Raspberry Pi Minecraft Server 1.13.2 / 1.14.4 Installation Script / Optimization Guide

Many things have changed since I wrote my last Raspberry Pi Minecraft Server guide.  OpenJDK is now the better supported Java for Raspberry Pi and Oracle has discontinued support for Java 8 in January 2019.  Java 11 is out and offers a ton of performance improvements. 

The Raspberry Pi 44 has also arrived!  After testing the server on the 4B 2GB version using OpenJDK 11 I was blown away by the performance and decided to write an updated guide and a script that will have you up and running in minutes.

To give you a taste of how smooth the timings are in OpenJDK 11 headless using the Paper Spigot Minecraft Server here is a nearly 2 hour session I played with my girlfriend.  This was played in survival mode on a brand new server so no blocks had been pregenerated and no settings were modified from the defaults.  Nothing is overclocked except the SD card.  There was even a village right by the spawn so many entities were in use.  Here’s the timings output report:

Raspberry Pi 3B+ Minecraft Server Timings
Raspberry Pi 3B+ Minecraft Config

RPI Minecraft Server Requirements

Minecraft Server Setup Script

SSH into your Raspberry Pi and type/paste the following commands:

wget -O SetupMinecraft.sh https://raw.githubusercontent.com/TheRemote/RaspberryPiMinecraft/master/SetupMinecraft.sh
chmod +x SetupMinecraft.sh
./SetupMinecraft.sh

This will start the server and configuration setup process. It will ask you some questions on how you want to configure the server and then automatically download, setup and start the server. Follow the Minecraft Server setup script in-depth guide here for a walkthrough.

… and we’re done!  The Minecraft server is now in the folder “minecraft”.  To start the server type:

cd minecraft
./start.sh

The server will start in the background using the screen application.  To view the console type:

screen -r minecraft

From this console you can issue any command to the Minecraft server.  The most important one you should know is the command to safely stop the server.  This will save all players and states which is simply “stop” without the quotes. 

To get out of the console without closing the server press Ctrl+A and then Ctrl+D.  This will minimize the screen session and put you back in your main console session.  The screen session will continue to run even if you disconnect from your SSH session to your Pi!

For a more in depth guide/walkthrough of the installation script check out this post covering the setup script in depth.

Pi Specific Performance Optimizations: Storage and GPU Memory

The most important optimization you can make is high performance storage.  Read my Raspberry Pi Storage Benchmarks article to see why some storage mediums are over 1000% faster for I/O which is the most critical factor for a Raspberry Pi Minecraft server.  You can also use USB adapters for mSATA SSDs (cheap on eBay) or a USB to SATA cable if you have a 2.5″ older SSD.

If you are going to use MicroSD anyway you must use a high performance MicroSD card and overclock your SD card reader to obtain the best performance.  It is normally 50hz to ensure compatibility with the cheap low quality cards but goes all the way up to 100hz.  Storage speed is a major bottleneck on the Pi and this increases your read/write speeds. 

The second most important optimization is setting your GPU to only use 16mb of RAM.  Since RAM is at a premium on the Pi it needs need as much as possible (64 MB is used by default).  This is all done in the Raspberry Pi’s /boot/config.txt file.  Type:

sudo nano /boot/config.txt

Then place these lines at the bottom of your config.txt file:

dtparam=sd_overclock=100
gpu_mem=16

Now restart your Pi using

sudo reboot

That’s it!  If your Pi won’t boot up after doing the SD card overclock don’t panic.  Just put the SD card in any computer and remove the line dtparam=sd_overclock=100 from boot.txt.  You can do it from Windows using notepad or any other text editor on any OS as the boot partition is always visible.

If you are using a older Raspberry Pi or a Raspberry Pi Zero then you may want to overclock it as well for smooth performance in game.  My favorite guide for overclocking older Raspberry Pis is located at the one and only RetroPie project wiki page located here.  The CPU and memory overclocking is going to be the most beneficial.

Minecraft Optimizations – The Timings Tool

If you are using an older Pi or have more than a few players using the server you may need to do some optimizations.  The most important thing to understand about optimizing your Minecraft server is to understand what is slowing it down.  There is an extremely useful tool built into the Paper Minecraft server called timings.  In the intro to this post I posted a picture of the graphs from this report.

To start the timings measurements open up your Minecraft console with the screen -r minecraft command like I covered earlier.  Once in the Minecraft console type:

timings on

The longer you take timings the better insight you will get into what is slowing down your server.  It is best to play as you normally would when taking these timings so you are taking accurate measurements.  To generate the report type the following:

timings report

This will give a link to paste in a web browser to view an incredibly detailed report.

Correctly Interpreting Timings

Detailed timings broken down by category

There are several different views available.  It is important not to look only at the “Lag” category but also view the “All” category.  If you only look at “Lag” you’re only seeing part of the picture.  This is useful for identifying major “spikey” slowdowns but not the overall performance of the server.  Check the “All” tab and toggle between total, average and count to understand how your server is performing.

In this example we can see some of the more expensive operations on my server are entities and chunks.  Entities are monsters/animals/items/villagers/etc.  Chunks are the map itself.  If you are doing heavy exploring on a new server you may see very large numbers for chunks.  This is due to the Pi generating them and storing them on the SD card (slow).  If you are spending lots of time in villages or fighting monsters the entities may be high.

Applying Optimizations

If you are not getting good performance and you have ran the timings tool here are some of the usual suspects to look for and possible optimizations to apply:

  • Be careful with mods/plugins – This is one of the most frequent causes of poor performance. Some mods massively increase the load on the server. The best way to find which plugin is doing this is to disable all plugins and enable them one at a time until you see the performance issues and have isolated the problem plugin.
  • Check config files – Configuration files are server.properties, paper.yml, spigot.yml, and bukkit.yml.  If unsure about what a setting does google it or consult the documentation.  If you screw up your configuration unintentionally then you can revert it to default by removing the file and relaunching the server.
  • Lower your entity counts/ranges – Type nano bukkit.yml and in the file you will find spawn-limits: monsters: 70 animals: 15 and several others.  You may lower these numbers to limit the number of entities by type.  Type nano spigot.yml and you will find entity-activation-range and entity-tracking-range.  These control how close you have to be before the server starts making monsters see/track you.
  • Disable the Nether and The End – In server.properties.  In the sample report you will see the Nether uses CPU cycles (we never went there).  When/if your group is ready to go to the Nether you can turn it back on in the properties to re-enable it.  You may disable “The End” in bukkit.yml by setting allow-end: false.
  • Lower the view distance – This should be a last resort but on older Pi hardware or if you want more than a handful of players this is an option.  It will increase performance dramatically because it reduces chunk loading/generation.  Since chunk loading/unloading/generation is very I/O intensive the Pi is not very good at it.  Change it in server.properties and spigot.yml.

Conclusion

The Raspberry Pi performs just fine as a Minecraft server for under 5 players. You can have multiplayer in what feels and runs like a single player experience!

For optimization the most important things you can do are

  • Pick the right storage (SSD or high quality Micro SD) to be able to keep up with block generation
  • Run your timings! This will tell you exactly what is slowing your server down
  • Keep plugins to a minimum to prevent swamping the Raspberry Pi with extra instructions
  • If all else fails lower the view distance

66 thoughts on “Raspberry Pi Minecraft Server 1.13.2 / 1.14.4 Installation Script / Optimization Guide”

  1. Hey. Thank you for the guide. Unfortunately the game crashes constantly (not the pi). What can I do to fix that?
    I tried undoing the overclock, changed the world. I absolutely followed your guide. Is that a known issue? Not sure if anybody will respond but I really hope so. The log says nothing about the crash.

    1. The game crashing is a problem with the computer running it and not the Pi. Nothing changed on the Pi will address that but do some googling with any info about the crash on the PC in question and you should be able to get it going!

  2. Hi, great guide! I had installed server version 1.12 but my client wouldn’t log in (I found I have version 1.13 on my tablet). So I started to search and found your guide. I installed everything successfully and started the server. But I can’t find it from my 1.13 client. The server is 1.14 and I don’t know how to change it (I’m running headless Raspi). At least the 1.12 I was able to see in the Friends tab 🙂
    Any suggestion for me (a noob)? Thanks!

  3. Whenever I close my ssh session the server shuts down. How do you keep the server running without leaving an ssh session open?

    1. Hey Adam,

      The trick is to use the screen program. If you do a screen session and then press Ctrl+A then Ctrl+D it detaches the screen session and continues to run it in the background.

      The script should use these for you but if you run things manually make sure you’re in a screen session and detach!

  4. Great set up, easy to do, and honestly one of the best things that my housing mates and I did… until it stopped working about a week ago. Was wondering if we could get some help and input as all attempts to get the server up and running again have been met with only limited success at best.

    Currently, we have the server running on a Raspberry Pi 4 with 4 gig of memory, using a 32 bit Raspbian operating system. Following the directions from your old walk through, with the updates given here, we had the server up and running since the end of August. However, after a scheduled restart, we’ve run into the issue where the server no longer starts up, and attempts to use the start.sh file generally end in one of two ways. Either it gets so far as checking for an update to Paperclip.jar before crashing or just crashes on start.

    After downloading all of the world backups on a separate flash drive, we have gone so far as to completely wipe and reinstall the Raspbian op onto the Pi, and then done exactly the steps outlined above. The new server will start up normally, and will stop and restart according to the program. However, when the Start.sh file is used, again we run into the same issues of server crashing. As well, the server will not start on start up anymore if we do a restart via the Raspbian OS. The backups seem to be unaffected, as we have been able to get them to run on a separate Windows computer.

    Frankly we are at a loss, and would love some help at figuring out why the server won’t start up anymore on our Raspbian system anymore. Any input would be welcome, and I am happy to answer any questions you might have in order to get this resolved.

    Again, thanks for the walk through, as it was working like a dream before this happened.

    1. Hey Bob,

      That’s awesome that it’s one of the best things you guys have done!

      I’d say the fastest way to narrow things down is to run the server from the command line manually. Go to the minecraft folder on the Pi and run the following command:

      java -jar -Xms400M -Xmx2600M paperclip.jar

      I picked 2600M because it’s slightly under the memory cap for 32 bit Raspbian which should give the server a little bit of breathing room. If anything goes wrong it will give you an error that is easy to paste in here and we can figure out what’s going wrong!

  5. Hello James,

    My son and I followed your guide some time ago and it worked pretty fine in a Pi3B.
    Now we have come back to Minecraft, and found this new guide.
    Everything works even better and we are having a very nice time trying to understand and solve the issues we find.

    Thank you very much

  6. Hi,

    I’ve a question. Which value should the memory split be in th raspi-config with this server? Is it 16 like with the older minecraft server guides? Or is another value recommended?

    Thanks!

    -IJuanTM

  7. Hello,
    I have the following problem starting the server.
    On the server side I get the message:
    “[18:29:43 INFO]: com.mojang.authlib.GameProfile@161aab0[id=,name=KacperRaster,properties={},legacy=false] (https://origin.jamesachambers.com/192.168.1.116:54409) lost connection: Disconnected”

    And on the Minecraft side: login failed, session expired, restart game or luncher

    1. That’s an interesting one. The com.mojang.authlib.GameProfile component is what talks to Mojang when players join your server to retrieve their player game profile such as what skin they have selected, if they have a valid license for the game, etc. The connection to that server is being force closed on it during the middle of authorization so it is kicking you out immediately afterward.

      This is usually a firewall issue. When you connect to the server are you using the public IP or the private IP? I would recommend using the private one (192.x.x.x or 10.x.x.x usually) if you’re on the same network as the Pi as some firewalls aren’t properly configured for hairpin NAT. Also check all rules on any software/hardware firewalls and make sure everything looks good.

      You may also try adjusting the “online-mode” setting in server.properties which can disable checking with Mojang at all. This is a possible solution if you toggle it and the server works fine otherwise.

      This is a fairly uncommon

  8. Hi James,
    Would it be possible to run a 64 bit distribution of java on a raspberry pi 4? I want to run a minecraft server with more than 2gb but can’t figure out how to install java 64 bit.

    1. Yes it’s absolutely possible but you need a 64 bit operating system as well which unfortunately rules Raspbian out (unless you rebuild the kernel as 64 bit which is possible but takes some effort).

      I just did it last night finally for the first time after building the kernel myself (Ubuntu Server 18.04.3) and am working on finishing it up. I was able to allocate the full 4GB of RAM to the server which Raspbian can’t do (you can do up to 2700 on Raspbian 32 bit so if you are only using 2000 go ahead and bump it up to 2700!).

      I’m continuing to work on this and plan on posting some instructions precompiled kernels to help people get 64 bit going while the official support catches up.

  9. Hello, I’m also thinking about building a Minecraft server for under 5 players on a Pi 4 with 4GB RAM, but I want to deploy a Vanilla server instead of Spigot or Paper as you are using here. I’ve read that Spigot and Paper have optimised performance, and I guess that is a reason why they still run well on a Pi 4 despite of its 1.5GHz CPU frequency. Do you have any experience with Vanilla on a Pi? And do you think with Vanilla I can still get good performance? Thank you.

  10. I ran into an issue while running the server and everytime I enter a certain place, The server crashes and start spewing this line :
    [21:44:42] [PaperChunkLoader-4/WARN]: java.lang.RuntimeException: Server attempted to load chunk saved with newer version of minecraft! 1968 > 1631
    [21:44:42] [PaperChunkLoader-4/WARN]: at net.minecraft.server.v1_13_R2.ChunkRegionLoader.a(ChunkRegionLoader.java:302)
    [21:44:42] [PaperChunkLoader-4/WARN]: at net.minecraft.server.v1_13_R2.ChunkRegionLoader.loadChunk(ChunkRegionLoader.java:260)
    [21:44:42] [PaperChunkLoader-4/WARN]: at net.minecraft.server.v1_13_R2.PaperAsyncChunkProvider$PendingChunk.loadChunk(PaperAsyncChunkProvider.java:387)
    [21:44:42] [PaperChunkLoader-4/WARN]: at net.minecraft.server.v1_13_R2.PaperAsyncChunkProvider$PendingChunk.run(PaperAsyncChunkProvider.java:579)
    [21:44:42] [PaperChunkLoader-4/WARN]: at com.destroystokyo.paper.util.PriorityQueuedExecutor.lambda$createPendingTask$1(PriorityQueuedExecutor.java:133)
    [21:44:42] [PaperChunkLoader-4/WARN]: at com.destroystokyo.paper.util.PriorityQueuedExecutor$PendingTask.run(PriorityQueuedExecutor.java:273)
    [21:44:42] [PaperChunkLoader-4/WARN]: at com.destroystokyo.paper.util.PriorityQueuedExecutor.processQueues(PriorityQueuedExecutor.java:196)
    [21:44:42] [PaperChunkLoader-4/WARN]: at java.base/java.lang.Thread.run(Thread.java:834)

    and i run the minecraft server on a Raspberry Pi 3 B+ and at the time of the crash i was the only one in the server
    and i dont know to fix it
    Please help

  11. My server is pretty laggy. Blocks reappear and mobs freeze and skip around. Could you give me some tips on how I could optimize my settings? Because in one of your answers, you said you’ve heard of 12 people getting on a 3B server. I would like my server to run smoothly with 5 people. (I already set the max to 5)

  12. Has anyone been able to use more than ~2800MB with a 4GB RPI4? I get errors from Java when I try to use more than that.

    1. jamesachambers

      I believe you’re hitting the “3 GB Barrier” RAM application size limitation for 32 bit. 64 bit distributions will let you use all of it but support for 64 bit is shaky right now but will stabilize soon.

      1. Ah, okay. Are you planning on changing your script to support 64 bit, or a choice between 32 and 64 bit? For now I would have to manually update to 64 bit OpenJDK?

        1. jamesachambers

          Welcome back Rooster!

          Right now it installs whichever Java is native to the operating system. So on 32 bit that is 32 bit and on 64 bit OS’s it is already 64 bit. The script doesn’t need any changes for it fortunately and you can already do it by running Ubuntu Server.

          All that being said you can absolutely choose whichever Java version to you run that you want. The script will run whichever the default one is on the system.

          1. Oh, so the OS is 32 bit.
            So according to your Ubuntu Server article, Ubuntu 64 bit works with RPi4 but only using 1GB of RAM which kinda defeats the whole point of going 64 bit for a Minecraft server. Bummer. So we just wait for a RPi4 compatible 64 bit OS that allows us to use all 4GB of RAM, and hopefully the 64 bit OS will have better performance than the 32 bit OS because it can take full advantage of the 64 bit CPU?

  13. James, is it easy to set up something like MCMyadmin on your Raspberry Pi 4 server? I like being able to administer my home Minecraft server remotely via a website. Or is there something else you would recommend?

    1. jamesachambers

      I honestly haven’t tried MCMyAdmin specifically, but remote management capabilities are something I’m considering in the future to add in depending on interest.

  14. Hey James,
    thank you a lot for doing this! I followed your tutorial and its running like a charm! I got myself a raspberry pi 4 with 4GB of Ram. I set the RAM for the server to 2000MB for now, but I would like to know how to change that. I havn’t found any line of code, which could be connected to the RAM.
    I set the RAM while setting up the server for the first time – do I have to do that again, if I want to raise the RAM?`

    Another quick question:
    I’ve got a pretty slow Internet Connection and when I am starting the Server its talking a “long” time to get to 100%. Is this coming from my internet connection or is this a normal thing?

    Thanks in advance!

    Best regards,
    Fabian :3

    1. jamesachambers

      Hey Fabian, glad to hear it helped!

      To set the server RAM again you can run the Setup script again or just edit start.sh’s very bottom line with nano start.sh.

      Close the server, then cd ~/minecraft and type nano start.sh. Go to the very bottom line:

      screen -dmS minecraft java -jar -Xms400M -Xmx1500M /home/pi/minecraft/paperclip.jar

      Change the Xmx1500M to the amount of megabytes you want to allocate to the server. Now start the server back up!

  15. Hey James,
    first of all thanks for sharing you knowledge and work! Especially with your script and detailled information you make it super easy for us guys. I appriciate that.
    Anyway, I run across two problems. Here’s my setup: Server is hostes on my RPi 2B+. Game is played on my RPi 3B+.

    First problem: The server installed with your script is 1.13.2 and I think at the moment 1.12.1 ist the latest running client on my Pi 3. I see two options.
    Option 1: Using your “outdated” manual installation guide to install an older server version. And since in the future I’ll have to wait for people to get the latest MC version running on the Pi, I guess that’s my best option to go for and not beeing dependent on scripts.
    Option 2: Simply getting the 1.13.2 MC client running on my Pi 3.
    Probably I can fix this problem by myself, but some tips are welcome.

    THE REAL PROBLEM: Shortly after starting the server and everything is loaded, I get a bunch of red error lines in the screen window. And even though it states that “THIS IS NOT A BUG OR A CRASH”, none of my friends are able to connect to the server. The error lines are like app//com.majong.datafixers…, java.base@9-Raspbian/java.util…, app//org.bukkit.craftbuild…, app//net.minecraft.server.v1_13_R2…, etc.
    I don’t even know what that means and by consequence how to fix it.
    Can anyone help??

    1. Hello Sahin,

      I think I can help! The Paper Minecraft server still supports the 1.12.2 branch. My understanding is that 1.13 introduced the new version of LWJGL that hasn’t been ported to ARM yet so if you can upgrade to 1.12.2 there are still supported versions of the server. Check out this link for the downloads: https://papermc.io/downloads#Paper-1.12. You can still use all of the current scripts, you will just replace paperclip.jar with the one from the linked site. Here’s a link of the guy running 1.12.2 on RPI: https://www.raspberrypi.org/forums/viewtopic.php?t=208027

      Now to address the real problem section. A couple of things: Is this a brand new server or is this your 1.12 server now running on the 1.13 server? There are some version compatibility issues between the two. It would also help to see the full error message. There’s actually some useful info buried in the 20+ lines it spits out every time it has an error so pasting a full copy would help as well. From what you posted I see a DataFixer exception. The DataFixer class is the class that helps manage data between different Minecraft versions which would point to my original theory.

      If you go the 1.12.2 route then it would be best to load up a backup from before the 1.13 server ever touched it as moving forward is difficult enough and moving backward is impossible once 1.13.2 put its own data structures in there. Let me know what you think and if this is a new or existing server and paste in some samples of the full error and we should be able to get it straightened!

  16. okay so i have followed your step by step instruction in this page. i have minecraft on my android phone but i’m unable to connect to world. I feel like i’m missing something? i’m a complete NOOB when i comes to this. would like to get this going for my kids who play minecraft on there phones. Please help

  17. Hey James (I’m migrating from your I/O Optimization post!)

    Great guide here as well. I have the exact same setup with the SanDisk Extreme Pro USB Flash Drive and it works well most of the time!

    I am however getting really random performance dips where the server will have a consistent 4-6 second lag that last anywhere from a minute to several hours. I’ve tested the server with just myself and upwards of 7 people now and regardless of the number of players the performance variation remains.

    We’re all loving it, but I’d really be happy if I could squash out these hiccups and get a nice smooth sailing experience. I just wanted to know what kind of optimizations you’ve done outside of what’s written in your post?

    I am using just the regular server.jar that mojang has to download and not the paperclip, so I don’t have the spiggot or bukkit configuration files. I tried using paperclip for a period of time but it was just giving some of the same issues. I make sure to utilize some java flags like setting the memory usage to 800M.

    I have skepticism about thermal throttling of the R.pi, mine get’s pretty hot. I have heatsinks on the two main chips but that’s about it. I also wonder if it could maybe be a networking thing? However, whenever I host the server with the same settings on a stronger desktop on the same network I’m seeing the issues go away. Did you tweak anything in either of these areas to optimize performance?

    Would love to hear what you have to say, keeping the R.pi as a permanent server setup is a dream!

    1. jamesachambers

      Hey Zaner,

      The main things outside my original post depend on what kind of server you are running and what you want to do. The most important thing to do first is figure out what is slowing down the server. Have you ran the timings tool on the server to determine where the spikes are and what the server is doing when they occur?

      Some examples of optimizations I’d do: monster/animal view and action distance can be lowered in a lot of situations, lowering the view distance in the game can help with block chunking I/O issues, pregenerating the map in MCEdit can help if block reads/saves are slowing you down, reducing save timers can help if it’s getting stuck while autosaving various parts of the game by making them less frequent, etc.

      I could definitely assist if you posted a link to your timing results.

      For heat throttling affecting your performance this is definitely a possibility. The Raspberry Pi will downclock itself around 85C. Further, running very hot is a known problem with the Raspberry Pi 3. Check out this article to see some of the best info on this: https://makezine.com/2016/03/02/raspberry-pi-3-not-halt-catch-fire/
      Have you taken measurements as to what temperature your Pi is reporting?

      In this article I used a Pi 3B+ which came with the little heatsinks installed and didn’t do any additional tweaks regarding heat. If you’re running without the heatsinks this is where I would start. A few degrees being pulled off the chips by the heatsink may make all the difference in stabilizing the board’s performance and they only cost around 5 bucks from Amazon for the whole kit (get one with good reviews, the super cheap ones don’t conduct very well).

      Also check out this article where I use a fan to provide direct cooling to a RPI: https://jamesachambers.com/old-skool-nes-classic-case-fan-mod/
      Although you aren’t running RetroPie on the box we may find via your temperature readings that you are hitting temperatures where you may need to provide some active cooling. This little fan powered by the RPI itself is pretty nifty but you can also just put a normal desk fan right over the Pi to pull heat off it (especially with the heatsink kits).

      -James

  18. I got the fast 32 GB SD card and followed the directions. I get the Pi to launch but I can’t connect. I “think” I have port forwarding correctly setup on my router. The question that hits is how do I know? How do I check? I don’t know if it is my work or a version incompatibility with Minecraft on my family’s iPads and my laptop. Any thoughts would be appreciated.

    1. jamesachambers

      It sounds like you are using the Minecraft Bedrock edition (which is the one that comes with Windows and the available version for iPad).

      This server is for the Java edition available at Mojang.com.

    1. jamesachambers

      The Paper server project is built on top of Spigot which has had a 1.13 server up for testing publicly for months now. I expect support for 1.13-pre1 to come to Paper very soon.

  19. You list a “SanDisk Extreme 128GB Solid State Flash Drive” but I don’t see anything that explains why or how to use that. I’m assuming it’s in place of the MicroSD card

    1. jamesachambers

      Sorry about the lack of clarification there. I will update that section to clarify. You are correct in that I am suggesting using a solid state based flash drive over a MicroSD card. Check out this article to see why.

      In a nutshell, solid state with the Pi outperforms even the most expensive MicroSD cards by a huge margin. Even cheap based makeshift drives (also described in linked article) maxed out the bus in a way that MicroSD can’t. Since Minecraft is very I/O intensive with constant chunk generation and loading having fast storage is critical for good performance.

  20. Thanks for this post, it is the most comprehensive tutorial I have found about creating a minecraft server on rbpi 3.

  21. How do I load a minecraft save into the world? every time i copy the contents of another world into ‘world’, it just gives me errors about session.lock

    1. jamesachambers

      Make sure that you have the server closed when you are trying to copy your world over and then start the server afterward. The server creates a session.lock file when it is running.

        1. jamesachambers

          Yes. If you are certain that the server is closed and there is a stale session.lock file then it should be safe to delete it and start the server.

          Check out this link from the Minecraft wiki about session.lock. It is meant to make sure that the last program the accessed the world continues to be the only program that can access it. Since you are moving the server over, this behavior is not desired and it is safe to delete the session.lock. When the server runs it will create a new one saying your Pi server now owns the world. If you transferred the world again in the future back to a different platform you would delete the session.lock again to release the world.

          If you have further trouble you can chmod 777 world or session.lock. See this answer if just sudo rm session.lock inside the world folder doesn’t work for you.

  22. When I do the command “./start.sh” without the quotes this is what is returned

    Starting Minecraft server. To view window type screen -r minecraft.
    To minimize the window and let the server run in the background, press Ctrl+A then Ctrl+D
    ./start.sh: line 6: screen: command not found

    How can I fix this?

    1. jamesachambers

      The best way is using a system service as a daemon. I will make a post on how to do this as I have been creating daemons for other things I have been working on.

    1. jamesachambers

      I’d recommend around 700-800MB. This leaves room for the base services on the Pi to still run. If you push the base services into the swap it can cause the Pi to crash or slow down dramatically.

      If you disable some services on the Pi it can definitely free up a small amount of room to squeeze out a little more but 800MB is pretty sufficient. You can experiment with higher and see if the Pi can handle it but I’d start at 700 and work up from there.

  23. What would you recommend for the max number of players for the Raspberry Pi 3 B+? I currently just have the Raspberry Pi 3 and I have the max players set for 8 with seems to work quite well. I was wanting to upgrade it to the B+.

    1. jamesachambers

      I have heard of people getting 12 players on there quite comfortably on the 3B+. I would start there and slowly add and see how the server is running. Definitely monitor the timings and see if you are having any problematic areas on the server that may be leading up to lag.

  24. Thanks for the tutorial ! The controls works on Asus Tinker Board? And 16GB SD is enough for the minecraft server and the bone?

    1. jamesachambers

      Absolutely. I haven’t picked up an ASUS Tinker Board yet but as long as they have a java9 or java8 JDK package it should work just fine. 16GB is also plenty of memory!

      -James

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