Quote from moshe on 23/10/2020, 9:16 pm

Before starting make sure you configured permanent hostnames for the master and worker nodes this can be done editing /etc/hosts file or using command :

hostnamectl set-hostname master

and on the worker node

hostnamectl set-hostname workder1

Configure Kubernetes Repository – packages not available in the official Repos

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

Run installation commands

sudo yum install -y kubelet kubeadm kubectl

Enable and Start Service

systemctl enable kubelet
systemctl start kubelet

if firewald is running enable the following ports

sudo firewall-cmd –permanent –add-port=6443/tcp
sudo firewall-cmd –permanent –add-port=2379-2380/tcp
sudo firewall-cmd –permanent –add-port=10250/tcp
sudo firewall-cmd –permanent –add-port=10251/tcp
sudo firewall-cmd –permanent –add-port=10252/tcp
sudo firewall-cmd –permanent –add-port=10255/tcp
sudo firewall-cmd –reload

and for the worker nodes

sudo firewall-cmd –permanent –add-port=10251/tcp
sudo firewall-cmd –permanent –add-port=10255/tcp
firewall-cmd –reload

Disable selinux

sudo setenforce 0
sudo sed -i ‘s/^SELINUX=enforcing$/SELINUX=disabled/’ /etc/selinux/config

disable swap

sudo sed -i ‘/swap/d’ /etc/fstab
sudo swapoff -a