Open Stack

On Tue, Feb 05, 2019 at 10:45:27PM +0000, Manuel Sopena Ballesteros wrote:
> Dear Openstack community,
> 
> I am trying to create a new image for Ironic. I followed the
> documentation but got an error with virt-install.

[...]

> Please note:
> 
> The OS has been reinstalled The host is a physical machine BIOS has
> virtualization enabled I changed /etc/libvirt/qemu.conf group from
> root to kvm following some linux forum instructions about this error
> but the issue persists

That's fine.  Please also post your host kernel, QEMU and libvirt
versions.

> # virt-install --virt-type kvm --name centos --ram 1024   --disk
> /tmp/centos.qcow2,format=qcow2   --network network=default
> --graphics vnc,listen=0.0.0.0 --noautoconsole   --os-type=linux
> --os-variant=centos7.0
> --location=/root/CentOS-7-x86_64-NetInstall-1810.iso
> 
> 
> Starting install...
> 
> Retrieving file .treeinfo...
> |    0 B  00:00:00 Retrieving file content...
> |    0 B  00:00:00 Retrieving file vmlinuz...
> | 6.3 MB  00:00:00 Retrieving file initrd.img...
> |  50 MB  00:00:00 ERROR    unsupported configuration: CPU mode
> 'custom' for x86_64 kvm domain on x86_64 host is not supported by
> hypervisor Domain installation does not appear to have been
> successful.

That error means a low-level QEMU command (that queries for what vCPUs
QEMU supports) has failed for "some reason".

To debug this, we need /var/log/libvirt/libvirtd.log with log filters.

(a) Remove this directory and its contents (this step is specific to
    this problem; it's not always required):

    $ rm /var/cache/libvirt/qemu/

(b) Set the following in your /etc/libvirt/libvirtd.conf:

    log_filters="1:libvirt 1:qemu 1:conf 1:security 3:event 3:json 3:file 3:object 1:util 1:cpu"
    log_outputs="1:file:/var/log/libvirt/libvirtd.log"

(c) Restart libvirtd: `systemctl restart libvirtd`

(d) Repeat the test; and post the /var/log/libvirt/libvirtd.log
    somewhere.

[...]

BTW, I would highly recommend the `virt-builder` approach to create
disk images for various operating systems and importing it to libvirt.

(1) Download a CentOS 7.6 template (with latest updates) 20G of
    disk:

    $ sudo dnf install libguestfs-tools-c

    $ virt-builder centos-7.6 --update -o centos-vm1.qcow2 \
        --selinux-relabel --size 20G

(2) Import the downloaded disk image into libvirt:

    $ virt-install \
       --name centosvm1 --ram 2048 \
       --disk path=centos.img,format=qcow2 \
       --os-variant centos7.0 \
       --import

    Note-1: Although the command is called `virt-install`, we aren't
    _installing_ anything in this case.

    Note-2: The '--os-variant' can be whatever the nearest possible
    variant that's available on your host.  To find the list of variants
    for your current Fedora release, run: `osinfo-query os | grep
    centos`.  (The `osinfo-query` tool comes with the 'libosinfo'
    package.)

The `virt-builder` tool is also available in Debian and Ubuntu.

[...]

-- 
/kashyap