Differences between revisions 11 and 29 (spanning 18 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

Console Access

Remove console access by editing the domain.

Memory

Increase or decrease amount of memory by editing the domain.

Unique keys for ssh

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

Hostname

Change the hostname of your new guest.

cp /etc/hosts /etc/hosts.bak
sed -i "s/stretch-template/clone/g" /etc/hosts
cp /etc/hostname /etc/hostname.bak
sed -i "s/stretch-template/clone/g" /etc/hostname

Root password

Make sure to change the root password.

passwd

-  ⇤ ← Revision 11 as of 2017-11-11 20:54:20 → 
  Size: 1526
  Editor: shran
  Comment:
+   ← Revision 29 as of 2017-12-08 14:08:24 → ⇥
  Size: 1946
  Editor: Kristian Kallenberg
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 2:
+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 3:
+Line 4:
-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.
+== Cloning ==
Use the script below to clone your template.
-Line 5:
+Line 7:
-`clonedomain.sh`
+`domain_clone.sh`
-Line 36:
+Line 38:
-./clonedomain.sh clone
+./domain_clone.sh clone
-Line 39:
+Line 41:
-== Cleaning up Your New Guest ==
+== Console Access ==
Remove console access by [[Domain Editing|editing the domain]].
-Line 41:
+Line 44:
-Before starting
Find the blocksize and the partition layout for the guest
+== Memory ==
Increase or decrease amount of memory by [[Domain Editing|editing the domain]].

== Unique keys for ssh ==
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 44:
+Line 51:
-fdisk -ul /dev/vg2/kvm_clone_vda
+rm /etc/ssh/ssh_host_*
dpkg-reconfigure openssh-server
service sshd restart
-Line 47:
+Line 56:
-Calculate the partition offset. Offset = sector * blocksize. In this case 512 * 499712 = 255852544. mount the partition.
+== Hostname ==
Change the hostname of your new guest.
-Line 49:
+Line 59:
-mount -o loop,offset=255852544 /dev/vg2/kvm_clone_vda /mnt/misc
+cp /etc/hosts /etc/hosts.bak
sed -i "s/stretch-template/clone/g" /etc/hosts
cp /etc/hostname /etc/hostname.bak
sed -i "s/stretch-template/clone/g" /etc/hostname
-Line 52:
+Line 65:
-change the hostname
delete ssh keys
+== Root password ==
Make sure to change the root password.
{{{
passwd
}}}