Introduction to Kubernetes

Kubernetes, often abbreviated as K8s, is a powerful open-source platform designed to automate deploying, scaling, and operating application containers. Here's a quick overview of its key concepts:

Nodes: Individual servers in the Kubernetes architecture.
Cluster: A group of nodes working together.
Pods: The smallest deployable units in Kubernetes, which run containers on nodes.

Master Components of Kubernetes

The Kubernetes master components manage the cluster and its workload:

API Server: Provides the CLI and RESTful API interface for interaction.
Scheduler: Assigns nodes to newly created pods.
ETCD: A key-value store that holds the entire cluster's state, including nodes and pods.
Control Manager: Ensures the desired state of the cluster is maintained.

Worker Node Components

Worker nodes run the applications and perform the following functions:

Kubelet: Ensures that containers are running in pods.
Kube Proxy: Manages network rules to enable communication with pods.
Container Runtime: Runs the containers.

Kubernetes Installation on Red Hat Linux

Step 1: Install Kubectl

1. Update the Repository:

command: "cat <<EOF | sudo tee /etc/yum.repos.d/kubernetes.repo

[kubernetes]

name=Kubernetes

baseurl=https://pkgs.k8s.io/core:/stable:/v1.30/rpm/

enabled=1

gpgcheck=1

gpgkey=https://pkgs.k8s.io/core:/stable:/v1.30/rpm/repodata/repomd.xml.key

EOF

2. Install Kubectl:

command: sudo yum install -y kubectl

3. Verify Installation:

command: kubectl version --client

Step 2: Install Minikube

Minikube is a tool that makes it easy to run Kubernetes locally, ideal for learning and development purposes.

1. Download Minikube:

command: curl -LO https://storage.googleapis.com/minikube/releases/latest/minikube-latest.aarch64.rpm

2. Install Minikube:

command: sudo rpm -Uvh minikube-latest.aarch64.rpm

3. Start Minikube:

command: minikube start

Handling Sudo User Permission Errors

If you encounter permission errors as a sudo user, follow these steps

- Switch User:

if you are logged in as a sudo user switch to any other use or create a new user I have user Danish already

command: su - username

- Add User to Docker Group:

command: sudo usermod -aG docker $USER && newgrp docker

after adding this user to the group now start the minikube again

- Edit the Sudoers File (if still getting error):

Use visudo to add your user, ensuring proper permissions
After resolving permissions, run: minikube start

Check Minikube Status:

To check the status of the running status of the minikube run the following command
command: minikube status

By following these steps, you can effectively set up and manage a Kubernetes environment on Red Hat Linux. This guide should help you get started with Kubernetes, providing a strong foundation for further exploration and learning.