Libguestfs - Jun 2016 - Re: libguestfs can't communicate over network while creating VM

Hello Pino,

I tried installing the package and running the command, however nothing has
changed :-/ This package should be installed as an addition to the dhcpcd5 or is
a replacement? Thanks

Best regards,

Petr




________________________________________
From: Pino Toscano <ptoscano@redhat.com>
Sent: Thursday, June 16, 2016 1:45 PM
To: libguestfs@redhat.com; Mensik, Petr
Subject: Re: [Libguestfs] libguestfs can't communicate over network while
creating VM

Hi,

On Thursday 16 June 2016 11:17:16 Mensik, Petr wrote:
> we use libguests for dynamic creation of our VM and we do various
> modifications of those VMs in the process. One with I am struggling
> with is to signing keys of our custom repository -  "
> vm.sh("wget -O - " + key_address + " | apt-key add
-")" where "vm" is
> a GuestFS object. So I have set "vm.set_network(True)" and I have
> installed "dhcpcd5" package (that's whats on Debian Jessie)
on both
> Host OS with KVM running and VM template (because we always copy
> Debian template we have in order to create new VM). However according
> to the log libvirt is still complaining that dhcpcd is missing (line
> 371 in the log). I ran dhcpcd command on both machines and I've even
> restarted networking service - unfortunately nothing helps. So I'd
> like to ask you for help or at least any hints. Thanks a lot.
>
> http://pastebin.com/d6zZG1BK
This is not really a libvirt issue, but a libguestfs one.

When setting up the network, libguestfs tries to use first dhclient if
available, then dhcpcd otherwise.
I see that libguestfs0 currently in Stretch has a dependency on
isc-dhcp-client, but it looks like the version in Jessie does not.
Do you have isc-dhcp-client installed on the machine where you run the
Python script? If not, install it and then run `libguestfs-test-tool`
to update the libguestfs appliance (it will be done anyway later, but
this way your script doesn't take more than needed).
Once you have done that, does the network work?

--
Pino Toscano

Hi,

On Thursday 16 June 2016 15:12:39 Mensik, Petr wrote:
> I tried installing the package and running the command, however
> nothing has changed :-/ This package should be installed as an
> addition to the dhcpcd5 or is a replacement?
Curiously enough, another user asked about this on our IRC channel
(#libguestfs on freenode) a couple of hours ago, and what came out is
that there is a bug in the Debian packaging, where the lack of a build
dependency made the appliance not use the right dhcp package.

To workaround locally, on the host where you are running the libguestfs
commands you can do:
1) install isc-dhcp-client
2) as root, `echo isc-dhcp-client >
/usr/lib/x86_64-linux-gnu/guestfs/supermin.d/zzz-dhcp`
3) as the user who runs your Python script, run libguestfs-test-tool
   to update the appliance -- you should see the line:
supermin: build: visiting /usr/lib/x86_64-linux-gnu/guestfs/supermin.d/zzz-dhcp
type uncompressed packages
in its output -- meaning that file was picked correctly (and thus
isc-dhcp-client hopefully copied)
4) now the network should work

There is a Debian bug about it: https://bugs.debian.org/775514 -- fixed
only in Stretch though.  Just left a comment there, should be an easy
fix for Jessie.

Thanks,
-- 
Pino Toscano

Hello Pino,

I am still getting the same error however from libguestfs log (when creating VM)
seems that DHCP has been found - no 'DHCP can't be found' or
whatever error it was. So there is some progress but the issue persists :-/

This is what I have done

apt-get purge dhcpcd5*
apt-get install isc-dhcp-client
echo isc-dhcp-client > /usr/lib/x86_64-linux-gnu/guestfs/supermin.d/zzz-dhcp
libguestfs-test-tool (and the message was indeed in the log)

So I am wondering what could be the issue. I am enclosing libguestfs log from VM
creation http://pastebin.com/A3We5f1F . Thanks a lot for your help

Best regards

Petr Menšík


________________________________________
From: Pino Toscano <ptoscano@redhat.com>
Sent: Thursday, June 16, 2016 6:03 PM
To: libguestfs@redhat.com; Mensik, Petr
Subject: Re: [Libguestfs] libguestfs can't communicate over network while
creating VM

Hi,

On Thursday 16 June 2016 15:12:39 Mensik, Petr wrote:
> I tried installing the package and running the command, however
> nothing has changed :-/ This package should be installed as an
> addition to the dhcpcd5 or is a replacement?
Curiously enough, another user asked about this on our IRC channel
(#libguestfs on freenode) a couple of hours ago, and what came out is
that there is a bug in the Debian packaging, where the lack of a build
dependency made the appliance not use the right dhcp package.

To workaround locally, on the host where you are running the libguestfs
commands you can do:
1) install isc-dhcp-client
2) as root, `echo isc-dhcp-client >
/usr/lib/x86_64-linux-gnu/guestfs/supermin.d/zzz-dhcp`
3) as the user who runs your Python script, run libguestfs-test-tool
   to update the appliance -- you should see the line:
supermin: build: visiting /usr/lib/x86_64-linux-gnu/guestfs/supermin.d/zzz-dhcp
type uncompressed packages
in its output -- meaning that file was picked correctly (and thus
isc-dhcp-client hopefully copied)
4) now the network should work

There is a Debian bug about it: https://bugs.debian.org/775514 -- fixed
only in Stretch though.  Just left a comment there, should be an easy
fix for Jessie.

Thanks,
--
Pino Toscano