Differences between revisions 1 and 8 (spanning 7 versions)

KVM Guest Operating System

The KVM Guest is a sparse installation.

KVM Guest Template

Install Debian

Define your 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/vg1-root  1,9G  791M  954M   46% /
/dev/vda1             243M   53M  162M   25% /boot

KVM Guest Clone

Clone Your Template

Start by 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

None: KVM Guest Operating System (last edited 2020-12-13 12:38:05 by Kristian Kallenberg)

-  ⇤ ← Revision 1 as of 2017-11-11 23:37:45 → 
  Size: 1088
  Editor: shran
  Comment:
+   ← Revision 8 as of 2018-01-01 20:57:36 → ⇥
  Size: 1614
  Editor: Kristian Kallenberg
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 9:
-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.
+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/vg1-root  1,9G  791M  954M   46% /
/dev/vda1             243M   53M  162M   25% /boot
}}}
-Line 15:
+Line 20:
-Start by [[Domain Cloning|cloning your template]],
+Start by [[Domain Cloning|cloning your template]].
-Line 37:
+Line 42:
-service hostname restart
-Line 40:
+Line 44:
-==== sshd ====
+==== Unique sshd keys ====
-Line 42:
+Line 46:
-Make sure the ssh keys are unique.
+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.
-Line 51:
+Line 55:
+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
}}}