improve minecraft performance by using a non nfs volume for live data

apps/minecraft/rsync.configmap.yaml

@@ -0,0 +1,42 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: rsync-config
+data:
+  run-rsync.sh: |-
+    #!/bin/sh
+    set -eu
+    echo "Starting rsync..."
+
+    no_change_count=0
+
+    while [ "$no_change_count" -lt 3 ]; do
+      # use the i flag to get per line output of each change
+      rsync_output=$(rsync -avzi --delete /local-data/ /persistent-data/)
+      # echo "$rsync_output"
+
+      # in this format rsync outputs at least 4 lines:
+      # ---
+      # sending incremental file list
+      #
+      # sent 145,483 bytes  received 717 bytes  26,581.82 bytes/sec
+      # total size is 708,682,765  speedup is 4,847.35
+      # ---
+      # even though a non-zero number of bytes is sent, no changes were made
+
+      line_count=$(echo "$rsync_output" | wc -l)
+
+      if [ "$line_count" -eq 4 ]; then
+        echo "Rsync output was: $rsync_output"
+        no_change_count=$((no_change_count + 1))
+        echo "No changes detected. Incrementing no_change_count to $no_change_count."
+      else
+        no_change_count=0
+        echo "Changes detected. Resetting no_change_count to 0."
+      fi
+
+      echo "Rsync completed. Sleeping for 10 minutes..."
+      sleep 600
+    done
+
+    echo "No changes detected for 3 consecutive runs. Exiting."