Cluster-notes.md

 ## udocker setup
-TODO: link to snippet and explain it
+On cluster there is no possibility to use plain docker. An alternative to it that allows container usage is udocker. It has different command arguments from command line interface, for this reason there are two different sections inside [configuration file](configurastion-file), one for docker and another for udocker.
+
+There is a snippet that can be used to setup a udocker environment on cluster:
+
+1. go to this [link](https://gitlab.fbk.eu/dsip/templates/dl_setup/-/snippets/65)
+2. copy it in a file `udocker_setup.sh` inside your cluster home
+3. run `chmod +x udocker_setup.sh`
+4. run `./udocker_setup.sh`
+5. run `rm udocker_setup.sh`
+6. exit and enter again inside cluster
 
 ## udocker volume directories
 TODO: dirs creation before volumes mapping