libvirt users - Jul 2017 - Re: Ubuntu 16.04 libvirt-guests.sh [6917] - running guests under URI address default: no running guests

Yeah, I know. Sorry for my demanding attitude.

Any hints how I could start debugging the problem?

2017-07-09 18:12 GMT+02:00 Dominik Psenner <dpsenner@gmail.com>:
> You can't expect anyone to step up happily to fix a problem you
> experience. If you're unhappy with the open source solution you have at
> least 4 options:
>
> 1. buy a license for red hat
> 2. get customer support from red hat
> 3. buy a license for vmware
> 4. work out why it doesn't work, give feedback to the community and may
> even work out a fix that you can give back to the community. with a bit of
> luck the overall open source product could evolve into something better.
>
> I feel sorry that I couldn't you help any further. Good luck!
>
> Cheers,
> Dominik
>
> 2017-07-09 0:38 GMT+02:00 Jędrek Domański
<jedrek.domanski@gmail.com>:
>
>> Dominik,
>>
>> What's the point of including a software to an OS that does not
work?
>>
>> 2017-07-08 18:34 GMT+02:00 Dominik Psenner <dpsenner@gmail.com>:
>>
>>> I just wanted to point out that you're only resolving the
symptom, not
>>> the actual cause. At the same time I'm afraid that I don't
know what the
>>> cause of your problems is. If you don't want to run virsh
guests you
>>> probably won't need the service, but then what's the point
of having
>>> libvirt-bin installed in the first place? :-)
>>>
>>> Cheers
>>>
>>> 2017-07-07 23:23 GMT+02:00 Jędrek Domański
<jedrek.domanski@gmail.com>:
>>>
>>>> Dominik,
>>>>
>>>> As far as I am concerned the command provided by Andrea
disables
>>>> libvirt-guests service at boot.
>>>>
>>>> jedrek@Home:~$ service libvirt-guests status
>>>> ● libvirt-guests.service - Suspend Active Libvirt Guests
>>>>    Loaded: loaded (/lib/systemd/system/libvirt-guests.service;
>>>> *disabled*; vendor preset: enabled)
>>>>    Active: inactive (dead)
>>>>      Docs: man:libvirtd(8)
>>>>            http://libvirt.org
>>>>
>>>> When you enable/disable a service *sysctemctl *creates a
symlink of a
>>>> service into the location on disk where systemd looks for
autostart files
>>>> (usually /etc/systemd/system/some_target.target.wants
>>>>
>>>> jedrek@Home:~$ ls /etc/systemd/system/ | grep libvirt*
>>>> libvirtd.service
>>>>
>>>> No libvirt-guests.service
>>>>
>>>> I know this is just a workaround but what's wrong with
this?
>>>>
>>>>
>>>>
>>>> 2017-07-07 19:13 GMT+02:00 Dominik Psenner
<dpsenner@gmail.com>:
>>>>
>>>>> Note that this disables the shutdown of libvirt guests when
the host
>>>>> shuts down.
>>>>>
>>>>> 2017-07-07 16:20 GMT+02:00 Jędrek Domański
<jedrek.domanski@gmail.com>
>>>>> :
>>>>>
>>>>>> Andrea,
>>>>>>
>>>>>> You are a genius!!! :D It's worked :)) Thank yo so
much!!! XD
>>>>>>
>>>>>> 2017-07-07 12:14 GMT+02:00 Andrea Bolognani
<abologna@redhat.com>:
>>>>>>
>>>>>>> On Fri, 2017-07-07 at 09:46 +0200, Jędrek Domański
wrote:
>>>>>>> > Hi Dominik,
>>>>>>> >
>>>>>>> > So what is going on on my computer with the
script
>>>>>>> libvirt-guests.sh?
>>>>>>> > Why is it hanging on it? How should I address
this problem?
>>>>>>>
>>>>>>> Not sure what the root cause of your problem is,
but you
>>>>>>> can use
>>>>>>>
>>>>>>>   # systemctl disable libvirt-guests
>>>>>>>
>>>>>>> to verify if the script is really what causes
shutdown
>>>>>>> to hang. It might very well be that it's merely
the last
>>>>>>> thing producing output before the actual issue
occurs.
>>>>>>>
>>>>>>> --
>>>>>>> Andrea Bolognani / Red Hat / Virtualization
>>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Dominik Psenner
>>>>>
>>>>
>>>>
>>>
>>>
>>> --
>>> Dominik Psenner
>>>
>>
>>
>
>
> --
> Dominik Psenner
>

I'm not familiar with the libvirt codebase, but the extension of
libvirt-guests.sh indicates that it is a shell script. Maybe you can modify
it to find the spot where it hangs?

2017-07-09 18:49 GMT+02:00 Jędrek Domański <jedrek.domanski@gmail.com>:
> Yeah, I know. Sorry for my demanding attitude.
>
> Any hints how I could start debugging the problem?
>
> 2017-07-09 18:12 GMT+02:00 Dominik Psenner <dpsenner@gmail.com>:
>
>> You can't expect anyone to step up happily to fix a problem you
>> experience. If you're unhappy with the open source solution you
have at
>> least 4 options:
>>
>> 1. buy a license for red hat
>> 2. get customer support from red hat
>> 3. buy a license for vmware
>> 4. work out why it doesn't work, give feedback to the community and
may
>> even work out a fix that you can give back to the community. with a bit
of
>> luck the overall open source product could evolve into something
better.
>>
>> I feel sorry that I couldn't you help any further. Good luck!
>>
>> Cheers,
>> Dominik
>>
>> 2017-07-09 0:38 GMT+02:00 Jędrek Domański
<jedrek.domanski@gmail.com>:
>>
>>> Dominik,
>>>
>>> What's the point of including a software to an OS that does not
work?
>>>
>>> 2017-07-08 18:34 GMT+02:00 Dominik Psenner
<dpsenner@gmail.com>:
>>>
>>>> I just wanted to point out that you're only resolving the
symptom, not
>>>> the actual cause. At the same time I'm afraid that I
don't know what the
>>>> cause of your problems is. If you don't want to run virsh
guests you
>>>> probably won't need the service, but then what's the
point of having
>>>> libvirt-bin installed in the first place? :-)
>>>>
>>>> Cheers
>>>>
>>>> 2017-07-07 23:23 GMT+02:00 Jędrek Domański
<jedrek.domanski@gmail.com>:
>>>>
>>>>> Dominik,
>>>>>
>>>>> As far as I am concerned the command provided by Andrea
disables
>>>>> libvirt-guests service at boot.
>>>>>
>>>>> jedrek@Home:~$ service libvirt-guests status
>>>>> ● libvirt-guests.service - Suspend Active Libvirt Guests
>>>>>    Loaded: loaded
(/lib/systemd/system/libvirt-guests.service;
>>>>> *disabled*; vendor preset: enabled)
>>>>>    Active: inactive (dead)
>>>>>      Docs: man:libvirtd(8)
>>>>>            http://libvirt.org
>>>>>
>>>>> When you enable/disable a service *sysctemctl *creates a
symlink of a
>>>>> service into the location on disk where systemd looks for
autostart files
>>>>> (usually /etc/systemd/system/some_target.target.wants
>>>>>
>>>>> jedrek@Home:~$ ls /etc/systemd/system/ | grep libvirt*
>>>>> libvirtd.service
>>>>>
>>>>> No libvirt-guests.service
>>>>>
>>>>> I know this is just a workaround but what's wrong with
this?
>>>>>
>>>>>
>>>>>
>>>>> 2017-07-07 19:13 GMT+02:00 Dominik Psenner
<dpsenner@gmail.com>:
>>>>>
>>>>>> Note that this disables the shutdown of libvirt guests
when the host
>>>>>> shuts down.
>>>>>>
>>>>>> 2017-07-07 16:20 GMT+02:00 Jędrek Domański
<jedrek.domanski@gmail.com
>>>>>> >:
>>>>>>
>>>>>>> Andrea,
>>>>>>>
>>>>>>> You are a genius!!! :D It's worked :)) Thank yo
so much!!! XD
>>>>>>>
>>>>>>> 2017-07-07 12:14 GMT+02:00 Andrea Bolognani
<abologna@redhat.com>:
>>>>>>>
>>>>>>>> On Fri, 2017-07-07 at 09:46 +0200, Jędrek
Domański wrote:
>>>>>>>> > Hi Dominik,
>>>>>>>> >
>>>>>>>> > So what is going on on my computer with
the script
>>>>>>>> libvirt-guests.sh?
>>>>>>>> > Why is it hanging on it? How should I
address this problem?
>>>>>>>>
>>>>>>>> Not sure what the root cause of your problem
is, but you
>>>>>>>> can use
>>>>>>>>
>>>>>>>>   # systemctl disable libvirt-guests
>>>>>>>>
>>>>>>>> to verify if the script is really what causes
shutdown
>>>>>>>> to hang. It might very well be that it's
merely the last
>>>>>>>> thing producing output before the actual issue
occurs.
>>>>>>>>
>>>>>>>> --
>>>>>>>> Andrea Bolognani / Red Hat / Virtualization
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> Dominik Psenner
>>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> Dominik Psenner
>>>>
>>>
>>>
>>
>>
>> --
>> Dominik Psenner
>>
>
>

-- 
Dominik Psenner

On Sun, 2017-07-09 at 19:14 +0200, Dominik Psenner
wrote:
> I'm not familiar with the libvirt codebase, but the
> extension of libvirt-guests.sh indicates that it is a
> shell script. Maybe you can modify it to find the spot
> where it hangs?
That's indeed the case. On Debian/Ubuntu system, the
script is installed as

  /usr/lib/libvirt/libvirt-guests.sh

and you can definitely try debugging it if you're
familiar with shell scripting.

I installed both libvirt-bin and qemu-kvm in an Ubuntu
16.04 guest in an attempt to reproduce the issue you're
having but I was unsuccessful, so I'm afraid I can't
really help you much further.

It would probably be a good idea to open a downstream
bug report with your vendor, as they might have an
easier time reproducing the issue.

It's worth noting that the libvirt version included in
Ubuntu 16.04 is a bit old (it was released a year and
a half ago), however the libvirt-guests script hasn't
changed very much in the meantime.

-- 
Andrea Bolognani / Red Hat / Virtualization