Update flags as of 5/2/2020 (#534)

For #476

Dockerfile

@@ -21,8 +21,8 @@ HEALTHCHECK --start-period=1m CMD mc-monitor status --host localhost --port $SER
 
 RUN addgroup -g 1000 minecraft \
   && adduser -Ss /bin/false -u 1000 -G minecraft -h /home/minecraft minecraft \
-  && mkdir -m 777 /data /mods /config /plugins \
+  && mkdir -m 777 /data \
-  && chown minecraft:minecraft /data /config /mods /plugins /home/minecraft
+  && chown minecraft:minecraft /data /home/minecraft
 
 EXPOSE 25565 25575
 
@@ -49,7 +49,7 @@ RUN easy-add --var os=${TARGETOS} --var arch=${TARGETARCH}${TARGETVARIANT} \
  --from https://github.com/itzg/{{.app}}/releases/download/{{.version}}/{{.app}}_{{.version}}_{{.os}}_{{.arch}}.tar.gz
 
 RUN easy-add --var os=${TARGETOS} --var arch=${TARGETARCH}${TARGETVARIANT} \
- --var version=1.4.2 --var app=mc-server-runner --file {{.app}} \
+ --var version=1.4.3 --var app=mc-server-runner --file {{.app}} \
  --from https://github.com/itzg/{{.app}}/releases/download/{{.version}}/{{.app}}_{{.version}}_{{.os}}_{{.arch}}.tar.gz
 
 RUN easy-add --var os=${TARGETOS} --var arch=${TARGETARCH}${TARGETVARIANT} \
@@ -69,8 +69,7 @@ ENV UID=1000 GID=1000 \
   JVM_XX_OPTS="-XX:+UseG1GC" MEMORY="1G" \
   TYPE=VANILLA VERSION=LATEST FORGEVERSION=RECOMMENDED SPONGEBRANCH=STABLE SPONGEVERSION= FABRICVERSION=LATEST LEVEL=world \
   PVP=true DIFFICULTY=easy ENABLE_RCON=true RCON_PORT=25575 RCON_PASSWORD=minecraft \
-  RESOURCE_PACK= RESOURCE_PACK_SHA1= \
+  LEVEL_TYPE=DEFAULT SERVER_PORT=25565 ONLINE_MODE=TRUE SERVER_NAME="Dedicated Server" \
-  LEVEL_TYPE=DEFAULT GENERATOR_SETTINGS= WORLD= MODPACK= MODS= SERVER_PORT=25565 ONLINE_MODE=TRUE CONSOLE=true SERVER_NAME="Dedicated Server" \
   REPLACE_ENV_VARIABLES="FALSE" ENV_VARIABLE_PREFIX="CFG_"
 
 COPY start* /

README.md

@@ -93,6 +93,24 @@ such as
 
         docker run -d -it -e EULA=TRUE -p 25565:25565 --name mc itzg/minecraft-server
 
+## Timezone Configuration
+
+You can configure the timezone to match yours by setting the `TZ` environment variable:
+
+        -e TZ=Europe/London
+
+such as:
+
+        docker run -d -it -e TZ=Europe/London -p 25565:25565 --name mc itzg/minecraft-server
+
+Or mounting `/etc/timezone` as readonly (not supported on Windows):
+
+        -v /etc/timezone:/etc/timezone:ro
+
+such as:
+
+        docker run -d -it -v /etc/timezone:/etc/timezone:ro -p 25565:25565 --name mc itzg/minecraft-server
+
 ## Attaching data directory to host filesystem
 
 In order to readily access the Minecraft data, use the `-v` argument
@@ -259,6 +277,8 @@ Optionally you can also define a prefix to only match predefined enviroment vari
 
 `ENV_VARIABLE_PREFIX="CFG_"` <-- this is the default prefix
 
+If you want use file for value (like when use secrets) you can add suffix `_FILE` to your variable name (in  run command).
+
 There are some limitations to what characters you can use.
 
 | Type  | Allowed Characters  |
@@ -305,7 +325,7 @@ services:
       # and here are the actual variables
       CFG_DB_HOST: "http://localhost:3306"
       CFG_DB_NAME: "minecraft"
-      CFG_DB_PASSWORD: "ug23u3bg39o-ogADSs"
+      CFG_DB_PASSWORD_FILE: "/run/secrets/db_password"
     restart: always
   rcon:
     image: itzg/rcon
@@ -318,8 +338,16 @@ services:
 volumes:
   mc:
   rcon:
+
+secrets:
+  db_password:
+    file: ./db_password
 ```
 
+The content of `db_password`:
+
+    ug23u3bg39o-ogADSs
+
 ## Running a Bukkit/Spigot server
 
 Enable Bukkit/Spigot server mode by adding a `-e TYPE=BUKKIT -e VERSION=1.8` or `-e TYPE=SPIGOT -e VERSION=1.8` to your command-line.
@@ -386,6 +414,9 @@ in either persistent volumes or a downloadable archive.
 
 Enable PaperSpigot server mode by adding a `-e TYPE=PAPER -e VERSION=1.9.4` to your command-line.
 
+By default the container will run the latest build of [Paper server](https://papermc.io/downloads)
+but you can also choose to run a specific build with `-e PAPERBUILD=205`.
+
     docker run -d -v /path/on/host:/data \
         -e TYPE=PAPER -e VERSION=1.9.4 \
         -p 25565:25565 -e EULA=TRUE --name mc itzg/minecraft-server
@@ -444,6 +475,22 @@ This works well if you want to have a common set of plugins in a separate
 location, but still have multiple worlds with different server requirements
 in either persistent volumes or a downloadable archive.
 
+## Running a Tuinity server
+
+A [Tuinity](https://github.com/Spottedleaf/Tuinity) server, which is a fork of Paper aimed at improving server performance at high playercounts.
+
+    -e TYPE=TUINITY
+
+> **NOTE** only `VERSION=LATEST` is supported
+
+## Running a Magma server
+
+A [Magma](https://magmafoundation.org/) server, which is a combination of Forge and PaperMC, can be used with
+
+    -e TYPE=MAGMA
+
+> **NOTE** there are limited base versions supported, so you will also need to  set `VERSION`, such as "1.12.2"
+
 ## Running a Server with a Feed-The-Beast (FTB) / CurseForge modpack
 
 Enable this server mode by adding a `-e TYPE=FTB` or `-e TYPE=CURSEFORGE` to your command-line,
@@ -451,8 +498,8 @@ but note the following additional steps needed...
 
 You need to specify a modpack to run, using the `FTB_SERVER_MOD` or `CF_SERVER_MOD` environment
 variable. An FTB/CurseForge server modpack is available together with its respective
-client modpack on https://www.feed-the-beast.com under "Additional Files." Similar you can
+client modpack on <https://www.feed-the-beast.com> under "Additional Files." Similar you can
-locate the modpacks for CurseForge at https://www.curseforge.com/minecraft/modpacks .
+locate the modpacks for CurseForge at <https://www.curseforge.com/minecraft/modpacks> .
 
 Now you can add a `-e FTB_SERVER_MOD=name_of_modpack.zip` to your command-line.
 
@@ -460,7 +507,7 @@ Now you can add a `-e FTB_SERVER_MOD=name_of_modpack.zip` to your command-line.
         -e FTB_SERVER_MOD=FTBPresentsSkyfactory3Server_3.0.6.zip \
         -p 25565:25565 -e EULA=TRUE --name mc itzg/minecraft-server
 
-If you don't want to keep the pre-download modpacks separate from your data directory,
+If you want to keep the pre-download modpacks separate from your data directory,
 then you can attach another volume at a path of your choosing and reference that.
 The following example uses `/modpacks` as the container path as the pre-download area:
 
@@ -490,7 +537,7 @@ To use these packs you will need to:
 - Specify the manifest location with env var `MANIFEST=/data/FeedTheBeast/manifest`
 - Pick a relevant ServerStart.sh and potentially settings.cfg and put them in `/data/FeedTheBeast`
 
-An example of the latter would be to use https://github.com/AllTheMods/Server-Scripts
+An example of the latter would be to use <https://github.com/AllTheMods/Server-Scripts>
 There, you'll find that all you have to do is put `ServerStart.sh` and `settings.cfg` into
 `/data/FeedTheBeast`, taking care to update `settings.cfg` to specify your desired version
 of minecraft and forge. You can do this in the cli with something like:
@@ -987,6 +1034,12 @@ Allows users to use flight on your server while in Survival mode, if they have a
 
     -e ALLOW_FLIGHT=TRUE|FALSE
 
+### Other server property mappings
+
+Environment Variable | Server Property
+---------------------|-----------------
+PLAYER_IDLE_TIMEOUT  | player-idle-timeout
+
 ## Miscellaneous Options
 
 ### Running as alternate user/group ID

build-multiarch.sh

@@ -0,0 +1,34 @@
+#!/bin/bash
+
+# manually purge any pre-existing manifest list
+# since docker manifest command lacks a "remove" operation
+rm -rf ~/.docker/manifests/docker.io_itzg_minecraft-server-multiarch
+
+export DOCKER_BUILDKIT=1
+
+docker build --platform linux/arm64 -t itzg/minecraft-server:arm64 .
+docker push itzg/minecraft-server:arm64
+
+armv7tag=armv7-buildkit
+armv7workDir=/tmp/armv7-$$
+git worktree add $armv7workDir armv7
+# sub-shell for build of armv7
+(
+  cd $armv7workDir
+  docker build --platform linux/arm/v7 -t itzg/minecraft-server:$armv7tag .
+  docker push itzg/minecraft-server:$armv7tag
+)
+git worktree remove $armv7workDir
+
+docker pull itzg/minecraft-server
+# use the rpi build one for now since armv7-buildkit is giving ABI mismatch on curl
+docker pull itzg/minecraft-server:armv7
+
+docker manifest create itzg/minecraft-server:multiarch \
+  itzg/minecraft-server \
+  itzg/minecraft-server:armv7 \
+  itzg/minecraft-server:arm64
+
+docker manifest inspect itzg/minecraft-server:multiarch
+
+docker manifest push -p itzg/minecraft-server:multiarch

examples/docker-compose-forge.yml

@@ -0,0 +1,23 @@
+version: "3.7"
+
+services:
+  mc:
+    image: itzg/minecraft-server
+    ports:
+    # expose the Minecraft server port outside of container
+    - 25565:25565
+    environment:
+      # REQUIRED for all types
+      EULA: "TRUE"
+      # Set server type (vs the default of vanilla)
+      TYPE: FORGE
+    volumes:
+    # use a named, managed volume for data volume
+    - mc_forge:/data
+    # attach local host directory "mods" in same directory as this compose file
+    # all mods in this directory get copied into /data/mods at startup
+    - ./mods:/mods:ro
+
+volumes:
+  # declared the named volume, but use default/local storage engine
+  mc_forge: {}

server.properties

@@ -22,6 +22,7 @@ snooper-enabled=true
 texture-pack=
 online-mode=true
 resource-pack=
+resource-pack-sha1=
 pvp=true
 difficulty=1
 enable-command-block=true

start-configuration

@@ -19,9 +19,9 @@ if [ ! -e /data/eula.txt ]; then
     exit 1
   fi
 
-  echo "# Generated via Docker on $(date)" > eula.txt
+  echo "# Generated via Docker on $(date)" > /data/eula.txt
 
-  if ! echo "eula=$EULA" >> eula.txt; then
+  if ! echo "eula=$EULA" >> /data/eula.txt; then
     log "ERROR: unable to write eula to /data. Please make sure attached directory is writable by uid=${UID}"
     exit 2
   fi
@@ -78,6 +78,10 @@ case "${TYPE^^}" in
     exec /start-deployPaper "$@"
   ;;
 
+  TUINITY)
+    exec /start-deployTuinity "$@"
+  ;;
+
   FORGE)
     exec /start-deployForge "$@"
   ;;
@@ -106,6 +110,10 @@ case "${TYPE^^}" in
     exec /start-validateCurseInstance "$@"
   ;;
 
+  MAGMA)
+    exec /start-magma "$@"
+  ;;
+
   *)
       log "Invalid type: '$TYPE'"
       log "Must be: VANILLA, FORGE, BUKKIT, SPIGOT, PAPER, FTB, CURSEFORGE, SPONGEVANILLA"

start-deployBukkitSpigot

@@ -5,6 +5,11 @@
 set -e
 
 function buildSpigotFromSource {
+  if [[ ${TYPE^^} = *BUKKIT ]] && ! versionLessThan "1.14"; then
+    log "ERR craftbukkit build is only supported for versions less than 1.14"
+    exit 1
+  fi
+
   log "Building Spigot $VANILLA_VERSION from source, might take a while, get some coffee"
   rm -rf /data/temp
   mkdir /data/temp
@@ -15,12 +20,24 @@ function buildSpigotFromSource {
   logn ''
   curl -sSL -o /data/temp/BuildTools.jar https://hub.spigotmc.org/jenkins/job/BuildTools/lastSuccessfulBuild/artifact/target/BuildTools.jar && \
     java $jvmOpts -jar /data/temp/BuildTools.jar --rev $VANILLA_VERSION 2>&1 |tee /data/spigot_build.log| while read l; do echo -n .; done; log "done"
-  if ! mv spigot-*.jar /data/spigot_server.jar; then
+
-    log "ERR failed to build Spigot"
+  case ${TYPE^^} in
-    cat /data/spigot_build.log
+    SPIGOT)
-    exit 1
+      if ! mv spigot-*.jar /data/${SERVER}; then
-  fi
+        log "ERR failed to build Spigot"
-  mv craftbukkit-*.jar /data/${SERVER}
+        cat /data/spigot_build.log
+        exit 1
+      fi
+      ;;
+    *BUKKIT)
+      if ! mv craftbukkit-*.jar /data/${SERVER}; then
+        log "ERR failed to build Spigot"
+        cat /data/spigot_build.log
+        exit 1
+      fi
+      ;;
+  esac
+
   log "Cleaning up"
   rm -rf /data/temp
   cd /data
@@ -57,6 +74,9 @@ ERROR: failed to download from $downloadUrl
 EOF
     exit 3
   fi
+
+  JVM_OPTS="${JVM_OPTS} -DIReallyKnowWhatIAmDoingISwear"
+  export JVM_OPTS
 }
 
 
@@ -70,7 +90,7 @@ case "$TYPE" in
 esac
 
 if [ ! -f $SERVER ] || [ -n "$FORCE_REDOWNLOAD" ]; then
-   if [[ "$BUILD_SPIGOT_FROM_SOURCE" = TRUE || "$BUILD_SPIGOT_FROM_SOURCE" = true || "$BUILD_FROM_SOURCE" = TRUE || "$BUILD_FROM_SOURCE" = true ]]; then
+   if isTrue "$BUILD_SPIGOT_FROM_SOURCE" || isTrue "$BUILD_FROM_SOURCE"; then
      buildSpigotFromSource
    else
      downloadSpigot
@@ -79,6 +99,7 @@ fi
 
 # Normalize on Spigot for operations below
 export TYPE=SPIGOT
+export SKIP_LOG4J_CONFIG=true
 
 # Continue to Final Setup
 exec /start-finalSetup01World $@

start-deployCustom

@@ -25,5 +25,7 @@ else
   exit 2
 fi
 
+export SKIP_LOG4J_CONFIG=true
+
 # Continue to Final Setup
 exec /start-finalSetup01World $@

start-deployFabric

@@ -29,7 +29,7 @@ elif [[ ! -e $FABRIC_INSTALLER ]]; then
   exit 2
 fi
 
-installMarker=".fabric-installed-${VANILLA_VERSION}-${FABRIC_VERSION:-manual}"
+installMarker="/data/.fabric-installed-${VANILLA_VERSION}-${FABRIC_VERSION:-manual}"
 
 debug Checking for installMarker ${installMarker}
 if [[ ! -e $installMarker ]]; then

start-deployForge

@@ -47,7 +47,7 @@ elif [[ ! -e $FORGE_INSTALLER ]]; then
   exit 2
 fi
 
-installMarker=".forge-installed-$shortForgeVersion"
+installMarker="/data/.forge-installed-$shortForgeVersion"
 
 if [ ! -e $installMarker ]; then
   if [ ! -e $FORGE_INSTALLER ]; then

start-deployPaper

@@ -2,10 +2,12 @@
 
 . /start-utils
 
-export SERVER=paper_server-${VANILLA_VERSION}.jar
+: ${PAPERBUILD:=latest}
+export SERVER=paper_server-${VANILLA_VERSION}-${PAPERBUILD}.jar
+
 if [ ! -f "$SERVER" ] || [ -n "$FORCE_REDOWNLOAD" ]; then
-    downloadUrl=${PAPER_DOWNLOAD_URL:-https://papermc.io/api/v1/paper/${VANILLA_VERSION}/latest/download}
+    downloadUrl=${PAPER_DOWNLOAD_URL:-https://papermc.io/api/v1/paper/${VANILLA_VERSION}/${PAPERBUILD}/download}
-    log "Downloading Paper $VANILLA_VERSION from $downloadUrl ..."
+    log "Downloading Paper $VANILLA_VERSION (build $PAPERBUILD) from $downloadUrl ..."
     curl -fsSL -o "$SERVER" "$downloadUrl"
     if [ ! -f "$SERVER" ]; then
       log "ERROR: failed to download from $downloadUrl (status=$?)"
@@ -15,6 +17,7 @@ fi
 
 # Normalize on Spigot for operations below
 export TYPE=SPIGOT
+export SKIP_LOG4J_CONFIG=true
 
 # Continue to Final Setup
 exec /start-finalSetup01World $@

start-deployTuinity

@@ -0,0 +1,27 @@
+#!/bin/bash
+
+. /start-utils
+
+if [ "${VERSION}" != "LATEST" ]; then
+  log "ERROR: Tunity server type only supports VERSION=LATEST"
+  exit 1
+fi
+
+: ${TUNITY_BUILD:=lastSuccessfulBuild}
+export SERVER=tunity-${VANILLA_VERSION}-${TUNITY_BUILD}.jar
+
+if [ ! -f "$SERVER" ] || [ -n "$FORCE_REDOWNLOAD" ]; then
+    downloadUrl="https://ci.codemc.io/job/Spottedleaf/job/Tuinity/${TUNITY_BUILD}/artifact/tuinity-paperclip.jar"
+    log "Downloading Tunity (build $TUNITY_BUILD) from $downloadUrl ..."
+    curl -fsSL -o "$SERVER" "$downloadUrl"
+    if [ ! -f "$SERVER" ]; then
+      log "ERROR: failed to download from $downloadUrl (status=$?)"
+      exit 3
+    fi
+fi
+
+# Normalize on Spigot for operations below
+export TYPE=SPIGOT
+
+# Continue to Final Setup
+exec /start-finalSetup01World $@

start-finalSetup04ServerProperties

@@ -76,20 +76,37 @@ function customizeServerProps {
   setServerProp "level-type" "${LEVEL_TYPE^^}"
   setServerProp "resource-pack" "$RESOURCE_PACK"
   setServerProp "resource-pack-sha1" "$RESOURCE_PACK_SHA1"
+  setServerProp "player-idle-timeout" "$PLAYER_IDLE_TIMEOUT"
 
   if [ -n "$DIFFICULTY" ]; then
     case $DIFFICULTY in
       peaceful|0)
-        DIFFICULTY=0
+        if versionLessThan 1.13; then
+          DIFFICULTY=0
+        else
+          DIFFICULTY=peaceful
+        fi
         ;;
       easy|1)
-        DIFFICULTY=1
+        if versionLessThan 1.13; then
+          DIFFICULTY=1
+        else
+          DIFFICULTY=easy
+        fi
         ;;
       normal|2)
-        DIFFICULTY=2
+        if versionLessThan 1.13; then
+          DIFFICULTY=2
+        else
+          DIFFICULTY=normal
+        fi
         ;;
       hard|3)
-        DIFFICULTY=3
+        if versionLessThan 1.13; then
+          DIFFICULTY=3
+        else
+          DIFFICULTY=hard
+        fi
         ;;
       *)
         log "DIFFICULTY must be peaceful, easy, normal, or hard."
@@ -103,19 +120,33 @@ function customizeServerProps {
     log "Setting mode"
     MODE_LC=$( echo $MODE | tr '[:upper:]' '[:lower:]' )
     case $MODE_LC in
-      0|1|2|3)
+      su*|0)
+        if versionLessThan 1.13; then
+          MODE=0
+        else
+          MODE=survival
+        fi
         ;;
-      su*)
+      c*|1)
-        MODE=0
+        if versionLessThan 1.13; then
+          MODE=1
+        else
+          MODE=creative
+        fi
         ;;
-      c*)
+      a*|2)
-        MODE=1
+        if versionLessThan 1.13; then
+          MODE=2
+        else
+          MODE=adventure
+        fi
         ;;
-      a*)
+      sp*|3)
-        MODE=2
+        if versionLessThan 1.13; then
-        ;;
+          MODE=3
-      sp*)
+        else
-        MODE=3
+          MODE=spectator
+        fi
         ;;
       *)
         log "ERROR: Invalid game mode: $MODE"

start-finalSetup05EnvVariables

@@ -10,6 +10,12 @@ if [ "${REPLACE_ENV_VARIABLES^^}" = "TRUE" ]; then
     if [[ "$name" = $ENV_VARIABLE_PREFIX* ]] \
         && [[ $value =~ ^[0-9a-zA-Z_:/=?.+\-]*$ ]] \
         && [[ $name =~ ^[0-9a-zA-Z_\-]*$ ]]; then
+      # Read content from file environment
+      if [[ $name = *"_FILE" ]] && [[ -f $value ]]; then
+        name="${name/_FILE/}"
+        value=$(<$value)
+      fi
+
       log "Replacing $name with $value ..."
       find /data/ -type f \
           \( -name "*.yml" -or -name "*.yaml" -or -name "*.txt" -or -name "*.cfg" \

start-magma

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+. /start-utils
+
+export SERVER="/data/magma-server-${VANILLA_VERSION}.jar"
+
+# Always download since new updates of each base version are published frequently
+if ! curl -o /data/magma-server-${VANILLA_VERSION}.jar -fsSL \
+  https://api.magmafoundation.org/api/resources/Magma/${VANILLA_VERSION}/stable/latest/download; then
+  log "ERROR unable to download version ${VANILLA_VERSION} of Magma"
+  log "      Check https://magmafoundation.org/ for available versions"
+  exit 1
+fi
+
+export SKIP_LOG4J_CONFIG=true
+
+# Continue to Final Setup
+exec /start-finalSetup01World $@

start-minecraftFinalSetup

@@ -4,14 +4,14 @@
 
 if [ -n "$OPS" ]; then
   log "Setting/adding ops"
-  rm -rf ops.txt.converted
+  rm -rf /data/ops.txt.converted
-  echo $OPS | awk -v RS=, '{print}' > ops.txt
+  echo $OPS | awk -v RS=, '{print}' > /data/ops.txt
 fi
 
 if [ -n "$WHITELIST" ]; then
   log "Setting whitelist"
-  rm -rf white-list.txt.converted
+  rm -rf /data/white-list.txt.converted
-  echo $WHITELIST | awk -v RS=, '{print}' > white-list.txt
+  echo $WHITELIST | awk -v RS=, '{print}' > /data/white-list.txt
 fi
 
 if [ -n "$ICON" -a ! -e server-icon.png ]; then
@@ -27,7 +27,7 @@ if [ -n "$ICON" -a ! -e server-icon.png ]; then
   fi
 fi
 
-if [ ${TYPE} != "SPIGOT" ]; then
+if ! isTrue ${SKIP_LOG4J_CONFIG}; then
 # Set up log configuration
 LOGFILE="/data/log4j2.xml"
 if [ ! -e "$LOGFILE" ]; then
@@ -41,7 +41,7 @@ fi
 
 # Make sure files exist and are valid JSON (for pre-1.12 to 1.12 upgrades)
 log "Checking for JSON files."
-JSON_FILES=$(find . -maxdepth 1 -name '*.json')
+JSON_FILES=$(find /data -maxdepth 1 -name '*.json')
 for j in $JSON_FILES; do
   if [[ $(cat "$j" | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//') == "" ]]; then
     log "Fixing JSON $j"
@@ -51,9 +51,9 @@ done
 
 
 # If any modules have been provided, copy them over
-mkdir -p /data/mods
 if [ -d /mods ]; then
   log "Copying any mods over..."
+  mkdir -p /data/mods
   rsync -a --out-format="update:%f:Last Modified %M" --prune-empty-dirs --update /mods /data
 fi
 
@@ -135,24 +135,25 @@ if isTrue "${USE_AIKAR_FLAGS}"; then
   fi
 
   JVM_XX_OPTS="${JVM_XX_OPTS}
-  -XX:+UseG1GC -XX:+ParallelRefProcEnabled
+  -XX:+UseG1GC
+  -XX:+ParallelRefProcEnabled
   -XX:MaxGCPauseMillis=200
   -XX:+UnlockExperimentalVMOptions
   -XX:+DisableExplicitGC
-  -XX:-OmitStackTraceInFastThrow
   -XX:+AlwaysPreTouch
   -XX:G1NewSizePercent=${G1NewSizePercent}
   -XX:G1MaxNewSizePercent=${G1MaxNewSizePercent}
   -XX:G1HeapRegionSize=${G1HeapRegionSize}
   -XX:G1ReservePercent=${G1ReservePercent}
   -XX:G1HeapWastePercent=5
-  -XX:G1MixedGCCountTarget=8
+  -XX:G1MixedGCCountTarget=4
   -XX:InitiatingHeapOccupancyPercent=${InitiatingHeapOccupancyPercent}
   -XX:G1MixedGCLiveThresholdPercent=90
   -XX:G1RSetUpdatingPauseTimePercent=5
   -XX:SurvivorRatio=32
+  -XX:+PerfDisableSharedMem
   -XX:MaxTenuringThreshold=1
-  -Dusing.aikars.flags=true
+  -Dusing.aikars.flags=https://mcflags.emc.gs
   -Daikars.new.flags=true
   "
 fi
@@ -163,6 +164,12 @@ if isTrue "${USE_LARGE_PAGES}"; then
   "
 fi
 
+if isTrue "${DEBUG_MEMORY}"; then
+  log "Memory usage and availability (in MB)"
+  uname -a
+  free -m
+fi
+
 mcServerRunnerArgs="--stop-duration 60s"
 if [[ ${TYPE} == "CURSE_INSTANCE" ]]; then
     JVM_OPTS="-Xms${INIT_MEMORY} -Xmx${MAX_MEMORY} ${JVM_OPTS}"

start-utils

@@ -71,6 +71,10 @@ function versionLessThan {
   local givenParts
   IFS=. read -ra givenParts <<< "$1"
 
+  if (( ${#activeParts[@]} < 2 )); then
+    return 1
+  fi
+
   if (( activeParts[0] < givenParts[0] )) || \
      (( activeParts[0] == givenParts[0] && activeParts[1] < givenParts[1] )); then
     return 0