There are 2 ways to login to TACC supercomputer Stampede2 supercomputer.

via XSEDE SSO Hub

0) Set up Duo for XSEDE user portal SSO account

1) Login to XSEDE SSO (Single Sign On) Hub:

$ ssh -l shawdong login.xsede.org

2) Login to Stampede2:

[shawdong@ssohub ~]$ gsissh stampede2

direct SSH

0) Set up Multifactor Authentication at TACC

1) Login to Stampede2:

$ ssh shawdong@stampede2.tacc.utexas.edu