Rlogin

rlogin

rlogin is the Computer Science department's student login cluster. Information about access can be found on its homepage, but at time of writing it is available to declared Computer Science majors, as well as anyone currently enrolled in a CS class.

Use

Many professors use rlogin as a persistent shell server to run autograder scripts that hit the Canvas API: notably in CS2505, 2506, and Systems.

Student use is generally permissive: User:Rsk used it for bruteforcing hashes before he had access to LUUG hardware.

Setup

rsk@acidburn:~$ curl http://rlogin.cs.vt.edu/nodes.txt 2> /dev/null | grep rlogin | uniq | wc -l
37
rsk@acidburn:~$

indicates that the rlogin cluster has 37 nodes, 5 of which are GPU boxes. homedirs are mounted from a ceph cluster, as seen below.

[rishik@hackberry ~]$ df -h  | grep ceph
homes@00000000-0000-0000-0000-000000000000.cephfs=/home          77T   20T   58T  26% /home
glogin@00000000-0000-0000-0000-000000000000.cephfs=/glogin       77T   20T   58T  26% /opt
web@00000000-0000-0000-0000-000000000000.cephfs=/web/export      48T  1.1T   47T   3% /web
homes@00000000-0000-0000-0000-000000000000.cephfs=/home/ugrads   20T   11T   10T  51% /home/ugrads
[rishik@hackberry ~]$ 

At time of writing, individual nodes are of the following specs:

• Dell R640 1U server
• 2x Intel Xeon Gold 5218 2.3Ghz 16 core processors
• 384 GB Main memory @ 2933 MT/s
• 1TB system drive
• 10 Gbit Ethernet interconnect

The Rlogin cluster is colocated in McBryde hall.