check out Part 1: Part-1 link.
What is the Kubernetes Control Plane?
The Kubernetes Control Plane is the core component of Kubernetes, which is responsible for managing the cluster’s overall state and ensuring the desired state of resources is maintained. It orchestrates all operations in the cluster, from scheduling workloads to scaling applications and managing networking.
For example, when you deploy a pod using kubectl, the control plane ensures that the pod is scheduled on a suitable node, maintains its lifecycle, and handles recovery in case of failures.
Key Components of the Control Plane:
API Server: Serves as the entry point for all cluster operations, handling RESTful API requests.
etcd: A distributed key-value store that acts as the single source of truth for the cluster’s state and configuration.
Controller Manager: Manages control loops that monitor the desired state of resources (e.g., Deployments, ReplicaSets) and make adjustments to achieve that state.
Scheduler: Assigns pods to appropriate nodes based on resource requirements and constraints.
Cloud Controller Manager: Integrates with cloud providers to manage resources like load balancers, volumes, and networking.
Example:
In a scenario where a node fails, the control plane components work together to maintain availability:
The Controller Manager detects the failure and reschedules pods from the failed node to other healthy nodes.
The Scheduler assigns the pods to appropriate nodes based on resource availability.
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Stay Tuned. In our next article, we’ll explore Kubernetes’ Fundamentals more thoroughly to help you build a solid foundation.
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