External SSH Access to ISIMA/LIMOS Computing Resources

To be able to access IIA and LIMOS computing resources via SSH, the following prerequisites must be met:

• Have an account
• Have submitted your public key via the ticket manager

If you are unsure what a public key is, please consult the Public/Private Key Authentication section.

SSH Connection to ext.limos.fr

The SSH server is available at ext.limos.fr and listens on port 2225.

Warning

The server ext.limos.fr is not intended for file storage. You may use it as a temporary zone for a few dozen minutes to transfer data to/from the computing servers.

Connecting from Linux or Mac

To establish such a connection from Linux or macOS, you can use the following command:

ssh your_username@ext.limos.fr -p 2225

If you wish to connect to Linux resources in graphical mode (X), you can use the following command:

ssh -Y your_username@ext.limos.fr -p 2225

If you are using a Mac, this assumes you have previously installed XQuartz.

Once connected to the bastion host, you will need to initiate another SSH connection with "X forwarding" enabled using the command:

ssh -Y your_username@final_server

Connecting from Windows

You can use PuTTY to connect via SSH from a Windows machine. Note that you must specify several settings:

• The server address in the field labeled "Host Name (or IP address)"
• The port must be set to 2225 as shown below

• Specify the path to your private key file that corresponds to the public key you previously sent to cri-commun@isima.fr. This setting is found under "Connection/SSH/Auth" then "Private key file for authentication".

If you wish to connect in graphical mode from PuTTY, you must enable "X forwarding" in the X11 configuration panel of PuTTY. This assumes you have previously installed an X server for Windows. A popular X server for Windows: Xming