Voir la source de Computing, Data Management and Linux Resources

== Connecting to Polytechnique desktops ==

* the first way to connect is though ssh, which, to put it simply, gives you the same access as to a terminal locally (see below for terminal resources)
** ask the responsible person for the computer ip address and ssh port. You can then connect through <code>ssh -p [port] [user]@[ip_address]</code> using your local user name and password.
* one can use a proprietary tool like Teamviewer for remote graphical access, but the free version has quirks and sometimes won't work anymore. In that case, one can use a 100% free solution relying on VNC (included on MacOS). 
** make sure a VNC server (we'll use [https://wiki.archlinux.org/title/X11vnc x11vnc] since it is lightweight and full featured) is installed on the target computer
** create a tunnel to the computer and start by typing 
 ssh -t -L 5900:localhost:5900 username@ipaddress -p port 'x11vnc -localhost -display :0

where the username, ipaddress and port are replaced by the appropriate values (removing the last part in single quotes creates the tunnel, and one has to start x11vnc after connection)
:* if a user is connected locally on the computer, you must connect as the same user through ssh.
:* it may be necessary to type <code>xhost + local:</code> before starting x11vnc.
:* connect to the computer using a VNC client, eg vinagre on Linux or [https://www.realvnc.com/en/connect/download/vnc/ realVNC] (the integrated client in MacOS insists on having a password, but we are not using one here): the address is simply 'localhost' since the tunnel does as if the remote computer is local on the specific VNC port (5900)
* access to files can be done through secure ftp (sftp) using a client like [https://filezilla-project.org/ filezilla] or on the command line using scp with the same information as for ssh.

== Other ==
* Taming the terminal https://ttt.bartificer.net/book.html