centos 8 kubernates install

centos-8-kubernates-install.sh

#!/bin/sh
set -e

if [[ $EUID -ne 0 ]]; then
   echo "$0 must be run as root" 
   exit 1
fi

dnf install -y libselinux-utils # setenforce
setenforce 0
sed -i --follow-symlinks 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/sysconfig/selinux

dnf install firewalld -y
firewall-cmd --permanent --add-port=6443/tcp
firewall-cmd --permanent --add-port=2379-2380/tcp
firewall-cmd --permanent --add-port=10250/tcp
firewall-cmd --permanent --add-port=10251/tcp
firewall-cmd --permanent --add-port=10252/tcp
firewall-cmd --permanent --add-port=10255/tcp
firewall-cmd –reload
modprobe br_netfilter
echo '1' > /proc/sys/net/bridge/bridge-nf-call-iptables

###
#   Install Docker
###
dnf config-manager --add-repo=https://download.docker.com/linux/centos/docker-ce.repo
dnf install https://download.docker.com/linux/centos/7/x86_64/stable/Packages/containerd.io-1.2.6-3.3.el7.x86_64.rpm -y
dnf install docker-ce -y
systemctl enable docker
systemctl start docker

###
#   Install Kubernates
###
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
EOF

dnf install kubeadm -y
systemctl enable kubelet
systemctl start kubelet
swapoff -a
set -e
kubeadm init $@
if [ $? -eq 0 ]; then
    mkdir -p $HOME/.kube
    cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
    chown $(id -u):$(id -g) $HOME/.kube/config
    kubectl get nodes
else
    echo "Error while initalizing kubernates. Check errors"
fi