Updated PaperMC config

minecraft/papermc/.env.example

@@ -1,25 +1,10 @@
-# Copyright (C) 2020 Jef Roosens
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-
 # Build arguments
 MC_VERSION=
 PAPERMC_VERSION=
 
 # Environment variables
-XMS=4
+# If XMS is left blank, it uses the same value as XMX
+XMS=
 XMX=4
 
 # Mount points

minecraft/papermc/Dockerfile

@@ -1,25 +1,16 @@
-# Copyright (C) 2020 Jef Roosens
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-
-FROM openjdk:8-slim
+FROM openjdk:11-jre-slim
 
 # Build arguments
 ARG MC_VERSION
 ARG PAPERMC_VERSION
 
+# Install mcstatus for healthchecks
+RUN apt update && \
+    apt install --no-install-recommends -y python3-minimal python3-setuptools python3-pip && \
+    python3 -m pip install mcstatus && \
+    apt --purge remove -y python3-pip python3-setuptools && \
+    apt clean
+
 # Create worlds and config directory
 WORKDIR /app
 RUN mkdir worlds config
@@ -30,7 +21,6 @@ ADD "https://papermc.io/api/v1/paper/$MC_VERSION/$PAPERMC_VERSION/download" serv
 # Store the cache in an anonymous volume, which means it won't get stored in the other volumes
 VOLUME /app/config/cache
 
-WORKDIR /app/config
 
 # Default value to keep users from eating up all ram accidentally
 ENV XMS=4
@@ -38,32 +28,10 @@ ENV XMS=4
 # Document exposed ports
 EXPOSE 25565
 
-# We copy over the server jar(s) as well to make the backup more reproducible to deploy
-ENTRYPOINT mv -n /app/*.jar /app/config && \
-echo "eula=true" > /app/config/eula.txt && \
-java \
--Xms"${XMS}G" \
--Xmx"${XMX:-$XMS}G" \
--XX:+UseG1GC \
--XX:+ParallelRefProcEnabled \
--XX:MaxGCPauseMillis=200 \
--XX:+UnlockExperimentalVMOptions \
--XX:+DisableExplicitGC \
--XX:+AlwaysPreTouch \
--XX:G1NewSizePercent="$([ $XMS -gt 12 ] && echo 40 || echo 30)" \
--XX:G1MaxNewSizePercent="$([ $XMS -gt 12 ] && echo 50 || echo 40)" \
--XX:G1HeapRegionSize="$([ $XMS -gt 12 ] && echo 16 || echo 8)"M \
--XX:G1ReservePercent="$([ $XMS -gt 12 ] && echo 15 || echo 20)" \
--XX:G1HeapWastePercent=5 \
--XX:G1MixedGCCountTarget=4 \
--XX:InitiatingHeapOccupancyPercent="$([ $XMS -gt 12 ] && echo 20 || echo 15)" \
--XX:G1MixedGCLiveThresholdPercent=90 \
--XX:G1RSetUpdatingPauseTimePercent=5 \
--XX:SurvivorRatio=32 \
--XX:+PerfDisableSharedMem \
--XX:MaxTenuringThreshold=1 \
--Dusing.aikars.flags=https://mcflags.emc.gs \
--Daikars.new.flags=true \
--jar /app/server.jar \
---universe /app/worlds \
---nogui
+# Entrypoint runs in /app/config
+COPY entrypoint.sh /entrypoint.sh
+WORKDIR /app/config
+ENTRYPOINT /entrypoint.sh
+
+HEALTHCHECK --interval=30s --timeout=5s --start-period=15s --retries=3 \
+    CMD mcstatus localhost:25565 ping

minecraft/papermc/docker-compose.yml

@@ -16,7 +16,7 @@
 
 version: '3.5'
 services:
-    papermc:
+    app:
         build:
             context: .
             args:
@@ -38,6 +38,7 @@ services:
             - '$CONFIG_DIR:/app/config'
             - '$WORLDS_DIR:/app/worlds'
 
+# These volumes only get created if you use them in the env file
 volumes:
     config:
     worlds: