Libguestfs - Jun 2015 - Re: Issue with virt-builder on Ubuntu 14.04

Rich you're right, I forgot to run make. I added 'set -x' and reran
make
and then ran 'virt-builder -v -x' and it seems to hang at dhclient (see
attached log).

Shawn

On Tue, Jun 30, 2015 at 9:17 AM, Richard W.M. Jones <rjones@redhat.com>
wrote:
> On Tue, Jun 30, 2015 at 09:07:25AM -0600, Shawn Greig wrote:
> > - I tried forcing TCG and it gets to the same spot and stops.
>
> That excludes the possibility that it's a KVM or kernel bug
> (probably).
>
> > - running make quickcheck passes the tests (see attached)
> >
> > - I tried a different kernel (3.13.0-49-generic) and again it passes
the
> > quickcheck but virt-builder hangs.
>
> Add 'virt-builder -v -x' flags and see where it's hanging.
>
> > - I added 'set -x' to the top of the init script and I
don't see any
> > additional output (see attached)
>
> Somehow this didn't have any effect.  You probably didn't do a
'make'
> before the 'make quickcheck'.  It would still be useful to see the
> 'set -x' output to see if a particular command is hanging.
>
> Rich.
>
> --
> Richard Jones, Virtualization Group, Red Hat
> http://people.redhat.com/~rjones
> Read my programming and virtualization blog: http://rwmj.wordpress.com
> virt-df lists disk usage of guests without needing to install any
> software inside the virtual machine.  Supports Linux and Windows.
> http://people.redhat.com/~rjones/virt-df/
>

On Tue, Jun 30, 2015 at 09:41:45AM -0600, Shawn Greig
wrote:
> Rich you're right, I forgot to run make. I added 'set -x' and
reran make
> and then ran 'virt-builder -v -x' and it seems to hang at dhclient
(see
> attached log).
> + dhclient --version
> + dhclient
> /sbin/dhclient-script: line 31: /etc/fstab: No such file or directory
Yup, dhclient has been an ongoing problem.  Most recently:

  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=775514
  https://bugzilla.redhat.com/show_bug.cgi?id=1224795

It may help to run dhclient in the appliance under strace to see where
exactly it has stopped.  The appliance should contain strace (check
for it in appliance/packagelist.in and appliance/supermin.d/packages),
and if it does you can just edit the appliance/init script like this:

-     dhclient
+     strace dhclient

The other option is to use dhcpcd, but that also requires patching the
init script.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
Fedora Windows cross-compiler. Compile Windows programs, test, and
build Windows installers. Over 100 libraries supported.
http://fedoraproject.org/wiki/MinGW

Yeah, it's definitely an issue with dhclient. I patched the init script to
use dhcpcd instead and everything is working as expected now.

I've attached a log containing the strace of dhclient if that helps you or
someone else in the future.

Thanks for all your help Rich.

Shawn

On Tue, Jun 30, 2015 at 9:53 AM, Richard W.M. Jones <rjones@redhat.com>
wrote:
> On Tue, Jun 30, 2015 at 09:41:45AM -0600, Shawn Greig wrote:
> > Rich you're right, I forgot to run make. I added 'set -x'
and reran make
> > and then ran 'virt-builder -v -x' and it seems to hang at
dhclient (see
> > attached log).
>
> > + dhclient --version
> > + dhclient
> > /sbin/dhclient-script: line 31: /etc/fstab: No such file or directory
>
> Yup, dhclient has been an ongoing problem.  Most recently:
>
>   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=775514
>   https://bugzilla.redhat.com/show_bug.cgi?id=1224795
>
> It may help to run dhclient in the appliance under strace to see where
> exactly it has stopped.  The appliance should contain strace (check
> for it in appliance/packagelist.in and appliance/supermin.d/packages),
> and if it does you can just edit the appliance/init script like this:
>
> -     dhclient
> +     strace dhclient
>
> The other option is to use dhcpcd, but that also requires patching the
> init script.
>
> Rich.
>
> --
> Richard Jones, Virtualization Group, Red Hat
> http://people.redhat.com/~rjones
> Read my programming and virtualization blog: http://rwmj.wordpress.com
> Fedora Windows cross-compiler. Compile Windows programs, test, and
> build Windows installers. Over 100 libraries supported.
> http://fedoraproject.org/wiki/MinGW
>