You can browse through these folders, and drag-and-drop files and folders between this FTP file browser and the Windows File Explorer. Once you have logged in to the HPC system, you will see the file browser to the left of the terminal window, where it shows the contents of your home folder. MobaXterm has an integrated FTP file browser. Like scp, the use of the SFTP allows safe, encrypted transfer of data. Generally, FTP browsers support SFTP, i.e. So, if a file is added or removed (through a command in the terminal, or by one of your programs), this change does not show up in the FTP file browser until you refresh the folder. There is one difference with Windows File Explorer and Finder: folders are not automatically updated if their content is changed. In most FTP browers, you can drag-and-drop files to copy files from your own PC to the HPC system, or vice versa. the Windows File Explorer and Finder in MacOS. Scp -r ~ Other remote file-copying toolsįTP file browsers are generally very similar to e.g. To add the key to the local SSH agent, open a new terminal on your local machine and type To have password-less login, you have two options: either you don't enter a passphrase when generating the key-pair - not the safest solution - or you use the local SSH agent to store your passphrase for the duration of the login session on your workstation. However, now, your local PC will ask you for the passphrase every time you want to use the private key to authenticate. With the key in the SURF portal, the HPC system will authenticate you using the key-pair, rather than your password. Paste your public key in the SSH key field, and enter the password corresponding to your login in the CUA password field. Now, login on the SURF portal, go to 'Public ssh keys' and click 'add key'. starting with ssh-rsa and including the indentification of where it was created. The key starts with ssh-rsa then contains a long string of random characters, and ends with some identification of where it was created. Start MobaXTerm, go to Session => SSH and under remote host type fill in Here, we will assume that you use MobaXterm. If you want to redirect graphical output using Putty, you also need to check the option 'Enable X11 forwarding' under Windows => Category => Tunnels. Alternatively, you can use Putty (a very basic SSH client) in combination with a seperate FTP client like FileZilla and a seperate X server application like xming to redirect graphical output. The most convenient application is MobaXterm, as it also includes options for transferring files using an SFTP (SSH File Transfer Protocol) file browser and redirecting the graphical output from the HPC system to your local PC - we'll get to those options later. Windowsįirst, you need to install an SSH client. To aid in keeping the login nodes usable for all users there is an automatic cleanup active on the login nodes that will kill processes that take up too much CPU time and/or too much memory. The login nodes are not meant for running compute jobs, or even testing compute jobs! Such processes would hinder the other users of the login nodes. The login nodes are primarily meant for preparing and submitting jobs, checking on the status of your running jobs, and copying data to and from the HPC systems. A more extensive tutorial, can be found here. Note that some examples in the second tutorial (especially those about variables) are aimed at a different shell (csh) than the default shell used on Snellius and Lisa (bash), meaning that commands are slightly different. If you have no experience with Unix or Linux, we suggest you read our Unix tutorial for HPC clusters. Finally, you will learn how to transfer data between your own PC and the HPC systems. Then, we explain how you can login to the systems without having to enter your password every time. In this section, you will learn how to connect to the HPC systems using SSH (Secure Shell Protocol), either via an SSH client (Windows) or via SSH in a terminal (MacOS and Linux). The main way to interact with these machines is therefore not through a graphical user interface, as is the case for Windows and MacOS operating systems, but through text-based commands entered in a terminal window. Snellius and Lisa run a Unix-based operating system, which is text based.
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