164 lines
6.1 KiB
Markdown
164 lines
6.1 KiB
Markdown
# mc-packwiz-deploy
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Self-hosted NeoForge Minecraft server with a packwiz modpack that clients pull
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automatically on every launch. Mods are served from an HTTP mirror of the
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server's own mods directory — no Modrinth or CurseForge dependency.
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Everything lives on a ZFS dataset mounted at `/minecraft`.
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## Quick start
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```bash
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./deploy.sh -n "Opengames" -a themiro \
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-u https://games.abdelbaki.eu/mods \
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--accept-eula
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```
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Add `-p 25599` to run on a non-default port. It's written into
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`server.properties`, opened in firewalld, and shown in the player guides — which
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print a bare hostname on 25565 and `host:port` on anything else, since Minecraft
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assumes the default and a needless `:25565` confuses people.
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The NeoForge version is resolved automatically — the newest stable build in the
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series matching your Minecraft version, from the NeoForged maven. Pin one with
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`-N 21.1.248` if you'd rather not track latest.
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Then:
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```bash
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sudo systemctl start minecraft
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journalctl -u minecraft -f
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```
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Send the players `https://<your-host>/setup-windows-packwiz.html` or
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`setup-linux-packwiz.html`. Those are generated with your real pack URL and
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server address already filled in.
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## Re-running
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`deploy.sh` is safe to run repeatedly, and re-running is the intended way to
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apply changed settings — a port change, a different heap size, or a run that
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failed partway and left things half-applied.
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Each run:
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1. Snapshots the dataset (`<pool>@predeploy-<timestamp>`)
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2. Stops the server if it was running
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3. Rewrites `server.properties`, `user_jvm_args.txt` and both unit files
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4. Moves any existing pack to `<pack>.bak.<timestamp>` and rebuilds it
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5. Regenerates the player guides
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6. Starts the server again if it had been running
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**The world and `/minecraft/mods` are never touched.** The pack is moved aside
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rather than deleted, so hand-edited `.pw.toml` files and any git history in the
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pack directory survive.
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`--keep-pack` skips the pack rebuild; `--no-snapshot` skips step 1.
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## What's in here
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| Script | Runs as | Does |
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|---|---|---|
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| `deploy.sh` | you | Runs the two setup scripts in order |
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| `mc-service-setup.sh` | root | `minecraft` user, NeoForge server, systemd units |
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| `packwiz-setup.sh` | you | packwiz install, pack init, mod index, player guides |
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| `mc-refresh-restart.sh` | you | Re-sync the pack after changing mods, then restart |
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| `build.sh` | you | Builds the release zip |
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## Pack HTTP server
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`packwiz-http.service` serves the pack, the mod jars and the setup guides on
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port 18080 (`-H` to change, `-B` to change the bind address, `--no-http` to skip
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it). Put a reverse proxy in front of it.
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It serves an **allowlist**, not the whole share: `mods/`, `packs/`, and
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`setup-*.html`. Everything else 404s. That is deliberate — the same directory
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holds `server.properties` (which can carry an rcon password), `ops.json`,
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`whitelist.json`, `usercache.json`, logs and the world.
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`pack.toml` and `index.toml` are sent with `Cache-Control: no-cache`, so the
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proxy can't hand clients a stale pack. Jars are pinned by hash in the index and
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cache freely.
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If the mirror is only reachable over plain HTTP from the machine building the
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pack, but clients need the public HTTPS URL, use `-S https` — it rewrites the
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scheme on every generated URL.
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## Memory
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The heap defaults to 10 GB (`-X`/`-x` to change it). `-XX:+AlwaysPreTouch` means
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the JVM commits the whole heap at startup rather than growing into it, so the
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number you set is the number actually taken.
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On a ZFS host, cap the ARC to go with it — ZFS defaults to using up to half of
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RAM for cache, and will otherwise contend with the JVM for the same pages:
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```bash
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echo "options zfs zfs_arc_max=2147483648" | sudo tee /etc/modprobe.d/zfs.conf
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sudo dracut --force && sudo reboot
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```
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That pins the ARC to 2 GB. On a 16 GB box that leaves roughly 4 GB for the OS
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and anything else the host runs, which is comfortable.
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## Requirements
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- Fedora (or any systemd distro; `dnf` calls need swapping otherwise)
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- A ZFS dataset mounted at `/minecraft`
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- Java 21
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- A web server already publishing `/minecraft` — `/mods` and `/packs` must be
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reachable over HTTP
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Every script refuses to run if `/minecraft` isn't a mountpoint. An unmounted
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dataset leaves it as an empty directory on the root filesystem, and writing a
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world or a mod mirror there fills the root disk instead of the pool.
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## Day-to-day
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Add or remove a jar in `/minecraft/mods`, then:
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```bash
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./mc-refresh-restart.sh
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```
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That registers new mods, re-pins any whose file changed, drops metadata for
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deleted ones, takes a ZFS snapshot, restarts the server, and prunes to the
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8 most recent snapshots. Players get the change on their next launch.
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It refuses to restart if any mod failed to register, so the server never comes
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up on a half-synced pack. Edit the config block at the top first — `PACK_DIR`,
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`BASE_URL`, and `PACK_URL` need to match your deployment.
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## The server unit
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`minecraft.service` pairs with `minecraft.socket`, a console FIFO at
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`/run/minecraft-console`. That's what makes a clean shutdown possible:
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```bash
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sudo systemctl stop minecraft # sends "stop", world saves properly
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echo "say hello" | sudo tee /run/minecraft-console
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journalctl -u minecraft -f # console output
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```
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Without the FIFO, systemd would SIGTERM the JVM and risk cutting a world save
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in half.
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## Web server
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`/minecraft` needs to be served over HTTP. Serve `pack.toml` and `index.toml`
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with `Cache-Control: no-cache` — a caching proxy will otherwise hand clients a
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stale pack while the server runs the new one. `mc-refresh-restart.sh` checks for
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exactly that and stops before restarting if it finds it.
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## Caveats
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- `packwiz-setup.sh` probes `packwiz --help` at runtime rather than assuming
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flag names, since the NeoForge options have moved between builds. If it bails
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with an interface complaint, the installed packwiz differs from what's
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expected.
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- Mod names come from filenames with the trailing version stripped
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(`create-1.21.1-6.0.4.jar` → `create`). It's a heuristic; rename the
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generated `.pw.toml` files if you don't like the result.
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- Hashes are pinned. Replacing a jar in place under the same filename requires
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a re-sync, or clients fail the hash check.
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