The AutoYaST server can be based on SLES12 (pattern “Base System”) or on SLES15 (pattern “Enhanced Base System”, modules Basesystem and Server-Applications) with the latest support pack. If you follow our recommendation to use HTTP to access the repositories the server also needs to have the apache2 package installed.
The creation of the custom AutoYaST boot medium requires xorriso. On SLES12 this is provided as part of the libburnia-tools package while SLES 15 comes with a xorriso package that you need to install. On SLES15 you also need to install the dosfstools package.