Creating Appliances › Create a Singleton

Create a Singleton

Once you have selected the template, you will create a new singleton class for your appliance.

Important! Configure the new singleton to require a minimum of 128M of memory to run, even if the software planned for installation does not need this much. The resource requirement can be changed later when the installation of software on the new appliance is completed, however it is critical to have the extra memory during installation, because the base appliance images (like LUX) do not have swapping enabled and package installers need a lot of memory to work. In particular, yum is known not to work with less than 96Mb of system memory.

To create a singleton class

1. Create a new application (or use an application you already have, like the sample app)
2. Drag the template chosen in the previous step from the global catalog onto the canvas
3. Branch the template class (right-click on the instance shape on the canvas and click Branch Class)
4. Confirm that it is OK to save the application; wait until the branch operation completes and reloads the application

   Note: When you try to branch the class, if you get a second warning window saying that there is no instance volume already copied, select OK to proceed. In this case, the branch process may take a few minutes, as CA 3Tera AppLogic is making copies of the appliance volume.

   You now have a singleton class ready for customization.