notes on VM management + libvirt/kvm/qemu
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resources:
https://rabexc.org/posts/how-to-get-started-with-libvirt-on
https://wiki.libvirt.org/VM_lifecycle.html


networking:
https://wiki.libvirt.org/VirtualNetworking.html#the-default-configuration

https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/6/html/virtualization_administration_guide/sect-network_address_translation-libvirt#sect-DNS_and_DHCP-protocols-libvirt

need:
  - dnsmasq
  - dmidecode
  - guestfs-tools

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net tools
  - netstat (net-tools)

  $ netstat -nulp
  $ netstat -ntlp

  $ ip address show

  $ sudo iptables -nvL
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virsh

connect:

  virsh -c qemu:///system

starting, resuming, restoring

  virsh start domain --console

net (#virsh)

  net-list --all
  net-dumpxml
  net-undefine  <name>
  net-define    file.xml
  net-start     <name>
  net-autostart <name>
  net-destroy   <name>

DHCP
  net-dhcp-leases <name>

storage

  pool-list --all
  vol-list <pool-name>

snapshot

  snapshot-create-as <domain> --name "name" --description "desc"

VM CREATION

  virt-install \
    -n alpine-virt-volatile \
    --ram 4096 \
    --vcpus=4  \
    --cpu=host \
    -c ./images/alpine-virt-3.22.1-x86_64.iso \
    --os-variant=alpinelinux3.23 \
    --disk=pool=vdisk,size=10,format=qcow2 \
    -w network=default \
    --graphics=vnc \
    --connect qemu:///system

clone from existing VM:
  virt-clone --original [orig] --name [new] --file [path/to/vdisk/qcow2]


CDROM
    <disk type='file' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <source file='/home/shrik3/vm/images/alpine-virt-3.23.3-x86_64.iso' index='1'/>
      <backingStore/>
      <target dev='sda' bus='sata'/>
      <readonly/>
      <alias name='sata0-0-0'/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>


FUCK NETWORKING.


Domains (VMs)

  list --all

remove a domain
  undefine [domain] --managed-save --remove-all-storage --wipe-storage --snapshots-metadata --nvram