Citrix Systems 6.2.0 manual Preparing to Clone a Linux VM, Additional Debian Notes, Machine Name

Linux Distribution	Installation Notes
Oracle Enterprise Linux 6.0, 6.1, 6.2 (32-/64-bit)	None.
Debian Squeeze 6.0 (32-/64-bit)	When a private mirror is specified in XenCenter this
	is only used to retrieve the installer kernel. Once the
	installer is running you will again need to enter the
	address of the mirror to be used for package retrieval.
Ubuntu 10.04 (32-/64-bit)	For Ubuntu 10.04 VMs with multiple vCPUs, Citrix
	strongly recommends that you update the guest kernel
	to "2.6.32-32 #64". For details on this issue, see
	the Knowledge Base article CTX129472 Ubuntu 10.04
	Kernel Bug Affects SMP Operation.
Ubuntu 12.04 (32-/64-bit)	None.

5.6.1. Additional Debian Notes

5.6.1.1. Apt Repositories

For infrequent or one-off installations, it is reasonable to directly use a Debian mirror. However, if you intend to do several VM installations, we recommend that you use a caching proxy or local mirror. Apt-cacheris an implementation of proxy server that will keep a local cache of packages. debmirror is a tool that will create a partial or full mirror of a Debian repository. Either of these tools can be installed into a VM.

5.7. Preparing to Clone a Linux VM

Typically, when cloning a VM or a computer, unless you "generalize" the cloned image, attributes unique to that machine, such as the IP address, SID, or MAC address, will be duplicated in your environments.

As a result, XenServer automatically changes some virtual hardware parameters when you clone a Linux VM. If you copy the VM using XenCenter, XenCenter automatically changes the MAC address and IP address for you. If these interfaces are configured dynamically in your environment, you might not need to make any modifications to the cloned VM. However, if the interfaces are statically configured, you might need to modify their network configurations.

The VM may need to be customized to be made aware of these changes. For instructions for specific supported Linux distributions, see Section B.1, “Release Notes”.

5.7.1. Machine Name

A cloned VM is another computer, and like any new computer in a network, it must have a unique name within the network domain it is part of.

5.7.2. IP address

A cloned VM must have a unique IP address within the network domain it is part of. Generally, this is not a problem if DHCP is used to assign addresses; when the VM boots, the DHCP server will assign it an IP address. If the cloned VM had a static IP address, the clone must be given an unused IP address before being booted.

5.7.3. MAC address

There are two situations when Citrix recommends disabling MAC address rules before cloning:

1.In some Linux distributions, the MAC address for the virtual network interface of a cloned VM is recorded in the network configuration files. However, when you clone a VM, XenCenter assigns the new cloned VM a

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