libvirt users - Jun 2014 - Re: Fedora 19/20 new install :Unable to create vcpu cgroup

Hi,

Thanks Kashyap for your answer.

I am trying to give more data:

virt-install invokation:

# virt-install --name eff1 --disk /home/kvmimages/eff1.img  --cdrom 
/home/kvmimages/Fedora-20-x86_64-DVD.iso --memory 4096
WARNING  CDROM media does not print to the text console by default, so 
you likely will not see text install output. You might want to use 
--location.

Début d'installation...
ERROR    internal error: process exited while connecting to monitor: 
Failed to create chardev

Rpm: infos
# rpm -q virt-install libvirt-daemon-kvm qemu-system-x86
virt-install-1.0.1-3.fc20.noarch
libvirt-daemon-kvm-1.1.3.5-2.fc20.x86_64
qemu-system-x86-1.6.2-6.fc20.x86_64

I adapted your commands to my conf:

# qemu-img create -f qcow2 -o preallocation=metadata 
/home/kvmimages/f20vm 4G
Formatting '/home/kvmimages/f20vm', fmt=qcow2 size=4294967296 
encryption=off cluster_size=65536 preallocation='metadata' 
lazy_refcounts=off
# virt-install --name f20vm --disk /home/kvmimages/f20vm --cdrom 
/home/kvmimages/Fedora-20-x86_64-DVD.iso --memory 2048
WARNING  CDROM media does not print to the text console by default, so 
you likely will not see text install output. You might want to use 
--location.

Début d'installation...
ERROR    internal error: process exited while connecting to monitor: 
Failed to create chardev

L'installation du domaine ne semble pas s'être terminée avec succès.
Si c'est bon, vous pouvez démarrer le domaine en lançant :
  virsh --connect qemu:///system start f20vm
sinon, recommencez l'installation.

Always the same Failed to create chardev.

I do think it's a problem of permission as you said, but on which 
directory/files?

I am connected as root on my remote server, as simple user on my local 
computer. Both are running F20.

When I create/run a F20 VM on my local computer, it's OK. I have 
verified rpm versions, seem OK. I have rsynced /etc/libvirt dir from 
local computer to remote server.

It works on my local like on yours,but not on my remote. I need the 
remote to run VMs.

Thanks for your help.

Patrick



Le 15/06/2014 09:51, Kashyap Chamarthy a écrit :
> On Sun, Jun 15, 2014 at 09:01:29AM +0300, Patrick Chemla wrote:
>
> [. . .]
>
>> When trying to create a new VM using virt-manager I am getting :
>>
>> Impossible de terminer l'installation : « internal error: process
exited
>> while connecting to monitor: Failed to create chardev
>>   »
>>
>> Traceback (most recent call last):
>>    File "/usr/share/virt-manager/virtManager/asyncjob.py",
line 91, in
>> cb_wrapper
>>      callback(asyncjob, *args, **kwargs)
>>    File "/usr/share/virt-manager/virtManager/create.py", line
1787, in
>> do_install
>>      guest.start_install(meter=meter)
>>    File "/usr/share/virt-manager/virtinst/guest.py", line
403, in
>> start_install
>>      noboot)
>>    File "/usr/share/virt-manager/virtinst/guest.py", line
467, in
>> _create_guest
>>      dom = self.conn.createLinux(start_xml or final_xml, 0)
>>    File "/usr/lib64/python2.7/site-packages/libvirt.py", line
2897, in
>> createLinux
>>      if ret is None:raise libvirtError('virDomainCreateLinux()
failed',
>> conn=self)
>> libvirtError: internal error: process exited while connecting to
monitor:
>> Failed to create chardev
>>
>>
>> When tyring to create new VM with virt-install, I am getting:
>>
>> virt-install --name eff1 --disk /home/kvmimages/eff1.img  --cdrom
>> /home/kvmimages/Fedora-20-x86_64-DVD.iso --memory 4096B
>> ERROR    Error: --memory 4096B: invalid literal for int() with base 10:
>> '4096B'
> This is an invalid invocation.
>
>> [root@eff1 kvmimages]# virt-install --name eff1 --disk
>> /home/kvmimages/eff1.img  --cdrom
/home/kvmimages/Fedora-20-x86_64-DVD.iso
>> --memory 4096
>> WARNING  CDROM media does not print to the text console by default, so
you
>> likely will not see text install output. You might want to use
--location.
>>
>> Début d'installation...
>> ERROR    internal error: process exited while connecting to monitor:
Failed
>> to create chardev
> I just tested on my Fedora-20 machine, trying to boot a Fedora-19 VM it
> works for me:
>
>
>      $ qemu-img create -f qcow2 -o preallocation=metadata \
>        /export/vmimages/f19vm 4G
>
>      $ virt-install --name f19vm --disk /export/vmimages/f19vm \
>        --cdrom /export/Fedora-Live-Desktop-x86_64-19-1.iso \
>        --memory 2048
>      
>      Starting install...
>      Creating domain...
>      .
>      .
>      .
>
>   
> But, I should mention that I'm using virt packages from Rawhide:
>
>      $ rpm -q virt-install libvirt-daemon-kvm qemu-system-x86
>      virt-install-1.0.1-3.fc21.noarch
>      libvirt-daemon-kvm-1.2.6-1.fc20.x86_64
>      qemu-system-x86-2.0.0-1.fc21.x86_64
>
>> When trying to run with virt-manager a VM created on another F20
server:
>>
>> Erreur lors du démarrage du domaine: internal error: process exited
while
>> connecting to monitor: Failed to create chardev
>>
>>
>> Traceback (most recent call last):
>>    File "/usr/share/virt-manager/virtManager/asyncjob.py",
line 91, in
>> cb_wrapper
>>      callback(asyncjob, *args, **kwargs)
>>    File "/usr/share/virt-manager/virtManager/asyncjob.py",
line 127, in tmpcb
>>      callback(*args, **kwargs)
>>    File "/usr/share/virt-manager/virtManager/domain.py", line
1355, in
>> startup
>>      self._backend.create()
>>    File "/usr/lib64/python2.7/site-packages/libvirt.py", line
708, in create
>>      if ret == -1: raise libvirtError ('virDomainCreate()
failed', dom=self)
>> libvirtError: internal error: process exited while connecting to
monitor:
>> Failed to create chardev
>>
>>
>> What is this chardev error?
> Ensure you have correct permissions to allow QEMU to access disk images
> in your $HOME directory:
>
>      $ chmod o+rx $HOME
>
> I guess that should resolve it.
>

On Sun, Jun 15, 2014 at 10:27:12AM +0300, Patrick Chemla wrote:

[. . .]
> I adapted your commands to my conf:
> 
> # qemu-img create -f qcow2 -o preallocation=metadata /home/kvmimages/f20vm
> 4G
> Formatting '/home/kvmimages/f20vm', fmt=qcow2 size=4294967296
encryption=off
> cluster_size=65536 preallocation='metadata' lazy_refcounts=off
> # virt-install --name f20vm --disk /home/kvmimages/f20vm --cdrom
> /home/kvmimages/Fedora-20-x86_64-DVD.iso --memory 2048
> WARNING  CDROM media does not print to the text console by default, so you
> likely will not see text install output. You might want to use --location.
> 
> Début d'installation...
> ERROR    internal error: process exited while connecting to monitor: Failed
> to create chardev
> 
> L'installation du domaine ne semble pas s'être terminée avec
succès.
> Si c'est bon, vous pouvez démarrer le domaine en lançant :
>  virsh --connect qemu:///system start f20vm
> sinon, recommencez l'installation.
> 
> Always the same Failed to create chardev.
> 
> I do think it's a problem of permission as you said, but on which
> directory/files?
Wherever your disk image is located (/home/kvmimages) QEMU should be
able to access it (executable bit for 'others'). For instance, I have
these permissions for my home directory where I store VM images:

    $ ls -lash / | grep home
    4.0K drwxr-xr-x.   7 root    root     4.0K Aug  7  2013 home

Permissions on the specific directory where I store VM images
(/home/kashyap/vmimages):

    $ ls -lash /home/kashyap/ | grep vmimages
    4.0K drwxrwxr-x.   2 kashyap kashyap 4.0K Jun 14 21:50 vmimages

 
> When I create/run a F20 VM on my local computer, it's OK. I have
> verified rpm versions, seem OK. I have rsynced /etc/libvirt dir from
> local computer to remote server.
> 
> It works on my local like on yours,but not on my remote. I need the
> remote to run VMs.
If I'm parsing you correctly, you've SSHed into the remote machine and
running virt-install. Like I said, if QEMU can access your home
directory (as I noted above), where you're storing disk images, you
shouldn't have any issues.

 
-- 
/kashyap

Thanks for your interest.

Here are the dir/files permissions for the kvmimages dir:

# ls -ld /home /home/kvmimages /home/kvmimages/*
drwxr-xr-x. 4 root root        4096 14 juin  23:05 /home
drwxrwxrwx  2 root root        4096 15 juin  09:19 /home/kvmimages
-rw-rw-rwx  1 root root 12884901888 14 juin  23:07 /home/kvmimages/eff1.img
-rw-rw-rwx  1 root root 12884901888 14 juin  23:11 /home/kvmimages/eff2.img
-rw----r-x  1 root root 12887130112 11 juin  15:51 
/home/kvmimages/effi.qcow2
-rw-r--r--  1 root root  4295884800 15 juin  09:19 /home/kvmimages/f20vm
-rw-r--r-x  1 qemu qemu  4603248640 12 déc.   2013 
/home/kvmimages/Fedora-20-x86_64-DVD.iso

As you can see, all are executabled by others.

Should I chown to qemu? or something else?

Patrick
Le 15/06/2014 11:32, Kashyap Chamarthy a écrit :
> On Sun, Jun 15, 2014 at 10:27:12AM +0300, Patrick Chemla wrote:
>
> [. . .]
>
>> I adapted your commands to my conf:
>>
>> # qemu-img create -f qcow2 -o preallocation=metadata
/home/kvmimages/f20vm
>> 4G
>> Formatting '/home/kvmimages/f20vm', fmt=qcow2 size=4294967296
encryption=off
>> cluster_size=65536 preallocation='metadata' lazy_refcounts=off
>> # virt-install --name f20vm --disk /home/kvmimages/f20vm --cdrom
>> /home/kvmimages/Fedora-20-x86_64-DVD.iso --memory 2048
>> WARNING  CDROM media does not print to the text console by default, so
you
>> likely will not see text install output. You might want to use
--location.
>>
>> Début d'installation...
>> ERROR    internal error: process exited while connecting to monitor:
Failed
>> to create chardev
>>
>> L'installation du domaine ne semble pas s'être terminée avec
succès.
>> Si c'est bon, vous pouvez démarrer le domaine en lançant :
>>   virsh --connect qemu:///system start f20vm
>> sinon, recommencez l'installation.
>>
>> Always the same Failed to create chardev.
>>
>> I do think it's a problem of permission as you said, but on which
>> directory/files?
> Wherever your disk image is located (/home/kvmimages) QEMU should be
> able to access it (executable bit for 'others'). For instance, I
have
> these permissions for my home directory where I store VM images:
>
>      $ ls -lash / | grep home
>      4.0K drwxr-xr-x.   7 root    root     4.0K Aug  7  2013 home
>
> Permissions on the specific directory where I store VM images
> (/home/kashyap/vmimages):
>
>      $ ls -lash /home/kashyap/ | grep vmimages
>      4.0K drwxrwxr-x.   2 kashyap kashyap 4.0K Jun 14 21:50 vmimages
>
>   
>> When I create/run a F20 VM on my local computer, it's OK. I have
>> verified rpm versions, seem OK. I have rsynced /etc/libvirt dir from
>> local computer to remote server.
>>
>> It works on my local like on yours,but not on my remote. I need the
>> remote to run VMs.
> If I'm parsing you correctly, you've SSHed into the remote machine
and
> running virt-install. Like I said, if QEMU can access your home
> directory (as I noted above), where you're storing disk images, you
> shouldn't have any issues.
>
>