Virtual Machine Ubuntu 20.04

Using the Openstack command line interface it is possible to access a larger number of images, including Ubuntu ones (these are not officially supported by IT, but are available).

The following is largely based on these documentation pages:

The openstack command line interface is available on lxplus8.cern.ch.

ssh lxplus8.cern.ch

Create the machine

On lxplus8, by default you will work on your personal OpenStack space. You can switch to a given openstack project by running the script downloadable from the first link

source openstack_sixtrack.sh

To list the available images and see the ubuntu ones:

openstack image list --community | grep -i ubuntu

Create an rsa key pair and provide it to openstack:

ssh-keygen -t rsa
openstack keypair delete lxplus # I want to start clean (but probably not needed)
openstack keypair create --public-key ~/.ssh/id_rsa.pub lxplus

To correctly configure the DNS you need to create the following config file:

vim ubuntu-systemd-resolved.yaml

Type:

#cloud-config
bootcmd:
- printf "[Resolve]\nDNS=137.138.16.5 137.138.17.5\n" > /etc/systemd/resolved.conf
- [systemctl, restart, systemd-resolved]

Create the virtual machine:

openstack server create --user-data ubuntu-systemd-resolved.yaml --flavor m2.large --image f3799482-e852-4a77-9383-408370b81df6 --key-name lxplus xboinc-ubuntu-build

You can monitor the creation process from https://openstack.cern.ch/ or by typing:

openstack server show xboinc-ubuntu-build

Wait until the state is active or running.

Configuring the machine

Connect via ssh (login: ubuntu, authentication with rsa key).

ssh ubuntu@xboinc-ubuntu-build

Update and test apt install and graphical interface:

sudo apt update
sudo apt upgrade
sudo apt install gedit
gedit

Add admin user:

sudo adduser giadarol
sudo usermod -aG sudo giadarol

Enable password authentication

This is done by editing a configuration file:

sudo vim /etc/ssh/sshd_config

Inside the file set:

PasswordAuthentication yes

Restart ssh:

sudo systemctl restart sshd

Install graphical interface

Install graphical interface (based on this guide):

sudo apt install slim # select slim
sudo apt install ubuntu-desktop
sudo reboot

The console on openstack restarts in graphical mode