Kubernetes: update information doc

Containerization & Orchestration/kubernetes/1-Information.md

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+# Kubernetes (K8s) Documentation
+
+## Overview  
+**Kubernetes (K8s)** is an open-source container orchestration platform designed to automate the deployment, scaling, and operation of containerized applications.
+
+---
+
+## Control Plane (CP)  
+The **Control Plane** is the core management component of a Kubernetes cluster. It makes global decisions about the cluster (e.g., scheduling), and it maintains the desired state of the cluster by managing workloads and directing communication within the system.  
+> **Note:** By default, the Control Plane does not directly manage or run application containers.
+
+### Key Components of the Control Plane:
+- **API Server (`kube-apiserver`)**:  
+  Exposes the Kubernetes API and serves as the entry point to the cluster. It handles communication between internal components and external clients.
+  
+- **Scheduler (`kube-scheduler`)**:  
+  Assigns work (e.g., pods) to nodes based on resource availability and policies.
+
+- **Controller Manager (`kube-controller-manager`)**:  
+  Runs controllers that regulate the state of the cluster (e.g., Node Controller, Replication Controller, etc.).
+
+- **etcd**:  
+  A consistent, highly-available key-value store that stores all cluster data, configurations, and states. This is the "database" of Kubernetes.
+
+---
+
+## Worker Nodes  
+Worker nodes are the machines where containerized applications run. Each worker node contains essential components for managing containers.
+
+### Key Components of a Worker Node:
+- **Kubelet**:  
+  An agent that ensures containers are running as specified in their Pod definitions. It communicates with the Control Plane to receive and execute tasks.
+
+- **Kube Proxy**:  
+  Maintains network rules and handles routing for communication between services within the cluster and with external traffic.
+
+---
+
+## Data Flow  
+- **Kubelet** and **Kube Proxy** on each worker node communicate with the **API Server** in the Control Plane for task execution and resource updates.
+- The **Scheduler** assigns pods to nodes based on resource requirements, while the **Controller Manager** ensures that the cluster state remains consistent.
+
+---
+
+## Administration Tools  
+- **`kubeadm`**:  
+  A tool for bootstrapping Kubernetes clusters. It simplifies the setup and configuration of the Control Plane and worker nodes.
+
+- **`kubectl`**:  
+  The command-line interface (CLI) for interacting with the Kubernetes API. It is used to manage resources, deploy applications, and inspect cluster components.
+
+---
+
+## Kubernetes Version Compatibility  
+### Kubernetes and Container Runtimes:
+- **Kubernetes ≤ 1.23**:  
+  Compatible with Docker as the default container runtime.
+  
+- **Kubernetes 1.24 to 1.25**:  
+  Docker is not supported as a runtime. These versions require `containerd` or another Container Runtime Interface (CRI) implementation.
+  
+- **Kubernetes ≥ 1.25**:  
+  Docker can be installed on the server but must be used indirectly through `containerd` or another CRI-compliant runtime. Docker itself is not a supported runtime.
+
+

Containerization & Orchestration/kubernetes/information.md

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-# Kubernetes (Kuber) Documentation
-
-## Control Plane (CP)
-- **CP (Control Plane)**: The central management entity of the Kubernetes cluster.
-- By default, the manager in Kubernetes does not directly handle any containers.
-
-## Kubernetes Manager Components
-- **Control Manager**
-- **Scheduler**
-- **API Server**
-- **etcd (Database)**
-- **Kubelet**
-
-## Kubernetes Worker Components
-- **Kube Proxy**
-- **Kubelet**
-
-## Data Flow
-- **Kube Proxy** and **Kubelet** communicate with the Kubernetes Manager for data handling.
-
-## Administration Tools
-- **kubeadm**: Used for administration commands.
-- **kubectl**: Used to manage nodes and services.
-
----