Before setting up a Minecraft server with Fabric Mod loader, it may be a good idea to install Fabric in a MultiMc instance, download and test all the mods you want in the server in that instance, and once you have everything set up and working, only then set up the server. You can do that here: Installing Fabric using the MultiMC launcher

A Minecraft server requires the Java Runtime Environment. To check if java is installed in your computer, open the Run dialog by using the Windows+R hotkey. Enter cmd in the textbox and click OK This will open a command window.

In the command window type java -version and press Enter

If a Java version number is reported similar to this:

You may skip STEP 3 if you don't want to update or replace the Java version installed.

If Java is not installed, the result will be something like this:

If in STEP 2 you determined that you don't have Java installed, you will need to install it.

If you already have at least Java 8 installed you can skip this step.

To download the Java installer, go here

Pick Version 8 of the JRE, and the HotSpot JVM, download the installer for your operating system and install JAVA.

Go to https://fabricmc.net/use/ and select the “Server” option, then download the Windows exe installer or the Universal JAR installer.

Run the Fabric Installer jar/exe you downloaded. Select the Server tab. Select the Minecraft Version and the Loader Version

In Select Install Location enter the name of the folder where you want the server to be installed. If the folder does not exist the installer will create it.

Click Install

The installation process may take some time, when the install is done, you will see this:

Click on Download server jar to download the Minecraft server.jar file

Click on Generate to generate start.bat and start.sh You can use those batch files to start the server.

You may now close the Fabric Installer.

In the Command Window you opened in STEP 2 type:

cd "c:\mc-server" [ENTER]

Note: If the server path is in another drive, first switch to that drive, for example if the server path is in the D: drive, enter this at the command prompt:

d: [ENTER]

The command prompt should change to:

c:\mc-server>

Now type the following to create the eula.txt file:

echo eula=true>eula.txt [ENTER]

NOTE: The installer now has a button to generate the batch files for you, so the following instructions may be outdated.

NOTE: If you are upgrading Fabric in this server, delete the .fabric folder inside the server folder if it exists. If you are also upgrading the Minecraft version, remember to download the correct server.jar as explained before.

Start the server by typing in the command window:

java -jar fabric-server-launch.jar nogui [ENTER]

If you are using Windows and get a Windows Security Alert, click on Allow access

You should see something like this in the command window:

Now that the server is up and running, you can stop it and create/edit a batch file that starts the server. Type

stop [ENTER]

in the command window to stop the server. Then type the following:

echo java -jar fabric-server-launch.jar nogui>start.bat [ENTER]

If you want to specify how much RAM to allocate to the server, type this instead of line above:

echo java -Xms1024m -Xmx2048m -jar fabric-server-launch.jar nogui>start.bat [ENTER]

Use the values you want for Xms and Xmx

Now type this:

echo pause»start.cmd [ENTER] (that's two “>”, not “»”)

This will create a c:\mc-server\start.bat file that you can use to start the server by double clicking it.

Now you can add mods to the c:\mc-server\mods folder. The easiest way to do this is to copy the mods you have in the MultiMC instance you created to test the mods to include in the server.

You may want to review the mod list in the MultiMC instance by opening the Mod Menu GUI. Any mod labeled as CLIENT you can exclude from the server mods folder.

If you are using Optifine in the multimc instance, do not copy the optifine and optifabric jar files in the server mods folder.

After copying the mod files to the server mods folder, you may also want to copy the MultiMC instance config folder files to the server config folder.

Now restart the server by double clicking the start.bat file.

Some mods that are intended to only be installed in the CLIENT may have bugs and crash the server if you copy those mods to the server mods folder. You will have to determine the mod that is crashing the server by removing mods one by one, or half the mods at a time until you find the mod that is causing the crash. If you encounter this problem, please open an issue in the mod issues page.

If you are going to use a hosted server, and the provider only allows you to use server.jar:

Rename server.jar to vanilla.jar

Rename fabric-server-launch.jar to server.jar

Edit the fabric-server-launcher.properties config file: serverJar=vanilla.jar

This may work if the hosting server only checks for the file name of the jar. If it seems that you are not able to setup a Fabric service on a hosted server, ask the hosting company to add support for Fabric.

• https://fabricmc.net/wiki/tutorial:install_with_multimc
• https://fabricmc.net/use/
• https://www.minecraft.net/en-us/download/server/
• https://adoptopenjdk.net/releases.html
• https://minecraft.gamepedia.com/Tutorials/Setting_up_a_server