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

Hello guys,

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

P.S. I already wrote to the #libvirt channel on IRC but nobody replied so I am
trying my luck here :)

Best regards

Petr Mensík

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

On Thu, Jun 16, 2016 at 11:17:16AM +0000, Mensik, Petr
wrote:
> Hello guys,
> 
> 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
> 
> P.S. I already wrote to the #libvirt channel on IRC but nobody replied so I
am trying my luck here :)
Most likely dhcpcd is not being copied into the appliance.

Try doing:

  echo dhcpcd > /usr/lib/x86_64-linux-gnu/guestfs/supermin.d/zzz-dhcp

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-builder quickly builds VMs from scratch
http://libguestfs.org/virt-builder.1.html

Hello Richard,

I tried what you have adviced (however zzz-dhcp should be replaced by something
else or is that right?) and still nothing changes. Btw dhcpcd should be running
on the background or is it fine to have just installed (I tried running script
with both options - same result unfortunately). Thanks again.

S pozdravem | Best regards

Petr Menšík

Senior Java Developer




________________________________________
From: Richard W.M. Jones <rjones@redhat.com>
Sent: Thursday, June 16, 2016 3:48 PM
To: Mensik, Petr
Cc: libguestfs@redhat.com
Subject: Re: [Libguestfs] libguestfs can't communicate over network while
creating VM

On Thu, Jun 16, 2016 at 11:17:16AM +0000, Mensik, Petr
wrote:
> Hello guys,
>
> 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
>
> P.S. I already wrote to the #libvirt channel on IRC but nobody replied so I
am trying my luck here :)
Most likely dhcpcd is not being copied into the appliance.

Try doing:

  echo dhcpcd > /usr/lib/x86_64-linux-gnu/guestfs/supermin.d/zzz-dhcp

Rich.

--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-builder quickly builds VMs from scratch
http://libguestfs.org/virt-builder.1.html

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