Kvm notes sandbox

Good links

openSUSE Guide
RHEL Guide

Forward kvm host qemu vnc with ssh

$ ssh -L 5900:localhost:5900 <kvm-host-ip> -N

Create guest

# virt-install --name <name> --connect qemu:///system --virt-type kvm --memory 30720 --vcpus 8 --nodisks \
--os-variant opensuse42 --network bridge=br0 --boot=hd --pxe --vnc --vnclisten=localhost --vncport=5900

Virsh

---

List all guests even not started

# virsh list --all

Guest migration

Dump config

# virsh dumpxml --migratable <guest-name> >guest-name.xml

Restore guest config on new host

# virsh define guest-name.xml

Edit guest with virsh

# virsh edit guest-name

Attach block device to guest

Create xml config for example vda.xml

<disk type='block' device='disk'>
      <driver name='qemu' type='raw' cache='none'/>
      <source dev='/dev/sda5'/>
      <target dev='vda' bus='virtio'/>
</disk>

Permanently attach block device to already existing domain

# virsh attach-disk <domain-name> vda.xml --persistent

Connect to console with virsh

Add serial console to guest, virsh edit guest

 <devices>
    <serial type='pty'>
      <target port='0'/>
    </serial>
    <console type='pty'>
      <target type='serial' port='0'/>
    </console>

connect to guest console:

# virsh console guest-name

Clonning guest

It it possible to clone with virsh dumpxml, but dont forget to change uuid, mac and vm name.

KVM basebox notes

1. Add console=ttyS0 into bootloader cmdline for virsh console to work. (require syslinux package)
2. Install package rsyslog (this probably will remove journald package) and start rsyslog.service