d2s_server_setup_docker.md

@@ -7,6 +7,14 @@
 * request gitlab docker read account and key to download docker images
 * for commercial use request license and license file
 
+## modification on enviroment
+
+we recommend to set the number of file handles to 100000
+
+* option a.) ulimit -n 100000 in the file /etc/init.d/docker
+* option b.) docker run --ulimit nofile=100000:100000 image:tag
+see further info here (https://docs.docker.com/engine/reference/commandline/run/#set-ulimits-in-container---ulimit) 
+
 
 ## setup D2Sphere
 * create dir /opt/d2sphere/d2s-ds