Quick Start
To run this script directly, use the following command:
curl -fsSL https://raw.githubusercontent.com/alex938/docker-with-kubernetes-swarm/refs/heads/main/Kubernetes/install_k8s.sh | sh
You can also view the script here.
Introduction
This guide provides a script to set up a Kubernetes cluster on the controller node. It automates the process of disabling swap, installing Docker, configuring Kubernetes components, and initialising the cluster.
Step 1: Disable Swap
Kubernetes requires swap to be disabled. Use the following commands:
sudo swapoff -a
sudo sed -i '/\/swap.img/ s/^/#/' /etc/fstab
Step 2: Load Kernel Modules
Load the required kernel modules for Kubernetes:
cat <
overlay
br_netfilter
EOF
sudo modprobe overlay
sudo modprobe br_netfilter
Step 3: Configure sysctl
Enable required sysctl settings:
cat <
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.ipv4.ip_forward = 1
EOF
sudo sysctl --system
Step 4: Install Docker
Install and configure Docker:
sudo apt-get update
sudo apt-get install -y ca-certificates curl
sudo install -m 0755 -d /etc/apt/keyrings
sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
sudo chmod a+r /etc/apt/keyrings/docker.asc
echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu \
$(. /etc/os-release && echo "$VERSION_CODENAME") stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
sudo apt-get update
sudo apt-get install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
Step 5: Install Kubernetes Components
Install kubelet, kubeadm, and kubectl:
curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.30/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:/v1.30/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
Step 6: Initialise Kubernetes Cluster
Initialise the cluster with a pod network CIDR:
sudo kubeadm init --pod-network-cidr=10.244.0.0/16
Set up kubectl for the current user:
mkdir -p $HOME/.kube
sudo cp /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
Step 7: Install Flannel Network Plugin
Apply the Flannel CNI plugin to enable networking:
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
Step 8: Verify Setup
Verify the cluster is running correctly:
kubectl get nodes
kubectl get pods -n kube-system