Installation on All Nodes

sudo tee /etc/hosts <<EOF
192.168.1.103 ray
192.168.1.104 mighty
EOF

sudo swapoff -a
sudo sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab

sudo setenforce 0
sudo sed -i --follow-symlinks 's/SELINUX=enforcing/SELINUX=permissive/g' /etc/sysconfig/selinux

sudo firewall-cmd --permanent --add-port=6443/tcp
sudo firewall-cmd --permanent --add-port=10250/tcp
sudo firewall-cmd --reload

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

sudo modprobe overlay
sudo modprobe br_netfilter

cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
EOF

sudo sysctl --system

sudo dnf config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

sudo dnf install -y containerd.io

containerd config default | sudo tee /etc/containerd/config.toml >/dev/null 2>&1

sudo sed -i 's/SystemdCgroup \= false/SystemdCgroup \= true/g' /etc/containerd/config.toml

sudo systemctl enable --now containerd

cat <<EOF | sudo tee /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://pkgs.k8s.io/core:/stable:/v1.33/rpm/
enabled=1
gpgcheck=1
gpgkey=https://pkgs.k8s.io/core:/stable:/v1.33/rpm/repodata/repomd.xml.key
EOF

sudo dnf install -y kubelet kubeadm kubectl

sudo dnf install -y 'dnf-command(versionlock)'

sudo dnf versionlock add kubelet kubeadm kubectl

sudo systemctl enable --now kubelet
  • Run this step on the Control Plane Node only:
sudo kubeadm init --control-plane-endpoint=mighty
  • Run this on the Control Plane Node only:
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

  • Copy the token provided and run it on the Worker Node. Run the command as sudo.

  • Set up Flannel on the Control Plane node:

curl -LO https://raw.githubusercontent.com/flannel-io/flannel/v0.20.2/Documentation/kube-flannel.yml
  • Perform the following:
* Open the `kube-flannel.yml` file.

* You can use a custom POD CIDR, for example `172.17.0.0/16`, instead of the default `10.244.0.0/16` when bootstrapping `Flannel`.

* Need to edit this:

net-conf.json: |
    {
      "Network": "10.244.0.0/16", # Update this to match the custom PodCIDR
      "Backend": {
        "Type": "vxlan"
      }

* Locate the `args` section within the `kube-flannel` container definition.

  args:
  - --ip-masq
  - --kube-subnet-mgr

* Now apply the `Flannel` config:
kubectl apply -f kube-flannel.yml
  • Edit the following file:
/etc/kubernetes/manifests/kube-controller-manager.yaml
  • Add the following lines under - --use-service-account-credentials=true
- --allocate-node-cidrs=true
- --cluster-cidr=172.17.0.0/16

Updated: