cap-lab22-samy/SSHENSL.md

Remote work on ENSL machines

SSH on ENSL machines, Linux version (with your ENSL Account)

• Edit your .ssh/config and add the following lines:

Host !ssh.ens-lyon.fr *.ens-lyon.fr
ProxyCommand ssh -N -W %h:%p %r@ssh.ens-lyon.fr

• now ssh on one of the ENSL machines:

ssh mylogin@slsu0-02.dsi-ext.ens-lyon.fr

(slsu0 or slsu1, 01 to 20 at least, use -X if you want to use a graphical interface remotely).

Windows version.

• adapt the mobaxterm howto from this page The ssh gateway is ssh.ens-lyon.fr and the machine to log on is slsu[0-1]-...

Mount your ENS account on your laptop (Linux) with SSHFS.

• I give you in scripts/mountsinfoens a script I wrote many years ago, use with caution.

Remote debugging with tmux

tmux is a terminal multiplexer, that is you can transform one session into many virtual sessions. Here we are using it to share one session between multiple users so that we can help you debug in real time on your machine.

Follow the following steps to share a tmux session with another user (this method is not really secure and should not be used anywhere else):

• Connect a tmux session with a sensible name (ie. your id) in a shared directory (ie. /tmp): tmux -S /tmp/<yourid>
• Allow the socket to be read by others: chmod 777 /tmp/<yourid>
• Give us the name of the socket (/tmp/<yourid>) so that we can connect to your session with the command tmux -S /tmp/<yourid> attach

Inside your terminal session, you can use your favorite terminal editor, for example vim, emacs -nw, kak, nano or whatever you like.

Quick overview of tmux:

• C-b c : create a new window
• C-b n/p : go to next/previous window
• C-b d : detach current client
• C-b [0-9] : go to window [0-9]
• C-b " : split horizontally
• C-b % : split vertically
• C-b up : go up (same for down, left, right, etc), you can use ijkl