Configure OS
swapoff -a
sudo sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
# Stop and disable the firewall
sudo systemctl disable --now firewalld
#
# configure network bridges
#
cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
overlay
br_netfilter
EOF
sudo modprobe overlay
sudo modprobe br_netfilter
# sysctl params required by setup, params persist across reboots
cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.ipv4.ip_forward = 1
EOF
# Apply sysctl params without reboot
sudo sysctl --system
# disable se linux
sudo setenforce 0
sudo sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config
#install docker ce
sudo dnf config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
sudo dnf install -y containerd.io
# Generate default config and enable SystemdCgroup
sudo mkdir -p /etc/containerd
containerd config default | sudo tee /etc/containerd/config.toml >/dev/null
sudo sed -i 's/SystemdCgroup = false/SystemdCgroup = true/g' /etc/containerd/config.toml
sudo systemctl restart containerd
sudo systemctl enable containerd
#
# add kubernet repos
#
cat <<EOF | sudo tee /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://cdn.opensuse.org/repositories/isv:/kubernetes:/core:/stable:/v1.32/rpm/
enabled=1
gpgcheck=1
gpgkey=https://cdn.opensuse.org/repositories/isv:/kubernetes:/core:/stable:/v1.32/rpm/repodata/repomd.xml.key
EOF
# Install specific version 1.32.7
sudo dnf install -y kubelet-1.32.7 kubeadm-1.32.7 kubectl-1.32.7 --disableexcludes=kubernetes
# Enable and start the kubelet
sudo systemctl enable --now kubelet
sudo kubeadm init --kubernetes-version=1.32.7 --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
export KUBECONFIG=/etc/kubernetes/admin.conf
echo 'export KUBECONFIG=/etc/kubernetes/admin.conf' >> ~/.bashrc
source ~/.bashrc
kubectl apply -f https://github.com/flannel-io/flannel/releases/latest/download/kube-flannel.yml
Remove tains for single node
kubectl describe node | grep Taints
Taints: node-role.kubernetes.io/control-plane:NoSchedule
# Remove the control-plane taint
kubectl taint nodes --all node-role.kubernetes.io/control-plane-Deploy simple pods
kubectl run my-pod --image=nginx