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Continuing to move forward with the XenServer series, this article will approach the creation of the actual guests themselves (often called virtual machines). This article will assume all the previous articles covering networking, patching, and storage have been completed. This portion of the guide will be relying on ISO installers to actually boot the newly created guest machine and install an operating system.
XenServer comes with a series of templates that can be used to quickly provision a virtual guest. These options can be manually modified later but for now a simple template will be used to illustrate their usage. This will allow for easier parsing of the available templates to locate the necessary UUID information. Selecting Debian 7 won’t affect anything in the operation of the actual operating system.
This may seem trivial to set but from experience, this has prevented a serious issue when detaching a storage repository from one XenServer and attempting to attach it to another XenServer. The next house keeping step for this article is to provide this particular guest with more resources. The box in green above indicates that the most memory that this particular guest could ever have is about 256 MiB. The third command is used to determine the UUID for the newly added CD-ROM to continue setting up the device to boot the Debian ISO. The next step is to make the CD-ROM bootable as well as instruct the guest to install an operating system from the CD-ROM.
The first command above sets the CD-ROM to be bootable by using its UUID highlighted in green in the above screen-shot. Looking back at the XenServer networking article, a special VLAN was already created for this guest and it was VLAN 10. This process involves creating an SSH tunnel from the Linux computer to the XenServer host and then port forwarding a VNC connection through that tunnel.
With the above information obtained, it is time to switch to a Linux station and connect to the XenServer to view the console session of this guest.
The first step is to ensure that OpenSSH client and xtightnvcviewer are installed on the Linux host. Up to this point, everything with XenServer has been done via command line interface (CLI).


He is an Instructor of Computer Technology with Ball State University where he currently teaches all of the departments Linux courses and co-teaches Cisco networking courses. Thankfully, no more new terminology really needs to be discussed and the creation of the guests can begin!
This will serve as a quick review about what has been configured and which article the topic was discussed.
To obtain the list of available templates, the traditional 'xe' command can be passed different arguments to prompt the system to return the templates available. This article is going to be working with Debian 8 Jessie but will require the use of the older Debian 7 Wheezy template until Citrix releases the new template.
There are a couple of house keeping steps that can potentially make things easier in the future.
To many people this issue is minor but for house keeping purposes a more descriptive name is desired to keep track of the purpose of this particular VDI. This particular scenario, a metadata backup of all the guest information failed to be restore-able on the new XenServer and thankfully by naming the VDI on each of the guests, proper mapping of the guest to its VDI was able to be done simply by the name-label. For testing purposes this would be okay but for any sort of heavy use system, this would prove to be insufficient.
In this example, the amount of ram to be given to this machine will be represented in bytes but will equal 2 Gibibytes worth of ram.
From the previous article about Storage Repositories, a Samba share was added to this XenServer to store ISO installer files.
Once the XenServer is confirmed to see the ISO storage repository, a virtual CD-ROM needs to be added to the guest in order to boot the ISO file. The next command will add a virtual CD-ROM device to the TecmintVM guest and assigns it the device ID of 3. The second command instructs the guest to use the CD-ROM as the method for installing the operating system.
This is especially important for this install method since the Debian Network installer is being used and will need to pull packages from the Debian repositories. The next command is used to create a network adapter for the guest and attach the network adapter to the proper network.
It is very clever and works wonderfully but this method does assume that the user can access the XenServer over SSH. To do this, an SSH tunnel will be created and port forwarding will be setup to direct a local VNC connection through the SSH tunnel.


The next step is to create an SSH tunnel to the XenServer host and setup port forwarding to the VNC port determine earlier on the XenServer host (5902).
The first port can be any port above 1024 that isn’t in use on the Linux Mint machine.
There is the TecmintVM console session running the Debian Network Installer waiting for the installation process to begin.
While many Linux users enjoy the CLI, there are utilities that exist to simplify the process of managing XenServer hosts and pools.
He is an avid Debian user as well as many of the derivatives of Debian such as Mint, Ubuntu, and Kali. Options include things such as hard drive space, CPU architecture, and amount of ram available among other options. The first is to provide a name-label to the newly created VDI and the second is modifying any of the default hardware specifications provisioned by the template. This guide will assume that the Debian Net Installer ISO exists on the ISO storage repository. The next command requires that number in order to determine the VNC port for the guest console session. This connection will be done from a Linux Mint 17.2 workstation but should be similar for other distributions. The next article in this series will cover the installation of those tools for users who wish to use graphical systems rather than CLI.
Rob holds a Masters in Information and Communication Sciences as well as several industry certifications from Cisco, EC-Council, and Linux Foundation. The output from this command provides the VNC port that can be used to connect to the video out of this particular guest.
So a workaround exists so that users don’t have to create a special Windows station simply to access the console of a running guest.



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