Accessing astro3

How to get access and connect to the astro3 cluster over SSH.
Requirements
Must be a member of the 
physics_astro3 LDAP group
Valid Tel Aviv University username and password
If connecting from outside the TAU network: TAU VPN must be active — see Palo Alto VPN
Login Node
Direct SSH to the astro3 head node — no load-balanced login pool like powerslurm:
astro3.tau.ac.il
Connecting via SSH
ssh your_username@astro3.tau.ac.il
With an SSH key:
ssh -i /path/to/your/private_key your_username@astro3.tau.ac.il
Important
Do not run compute jobs directly on the head node — use 
sbatch or 
srun
The head node is shared — heavy processes may be killed