Logging in to Rockfish

This section covers how to log into Rockfish and transfer files to and from the system.

Use Secure Shell (SSH) to connect:

ssh -XY <userid>@login.rockfish.jhu.edu

You can also use:

ssh -XY login.rockfish.jhu.edu -l <userid>

Gateway: login.rockfish.jhu.edu

Access to Login Node

Once you establish a connection, SSH will prompt for your password. Once you have signed into the login node, you should see the Message of the Day “MOTD”.

Quota information will be provided to users automatically on login, but users can use the quotas.py command at anytime to view quota and usage information.

Thu Mar 10 09:45:29 2022 from 172.28.3.75
 ____            _    _____ _     _
|  _ \ ___   ___| | _|  ___(_)___| |__
| |_) / _ \ / __| |/ / |_  | / __| |_ \
|  _ < (_) | (__|   <|  _| | \__ \ | | |
|_| \_\___/ \___|_|\_\_|   |_|___/_| |_|
[STATUS] loading software modules
[STATUS] modules are Lmod (https://lmod.readthedocs.io/en/latest/)
[STATUS] software is Spack (https://spack.readthedocs.io/en/latest/)
[STATUS] the default modules ("module restore") use GCC 9 and OpenMPI 3.1
[STATUS] you can search available modules with: module spider <name>
[STATUS] you can list available modules with: module avail
[STATUS] loading a compiler, MPI, Python, or R will reveal new packages
[STATUS] and you can check your loaded modules with: module list --terse
[STATUS] to hide this message in the future: touch ~/.no_rf_banner
[STATUS] restoring your default module collection now

Quota and usage information. Updated hourly. Use 'gpfsquota'
Usage for group MyGroup
FS         Usage   Quota  Files_Count  File_Quota
---        ---     ---    ---          ---
data       5.07T   10T    2287948      4194304
scratch16  1.939T  10T    1005210      10240000
scratch4   4.177T  10T    1159700      20480000
[userid@login02 ~]$

Multiplexing SSH Connections

To avoid re-entering your password and two-factor code with each connection, you can enable SSH multiplexing:

Edit (or create) ~/.ssh/config on your local Unix-based machine:

Host login.rockfish.jhu.edu
    ControlMaster auto
    ControlPath ~/.ssh/control:%h:%p:%r

Start the master connection:

ssh -fNM -X login.rockfish.jhu.edu -l <userid>

To stop the connection:
```
ssh -O stop login.rockfish.jhu.edu
```

Note

Large file transfers and terminal sessions may experience lag when using the same multiplexed connection.

Windows users: Use PuTTY or MobaXterm (Home Edition → Installer edition) to connect. MobaXterm includes an X11 server for GUI apps and supports SFTP file transfers.

Mac users: Use the built-in Terminal. For GUI support, install XQuartz.