set 4G RAM limit

docker-compose.yml

@@ -1,4 +1,4 @@
-version: '2'
+version: '2.1'
 
 volumes:
   data: {}
@@ -23,3 +23,15 @@ services:
       - PULSE_SERVER=unix:$XDG_RUNTIME_DIR/pulse/native
       - TZ=Europe/Amsterdam
     shm_size: 4G
+    mem_limit: 4G
+
+# For versions above: '3.0'
+#    deploy:
+#      resources:
+#        limits:
+#          memory: 4G
+#      restart_policy:
+#        condition: none
+#        delay: 5s
+#        max_attempts: 1
+#        window: 120s