Re: [Libguestfs] IRC question about virt-builder ubuntu-* images

On Tue, Jul 12, 2016 at 07:40:51PM +0200, Guido Günther wrote: > On Sat, Jul 09, 2016 at 08:20:27AM +0100, Richard W.M. Jones wrote: > > > > 22:06 < adam12> rwmjones: If you're still around, just curious - any reason why the ubuntu14 image doesn't come with `dpkg-reconfigure openssh-server` > > already configured for firstboot? > > > > The reason is because I couldn't work out how to automate this in the > > preseed script. If you want to have a go, then see: > > > > https://github.com/libguestfs/libguestfs/blob/master/builder/website/ubun... > > https://github.com/libguestfs/libguestfs/blob/master/builder/website/ubun... > > s.th. like > > d-i preseed/late_command string \ > in-target dpkg-reconfigure openssh-server; > > If you need special vealues before hand there's debconf-set-selection Thanks Guido (.. and long time, no see :-) I guess you noticed we are using your example for preseeding Debian images which was very helpful. The above preseed command works to run 'dpkg-reconfigure openssh-server'. I tested this by adding it to the debian.preseed file, recreating the debian-8 image and testing it again. Unfortunately that command creates SSH host keys in the template, which is not a good thing since virt-builder will duplicate the template multiple times and each copy will share the same key. But luckily we also run virt-sysprep on the template after creating it which deletes those host keys: http://libguestfs.org/virt-sysprep.1.html#ssh-hostkeys That resolves the above problem. But unluckily the Debian openssh package doesn't automatically recreate host keys when it starts up, as Fedora does, see the several sshd*.{service,target} files here: http://pkgs.fedoraproject.org/cgit/rpms/openssh.git/tree/ I think this is a bug or missing functionality in the Debian openssh package.