changed computing info

computing.md

@@ -74,3 +74,32 @@ To allow shared access to a git repository folder:
 ````
 git config --get core.sharedRepository
 ````
+
+# Remote access (how can users get to RA)
+## Through hop.psi.ch (nicer way)
+Connect to PSI network for data access
+`ssh -L user_name@hop.psi.ch user_name@ra.psi.ch -L5000:jupytera.psi.ch:443`
+
+after that, just open the browser and type:
+`https://localhost:5000/hub/login`
+
+## Through NoMachine
+see https://gitlab.psi.ch/maloja/docs/-/wikis/python/Getting-started 
+
+# Setting up the cluster:
+This is a short summary of the steps to be followed to access the experimental data and the compute resources available for Cristallina users.
+
+###  Set up the enviroments paths
+Once on ra (ssh user_name@ra.psi.ch as described above), create a symbolic link to the bash file:
+`ln -s /sf/cristallina/bin/setting_up_ra.sh ~`
+
+and run it
+`sh setting_up_ra.sh`
+
+This should set up the working python enviroments. For the analysis, please use the 'analysis' enviroment, which is set as a default one. 
+
+### Running own jupyter instance
+Once on ra, copy the bash file:
+`cp /sf/cristallina/bin/jupyter_on_ra.sh ~`
+and run it.
+