How to Host a Star Technology Server (Forge 1.20.1 GregTech Skyblock)

Start from at least 8 GB of RAM. That's the floor Star Technology's own pack recommendation is built around, and GregTech CEu's ore-processing chains and multi-block machines are heavy enough that going lower leaves no headroom once a few machine lines are running at once.

Import the actual modpack file rather than guessing from a client export. Upload the official Star Technology server pack directly so the Forge version, mod list, and GregTech CEu config all match what players installed locally — a mismatched config is a common source of machine recipes silently failing.

Watch the first boot all the way through. GregTech CEu registers a large number of multi-block structures and ore-gen layers on startup, and the skyblock world needs its custom dimension and starting island to generate cleanly before you consider the server ready.

Only invite players once that first boot has finished without errors in the console. Letting people join mid-generation on a GregTech skyblock pack risks players spawning before the starting island or machine recipes are fully registered.

Take a backup before importing a world, updating the Forge/GregTech CEu loader, or changing machine configs. Star Technology progression is built around long multi-block processing chains — losing one mid-run to an untested change costs hours, not minutes.