Corallium Studios
MinecraftFree template

Minecraft Custom JAR Server

This free NautilusControl template sets up a Minecraft Custom JAR server on port 25565 with 2 GB of RAM recommended. This page covers the ports to open, hardware requirements, the Docker image and step-by-step setup.

Deploy with NautilusControl
  • Version v1.0.0
  • Updated
  • 0 downloads
  • By Corallium Studios

Custom JAR at a glance

Category
Minecraft (Minecraft server)
Docker image
eclipse-temurin:17-jre-alpine
Default version
latest
Java version
Java 17
Ports
25565/TCP
RAM
2 GB
CPU
2 cores
Disk
10 GB
Console
Interactive console
Template version
v1.0.0

Custom JAR server ports

A Minecraft Custom JAR server built from this template listens on this port. Open it in your firewall so players and clients can connect.

PortProtocolUsed for
25565TCPGame
Ubuntu firewall (ufw)
sudo ufw allow 25565/tcp

Custom JAR server requirements

2 GBRAM
2 coresCPU
10 GBDisk

These are the template's recommended starting values. Increase it for more players, mods or plugins.

Run Custom JAR in Docker

The template uses the eclipse-temurin:17-jre-alpine image, default version latest. NautilusControl pulls it automatically; to fetch it yourself:

Pull the image
docker pull eclipse-temurin:17-jre-alpine
Start command
java -Xmx{memory}M -Xms512M -jar {customJar} nogui

Files and folders

  • /data/world — World
  • /data/logs — Logs

How to set up a Minecraft Custom JAR server with NautilusControl

  1. Install NautilusControl

    Install the NautilusControl panel and agent on the machine that will run the server. The installation guide covers it, and the 14-day free trial includes 1 node and 5 servers.

  2. Import the Custom JAR template

    Download this template (a single JSON file) with the button above, then open Templates in NautilusControl and choose Import JSON.

  3. Create the server

    Create a new container and pick Custom JAR. NautilusControl pulls eclipse-temurin:17-jre-alpine and creates the folders for you.

  4. Open the ports

    Allow port 25565 through your firewall, and forward it on your router if people connect from outside your network.

  5. Start it

    Press Start and follow the startup log in the panel, then use the interactive console for commands.

Custom JAR FAQ

What ports does a Custom JAR server use?

This template uses port 25565 (Game). Open it in your firewall and forward it on your router if players connect from outside your network.

How much RAM does a Custom JAR server need?

The template recommends 2 GB of RAM, 2 cores, 10 GB of disk space. Increase it for more players, mods or plugins.

Which Java version does Custom JAR need?

This template runs on Java 17. NautilusControl uses a Docker image with the right Java runtime, so you don't install Java yourself.

Can I run Custom JAR in Docker?

Yes. The template uses the Docker image eclipse-temurin:17-jre-alpine. NautilusControl pulls it and creates the container for you.

Is the Custom JAR template free?

Yes. Every template in the Corallium Studios library is free to download. You need NautilusControl to deploy it; there is a 14-day free trial.