Log in¶
To log in to our HPC resources, you can use an SSH client or Open OnDemand (see the Open OnDemand guide).
SSH client - terminal¶
| Cluster | Login hostname | Port |
|---|---|---|
| Devana | login.devana.sav.sk | 5522 |
| Perun | login.perun.sav.sk | 5522 |
On Linux/UNIX and Windows 10/11, open a terminal and connect to the appropriate cluster login node using SSH.
Specify the port with -p (default port is 22) and provide your private key with -i flag.
Devana:
ssh -p 5522 user@login.devana.sav.sk -i /path/to/private_key
Perun:
ssh -p 5522 user@login.perun.sav.sk -i /path/to/private_key
Replace user with your username, adjust the hostname according to the selected cluster,
and ensure the correct private key path is used. The private key must be generated as described
in the SSH Keys section.
Upon connection, one of the available login nodes (login[01-02] for Devana cluster
and login[01-04] for Perun cluster) is selected automatically.
First log-in
If you get a message that the authenticity of the host can't be established during the first log in, type yes.
If you want to log in to one specific login node, you can use the domain and port from the table.
| Login node | IP address / domain | Port |
|---|---|---|
| login01 | login01.devana.sav.sk | 5522 |
| login02 | login02.devana.sav.sk | 5522 |
| login01 | login01.perun.sav.sk | 5522 |
| login02 | login02.perun.sav.sk | 5522 |
| login03 | login03.perun.sav.sk | 5522 |
| login04 | login04.perun.sav.sk | 5522 |
Windows¶
- Open a New session using the "Sessions" button on top of MobaXterm screen.
-
Select SSH and enter the following values:
- Remote host: cluster login hostname (see table on top of the page)
- Username: your registered username
- Port: cluster SSH port (see table at the top of the page)
-
Enable the Use private key button and click the blue icon at the end of the bar.
- Locate the desired private key and click Open.
- Finally, click OK again to log into the remote server with key pair authentication.
-
Under Session, enter:
- Remote host: cluster login hostname (see table on top of the page)
- Username: your registered username
- Port: cluster SSH port (see table at the top of the page)
-
Navigate to Connection → SSH → Auth → Credentials.
- Click Browse... next to Private key file for authentication and select your private key.
- Return to Session and click Open to connect.
PuTTY cannot use keys in OpenSSH format
PuTTY does not support OpenSSH private keys directly.
If your key was generated in Linux or Windows (ssh-keygen), convert it to .ppk format using [PuTTYgen](https://the.earth.li/~sgtatham/putty/0.82/htmldoc/Chapter8.html#pubkey-puttygen) from the PuTTY package:
- Run PuTTYgen
- Click Load and select the OpenSSH private key
- Click Save private key to export it as a
.ppkfile
OpenVPN Client¶
ANSYS software package users only
The following section applies to users who want to use the ANSYS software package.
To use ANSYS software, you need to install the OpenVPN client and a browser plugin that supports 2FA. The OpenVPN client file (devana_vpn_client.ovpn) can be downloaded from the register portal under the VPN section (VPN icon).
Client Versions
Only OpenVPN client version 3.X is supported. It is recommended to use the latest stable version.
Alternatively, macOS users can use Tunnelblick, which is a free OpenVPN software.
Visit the official OpenVPN website to download the OpenVPN client for Windows. Then, click on the "Download OpenVPN Connect v3" button (see image below).
- Navigate to the directory where the OpenVPN software was downloaded (typically the "Downloads" folder).
- Double-click on "openvpn-connect-3.4.4.3412_signed.msi" (or the latest available version).
- A new installation window will appear.
- Click the "Next" button.
- On the next window, mark "I accept the terms in the License Agreement", then click "Next".
- Click "Install". If a security prompt appears, click "Yes" to proceed. The installation process will take a few seconds.
- Once the installation is complete, click "Finish".
- To open the OpenVPN application, click the Windows icon on the taskbar, type "OpenVPN", and select the application.
- If prompted with the agreement window below, click "Agree".
- In the "Import File" window, choose "Upload File" and either:
- Drag and drop the
devana_vpn_client.ovpnfile. - Click "BROWSE" and locate the
devana_vpn_client.ovpnfile manually.
- The imported file information will now be displayed. Click "Connect".
A new window will open in your default web browser, prompting you to log in using the same credentials as the registration portal.
After logging in, you will be asked for a one-time password (OTP) from your 2FA or prompted to set it up.
Upon successful authentication, you will see "Access Granted" on your screen.
When you return to the OpenVPN application, you should see the "Connected" status.
Visit the official OpenVPN website to download the OpenVPN client for macOS. Then, click on the "Download OpenVPN Connect v3" button (see image below).
- Wait until the download completes, then open it.
- Select the installer for your device (mac with Intel processor or mac with Apple chip).
- Click Continue when the installer window opens.
- Agree to the EULA and install.
- When prompted, enter your device password to install.
- Click Close when the installation completes.
Tunnelblick
If you have already installed the Tunnelblick app, you can use it.
- To open the OpenVPN application, open it from your Applications folder or via Spotlight.
- If prompted with the agreement window below, click "Agree".
- In the "Import File" window, choose "Upload File" and either:
- Drag and drop the
devana_vpn_client.ovpnfile. - Click "BROWSE" and locate the
devana_vpn_client.ovpnfile manually.
- The imported file information will now be displayed. Click "Connect".
A new window will open in your default web browser, prompting you to log in using the same credentials as the registration portal.
After logging in, you will be asked for a one-time password (OTP) from your 2FA or prompted to set it up.
Upon successful authentication, you will see "Access Granted" on your screen.
When you return to the OpenVPN application, you should see the "Connected" status.
Distribution support
First, check if your distribution is supported by the OpenVPN community on the following website.
The following distributions:
- Ubuntu 20.04 LTS (Focal Fossa)
- Ubuntu 22.04 LTS (Jammy Jellyfish)
- Linux Mint 21.1 (based on Ubuntu Jammy Jellyfish)
First, update the local package index using the following command (for this step you need the sudo password). Then install the apt-transport-https package using the command below, which enables the use of HTTPS repositories in the APT (Advanced Packaging Tool) package manager. It allows APT to securely download packages over an encrypted HTTPS connection.
sudo apt update
sudo apt install apt-transport-https
sudo wget https://swupdate.openvpn.net/repos/openvpn-repo-pkg-key.pub
sudo apt-key add openvpn-repo-pkg-key.pub
# if you have Ubuntu 20.04 LTS, replace openvpn3-jammy.list in the URL with openvpn3-focal.list
sudo wget -O /etc/apt/sources.list.d/openvpn3.list https://swupdate.openvpn.net/community/openvpn3/repos/openvpn3-jammy.list
sudo apt update
sudo apt install openvpn3
# to check the OpenVPN 3 version, write the following into the terminal
openvpn3 version
After installation, check your OpenVPN version by typing openvpn3 version into the terminal.
To connect to a VPN server, navigate to the directory where the devana_vpn_client.ovpn file is located, or use the full path to the file (see examples below).
#when I am in the given directory
openvpn3 session-start --config devana_vpn_client.ovpn
#using whole path for devana_vpn_client.ovpn file
openvpn3 session-start --config /home/test/Desktop/devana_vpn_client.ovpn
A new window will open in your default internet browser, prompting you to log in using the same credentials as the registration portal.
After you successfully log in, you will be asked for a one-time password from 2FA or prompted to set it up.
Upon successful authentication, you will see "Access Granted" on your screen.
To display whether you have connected successfully, run the following command (first line in the grey box below). The box also contains an output example; the last line shows the connection status.
openvpn3 sessions-list
-----------------------------------------------------------------------------
Path: /net/openvpn/v3/sessions/2996e9c1sf35es49c0s91c3s5b2afc4cae4c
Created: Wed Feb 14 14:42:11 2024 PID: 8750
Owner: test Device: tun0
Config name: /home/test/Desktop/devana_vpn_client.ovpn (Config not available)
Session name: 147.213.81.142
Status: Connection, Client connected
To close VPN connection run following command:
# In this case, the whole path is used for devana_vpn_client.ovpn client
openvpn3 session-manage --config /home/test/Desktop/devana_vpn_client.ovpn --disconnect