// modpack server guide
Fate's Machinery server hosting & setup guide
A Fate's Machinery server needs Java 21 and about 4.5–6.5 GB of RAM for up to 15 players.
轻量级机械动力整合包，基于最新NeoForge优化，专注自动化玩法，流畅低耗。 Lightweight Create modpack on NeoForge, optimized for smooth automation gameplay.
Summary from Fate's Machinery (FOM) on Modrinth.
Fate's Machinery (FOM) is a NeoForge modpack for Minecraft 1.21.1 with 112 mods, 86 of which run on the server. We'd pick our Premium plan (8 GB) for it.
Quick facts
| Loader | NeoForge |
|---|---|
| Minecraft versions | 1.21.1 |
| Java needed | Java 21 for Minecraft 1.21.1 Java version chart. |
| Mods | 86 run on the server112 in the pack. The other 26 are client-only, and the server skips them. |
| RAM | About 3–4 GB for 1–3 playersBy player count. |
| Downloads | 383,611 on Modrinth |
| Last updated | September 30, 2026 (version 2.39) |
| First published | March 27, 2025 on Modrinth |
| Server support | Required: the pack has mods that must run on the server. |
| Server pack | Not published separatelyHow to build the server. |
| Modrinth tags | lightweight, optimization, technology |
Fate's Machinery server files
No. Fate's Machinery has no separate server pack on Modrinth, so the server is built from the .mrpack: the NeoForge server for Minecraft 1.21.1, plus the pack's overrides folder and the server-side mods its modrinth.index.json lists. A modpack installer does this for you; our guide shows how to make a server for a modpack with no server pack.
How much RAM does a Fate's Machinery server need?
| Players online | RAM | DSN plan |
|---|---|---|
| 1–3 players | About 3–4 GB | Standard (4 GB) |
| 4–8 players | About 3.5–5 GB | Premium (8 GB)Standard (4 GB) can do if players stay close. |
| 9–15 players | About 4.5–6.5 GB | Premium (8 GB) |
Estimated from 86 mods on the server with our RAM calculator, not measured: low end if players stay together, high end if they spread out.
By this estimate Standard (4 GB) can run a small group. Our pick below, Premium, leaves room for more players and for the pack growing with updates.
Set Java's heap (-Xmx) 10–15% under the RAM you have, about -Xmx7000M on 8 GB. NeoForge 1.21.1 reads it from user_jvm_args.txt: uncomment the -Xmx line. RAM guide.
Fate's Machinery server requirements
| Java | Java 21 |
|---|---|
| Loader | NeoForge for Minecraft 1.21.1 |
| CPU | Fast single-core speed (one main thread). |
| RAM | About 3–6.5 GB for 1–15 players (table above) |
| Disk | The server files, a growing world and backups |
| Network | TCP port 25565 open to players |
Recommended plan
Our pick for Fate's Machinery
Premium
8 GB RAM · planned launch price $30/month
At about 86 NeoForge mods this is a mid-size pack, and 8 GB gives it room for the mods plus the chunks your players load.
Ordering is closed until we relaunch. We aren't taking orders or payments while we move to new hardware. Join the launch list and we'll email you when Premium servers open.
More than 15 players, or lots exploring at once? Go up to Heavy (12 GB). Not sure? Email hello@dsnservers.com.
Planned launch price in USD, billed monthly once ordering opens, with a 7-day refund window.
How to make a Fate's Machinery server on your own PC
What's specific to Fate's Machinery, step by step. The full walkthrough for any pack: how to make a modded Minecraft server.
- Install Java 21.
Check with
java -version. Java version chart. - Get the server files.
Build them from the .mrpack, as in server files above.
- Start it and accept the EULA.
Run the start script in the server files, or the
run.sh/run.batthe NeoForge 1.21.1 installer writes, then seteula=trueineula.txtif you accept Mojang's EULA (EULA step). - Set the RAM with
-Xmx, sized from the table above. - Let friends connect: forward TCP 25565, or use a tunnel or host behind CGNAT (can't connect?).
Or run Fate's Machinery on DSN
Once we relaunch (join the launch list), on DSN you'd install Fate's Machinery from the panel's Modrinth modpack installer (version 2.39), pick Java 21 on the Startup tab and accept the EULA in the console. No port forwarding.
How to play Fate's Machinery with friends
Each player installs Fate's Machinery version 2.39 with the Modrinth App or Prism Launcher, the same version as the server, and adds the server's address under Multiplayer.
Different versions of Fate's Machinery on the server and a client show up as Mismatched mod channel list or mod rejections. Why friends can't join, timeouts included.
Lag and performance on Fate's Machinery
Can't keep up! Is the server overloaded? means ticks take longer than 50 ms; more RAM won't fix that once Fate's Machinery has enough (tick lag guide). For Fate's Machinery:
- Measure first: spark's
/spark tpsand profiler work on 1.21.1 and name the mod or machine using the tick time. - Distances:
view-distance=8and a lowersimulation-distanceinserver.properties. - Pre-generate: Chunky for 1.21.1,
/chunky radius 3000then/chunky start, before people explore.
Common Fate's Machinery crashes
What a NeoForge 1.21.1 server running Fate's Machinery hits most. For any other error, paste the log into the free crash log analyzer.
- Wrong Java version. Fate's Machinery on Minecraft 1.21.1 needs Java 21. Started on Java 17, it stops with
UnsupportedClassVersionError: ... class file version 65.0, this version of the Java Runtime only recognizes class file versions up to 61.0. Java version fix. - Out of memory. Fate's Machinery (86 mods on the server) needs about 3–4 GB for 1–3 players;
java.lang.OutOfMemoryErrormeans it ran out. Out-of-memory fix. - Client-only mod on the server. Fate's Machinery includes 26 client-only mods, which a server install skips; copying a player's mods folder brings them back and stops the server. Check a mods list with the client-or-server-side checker. Client-only mod fix.
- After adding or updating a mod. Mods you add to Fate's Machinery by hand usually crash it with a missing dependency or a mixin conflict.
- Ticking entity or block entity. The crash report names it and gives its coordinates. Ticking entity fix.
Updates and support
Before moving Fate's Machinery past version 2.39, back up the world: see updating a modpack server without losing your world.
Bugs in Fate's Machinery itself go to its authors through its Modrinth page. Server problems on DSN: hello@dsnservers.com or Discord.
Packs like Fate's Machinery
More: NeoForge server hosting, all modpack guides and how to make a modded server.
Run Fate's Machinery on DSN when we relaunch.
Our pick, Premium: 8 GB, planned at $30/month.
DSN Servers isn't affiliated with Fate's Machinery (FOM) or Modrinth. The pack's icon, summary and stats come from Modrinth's public API (checked October 4, 2026).