* "guix system vm" to libvirt XML domain
@ 2019-01-24 18:18 Giovanni Biscuolo
2019-01-24 19:04 ` Giovanni Biscuolo
0 siblings, 1 reply; 4+ messages in thread
From: Giovanni Biscuolo @ 2019-01-24 18:18 UTC (permalink / raw)
To: help-guix
[-- Attachment #1.1: Type: text/plain, Size: 5821 bytes --]
Hi!
I'm using guix on a foreign distro (Debian 9) and I'm already using
libvirtd to manage some KVM guests; I'd like to also manage "guix
system vm" generated ones using libvirt
it would be great to be able to automatically manage the (re)definition
of VMs (and containers?) on - possibly remote - libvirtd servers using a
distributedVM.scm config :-): WDYT?
anyway... as for now it must be "manually" managed and this is
what I'm doing: it fails at the end, what am I doing wrong?
is there a better way to do it?
1. I save the "command line" from the script generated by "guix system
vm" (except the last "@") calling this "container.minimal.args.orig
--8<---------------cut here---------------start------------->8---
/gnu/store/4pnx934k40wni57r5swj2kr29l1j549f-qemu-3.1.0/bin/qemu-system-x86_64 -kernel /gnu/store/y5aiijqiqna1y8ypn6c0jp367813xxnc-linux-libre-4.20.3/bzImage -initrd /gnu/store/9xgqs9zf51i9binqjl5hgl8gl7ql40hc-system/initrd -append "--root=/dev/vda1 --system=/gnu/store/9xgqs9zf51i9binqjl5hgl8gl7ql40hc-system --load=/gnu/store/9xgqs9zf51i9binqjl5hgl8gl7ql40hc-system/boot" -enable-kvm -no-reboot -net nic,model=virtio -object rng-random,filename=/dev/urandom,id=guixsd-vm-rng -device virtio-rng-pci,rng=guixsd-vm-rng -virtfs local,path="/gnu/store",security_model=none,mount_tag="TAGjoptajej2oynju6yvboauz7pl6uj" -vga std -drive file=/gnu/store/4mz1qqv7h5g5885q1aq0izlmy01knf1g-qemu-image,if=virtio,cache=writeback,werror=report,readonly -m 256
--8<---------------cut here---------------end--------------->8---
2. try to convert it to libvirt XML domain definition
--8<---------------cut here---------------start------------->8---
$ virsh --connect qemu:///system domxml-from-native qemu-argv container-minimal.args.orig
error: internal error: malformed keyword arguments in 'file=/gnu/store/4mz1qqv7h5g5885q1aq0izlmy01knf1g-qemu-image,if=virtio,cache=writeback,werror=report,readonly'
--8<---------------cut here---------------end--------------->8---
3. remove the "readonly" keyword from the last "-drive" arg, calling this
"container.minimal.args" (that *must* be then manually added to the XML
definition)
--8<---------------cut here---------------start------------->8---
/gnu/store/4pnx934k40wni57r5swj2kr29l1j549f-qemu-3.1.0/bin/qemu-system-x86_64 -kernel /gnu/store/y5aiijqiqna1y8ypn6c0jp367813xxnc-linux-libre-4.20.3/bzImage -initrd /gnu/store/9xgqs9zf51i9binqjl5hgl8gl7ql40hc-system/initrd -append "--root=/dev/vda1 --system=/gnu/store/9xgqs9zf51i9binqjl5hgl8gl7ql40hc-system --load=/gnu/store/9xgqs9zf51i9binqjl5hgl8gl7ql40hc-system/boot" -enable-kvm -no-reboot -net nic,model=virtio -object rng-random,filename=/dev/urandom,id=guixsd-vm-rng -device virtio-rng-pci,rng=guixsd-vm-rng -virtfs local,path="/gnu/store",security_model=none,mount_tag="TAGjoptajej2oynju6yvboauz7pl6uj" -vga std -drive file=/gnu/store/4mz1qqv7h5g5885q1aq0izlmy01knf1g-qemu-image,if=virtio,cache=writeback,werror=report -m 256
--8<---------------cut here---------------end--------------->8---
4. converting the file above
--8<---------------cut here---------------start------------->8---
$ virsh --connect qemu:///system domxml-from-native qemu-argv container-minimal.args
<domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
<name>unnamed</name>
<uuid>894f668e-32a5-4331-9d30-8604b89ae359</uuid>
<memory unit='KiB'>262144</memory>
<currentMemory unit='KiB'>262144</currentMemory>
<vcpu placement='static'>1</vcpu>
<os>
<type arch='x86_64' machine='pc-i440fx-2.8'>hvm</type>
<kernel>/gnu/store/y5aiijqiqna1y8ypn6c0jp367813xxnc-linux-libre-4.20.3/bzImage</kernel>
<initrd>/gnu/store/9xgqs9zf51i9binqjl5hgl8gl7ql40hc-system/initrd</initrd>
<cmdline>--root=/dev/vda1 --system=/gnu/store/9xgqs9zf51i9binqjl5hgl8gl7ql40hc-system --load=/gnu/store/9xgqs9zf51i9binqjl5hgl8gl7ql40hc-system/boot</cmdline>
</os>
<features>
<acpi/>
</features>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>destroy</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/gnu/store/4pnx934k40wni57r5swj2kr29l1j549f-qemu-3.1.0/bin/qemu-system-x86_64</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='raw' cache='writeback' error_policy='report'/>
<source file='/gnu/store/4mz1qqv7h5g5885q1aq0izlmy01knf1g-qemu-image'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' 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'/>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<graphics type='sdl'/>
<video>
<model type='vga' vram='16384' heads='1' primary='yes'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</video>
<memballoon model='none'/>
</devices>
<qemu:commandline>
<qemu:arg value='-object'/>
<qemu:arg value='rng-random,filename=/dev/urandom,id=guixsd-vm-rng'/>
<qemu:arg value='-device'/>
<qemu:arg value='virtio-rng-pci,rng=guixsd-vm-rng'/>
<qemu:arg value='-virtfs'/>
<qemu:arg value='local,path="/gnu/store",security_model=none,mount_tag="TAGjoptajej2oynju6yvboauz7pl6uj"'/>
</qemu:commandline>
</domain>
--8<---------------cut here---------------end--------------->8---
5. unfortunately some command line args are not automatically converted,
so I have to "manually" convert it [1]... also adapting some parametrs
to my needs (e.g. name, memory, network, graphics); saving as
container-minimal-fixed.xml
[-- Attachment #1.2: signature.asc --]
[-- Type: application/pgp-signature, Size: 832 bytes --]
[-- Attachment #2: container-minimal-fixed.xml --]
[-- Type: application/xml, Size: 2363 bytes --]
<domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
<name>container-minimal</name>
<uuid>ecfe2538-5315-44aa-bba5-8fe4d86d5397</uuid>
<memory unit='GB'>2</memory>
<currentMemory unit='GB'>2</currentMemory>
<vcpu placement='static'>2</vcpu>
<os>
<type arch='x86_64' machine='pc-i440fx-2.8'>hvm</type>
<kernel>/gnu/store/y5aiijqiqna1y8ypn6c0jp367813xxnc-linux-libre-4.20.3/bzImage</kernel>
<initrd>/gnu/store/9xgqs9zf51i9binqjl5hgl8gl7ql40hc-system/initrd</initrd>
<cmdline>--root=/dev/vda1 --system=/gnu/store/9xgqs9zf51i9binqjl5hgl8gl7ql40hc-system --load=/gnu/store/9xgqs9zf51i9binqjl5hgl8gl7ql40hc-system/boot</cmdline>
</os>
<features>
<acpi/>
</features>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>destroy</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/gnu/store/4pnx934k40wni57r5swj2kr29l1j549f-qemu-3.1.0/bin/qemu-system-x86_64</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='raw' cache='writeback' error_policy='report'/>
<source file='/gnu/store/4mz1qqv7h5g5885q1aq0izlmy01knf1g-qemu-image'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
<readonly/>
</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'/>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<graphics type='spice' port='3003' autoport='no' listen='127.0.0.1'>
<listen type='address' address='127.0.0.1'/>
</graphics>
<video>
<model type='qxl' ram='65536' vram='16384' vgamem='16384' heads='1' primary='yes'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</video>
<memballoon model='none'/>
<rng model='virtio'>
<backend model='random'>/dev/urandom</backend>
</rng>
<interface type='network'>
<mac address='52:54:00:ae:72:b9'/>
<source network='gblabs'/>
<model type='rtl8139'/>
</interface>
</devices>
<filesystem type='mount' accessmode='none'>
<source dir='/gnu/store'/>
<target dir='TAGjoptajej2oynju6yvboauz7pl6uj'/>
</filesystem>
</domain>
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6. register the domain definition in libvirtd
--8<---------------cut here---------------start------------->8---
$ virsh --connect qemu:///system define container-minimal-fixed.xml
Domain container-minimal defined from container-minimal-fixed.xml
--8<---------------cut here---------------end--------------->8---
7. start the VM, connect via SPICE and see the VM does not boot due to
an error in procedure mount, falling back to the guile REPL; the backtrace
is:
--8<---------------cut here---------------start------------->8---
In gnu/build/linux-boot.scm:
516:13 2 (_)
367:8 1 (mount-root-file-system "/dev/vda1" "ext4" # _)
In unknown file:
0 (mount "/dev/vda1" "/real-root" "ext4" 1 #<undefined>)
--8<---------------cut here---------------end--------------->8---
any hint please?
Thanks!
Giovanni
[1] using this docs as ref:
https://wiki.qemu.org/Documentation/9psetup#Starting_the_Guest_using_libvirt
https://libvirt.org/formatdomain.html#elementsRng
--
Giovanni Biscuolo
Xelera IT Infrastructures
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: "guix system vm" to libvirt XML domain
2019-01-24 18:18 "guix system vm" to libvirt XML domain Giovanni Biscuolo
@ 2019-01-24 19:04 ` Giovanni Biscuolo
2019-01-24 20:01 ` Gábor Boskovits
0 siblings, 1 reply; 4+ messages in thread
From: Giovanni Biscuolo @ 2019-01-24 19:04 UTC (permalink / raw)
To: help-guix
[-- Attachment #1: Type: text/plain, Size: 1428 bytes --]
Hi,
reply to myself:
Giovanni Biscuolo <g@xelera.eu> writes:
[...]
> 7. start the VM, connect via SPICE and see the VM does not boot due to
> an error in procedure mount, falling back to the guile REPL; the backtrace
> is:
>
> --8<---------------cut here---------------start------------->8---
> In gnu/build/linux-boot.scm:
> 516:13 2 (_)
> 367:8 1 (mount-root-file-system "/dev/vda1" "ext4" # _)
> In unknown file:
> 0 (mount "/dev/vda1" "/real-root" "ext4" 1 #<undefined>)
> --8<---------------cut here---------------end--------------->8---
OK I solved this, it was "virsh domxml-from-native" that missed to detect
the correct disk type of the vda disk, so I changed this part of the XML
domain definition:
--8<---------------cut here---------------start------------->8---
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='writeback' error_policy='report'/>
<source file='/gnu/store/4mz1qqv7h5g5885q1aq0izlmy01knf1g-qemu-image'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</disk>
--8<---------------cut here---------------end--------------->8---
type='raw' changed to type='qcow2'
but now I've a problem with the /gnu/store mount in guest
"9pnet_virtio: no channels available for device TAGjoptajej2oynju6yvboauz7pl6uj"
...still missimg someting
any hint please?
Thanks!
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--
Giovanni Biscuolo
Xelera IT Infrastructures
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: "guix system vm" to libvirt XML domain
2019-01-24 19:04 ` Giovanni Biscuolo
@ 2019-01-24 20:01 ` Gábor Boskovits
2019-01-25 11:21 ` Giovanni Biscuolo
0 siblings, 1 reply; 4+ messages in thread
From: Gábor Boskovits @ 2019-01-24 20:01 UTC (permalink / raw)
To: Giovanni Biscuolo; +Cc: help-guix
Hello,
Giovanni Biscuolo <g@xelera.eu> ezt írta (időpont: 2019. jan. 24., Cs, 20:05):
>
> Hi,
>
> reply to myself:
>
> Giovanni Biscuolo <g@xelera.eu> writes:
>
> [...]
>
> > 7. start the VM, connect via SPICE and see the VM does not boot due to
> > an error in procedure mount, falling back to the guile REPL; the backtrace
> > is:
> >
> > --8<---------------cut here---------------start------------->8---
> > In gnu/build/linux-boot.scm:
> > 516:13 2 (_)
> > 367:8 1 (mount-root-file-system "/dev/vda1" "ext4" # _)
> > In unknown file:
> > 0 (mount "/dev/vda1" "/real-root" "ext4" 1 #<undefined>)
> > --8<---------------cut here---------------end--------------->8---
>
> OK I solved this, it was "virsh domxml-from-native" that missed to detect
> the correct disk type of the vda disk, so I changed this part of the XML
> domain definition:
>
> --8<---------------cut here---------------start------------->8---
> <disk type='file' device='disk'>
> <driver name='qemu' type='qcow2' cache='writeback' error_policy='report'/>
> <source file='/gnu/store/4mz1qqv7h5g5885q1aq0izlmy01knf1g-qemu-image'/>
> <target dev='vda' bus='virtio'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
> </disk>
> --8<---------------cut here---------------end--------------->8---
>
> type='raw' changed to type='qcow2'
>
> but now I've a problem with the /gnu/store mount in guest
>
> "9pnet_virtio: no channels available for device TAGjoptajej2oynju6yvboauz7pl6uj"
>
> ...still missimg someting
>
> any hint please?
>
I have seen this once, and the virtio-pci kernel module was missing.
When you run it from guix system
vm, then what bus you have the drive on? It might be easier to
replicate that version, I don't know if it
is virtio, but I guess not.
> Thanks!
>
> --
> Giovanni Biscuolo
>
> Xelera IT Infrastructures
Best regards,
g_bor
p.s.: A nice interface to libvirt would be a very good idea.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: "guix system vm" to libvirt XML domain
2019-01-24 20:01 ` Gábor Boskovits
@ 2019-01-25 11:21 ` Giovanni Biscuolo
0 siblings, 0 replies; 4+ messages in thread
From: Giovanni Biscuolo @ 2019-01-25 11:21 UTC (permalink / raw)
To: Gábor Boskovits; +Cc: help-guix
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Hi Gabor,
thanks for your interest
Gábor Boskovits <boskovits@gmail.com> writes:
[...]
>> but now I've a problem with the /gnu/store mount in guest
>>
>> "9pnet_virtio: no channels available for device TAGjoptajej2oynju6yvboauz7pl6uj"
>>
>> ...still missimg someting
>>
>> any hint please?
>>
>
> I have seen this once, and the virtio-pci kernel module was missing.
I had excluded this since starting the VM using the "guix system vm"
generated script succeeds, I expect the libvirt defined one to run alike
long story short: my domain XML definition was *wrong*, I defined the
/gnu/store filesystem
--8<---------------cut here---------------start------------->8---
<filesystem type='mount' accessmode='passthrough'>
<driver type='path' wrpolicy='immediate'/>
<source dir='/gnu/store'/>
<target dir='TAGjoptajej2oynju6yvboauz7pl6uj'/>
</filesystem>
--8<---------------cut here---------------end--------------->8---
in the wrong part of the XML tree, namely outside
--8<---------------cut here---------------start------------->8---
<devices>
[...]
</devices>
--8<---------------cut here---------------end--------------->8---
and virsh ignored it (no error, no warning) when I used that XML to
define the VM via "virsh ... define cointainer-minimal.xml" [1]
hint: always use virsh-xml-validate to check the file, since virsh does
not validate it before registering the definition (AFAIK "virsh define"
also hasn't a proper flag to do it)
this is the correct XML domain definition, now working:
[-- Attachment #2: container-minimal-fixed.xml --]
[-- Type: application/xml, Size: 2431 bytes --]
<domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
<name>container-minimal</name>
<uuid>ecfe2538-5315-44aa-bba5-8fe4d86d5397</uuid>
<memory unit='GB'>2</memory>
<currentMemory unit='GB'>2</currentMemory>
<vcpu placement='static'>2</vcpu>
<os>
<type arch='x86_64' machine='pc-i440fx-2.8'>hvm</type>
<kernel>/gnu/store/y5aiijqiqna1y8ypn6c0jp367813xxnc-linux-libre-4.20.3/bzImage</kernel>
<initrd>/gnu/store/9xgqs9zf51i9binqjl5hgl8gl7ql40hc-system/initrd</initrd>
<cmdline>--root=/dev/vda1 --system=/gnu/store/9xgqs9zf51i9binqjl5hgl8gl7ql40hc-system --load=/gnu/store/9xgqs9zf51i9binqjl5hgl8gl7ql40hc-system/boot</cmdline>
</os>
<features>
<acpi/>
</features>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>destroy</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/gnu/store/4pnx934k40wni57r5swj2kr29l1j549f-qemu-3.1.0/bin/qemu-system-x86_64</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='writeback' error_policy='report'/>
<source file='/gnu/store/4mz1qqv7h5g5885q1aq0izlmy01knf1g-qemu-image'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
<readonly/>
</disk>
<filesystem type='mount' accessmode='passthrough'>
<driver type='path' wrpolicy='immediate'/>
<source dir='/gnu/store'/>
<target dir='TAGjoptajej2oynju6yvboauz7pl6uj'/>
</filesystem>
<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'/>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<graphics type='spice' port='3003' autoport='no' listen='127.0.0.1'>
<listen type='address' address='127.0.0.1'/>
</graphics>
<video>
<model type='qxl' ram='65536' vram='16384' vgamem='16384' heads='1' primary='yes'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</video>
<memballoon model='none'/>
<rng model='virtio'>
<backend model='random'>/dev/urandom</backend>
</rng>
<interface type='network'>
<mac address='52:54:00:ae:72:b9'/>
<source network='gblabs'/>
<model type='rtl8139'/>
</interface>
</devices>
</domain>
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hope this will help others!
happy hacking!
Giovanni
[...]
[1] /var/log/libvirt/qemu/container-minimal.log was helpful since the
command line used to start the VM lacked
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--
Giovanni Biscuolo
Xelera IT Infrastructures
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2019-01-24 18:18 "guix system vm" to libvirt XML domain Giovanni Biscuolo
2019-01-24 19:04 ` Giovanni Biscuolo
2019-01-24 20:01 ` Gábor Boskovits
2019-01-25 11:21 ` Giovanni Biscuolo
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