-- virsh usefull commands
-------------------------
# create new domain
virt-install \
  --graphics vnc,listen=0.0.0.0 \
  --name=mandalore \
  --vcpus=2 \
  --memory=4096 \
  --network bridge=br0 \
  --network bridge=br0 \
  --cdrom=/mnt/yavin4/kit/CentOS/CentOS-8.2.2004-x86_64-minimal.iso \
  --disk /datastore/mandalore/hdd_01.img,size=6 \
  --os-variant=centos8

# get OS Variant
osinfo-query os

# destroy a domain
virsh destroy mandalore

# delete VM and underlying storage
virsh undefine mandalore --remove-all-storage


# adding disk to VM
# on Dom0 create the disk (RAW format in exemple)
qemu-img create -f raw /datastore/mandalore/app_01.img 8G
# change the owner of the image ad permissions
chown qemu:qemu /datastore/mandalore/app_01.img
chmod 600 /datastore/mandalore/app_01.img
# on DomU list block devices
lsblk
# or to have the sorted list of block devices
fdisk -l | grep '^Disk /dev/vd[a-z]'
# pick the next available device, ex: vdb
# return to Dom0 and attach the disk
virsh attach-disk mandalore /datastore/mandalore/app_01.img vdb --driver qemu --subdriver raw --targetbus virtio --persistent
# to list the disk of a domain, execute from Dom0:
virsh domblklist seedmachine --details

# to detach a disk
virsh detach-disk mandalore vdb --persistent


# to list the network interfaces of a domain, execute from Dom0:
virsh domiflist mandalore
# add network interface
virsh attach-interface --domain vortex-db01 --type bridge --source br0 --model virtio --persistent
# remove network interface
virsh detach-interface --domain ylesia-db01 --mac 52:54:00:8f:40:3c --type bridge


# dump domain XML config file
virsh dumpxml mandalore

# define domain from XML config file
virsh define --file /mnt/yavin4/tmp/seedmachine.xml


# list all defined pool on Dom0
virsh pool-list --all

# deleting a pool
virsh pool-destroy atrisia1
virsh pool-undefine atrisia1

# import (define) VM from XML file
virsh define /mnt/yavin4/data/d.backup_vm/KVM_seed/Centos8_2020-10-25/seedmachine.xml

# clone VM
virt-clone \
	--original mandalore \
	--name ossus \
	--file /datastore/ossus/hdd_01.img \
	--file /datastore/ossus/app_01.img 
    
# KVM BUG: error: internal error: unknown feature amd-sev-es
Workaround:
mkdir -p /etc/qemu/firmware
touch /etc/qemu/firmware/50-edk2-ovmf-cc.json

# Install KVM on CentOS8
https://www.cyberciti.biz/faq/how-to-install-kvm-on-centos-8-headless-server/

# Online unicast MAC adress generator for network interface
https://www.hellion.org.uk/cgi-bin/randmac.pl

# Static MAC Generator for KVM
# from http://blog.zencoffee.org/2016/06/static-mac-generator-kvm/
MAC=$(date +%s | md5sum | head -c 6 | sed -e 's/\([0-9A-Fa-f]\{2\}\)/\1:/g' -e 's/\(.*\):$/\1/' | sed -e 's/^/52:54:00:/')
echo $MAC