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Custom start commands and Java flags

What you can change in the start command, what needs us, and why memory flags are fixed.

1 min readUpdated 2026-09-14Diese Anleitung auf Deutsch lesen →

The start command itself is set by the server type and is not editable in the panel. This keeps memory settings consistent with what you bought and stops a wrong flag from taking the server down.

What you can change yourself

  • Every variable the command uses (jar file name, version, extra arguments where the egg offers an ARGS/ADDITIONAL_ARGS variable).
  • The Docker image (Java/Node/Python version).
  • For Minecraft: swap the jar file (upload purpur.jar, set SERVER_JARFILE=purpur.jar).

What needs a ticket

  • A different program entirely (Java bot on a Node server, a custom launcher, BepInEx for Valheim, a Fabric server with a custom launcher).
  • JVM flags such as Aikar's on Paper: open a ticket with the server name; we set them within the memory of your plan.

Tell us what the command would look like on your PC. That is all we need.