KVM: Create Windows 7 VM

Virtio driver
https://fedorapeople.org/groups/virt/virtio-win/deprecated-isos/stable/virtio-win-0.1-81.iso

Create VM

DISKIMG=win7.img
WIN7IMG=../iso/de_windows_7_professional_with_sp1_x64_dvd_u_676919.iso
VIRTIMG=../iso/virtio-win-0.1-81.iso
 
sudo qemu-system-x86_64 \
    --enable-kvm \
    -m 4096 \
    -smp cores=2 \
    -drive file=${DISKIMG},if=virtio \
    -net nic,model=virtio \
    -net user \
    -rtc base=localtime,clock=host \
    -usbdevice tablet \
    -soundhw ac97 \
    -cpu host \
    -vga std
 
    -vga qxl \
 
    -drive file=${VIRTIMG},index=3,media=cdrom \
    -cdrom ${WIN7IMG} \
 
    -vga vmware

Docker: HAProxy

Container
https://hub.docker.com/_/haproxy

Configuration
/tmp/haproxy/haproxy.cfg

global
  maxconn 4096
  #stats timeout 30s
  #debug
 
defaults
  log global
  mode http
  option httplog
  option dontlognull
  timeout connect 5000
  timeout client 50000
  timeout server 50000
  log 127.0.0.1 local0
  #option httpchk
 
frontend frontend1
  bind :80
  mode http
  use_backend backend1
 
backend backend1
  mode http
  balance roundrobin
  option httpchk GET / HTTP/1.1
  http-check expect status 400
  server www1 172.17.0.2:80 check
  server www2 172.17.0.4:80 check
  server www3 172.17.0.6:80 check
 
listen stats 
  bind :9000
  mode http
  stats enable
  stats hide-version
  stats realm Haproxy\ Statistics
  stats refresh 60s
  stats show-node
  stats auth haproxy:password
  stats uri /

Deploy

docker run -d --name haproxy -v /tmp/haproxy:/usr/local/etc/haproxy:ro -p 8080:80 -p 9000:9000 haproxy:latest
docker logs -f  haproxy

LXD: Create container with HTTP(s) proxy

CONTAINER=haproxy
 
# Create container
lxc launch ubuntu:18.04 ${CONTAINER}
sleep 10
 
# Deploy SSH key
lxc file push --uid 0 --gid 0 --mode 600 ~/.ssh/id_rsa.pub ${CONTAINER}/root/.ssh/authorized_keys
 
# Configure http(s) proxy inside of container (if set on host)
[ -z ${http_proxy} ] || echo "export http_proxy=$http_proxy" | lxc shell ${CONTAINER} -- tee -a /etc/environment
[ -z ${https_proxy} ] || echo "export https_proxy=$https_proxy" | lxc shell ${CONTAINER} -- tee -a /etc/environment
 
# Update APT repository
lxc exec ${CONTAINER} -- bash -c ". /etc/environment && apt update"
 
# Optional: install applications
lxc exec ${CONTAINER} -- bash -c ". /etc/environment && apt install -y haproxy"

YouTube download and convert to mp3

https://yt-dl.org/update
https://github.com/ytdl-org/youtube-dl/releases

wget -q https://github.com/ytdl-org/youtube-dl/releases/download/2019.04.30/youtube-dl -O /tmp/youtube-dl
sudo cp /tmp/youtube-dl /usr/local/sbin/
sudo chmod a+x /usr/local/sbin/youtube-dl
 
# download audio (mp3) only
youtube-dl --extract-audio --audio-format mp3 -o "%(title)s.%(ext)s" https://www.youtube.com/watch?v=foo
 
# download whole channel starting from 3 months
youtube-dl --extract-audio --audio-format mp3 -o "%(upload_date)s_%(title)s.%(ext)s" --dateafter now-3months -v https://www.youtube.com/user/OpenStackFoundation/videos
 
# update
sudo youtube-dl -U

# output template
https://github.com/ytdl-org/youtube-dl/blob/master/README.md#output-template

Install tftp server

Install tftp server package
sudo apt-get install -y xinetd tftpd tftp

Create xinetd tftp configuration

cat <<EOF> /etc/xinetd.d/tftp
service tftp
{
protocol        = udp
port            = 69
socket_type     = dgram
wait            = yes
user            = nobody
server          = /usr/sbin/in.tftpd
server_args     = /tftpboot
disable         = no
}
EOF

Create /tftpboot folder

sudo mkdir /tftpboot
sudo chmod -R 777 /tftpboot
sudo chown -R nobody /tftpboot

Restart the xinetd service

sudo service xinetd restart

Testing our tftp server

ip a add 192.168.1.1/24 dev eth0:1
echo foo > /tftpboot/testfile
tftp 192.168.1.1
get testfile
quit

Links
https://askubuntu.com/questions/201505/how-do-i-install-and-run-a-tftp-server

OpenStack: Volume

# List your volumes
openstack volume list
 
openstack volume type list --public --long
openstack volume backend pool list
cinder --os-volume-api-version 3.50 attachment-delete <attachment_id>
 
openstack volume set --non-bootable <VOLUME_ID>

Search for multiple volume attachment ids

OpenStack: rescue / recovery system

Download rescure iso
wget http://download.grml.org/grml64-small_2018.12.iso

Create rescure system

openstack image create systemrescuecd \
  --file grml64-small_2018.12.iso \
  --disk-format iso \
  --container-format bare \
  --min-ram 512 \
  --property hw_cdrom_bus=scsi
 
# show image
openstack image list --name systemrescuecd

Attach rescure system

openstack server rescue --image systemrescuecd ${SERVER_ID}

# Login to VM console and fix issues
Detach rescure system

openstack server unrescue ${SERVER_ID}

Links
https://help.switch.ch/engines/documentation/rescue-vm/
https://grml.org/

OpenStack: User

Debug user
openstack user list
openstack user show USER_ID
openstack domain show DOMAIN_ID
openstack project list --user USER_ID
openstack role assignment list --names --user USER_ID

Add role
openstack role add --user USER_ID --project PROJECT_ID creator