Master Computer Preparation


Important: (when cloning an installation) If you are using ISL AlwaysOn 1.2.2 or newer, please follow these instructions, otherwise follow the notice below this one.

ISL AlwaysOn can also be installed in environments where computers are installed as clones from one master image. First ISL AlwaysOn is installed (with predefined changes) onto the master computer, but final steps are then performed on cloned computers.

Before cloning the master image to target computers, the master machine must have ISL AlwaysOn already installed and please make sure that you have granted access to all the desired users (the users that you intend to allow access to cloned computers). Having done that, please follow these steps:

  1. Stop ISL AlwaysOn service on the master machine (go to command prompt and execute net stop isl_always_on)
  2. Close any ISL AlwaysOn computer configuration dialogs that might be running.
  3. Open regedit and navigate to HKEY_LOCAL_MACHINE\SOFTWARE\ISL Online\ISL AlwaysOn
    If you are using 64-bit Windows, the appropriate key is located in HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\ISL Online\ISL AlwaysOn
  4. Delete the binary content key called uid
  5. Create a new binary content key called _ghost_ with content 01

This concludes the preparation steps - you should now shut down the master computer and clone it.  Please be extra careful not to boot the master computer after the last step or the cloning process will not work properly!

Important notice when cloning an installation and using an older version of ISL AlwaysOn (version lower than 1.2.2): In case you are cloning an installation, please make sure that the following key is not present in the registry prior to cloning: HKEY_LOCAL_MACHINE\Software\ISL Online\ISL AlwaysOn\uid

Important: If you are using 64-bit Windows, the appropriate key is located in HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\ISL Online\ISL AlwaysOn\uid

This key represents a unique machine ID and does not get deleted when you uninstall ISL AlwaysOn! If it remains on the machine and gets cloned, then all machines will have this key with the same ID, effectively identifying themselves as the same computer.

To avoid this, please follow the correct procedure for situations where cloning is involved

  1. Make sure that the key mentioned above is not present on the machine before cloning. If you have previously installed ISL AlwaysOn on that machine, it will be there, otherwise not.
  2. Clone the computer to n computers.
  3. Install ISL AlwaysOn manually on each of the n computers.
  4. Each cloned computer will now have a unique machine ID for ISL AlwaysOn and you will see them all in your list of computers.

Important: In an environment where a Web Proxy is used, ISL Light and ISL AlwaysOn use Internet Explorer connection settings. Since ISL AlwaysOn as well as ISL Light with restart and resume enabled run under system account, they use Internet Explorer settings for the system account. It might happen that Internet Explorer settings have not been set for the system account. Please refer to the following topic in the ISL Light manual: Checking system account connection settings

Note: (server license users) The procedure for server license differs from the procedure for hosted service users - please go to this topic for more information.



Tags: isl alwayson, cloning computers, master computer, cloning

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