Ubuntu 16.04 Installation

• Download Ubuntu 16.04 ISO http://releases.ubuntu.com/16.04/ubuntu-16.04.5-server-amd64.iso

Create a template VM which will be used to clone all needed VMs

• You need at least 50GB free space to host all VMs
• All VMs will be placed in a directory called (Don’t create these manually now!) DRIVE_NAME:/VMs/ (Replace DRIVE_NAME with a mount point or Driver name)
• Install Ubuntu 16.04 with latest patches
• VM configuration
  • VM Name : k8s-master-01
  • Memory : 2 GB
  • CPU : 2
  • Disk : 100GB
  • HostOnly interface : 1 (ref. step 1).
  • NAT network interface : 1

• Install Ubuntu on this VM and go ahead with all default options

• When asked, provide user name k8s and set password

• Make sure to select the NAT interface as primary during installation.

• Select below in Software Selection screen

• Manual Software Selection

• OpenSSH Server

• After restart , make sure NAT interface is up

• Login to the template VM with user k8s and execute below commands to install latest patches.

$ sudo apt-get update
$ sudo apt-get upgrade

• Poweroff template VM

$ sudo poweroff

Clone VM

You may use VirtualBox GUI to create a full clone - Preferred You can use below commands to clone a VM - Execute it at your own risk ;)

• Open CMD and execute below commands to create all needed VMs. You can replace the value of DRIVER_NAME with a drive which is having enough free space (~50GB)
• Windows

 set DRIVE_NAME=D
 cd C:\Program Files\Oracle\VirtualBox
 VBoxManage.exe clonevm "k8s-master-01" --name "k8s-worker-01" --groups "/K8S Training" --basefolder "%DRIVE_NAME%:\VMs" --register

• Mac or Linux (Need to test)

 DRIVE_NAME=${HOME}
 VBoxManage clonevm "k8s-master-01" --name "k8s-worker-01" --groups "/K8S Training" --basefolder ${DRIVE_NAME}/VMs" --register

Start VMs one by one and perform below

Execute below steps on both master and worker nodes

• Assign IP address and make sure it comes up at boot time.

$ sudo systemctl stop networking
$ sudo vi /etc/network/interfaces

auto enp0s3 #<-- Make sure to use HostOnly interface (it can also be enp0s8)
iface enp0s3 inet static
    address 192.168.56.X #<--- Replace X with corresponding IP octet
    netmask 255.255.255.0

$ sudo systemctl restart networking

• Change Host name

Execute below steps only on worker node

$ HOST_NAME=<host name> # <--- Replace <host name> with corresponding one

$ sudo hostnamectl set-hostname ${HOST_NAME} --static --transient

• Regenrate SSH Keys

$ sudo /bin/rm -v /etc/ssh/ssh_host_*
$ sudo dpkg-reconfigure openssh-server

• Change iSCSI initiator IQN

$ sudo vi /etc/iscsi/initiatorname.iscsi

InitiatorName=iqn.1993-08.org.debian:01:HOST_NAME  #<--- Append HostName to have unique iscsi iqn

• Change Machine UUID

$ sudo rm /etc/machine-id /var/lib/dbus/machine-id
$ sudo systemd-machine-id-setup

Execute below steps on both master and worker nodes

• Remove 127.0.1.1 entry from /etc/hosts

• Add needed entries in /etc/hosts

$ sudo bash -c  "cat <<EOF >>/etc/hosts
192.168.56.201 k8s-master-01
192.168.56.202 k8s-worker-01
EOF"

• Add public DNS incase the local one is not responding in NAT

$ sudo bash -c  "cat <<EOF >>/etc/resolvconf/resolv.conf.d/tail
nameserver 8.8.8.8
EOF"

• Disable swap by commenting out swap_1 LV

$ sudo vi /etc/fstab

# /dev/mapper/k8s--master--01--vg-swap_1 none            swap    sw              0       0

• Reboot VMs

$ sudo reboot