// modpack server guide
Zombie Apocalypse server hosting & setup guide
A Zombie Apocalypse server needs Java 17 and about 4.5–6.5 GB of RAM for up to 15 players.
Experience never seen zombie apocalypse with guns for fabric
Summary from Zombie Apocalypse on Modrinth.
Zombie Apocalypse is a Fabric modpack for Minecraft 1.20.1 with 104 mods. We'd pick our Premium plan (8 GB) for it.
Quick facts
| Loader | Fabric |
|---|---|
| Minecraft versions | 1.20.1 |
| Java needed | Java 17 for Minecraft 1.20.1 Java version chart. |
| Mods | 104 modsCounted from the pack's file list on Modrinth. None are marked client-only. |
| RAM | About 3–4 GB for 1–3 playersBy player count. |
| Downloads | 239,924 on Modrinth |
| Last updated | November 27, 2024 (version 1.1) |
| First published | November 10, 2024 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 | adventure, challenging, optimization, combat, lightweight |
Zombie Apocalypse server files
No. Zombie Apocalypse has no separate server pack on Modrinth, so the server is built from the .mrpack: the Fabric server for Minecraft 1.20.1, 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 Zombie Apocalypse 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 104 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. Fabric 1.20.1 takes it in the java command (-Xmx), usually in the start script. RAM guide.
Zombie Apocalypse server requirements
| Java | Java 17 |
|---|---|
| Loader | Fabric for Minecraft 1.20.1 |
| 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 Zombie Apocalypse
Premium
8 GB RAM · planned launch price $30/month
At about 104 Fabric 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 Zombie Apocalypse server on your own PC
What's specific to Zombie Apocalypse, step by step. The full walkthrough for any pack: how to make a modded Minecraft server.
- Install Java 17.
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
java -jaron the Fabric 1.20.1 server launcher, 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 Zombie Apocalypse on DSN
Once we relaunch (join the launch list), on DSN you'd install Zombie Apocalypse from the panel's Modrinth modpack installer (version 1.1), pick Java 17 on the Startup tab and accept the EULA in the console. No port forwarding.
How to play Zombie Apocalypse with friends
Each player installs Zombie Apocalypse version 1.1 with the Modrinth App or Prism Launcher, the same version as the server, and adds the server's address under Multiplayer.
Different versions of Zombie Apocalypse 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 Zombie Apocalypse
Can't keep up! Is the server overloaded? means ticks take longer than 50 ms; more RAM won't fix that once Zombie Apocalypse has enough (tick lag guide). For Zombie Apocalypse:
- Measure first: spark's
/spark tpsand profiler work on 1.20.1 and name the mod or machine using the tick time. - Distances:
view-distance=8and a lowersimulation-distanceinserver.properties. - Pre-generate: Chunky for 1.20.1,
/chunky radius 3000then/chunky start, before people explore.
Common Zombie Apocalypse crashes
What a Fabric 1.20.1 server running Zombie Apocalypse hits most. For any other error, paste the log into the free crash log analyzer.
- Wrong Java version. Zombie Apocalypse on Minecraft 1.20.1 needs Java 17. Started on Java 8, it stops with
UnsupportedClassVersionError: ... class file version 61.0, this version of the Java Runtime only recognizes class file versions up to 52.0. Java version fix. - Out of memory. Zombie Apocalypse (104 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. The Zombie Apocalypse pack file marks none of its mods client-only, so this usually means one was copied over from a player's mods folder. 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 Zombie Apocalypse 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 Zombie Apocalypse past version 1.1, back up the world: see updating a modpack server without losing your world.
Bugs in Zombie Apocalypse itself go to its authors through its Modrinth page. Server problems on DSN: hello@dsnservers.com or Discord.
Packs like Zombie Apocalypse
More: all modpack guides and how to make a modded server.
Run Zombie Apocalypse on DSN when we relaunch.
Our pick, Premium: 8 GB, planned at $30/month.
DSN Servers isn't affiliated with Zombie Apocalypse or Modrinth. The pack's name, icon, summary and stats come from Modrinth's public API (checked October 4, 2026).