Virtualization (virsh)
Notes about using virsh
and related commands
Installation
Simple installation (using a vnc "display")
virt-install -n myvm \
--memory 16384 \
--cpu host \
--cdrom /path/to/rhel8.4.iso \
--disk size=50 \
--graphics vnc,port=5901,listen=0.0.0.0,password=myvncpass \
--network default \
--vcpus 2 \
--os-variant rhel8.4
or rebuild from a disk image with all the same settings, by changing:
virt-install -n myvm \
... \
# size=50 becomes...
--disk /path/to/existing/disk.qcow2 \
... \
# remove --cdrom /path/to/rhel8.4.iso
--import \
...
Which is helpful if the qemu XML file gets removed/deleted
once configuration/install is done then console=ttyS0,115200
can be
added to the kernel parameters and one can attach to the machine console
via virsh console myvm
attaching
disks
A block device can be directly attached
virsh attach-disk --domain myvm /dev/sda1 vdb --config --type disk
usb device
Need the code for the usb (e.g. lsusb -v
) to place into the following file
vim usbdevice.xml
---
<hostdev mode='subsystem' type='usb' managed='yes'>
<source>
<vendor id='0x1234'/>
<product id='0x5678'/>
</source>
</hostdev>
Which can be attached to a machine
virsh attach-device myvm --file usbdevice.xml --config --persistent
The detach-device
command can work to detach the usb device too