Minecraft server SPIGOT on Ubuntu 20.04 with OpenJDK 11/16/17
NOW works with Minecraft 1.18
Need -e SPIGOT_VER=1.18 to build because spigot still consider 1.17 as last stable version.
This is a major change in logic to build the correct version of spigot so some combination of conditions may not compile correctly. Please make an issue so I can correct it. There will be another build shortly with another feature
Java bug on version 1.17 with 1 core add -e OTHER_JAVA_OPTS=-Djava.util.concurrent.ForkJoinPool.common.parallelism=1 as workaround
This docker image builds and runs the spigot version of minecraft.
If the spigot.jar is not found in the minecraft directory the system pulls down BuildTool and build a new spigot.jar from the latest released minecraft.jar
Each time the container is started the presence of the file /minecraft/spigot.jar, if the file is missing a build of spigot.jar is started.
The spigot daemon is started with superovisord, see my Ubuntu container for a more detailed description of my implementation of an init-process in ubuntu, see nimmis/ubuntu
Whats new is
- possibillity to change spigot versions i running containers
- Detects version if mc-directory already has a precompiled version active
- Adjust java version depending of MC version, downloads additional java version if needed
- Support for Minecraft version 1.18
Why not a precompiled version of spigot is included
Due to legal reasons you can build it yourself but you can't redistribute the finished jar file.
Starting the container
To run the latest stable version of this docker image run
docker run -d -p 25565:25565 -e EULA=true nimmis/spigot
the parameter
-e EULA=true
The is because Mojang now requires the end user to access their EULA, located at https://account.mojang.com/documents/minecraft_eula, the be able to start the server.
the parameter
-p 25565:25565
tell on witch external port the internal 25565 should be connected, in this case the same, if you only type -p 25565 it will connect to a random port on the machine
Giving the container a name
To make it easier to handle you container you can give it a name instead of the long number thats normally give to it, add a
--name spigot
to the run command to give it the name minecraft, then you can start it easier with
docker start spigot
docker stop spigot
First time run
This will take a couple of minutes depending on computer and network speed. It will pull down the selected version on BuildTools and build a spigot.jar from the selected minecraft version. This is done in numerous steps so be patient.
you can follow the output from the compilation with then command (assume that you given the container the name spigot)
docker logs -f spigot
*** open logfile
*** Run files in /etc/my_runonce/
*** Running /etc/my_runonce/00_dump_info.sh...
Build of nimmis/spigot:latest, date: 2021-12-06T12:54:26Z
Build of nimmis/ubuntu:20.04, date: 2021-07-04T09:06:36Z
*** Running /etc/my_runonce/50_set_timezone...
timezone not set, trying to autodetect
external ip is 95.192.***.***
timezone should be Europe/Stockholm
setting timezone to Europe/Stockholm
*** Running /etc/my_runonce/90_autorestart...
*** Run files in /etc/my_runalways/
*** Running /etc/my_runalways/00_minecraft_owner...
missmatch between directory owner and minecraft user
Changed owner of minecraft to UID 0
*** Running /etc/my_runalways/10_set_mc_version...
*** Running /etc/my_runalways/50_do_build_spigot...
checking 1.18
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 135k 100 135k 0 0 436k 0 --:--:-- --:--:-- --:--:-- 434k
Setting version to 1.18
set java version to 17
Building spigot version (1.18) jar file, be patient
Then the compilation is completed the server will start and you will see something like
Success! Everything completed successfully. Copying final .jar files now.
Copying spigot-1.18-R0.1-SNAPSHOT-bootstrap.jar to /build-mc/./spigot-1.18.jar
Saved as ./spigot-1.18.jar
Successfull build of spigot version 1.18
Setting 1.18 as current spigot version
*** Running /etc/my_runalways/85_fix_startsh...
start.sh missing, creating link for /minecraft/start.sh
*** Running /etc/my_runalways/90_eula...
*** Booting supervisor daemon...
*** Supervisor started as PID 781
*** Started processes via Supervisor......
crond RUNNING pid 783, uptime 0:00:04
spigot RUNNING pid 784, uptime 0:00:04
syslog-ng RUNNING pid 785, uptime 0:00:03
you can then exit from the log with CTRL-C
Selecting version to compile
You can now change the minecraft version after you started the container the first time.
defining version on first start
If you don't specify this parameter it will check the minecraft directory in the container to see if there is a previous compiled version linked. If so the container will use that version.
If no version of spigot is linked (like first time) it will always compile the latest version but if you want a specific version you can specify it by adding
-e SPIGOT_VER=<version>
where is the version you would like to use, to build it with version 1.18 add
-e SPIGOT_VER=1.18
to the docker run line.
change version in a running container
There is a command to change minecraft version in a running container
docker exec -it spigot set_mc_ver <version>
when the command is executed it will check if there is a compiled version already in the minecrafte folder, if not it will build it.
It first stops the running mincraft, change java version if needed (download if missing), compile a new spigot if needed and then start minecraft again.
It is not recomended to downgrade version as the world-information is not backwards compaible.
versions available
Please check the web page for BuildTools to get the latest information.
setup memory to use
There are two environment variables to set maximum and initial memory for spigot.
MC_MAXMEM
Sets the maximum memory to use m for Mb or g for Gb, if this parameter is not set 1 Gb is chosen, to set the maximum memory to 2 Gb
-e MC_MAXMEM=2g
MC_MINMEM
sets the initial memory reservation used, use m for Mb or g for Gb, if this parameter is not set, it is set to MC_MAXMEM, to set the initial size t0 512 Mb
-e MC_MINMEM=512m
SPIGOT_AUTORESTART
This variable controlls the behavior of the container when the stop command is issued inside minecraft
-e SPIGOT_AUTORESTART=yes
Which is the default behavior and does not need to be specified, the minecraft server will autostart if the stop command is issued.
-e SPIGOT_AUTORESTART=no
If the stop command is issued the minecraft server will stay down until the container is restarted or the command mc_start is issued
OTHER_JAVA_OPS
Allows to add other Java options when starting minecraft
-e OTHER_JAVA_OPS=
look at the last output from the spigot server
To get an output of the latest events from the spigot server type
docker exec spigot mc_log
and you will see the last 10 lines from the output, this is what you will see after startup
Abort with CTRL-C
[13:02:15 INFO]: Zombie Aggressive Towards Villager: true
[13:02:15 INFO]: Experience Merge Radius: 3.0
[13:02:15 INFO]: Preparing start region for level 0 (Seed: 506255305130990210)
[13:02:16 INFO]: Preparing spawn area: 22%
[13:02:17 INFO]: Preparing spawn area: 99%
[13:02:17 INFO]: Preparing start region for level 1 (Seed: 506255305130990210)
[13:02:18 INFO]: Preparing spawn area: 95%
[13:02:18 INFO]: Preparing start region for level 2 (Seed: 506255305130990210)
[13:02:18 INFO]: Server permissions file permissions.yml is empty, ignoring it
[13:02:18 INFO]: Done (3.650s)! For help, type "help" or "?"
It will continue to output everything from the console until you press CTRL-C
sending commands to the server console
You don't need to have an interactive container to be able to send commands to the console. To send a command to set the time to day you type
docker exec spigot mc_send "time set day"
If this was the first command issued after a start the output should look like
[13:02:15 INFO]: Zombie Aggressive Towards Villager: true
[13:02:15 INFO]: Experience Merge Radius: 3.0
[13:02:15 INFO]: Preparing start region for level 0 (Seed: 506255305130990210)
[13:02:16 INFO]: Preparing spawn area: 22%
[13:02:17 INFO]: Preparing spawn area: 99%
[13:02:17 INFO]: Preparing start region for level 1 (Seed: 506255305130990210)
[13:02:18 INFO]: Preparing spawn area: 95%
[13:02:18 INFO]: Preparing start region for level 2 (Seed: 506255305130990210)
[13:02:18 INFO]: Server permissions file permissions.yml is empty, ignoring it
[13:02:18 INFO]: Done (3.650s)! For help, type "help" or "?"
[13:12:35 INFO]: Set the time to 1000
It will continue to output everything from the console until you press CTRL-C
using the minecraft op command
To make yourself operator in the game use mc_send command, for example give the user myuser op use the command.
docker exec spigot mc_send op myuser
using the minecraft stop command
Default the minecraft server will automatically restart on a stop inside the minecraft application. You can override this behavior by using
-e SPIGOT_AUTORESTART=no
This will prevent the server to restart and minecraft has to be started again with the mc_start command
starting and stopping the server
To stop the server but not the container do
docker exec spigot mc_stop
To start it after being stopped do
docker exec spigot mc_start
Finally to restart it do
docker exec spigot mc_restart
stopping the container
When the container is stopped with the command
docker stop spigot
the spigot server is shutdown nicely with a console stop command to give it time to save everything before stopping the container. If you look in the output from the server this show
[13:01:51 INFO]: Stopping the server
[13:01:51 INFO]: Stopping server
[13:01:51 INFO]: Saving players
[13:01:51 INFO]: nimmis lost connection: Server closed
[13:01:51 INFO]: nimmis left the game.
[13:01:51 INFO]: Saving worlds
[13:01:51 INFO]: Saving chunks for level 'world'/Overworld
[13:01:51 INFO]: Saving chunks for level 'world_nether'/Nether
[13:01:51 INFO]: Saving chunks for level 'world_the_end'/The End
Having the minecraft files on the host machine
If you delete the container all your filer in minecraft will be gone. To save them where it's easier to edit and do a backup of the files you can attach a directory from the host machine (where you run the docker command) and attach it to the local file system in the container. The syntax for it is
-v /host/path/to/dir:/container/path/to/dir
To attach the minecraft directory in the container to directory /home/nimmis/mc-srv you add
-v /home/nimmis/mc-srv:/minecraft
problems with external mounted volumes
When a external volume is mounted the UID of the owner of the volume may not match the UID of the minecraft user (1000). This can result in problems with write/read access to the files.
To address this problem a check is done between UID of the owner of /minecraft and the UID of the user minecraft. If there is a mismatch the UID of the minecraft user is changed to match the UID of the directory.
If you don't want to do this and want to manually set the UID of the minecraft user there is a variable named SPIGOT_UID which defines the minecraft user UID, adding
-e SPIGOT_UID=1132
sets the minecraft user UID to 1132.
Other commands available to container
The syntax is
docker exec -ti <spigot container name> <command> <paramaters>
command: get_mc_versions
If you get minecraft version not found and it is a version released after to started the container the first time. You need to update the list of available versions, do
docker exec -it <spigotverson> get_mc_versions
and you should get an output simular to
docker exec -it spigot get_mc_versions
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 135k 100 135k 0 0 498k 0 --:--:-- --:--:-- --:--:-- 498k
and the versionlist is updated.
Old versions news
- Updated java version to 17 which is a LTS version
- Adopt moved to Eclipe Foundation and changed name to Adoptium
- Updated java version to 16 to compile minecraft 1.17
- Switched to Adopt OpenJDK
- Fix for problem introduced during fall of 2017 for both Windows 10 and MacOS versions of docker, failed to build new versions of spigot
- Autodetection of timezone if container has access to internet
- adjust minecraft user UID to match mounted volume
- selectable memory size for the Java process
- selectable spigot version
- do a nice shutdown of the server when the docker stop command is issued
- docker accessible commands to
- start/stop/restart the spigot server
- send console commands to the server
- look at console output from the server
Issues
If you have any problems with or questions about this image, please contact us by submitting a ticket through a GitHub issue
- Look to see if someone already filled the bug, if not add a new one.
- Add a good title and description with the following information.
- if possible an copy of the output from cat /etc/BUILDS/* from inside the container
- any logs relevant for the problem
- how the container was started (flags, environment variables, mounted volumes etc)
- any other information that can be helpful
Contributing
You are invited to contribute new features, fixes, or updates, large or small; we are always thrilled to receive pull requests, and do our best to process them as fast as we can.
Future features
- automatic backup
- plugins
- more....