Kubernetes A Complete Visual Guide

Listing 1: Install kubectl on Linux

# Download latest stable release
curl -LO "https://dl.k8s.io/release/$(curl -L -s \
  https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"

# Install binary
sudo install -o root -g root -m 0755 kubectl /usr/local/bin/kubectl

# Verify installation
kubectl version --client

# Install Minikube
curl -LO https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64
sudo install minikube-linux-amd64 /usr/local/bin/minikube

# Start cluster (uses Docker driver by default)
minikube start --driver=docker --cpus=2 --memory=4g

# Check cluster status
minikube status
kubectl get nodes

# Enable useful addons
minikube addons enable ingress
minikube addons enable metrics-server
minikube addons enable dashboard

# Open dashboard in browser
minikube dashboard

# --- On ALL nodes ---
sudo apt-get update && sudo apt-get install -y containerd
sudo systemctl enable containerd && sudo systemctl start containerd

curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.29/deb/Release.key | \
  sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg
echo 'deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] \
  https://pkgs.k8s.io/core:/stable:/v1.29/deb/ /' | \
  sudo tee /etc/apt/sources.list.d/kubernetes.list

sudo apt-get update
sudo apt-get install -y kubelet kubeadm kubectl
sudo apt-mark hold kubelet kubeadm kubectl

# --- On CONTROL PLANE node ONLY ---
sudo kubeadm init --pod-network-cidr=10.244.0.0/16

mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

kubectl apply -f \
  https://raw.githubusercontent.com/flannel-io/flannel/master/Documentation/kube-flannel.yml

# --- On WORKER nodes ---
sudo kubeadm join <control-plane-ip>:6443 \
  --token <token> \
  --discovery-token-ca-cert-hash sha256:<hash>

apiVersion: v1
kind: Pod
metadata:
  name: my-app-pod
  namespace: default
  labels:
    app: my-app
spec:
  containers:
  - name: app
    image: nginx:1.25
    ports:
    - containerPort: 80
    resources:
      requests:
        memory: "64Mi"
        cpu: "250m"
      limits:
        memory: "128Mi"
        cpu: "500m"
    readinessProbe:
      httpGet:
        path: /healthz
        port: 80
      initialDelaySeconds: 5
      periodSeconds: 10