qemu-kvm: -fw_cfg: invalid option

[Karl Nordstrom]

I'm following the directions in:

https://kinvolk.io/docs/flatcar-container-linux/latest/installing/vms/libvirt/

I'm trying to start a flatcar linux with:

# virsh start flatcar-linux1

I am getting error messages:

error: Failed to start domain flatcar-linux1
error: internal error: process exited while connecting to monitor: qemu-kvm: -fw_cfg: invalid option

I edited domain.xml to have these changs:

# head -1 domain.xml
<domain xmlns:qemu="http://libvirt.org/schemas/domain/qemu/1.0" type="kvm">

# tail -6 domain.xml
  <qemu:commandline>
    <qemu:arg value="-fw_cfg"/>
    <qemu:arg value="name=opt/org.flatcar-linux/config,file=/var/lib/libvirt/flatcar-linux/flatcar-linux1/provision.ign"/>
  </qemu:commandline>
</domain>

The I defined domain flatcar-linux1

virsh define /var/lib/libvirt/flatcar-linux/flatcar-linux1/domain.xml

Does anyone have a suggestion on how to get this to work?

Thanks

[Karl Nordstrom]

qemu-kvm.x86_64 10:1.5.3-175.el7_9.4

# virsh -version
4.5.0

CentOS Linux release 7.9.2009 (Core)

[Kai Lüke]

Hello,

I used https://github.com/kinvolk/flatcar-terraform/tree/main/qemu-libvirt
to create the machine in the libvirt system session.
Here is the resulting XML config if it helps, but it uses the same
flag as yours. What is your QEMU version?
The flag is also used by
https://stable.release.flatcar-linux.net/amd64-usr/current/flatcar_production_qemu.sh
when you pass the "-i IGNITIONFILE" flag, maybe worth to check if that
also fails for you.

Regards,
Kai

<domain xmlns:qemu="http://libvirt.org/schemas/domain/qemu/1.0" type="kvm">

<name>tftest-mynode</name>
<uuid>545b8017-9ded-4533-9f93-c75352f34187</uuid>
<memory unit="KiB">786432</memory>
<currentMemory unit="KiB">786432</currentMemory>
<vcpu placement="static">1</vcpu>
<os>
<type arch="x86_64" machine="pc-i440fx-5.2">hvm</type>
<boot dev="hd"/>
</os>
<features>
<acpi/>
<apic/>
<pae/>
</features>
<cpu mode="custom" match="exact" check="none">
<model fallback="forbid">qemu64</model>
</cpu>
<clock offset="utc"/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/usr/bin/qemu-system-x86_64</emulator>
<disk type="volume" device="disk">
<driver name="qemu" type="qcow2"/>
<source pool="tftest-pool"
volume="tftest-mynode-821f5a9e9c377a188af7507b91f8169d.qcow2"/>
<target dev="vda" bus="virtio"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x05"
function="0x0"/>
</disk>
<controller type="usb" index="0" model="piix3-uhci">
<address type="pci" domain="0x0000" bus="0x00" slot="0x01"
function="0x2"/>
</controller>
<controller type="pci" index="0" model="pci-root"/>
<controller type="virtio-serial" index="0">
<address type="pci" domain="0x0000" bus="0x00" slot="0x04"
function="0x0"/>
</controller>
<interface type="network">
<mac address="52:54:00:4a:54:81"/>
<source network="default"/>
<model type="virtio"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x03"
function="0x0"/>
</interface>
<channel type="unix">
<target type="virtio" name="org.qemu.guest_agent.0"/>
<address type="virtio-serial" controller="0" bus="0" port="1"/>
</channel>
<input type="mouse" bus="ps2"/>
<input type="keyboard" bus="ps2"/>
<graphics type="spice" autoport="yes" listen="127.0.0.1">
<listen type="address" address="127.0.0.1"/>
</graphics>
<video>
<model type="cirrus" vram="16384" heads="1" primary="yes"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x02"
function="0x0"/>
</video>
<memballoon model="virtio">
<address type="pci" domain="0x0000" bus="0x00" slot="0x06"
function="0x0"/>
</memballoon>
<rng model="virtio">
<backend model="random">/dev/urandom</backend>
<address type="pci" domain="0x0000" bus="0x00" slot="0x07"
function="0x0"/>
</rng>
</devices>

<qemu:commandline>
<qemu:arg value="-fw_cfg"/>

<qemu:arg value="name=opt/org.flatcar-linux/config,file=/var/tmp/tftest-pool/tftest-mynode-ignition"/>
</qemu:commandline>
</domain>

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[Karl Nordstrom]

Kai,

# /usr/libexec/qemu-kvm --version

QEMU emulator version 1.5.3 (qemu-kvm-1.5.3-175.el7_9.4), Copyright (c) 2003-2008 Fabrice Bellard

I wonder if I need a different version of qemu-kvm to support -fw_cfg.

I see the -fw_cfg in the flatcar_production_qemu.sh you mention.

if [ -n "${IGNITION_CONFIG_FILE}" ]; then
    set -- -fw_cfg name=opt/org.flatcar-linux/config,file="${IGNITION_CONFIG_FILE}" "$@"
fi

I'll take a look at the teraform approach

[Kai Lüke]

Yes, I'm afraid your version is too old, according to
https://download.qemu.org/ it was released 2013, that's 8 years ago.

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[Karl Nordstrom]

I need a newer OS and maybe a newer server, too.

Thanks for your help

[Karl Nordstrom]

What is the minimum version of QEMU that is needed to install flatcar container linux?

I see this on Ubuntu 20.04.2 LTS

$ /usr/bin/qemu-system-x86_64 --version
QEMU emulator version 4.2.1 (Debian 1:4.2-3ubuntu6.16)
Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers

[Kai Lüke]

Looks good, the fw_cfg flag needs QEMU version >= 2.4, but of course
it's always good to have a version which still gets bug fixes.

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