Kubernetes Cluster

Disable swap on each node

sudo swapoff -
sudo sed -i '/ swap / s/^/#/' /etc/fstab

Set up hostnames on each node

sudo hostnamectl set-hostname "dh-ubuntu-0"
exec bash

Update the /etc/hosts File for Hostname Resolution on each node

192.168.50.30 dh-ubuntu-0
192.168.50.31 dh-ubuntu-1
192.168.50.32 dh-ubuntu-2

Set up the IPV4 bridge on each node

cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
overlay
br_netfilter
EOF

sudo modprobe overlay
sudo modprobe br_netfilter

# sysctl params required by setup, params persist across reboots
cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-iptables  = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.ipv4.ip_forward                 = 1
EOF

# Apply sysctl params without reboot
sudo sysctl --system

Install kubelet, kubeadm, and kubectl on each node

sudo apt-get update
sudo apt-get install -y apt-transport-https ca-certificates curl
sudo mkdir /etc/apt/keyrings
curl -fsSL https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-archive-keyring.gpg
echo "deb [signed-by=/etc/apt/keyrings/kubernetes-archive-keyring.gpg] https://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list
sudo apt-get update
sudo apt install -y kubelet=1.26.5-00 kubeadm=1.26.5-00 kubectl=1.26.5-00

Install Docker on each node

sudo apt install docker.io
sudo mkdir /etc/containerd
sudo sh -c "containerd config default > /etc/containerd/config.toml"
sudo sed -i 's/ SystemdCgroup = false/ SystemdCgroup = true/' /etc/containerd/config.toml
sudo systemctl restart containerd.service
sudo systemctl restart kubelet.service
sudo systemctl enable kubelet.service

Initialize the Kubernetes cluster on the master node

sudo kubeadm config images pull
sudo kubeadm init --pod-network-cidr=10.10.0.0/16
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

Configure kubectl and Calico on the master node

kubectl create -f https://raw.githubusercontent.com/projectcalico/calico/v3.26.1/manifests/tigera-operator.yaml
curl https://raw.githubusercontent.com/projectcalico/calico/v3.26.1/manifests/custom-resources.yaml -O
sed -i 's/cidr: 192\.168\.0\.0\/16/cidr: 10.10.0.0\/16/g' custom-resources.yaml
kubectl create -f custom-resources.yaml

Add worker nodes to the cluster

sudo kubeadm join <MASTER_NODE_IP>:<API_SERVER_PORT> --token <TOKEN> --discovery-token-ca-cert-hash <CERTIFICATE_HASH>

Verify the cluster and test

kubectl get no
kubectl get po -A

Install Helm README.md
Install Calico README.md
Install NFS README.md
Install MetalLB README.md
Install NGinX README.md
Install cert-manager README.md
Install portainer README.md

gavanlamb/kubernetes-cluster

Kubernetes Cluster