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setup-kubetools-new.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