= KVM Guest Operating System =

The KVM Guest is a sparse installation.

== KVM Guest Template ==

=== Install Debian ===

Define your [[KVM Guest Disk Layout|disk layout]], then go ahead and install Debian. Make sure this is an installation with a minimum of packages. Once Debian has been installed, leave the template alone. On a fresh minimal installation, not much diskspace is used.
{{{
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_os-root  1,9G  791M  954M   46% /
/dev/vda1             243M   53M  162M   25% /boot
}}}

== KVM Guest Clone ==

=== Clone Your Template ===

Start by [[Domain Cloning|cloning your template]].

=== Configure the New Guest ===

==== Root Password ====

Reset your root passwd.

{{{
passwd
}}}

==== Hostname ====

Your new system will need a new hostname.

 * /etc/hostname
 * /etc/hosts

{{{
sed -i 's/stretch-template/clone/g' /etc/hosts
sed -i 's/stretch-template/clone/g' /etc/hostname
}}}

==== Unique sshd keys ====

Make sure your clone does indeed have unique ssh keys. This is a really important step when cloning. Consider all your clones had the same ssh keys, that would really be a mess.

{{{
rm /etc/ssh/ssh_host_*
dpkg-reconfigure openssh-server
service sshd restart
}}}

==== Update ====
Make sure downloaded .deb files are removed after they have been installed.
{{{
echo "APT::Keep-Downloaded-Packages \"false\";" > /etc/apt/apt.conf.d/01keep-debs
}}}

Since the template can be quite old, you might as well update the new system.

{{{
apt-get update
apt-get upgrade
}}}