Differences between revisions 3 and 19 (spanning 16 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

-  ⇤ ← Revision 3 as of 2017-10-12 22:54:27 → 
  Size: 1042
  Editor: shran
  Comment:
+   ← Revision 19 as of 2017-11-11 22:25:46 → ⇥
  Size: 1703
  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. Use the following script 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 8:
+Line 12:
-Line 15:
+Line 20:
-if [ $# -eq 0 ]
+if [ $# -gt 0 ]
-Line 17:
+Line 22:
-        echo "${0}: domain-name"
else
-Line 33:
+Line 36:
+}}}
-Line 34:
+Line 38:
+Make a clone.
{{{
./domain_clone.sh clone
-Line 35:
+Line 42:
+== 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
}}}