Creating a Private Ubuntu Image

V1.0 – November 2023

Version	Author	Description
V1.0 – 2023-11-20	Wisley da Silva Paulo 00830850	Initial version

Objective

This document aims to present the necessary procedures for creating an Ubuntu 20.04 image with UEFI using the IMS service.

Creating an Ubuntu image

Download the Ubuntu Server ISO image (example - https://releases.ubuntu.com/focal/) and upload it to OBS.

Import the Ubuntu ISO image into the IMS service.

Note: At the time of creating this document, when we select UEFI and Ubuntu, the options for versions 18.04 and 20.04 do not appear, but this was reported to the product team, who informed us and the change will be made in December 2023. At that time, you can select the 16.04 option and the system will work normally.

Create an ECS using the image created by importing the ISO image.

Access the instance and open the shell terminal

Install KVM

Add the virtio drivers to the file: “/etc/initramfs-tools/modules”:

nano /etc/initramfs-tools/modules

virtio_blk
virtio_scsi
virtio_net
virtio_pci
virtio_ring
virtio

update-initramfs -u

Install and start openssh

apt update
apt install openssh-server -y
service sshd start

Configure sshd.conf

nano /etc/ssh/sshd_config

Install and configure cloud-init

(apt install cloud-init is not working for version 20.04, install version 23 and it has compatibility issues)

apt remove cloud-init
apt purge cloud-init
rm -rf /var/lib/cloud/*
rm -rf /var/log/cloud-init*
rm -rf /var/lib/cloud
rm -rf /etc/cloud
rm -rf /usr/local/bin/cloud*
apt update
apt install cloud-guest-utils -y
apt install python3-pip -y
apt install python3-devel
wget https://launchpad.net/cloud-init/trunk/19.1/+download/cloud-init-19.1.tar.gz
tar -zxvf cloud-init-19.1.tar.gz
cd cloud-init-19.1
pip3 install -r ./requirements.txt
python3 setup.py install
cloud-init -v
cloud-init init --local

nano /etc/cloud/cloud.cfg

Change the parameters as shown in the images, add the lines at the end of the file:

- name: root
   lock_passwd: False

ssh_pwauth: true

datasource_list: [ OpenStack ]
datasource:
  OpenStack:
    metadata_urls: ['http://169.254.169.254']
    max_wait: 120
    timeout: 5
    apply_network_config: false
network:
  config: disabled

Check cloud-init, if any error occurs try restarting the instance and run the command again:

sudo cloud-init init --local