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setup-kubetools-new-PRERELEASE.sh

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+#!/bin/bash
+# kubeadm installation instructions as on
+# https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/install-kubeadm/
+
+# this script supports centos 7 and Ubuntu 20.04 only
+# run this script with sudo
+
+if ! [ $USER = root ]
+then
+	echo run this script with sudo
+	exit 3
+fi
+
+# setting MYOS variable
+MYOS=$(hostnamectl | awk '/Operating/ { print $3 }')
+OSVERSION=$(hostnamectl | awk '/Operating/ { print $4 }')
+
+##### CentOS 7 config
+if [ $MYOS = "CentOS" ]
+then
+	echo RUNNING CENTOS CONFIG
+	cat <<EOF | sudo tee /etc/yum.repos.d/kubernetes.repo
+[kubernetes]
+name=Kubernetes
+baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-\$basearch
+enabled=1
+gpgcheck=1
+repo_gpgcheck=1
+gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
+exclude=kubelet kubeadm kubectl
+EOF
+
+	# Set SELinux in permissive mode (effectively disabling it)
+	setenforce 0
+	sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config
+
+	# disable swap (assuming that the name is /dev/centos/swap
+	sed -i 's/^\/dev\/mapper\/centos-swap/#\/dev\/mapper\/centos-swap/' /etc/fstab
+	swapoff /dev/mapper/centos-swap
+
+	yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes
+
+	systemctl enable --now kubelet
+fi
+
+if [ $MYOS = "Ubuntu" ]
+then
+	
+	sudo apt-get update
+	sudo apt-get install -y apt-transport-https ca-certificates curl
+	sudo curl -fsSLo /usr/share/keyrings/kubernetes-archive-keyring.gpg https://packages.cloud.google.com/apt/doc/apt-key.gpg
+	echo "deb [signed-by=/usr/share/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-get install -y kubelet kubeadm kubectl
+	sudo apt-mark hold kubelet kubeadm kubectl
+	swapoff /swapfile
+	
+	sed -i 's/swapfile/#swapfile/' /etc/fstab
+
+	
+fi
+
+# Set iptables bridging
+cat <<EOF >  /etc/sysctl.d/k8s.conf
+net.bridge.bridge-nf-call-ip6tables = 1
+net.bridge.bridge-nf-call-iptables = 1
+EOF
+sysctl --system