Differences between revisions 11 and 22 (spanning 11 versions)

Domain Cloning

Once a template system has been installed, that system can be cloned. virt-clone will automatically change the MAC address of your network device.

Cloning

Use the script below to clone your template.

domain_clone.sh

   1 #!/bin/sh
   2 
   3 LVM_GROUP="vg2"
   4 NAME_ORIGINAL="stretch-template"
   5 LVM_NAME_ORIGINAL="kvm_${NAME_ORIGINAL}_vda"
   6 LVM_SIZE_ORIGINAL=`lvs /dev/${LVM_GROUP}/${LVM_NAME_ORIGINAL} -o LV_SIZE --noheadings --units B --nosuffix`
   7 NAME_CLONE="stretch-clone"
   8 LVM_NAME_CLONE="kvm_${NAME_CLONE}_vda"
   9 
  10 if [ $# -gt 0 ]
  11 then
  12         NAME_CLONE=${1}
  13         LVM_NAME_CLONE="kvm_${NAME_CLONE}_vda"
  14 fi
  15 
  16 if [ ! -e /dev/${LVM_GROUP}/${LVM_NAME_CLONE} ]
  17 then
  18         # create lvm partition
  19         lvcreate --size ${LVM_SIZE_ORIGINAL}B --name ${LVM_NAME_CLONE} ${LVM_GROUP}
  20 
  21         # clone the domain
  22         virt-clone --original ${NAME_ORIGINAL} --name ${NAME_CLONE} --file /dev/${LVM_GROUP}/${LVM_NAME_CLONE} --check path_in_use=off,path_exists=off
  23 else
  24         echo "${0}: refusing to overwrite existing domain"
  25 fi

Make a clone.

./domain_clone.sh clone

Cleanup

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

sshd

Make sure the ssh keys are unique.

rm /etc/ssh/ssh_host_*
dpkg-reconfigure openssh-server

Root Password

Reset your root passwd.

passwd

Update

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

apt-get update
apt-get upgrade

Console Access

Remove console access by editing the domain.

-  ⇤ ← Revision 11 as of 2017-11-11 20:54:20 → 
  Size: 1526
  Editor: shran
  Comment:
+   ← Revision 22 as of 2017-11-11 22:43:53 → ⇥
  Size: 1796
  Editor: shran
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 3:
-Once a template system has been installed, that system can be cloned. `virt-clone` will automatically change the MAC address of your network device. Use the script below to clone your template.
+Once a template system has been installed, that system can be cloned. `virt-clone` will automatically change the MAC address of your network device.
 Line 5:
-`clonedomain.sh`
+== Cloning ==

Use the script below to clone your template.

`domain_clone.sh`
-Line 36:
+Line 40:
-./clonedomain.sh clone
+./domain_clone.sh clone
-Line 39:
+Line 43:
-== Cleaning up Your New Guest ==
+== Cleanup ==
-Line 41:
+Line 45:
-Before starting
Find the blocksize and the partition layout for the guest
+=== Hostname ===

Your new system will need a new hostname

 * /etc/hostname
 * /etc/hosts
-Line 44:
+Line 53:
-fdisk -ul /dev/vg2/kvm_clone_vda
+sed -i 's/stretch-template/clone/g' /etc/hosts
sed -i 's/stretch-template/clone/g' /etc/hostname
-Line 47:
+Line 57:
-Calculate the partition offset. Offset = sector * blocksize. In this case 512 * 499712 = 255852544. mount the partition.
+=== sshd ===

Make sure the ssh keys are unique.
-Line 49:
+Line 62:
-mount -o loop,offset=255852544 /dev/vg2/kvm_clone_vda /mnt/misc
+rm /etc/ssh/ssh_host_*
dpkg-reconfigure openssh-server
-Line 52:
+Line 66:
-change the hostname
delete ssh keys
+=== Root Password ===

Reset your root passwd.

{{{
passwd
}}}

== Update ==

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

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

== Console Access ==

Remove console access by [[Domain%20Editing|editing the domain]].