Libguestfs - Jul 2016 - Re: Help: Can I access network inside libguestfs?

Thanks Pino for quick response.
Actually I use the libguestfs APIs in C++ program. Following your idea, I
think I should try guestfs_set_network for this.
Please correct me if I have any misunderstanding.

Thanks,
Allen

2016-07-12 16:38 GMT+08:00 Pino Toscano <ptoscano@redhat.com>:
> Hi,
>
> On Tuesday, 12 July 2016 16:30:17 CEST Baochuan Wu wrote:
> > I mounted virtual disks of CentOS 6.4 using libguestfs. After
mounting, I
> > tried to install some software using yum command. The yum command
failed
> > because of DNS failure, I think I correctly configured
> DNS(/etc/resolv.conf
> > in the CentOS virtual disk).
> >
> > I wonder is it possible to access network inside libguestfs?
>
> By "mounting", do you mean with guestfish?  If so, it has a
--network
> parameter to enable networking for the guest.  Other tools have similar
> options to enable and disable the networking, and few of them
> (virt-customize, virt-builder, and virt-dib) have networking enabled
> by default.
>
> --
> Pino Toscano

On Tue, Jul 12, 2016 at 04:48:06PM +0800, Baochuan Wu
wrote:
> Thanks Pino for quick response.
> Actually I use the libguestfs APIs in C++ program. Following your idea, I
> think I should try guestfs_set_network for this.
Yes this is correct.  Calling:

  guestfs_set_network (g, 1);

should enable the network inside the appliance.

For further tips on using yum, have a look at how virt-customize
works.  In particular you must use "yum -y install ..." to avoid any
unwanted interactivity.

https://github.com/libguestfs/libguestfs/blob/master/customize/customize_run.ml#L29-L189

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-p2v converts physical machines to virtual machines.  Boot with a
live CD or over the network (PXE) and turn machines into KVM guests.
http://libguestfs.org/virt-v2v

On Tue, Jul 12, 2016 at 11:22:24AM +0100, Richard W.M. Jones
wrote:
> On Tue, Jul 12, 2016 at 04:48:06PM +0800, Baochuan Wu wrote:
> > Thanks Pino for quick response.
> > Actually I use the libguestfs APIs in C++ program. Following your
idea, I
> > think I should try guestfs_set_network for this.
> 
> Yes this is correct.  Calling:
> 
>   guestfs_set_network (g, 1);
> 
> should enable the network inside the appliance.
... And I should say you must call this _before_ you call
guestfs_launch.

Rich.
> For further tips on using yum, have a look at how virt-customize
> works.  In particular you must use "yum -y install ..." to avoid
any
> unwanted interactivity.
> 
>
https://github.com/libguestfs/libguestfs/blob/master/customize/customize_run.ml#L29-L189
> 
> Rich.
> 
> -- 
> Richard Jones, Virtualization Group, Red Hat
http://people.redhat.com/~rjones
> Read my programming and virtualization blog: http://rwmj.wordpress.com
> virt-p2v converts physical machines to virtual machines.  Boot with a
> live CD or over the network (PXE) and turn machines into KVM guests.
> http://libguestfs.org/virt-v2v
> 
> _______________________________________________
> Libguestfs mailing list
> Libguestfs@redhat.com
> https://www.redhat.com/mailman/listinfo/libguestfs
-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-top is 'top' for virtual machines.  Tiny program with many
powerful monitoring features, net stats, disk stats, logging, etc.
http://people.redhat.com/~rjones/virt-top

[Let's keep the replies on the mailing list please]

On Wed, Jul 13, 2016 at 11:04:13AM +0800, Baochuan Wu
wrote:
> Thanks Richard.
> I tried guestfs_set_network, and I think I can successfully use yum -y to
> install software. It is a little slow.
Most of the time is taken running yum and downloading packages ...
> My program operates CentOS 6.4 VM virtual disks on CentOS 7, I installed
> libguestfs into the CentOS 6.4. After installing, I reboot CentOS 6.4 but I
> cannot log into it anymore.
You will need to relabel the filesystem after installing packages, see:

 
https://github.com/libguestfs/libguestfs/blob/master/customize/customize_run.ml#L415-L430

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

Thanks Richard. I followed your guide and it works for me.

Thanks,
Allen

2016-07-13 17:04 GMT+08:00 Richard W.M. Jones <rjones@redhat.com>:
> [Let's keep the replies on the mailing list please]
>
> On Wed, Jul 13, 2016 at 11:04:13AM +0800, Baochuan Wu wrote:
> > Thanks Richard.
> > I tried guestfs_set_network, and I think I can successfully use yum -y
to
> > install software. It is a little slow.
>
> Most of the time is taken running yum and downloading packages ...
>
> > My program operates CentOS 6.4 VM virtual disks on CentOS 7, I
installed
> > libguestfs into the CentOS 6.4. After installing, I reboot CentOS 6.4
> but I
> > cannot log into it anymore.
>
> You will need to relabel the filesystem after installing packages, see:
>
>
>
https://github.com/libguestfs/libguestfs/blob/master/customize/customize_run.ml#L415-L430
>
> 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
>