swapoff /dev/xxx
# disable in /etc/fstab also
systemctl mask --now firewalld
echo br_netfilter >> /etc/modules-load.d/kubernetes.conf
modprobe br_netfilter
sysctl -w net.ipv4.ip_forwarding=1 | tee -a /etc/sysctl.conf
sysctl -w net.bridge.bridge-nf-call-iptables=1 | tee -a /etc/sysctl.conf
sysctl -w net.bridge.bridge-nf-call-ip6tables=1 | tee -a /etc/sysctl.conf

cat <<EOF | sudo tee /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-\$basearch
enabled=1
gpgcheck=1
gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
exclude=kubelet kubeadm kubectl
EOF

export OS=CentOS_8
export VERSION=1.24
curl -L -o /etc/yum.repos.d/devel:kubic:libcontainers:stable.repo https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/$OS/devel:kubic:libcontainers:stable.repo
curl -L -o /etc/yum.repos.d/devel:kubic:libcontainers:stable:cri-o:$VERSION.repo https://download.opensuse.org/repositories/devel:kubic:libcontainers:stable:cri-o:$VERSION/$OS/devel:kubic:libcontainers:stable:cri-o:$VERSION.repo
dnf makecache
dnf install -y kubelet-1.24.0 kubeadm-1.24.0 kubectl-1.24.0 crio
sudo setenforce 0
sudo sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config
sudo systemctl enable --now kubelet crio
kubeadm init --apiserver-advertise-address=10.75.254.1 --pod-network-cidr=10.244.0.0/16

# Take note of the join command

kubectl apply -f https://raw.githubusercontent.com/flannel-io/flannel/master/Documentation/kube-flannel.yml
kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/v0.13.4/config/manifests/metallb-native.yaml

kubectl create secret generic -n metallb-system memberlist --from-literal=secretkey="$(openssl rand -base64 128)"

# change address pool below
cat <<EOF>metallb-addresspool.yaml
apiVersion: metallb.io/v1beta1
kind: IPAddressPool
metadata:
  name: first-pool
  namespace: metallb-system
spec:
  addresses:
  - 192.168.1.101-192.168.1.199
---
apiVersion: metallb.io/v1beta1
kind: L2Advertisement
metadata:
  name: example
  namespace: metallb-system
EOF

kubectl apply -f metallb-addresspool.yaml