How to install Kubernetes

In this tutorial, we will be installing Kubernetes (k8s) cluster. The cluster will have 1 master and 2 nodes.

Prerequisites

To complete this tutorial, we will need 3 nodes running Debian Stretch. This tutorial will work too on nodes running Ubuntu Xenial.

Node informations

node1 = k8s2001.tx.labnet = master node / IP address 10.64.0.14

node2 = k8s2002.tx.labnet / IP address 10.64.0.15

node3 = k8s2003.tx.labnet / IP address 10.64.0.16

make sure that all nodes can talk to each other. Like in all my turorials, I have a DHCP server and a DNS server running in my environment so no need for me to manually edit my /etc/hosts file. But, if you do not have a DHCP and DNS server in your environment, please edit your /etc/hosts file.

• master node

ppaul@k8s2001:~$ cat /etc/hosts
127.0.0.1	localhost
10.64.0.14	k8s2001.tx.labnet	k8s2001
# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

K8s Installation

Create a file called k8s_install.sh on all nodes and copy and paste the script below into the file.save the file and make the file executable.

vi k8s_install.sh

#!/bin/bash
sudo swapoff -a
# Install Docker
sudo apt-get install apt-transport-https ca-certificates curl software-properties-common -y
sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add -
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/debian $(lsb_release -cs) stable"
sudo apt-get update -y
sudo apt-get install docker-ce -y
# Install kubernetes
sudo curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
sudo echo 'deb http://apt.kubernetes.io/ kubernetes-xenial main' | sudo tee /etc/apt/sources.list.d/kubernetes.list
apt-get update -y
apt-get install kubelet kubeadm kubectl -y