Reaper's Sky - Dedicated Server

Everything needed to run the Reaper's Sky NeoForge 1.21.1 server (NeoForge 21.1.248) on Debian 13 (trixie).

Quick start (on the server box)

sudo ./deploy.sh     # installs Java 21 + curl/unzip, NeoForge, the 92 mods, config
./run.sh             # start the server (run inside tmux/screen so it survives logout)

The first ./run.sh generates the world. Wait for Done (...) in the console, then connect with IP reaperofveriod.nl (port 25565).

deploy.sh is idempotent — safe to re-run; it skips anything already in place and verifies every mod by sha1 before installing.

What deploy.sh does

Step	Result
System packages	`openjdk-21-jre-headless`, `curl`, `unzip` (needs root/`sudo`)
NeoForge server	Official installer from Maven → server files + `libraries/`
Mods	Downloads the 92 server-safe mods pinned in `mods.json`, sha1-verified; prunes jars no longer in the pack
Config	`eula.txt` (EULA accepted), `server.properties` (IP, motd, 8 G)
Run script	`run.sh` with 8 GB + G1GC (`nogui`)

Install location defaults to ~/reaper-sky-server. Override with DIR=/path, memory with MEMORY=6G, etc.:

sudo DIR=/srv/minecraft MEMORY=10G ./deploy.sh

Keeping it running

tmux new -s mc                    # new session
cd ~/reaper-sky-server && ./run.sh
# detach with Ctrl-b d, reattach later with: tmux attach -t mc

Stop the server cleanly with the console command stop (Ctrl-c also works).

Configuration notes

server.properties sets online-mode=true (Mojang authentication). Set it to false in ~/reaper-sky-server/server.properties to allow unauthenticated clients, then restart.
server-ip is left empty on purpose: the server binds all interfaces (0.0.0.0) and is reached through the edge router's port-forward. Do not put the public hostname/IP here — it isn't assigned to a local interface and the server will crash with Cannot assign requested address.
difficulty=hard, spawn-protection=0, view-distance=10 are set for the airship-focused, land-claim-friendly experience.
The 17 client-only mods (Iris/shaders, Sodium, Minimap, MouseTweaks, etc.) are intentionally excluded here — everything gameplay-relevant runs on the server too (including JEI and Jade).

Updating the server's mods

The easy way — one command from your PC

If your PC has SSH key access to the server (ssh root@ReapersSky works without a password), you can push mod changes to the live server with a single command run from the repo root on your PC:

python3 server/build_mods.py --push

This does everything:

Scans the Prism instance Reaper's Sky - dev and regenerates server/mods.json (skipping client-only mods).
Uploads that manifest to the server.
On the server: stops it cleanly, syncs mods/ against the manifest (deletes jars that are no longer in the pack, downloads + sha1-verifies new or changed ones), then starts it again.
Waits for boot and prints Server is UP once the log shows Done (...).

No git commit/push is needed first — it works straight from your working tree, so you can test changes on the server before committing them.

Useful variations:

python3 server/build_mods.py --push          # full cycle: stop -> sync -> start
RS_SERVER_HOST=user@otherhost python3 server/build_mods.py --push   # different box

Manual / on-server way

If you already have a mods.json on the server (e.g. uploaded by hand), run this on the server box:

bash ~/update.sh /path/to/mods.json        # stop -> sync -> start
bash ~/update.sh /path/to/mods.json --no-start   # sync only, leave stopped

update.sh is safe to re-run at any time: if the server isn't running it just syncs; every jar is verified by sha1 before it counts as installed.

Full reinstall

For a brand-new box (or to rebuild everything from scratch), use the one-shot installer described at the top — it also prunes stale jars since it shares the same sync logic.

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