Reminder: Direct SSH access to login.mcs.anl.gov from offsite being retired May 17, 2021

The previous announcement on this can be read here.

Some quick notes:

• As long as you have a GCE account, you can ssh to Legacy MCS login and compute nodes through GCE.
• If you don’t have a GCE account (why not?) you can ssh to Legacy MCS login and compute nodes via VPN, auth wifi, or from onsite.
• You will still see the banner notice warning you that the SSH conduits are going away.

Some quick tips:

1: If you have a recent enough openssh, the following command will get you to login.mcs.anl.gov without any configuration editing:

  ssh -J <argonneusername>@logins.cels.anl.gov <mcsusername>@login.mcs.anl.gov

2: The minimal amount of ssh config editing you would need to do to avoid the above is adding these lines to ~/.ssh/config (creating it if it doesn’t exist already)

Host login.mcs.anl.gov
ProxyCommand ssh [email protected] -q -W %h:%p

If you add those two lines, the command “ssh <mcsusername>@login.mcs.anl.gov” will land you on the SSH node.

3: As noted above, you will still see the banner notice when you land on login.mcs.anl.gov that warns of the SSH conduits going away.  If you want to make sure you’re coming in the right way, after login type “who -m”.  It will show you where you’re logged in from, and if it’s a cels.anl.gov host, you’re all set.

I’ll be hosting a town hall today at 1PM on Teams.