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Merlin 7
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Requesting Merlin Accounts
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Requesting a Merlin Project
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Accessing Interactive Nodes
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Accessing Slurm Cluster
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Transferring Data
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Remote Desktop Access to Merlin7
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Accessing Merlin7 NoMachine
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From Inside PSI
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Method 1: Using a Web Browser
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<h1 id="remote-desktop-access-to-merlin7">Remote Desktop Access to Merlin7<a class="headerlink" href="#remote-desktop-access-to-merlin7" title="Permanent link"></a></h1>
<h2 id="overview">Overview<a class="headerlink" href="#overview" title="Permanent link"></a></h2>
<p>Merlin7 NoMachine provides users with remote desktop access to the Merlin7 computing environment. This service enables users to connect to their computing resources from any location, whether they are inside the PSI network or accessing from outside via secure methods.</p>
<h2 id="accessing-merlin7-nomachine">Accessing Merlin7 NoMachine<a class="headerlink" href="#accessing-merlin7-nomachine" title="Permanent link"></a></h2>
<h3 id="from-inside-psi">From Inside PSI<a class="headerlink" href="#from-inside-psi" title="Permanent link"></a></h3>
<p>If you are inside the PSI network, you can directly connect to the Merlin7 NoMachine service without the need to go through another service.</p>
<ol>
<li><strong>Ensure Network Connectivity</strong>: Make sure you are connected to the PSI internal network.</li>
<li><strong>Choose Your Access Method</strong>: You can access Merlin7 using either a web browser or the NoMachine client.</li>
</ol>
<h4 id="method-1-using-a-web-browser">Method 1: Using a Web Browser<a class="headerlink" href="#method-1-using-a-web-browser" title="Permanent link"></a></h4>
<p>Open your web browser and navigate to <a href="https://merlin7-nx.psi.ch:4443">https://merlin7-nx.psi.ch:4443</a>.</p>
<h4 id="method-2-using-the-nomachine-client">Method 2: Using the NoMachine Client<a class="headerlink" href="#method-2-using-the-nomachine-client" title="Permanent link"></a></h4>
<p>Settings for the NoMachine client:</p>
<ul>
<li><strong>Host</strong>: <code>merlin7-nx.psi.ch</code></li>
<li><strong>Port</strong>: <code>4000</code></li>
<li><strong>Protocol</strong>: <code>NX</code></li>
<li><strong>Authentication</strong>: <code>Use password authentication</code></li>
</ul>
<h3 id="from-outside-psi">From Outside PSI<a class="headerlink" href="#from-outside-psi" title="Permanent link"></a></h3>
<p>Users outside the PSI network have two options for accessing the Merlin7 NoMachine service: through <code>nx.psi.ch</code> or via a VPN connection.</p>
<h4 id="option-1-via-nxpsich">Option 1: Via <code>nx.psi.ch</code><a class="headerlink" href="#option-1-via-nxpsich" title="Permanent link"></a></h4>
<p>Documentation about the <code>nx.psi.ch</code> service can be found <a href="https://www.psi.ch/en/photon-science-data-services/remote-desktop-nomachine">here</a>.</p>
<h5 id="using-a-web-browser">Using a Web Browser<a class="headerlink" href="#using-a-web-browser" title="Permanent link"></a></h5>
<p>Open your web browser and navigate to <a href="https://nx.psi.ch">https://nx.psi.ch</a>.</p>
<h5 id="using-the-nomachine-client">Using the NoMachine Client<a class="headerlink" href="#using-the-nomachine-client" title="Permanent link"></a></h5>
<p>Settings for the NoMachine client:</p>
<ul>
<li><strong>Host</strong>: <code>nx.psi.ch</code></li>
<li><strong>Port</strong>: <code>4000</code></li>
<li><strong>Protocol</strong>: <code>NX</code></li>
<li><strong>Authentication</strong>: <code>Use password authentication</code></li>
</ul>
<h4 id="option-2-via-vpn">Option 2: Via VPN<a class="headerlink" href="#option-2-via-vpn" title="Permanent link"></a></h4>
<p>Alternatively, you can use a VPN connection to access Merlin7 as if you were inside the PSI network.</p>
<ol>
<li><strong>Request VPN Access</strong>: Contact the IT department to request VPN access if you do not already have it. Submit a request through the PSI Service Now ticketing system: <a href="https://psi.service-now.com/psisp?id=psi_new_sc_cat_item&amp;sys_id=beccc01b6f44a200d02a82eeae3ee440">VPN Access (PSI employees)</a>.</li>
<li><strong>Connect to the VPN</strong>: Once access is granted, connect to the PSI VPN using your credentials.</li>
<li><strong>Access Merlin7 NoMachine</strong>: Once connected to the VPN, you can access Merlin7 using either a web browser or the NoMachine client as if you were inside the PSI network.</li>
</ol>
<h2 id="the-nomachine-client">The NoMachine Client<a class="headerlink" href="#the-nomachine-client" title="Permanent link"></a></h2>
<h3 id="installation">Installation<a class="headerlink" href="#installation" title="Permanent link"></a></h3>
<h4 id="windows">Windows<a class="headerlink" href="#windows" title="Permanent link"></a></h4>
<p>The NoMachine client is available for PSI Windows computers in the Software Kiosk under the name <strong>NX Client</strong>.</p>
<h4 id="macos-and-linux">macOS and Linux<a class="headerlink" href="#macos-and-linux" title="Permanent link"></a></h4>
<p>The NoMachine client can be downloaded from <a href="https://downloads.nomachine.com">NoMachine's download page</a>.</p>
<h3 id="connection-configuration">Connection Configuration<a class="headerlink" href="#connection-configuration" title="Permanent link"></a></h3>
<ol>
<li><strong>Launch NoMachine Client</strong>: Open the NoMachine client on your computer.</li>
<li>
<p><strong>Create a New Connection</strong>: Click the <strong>Add</strong> button to create a new connection.</p>
<ul>
<li>On the <strong>Address</strong> tab configure:</li>
<li><strong>Name</strong>: Enter a name for your connection. This can be anything.</li>
<li><strong>Host</strong>: Enter the appropriate hostname (e.g. <code>merlin7-nx.psi.ch</code>).</li>
<li><strong>Port</strong>: Enter <code>4000</code>.</li>
<li><strong>Protocol</strong>: Select <code>NX</code>.</li>
</ul>
<p><a class="glightbox" data-type="image" data-width="auto" data-height="auto" href="../../../images/nomachine/screen_nx_address.png" data-desc-position="bottom"><img alt="Create New NoMachine Connection" src="../../../images/nomachine/screen_nx_address.png"></a></p>
<ul>
<li>On the <strong>Configuration</strong> tab ensure:</li>
<li><strong>Authentication</strong>: Select <code>Use password authentication</code>.</li>
</ul>
<p><a class="glightbox" data-type="image" data-width="auto" data-height="auto" href="../../../images/nomachine/screen_nx_configuration.png" data-desc-position="bottom"><img alt="Create New NoMachine Connection" src="../../../images/nomachine/screen_nx_configuration.png"></a></p>
<ul>
<li>Click the <strong>Add</strong> button to finish creating the new connection.</li>
</ul>
</li>
</ol>
<h2 id="authenticating">Authenticating<a class="headerlink" href="#authenticating" title="Permanent link"></a></h2>
<p>When prompted, use your PSI credentials to authenticate.</p>
<p><a class="glightbox" data-type="image" data-width="auto" data-height="auto" href="../../../images/nomachine/screen_nx_auth.png" data-desc-position="bottom"><img alt="Create New NoMachine Connection" src="../../../images/nomachine/screen_nx_auth.png"></a></p>
<h2 id="managing-sessions">Managing Sessions<a class="headerlink" href="#managing-sessions" title="Permanent link"></a></h2>
<p>The Merlin7 NoMachine service is managed through a front-end server and back-end nodes, facilitating balanced and efficient access to remote desktop sessions.</p>
<h3 id="architecture-overview">Architecture Overview<a class="headerlink" href="#architecture-overview" title="Permanent link"></a></h3>
<ul>
<li><strong>Front-End Server</strong>: <code>merlin7-nx.psi.ch</code></li>
<li>Serves as the entry point for users connecting to the NoMachine service.</li>
<li>
<p>Handles load-balancing and directs users to available back-end nodes.</p>
</li>
<li>
<p><strong>Back-End Nodes</strong>:</p>
</li>
<li><code>login001.merlin7.psi.ch</code></li>
<li><code>login002.merlin7.psi.ch</code></li>
<li>These nodes host the NoMachine desktop service and manage the individual desktop sessions.</li>
</ul>
<p>Access to the login node desktops must be initiated through the <code>merlin7-nx.psi.ch</code> front-end. The front-end service will distribute sessions across available nodes in the back-end, ensuring optimal resource usage.</p>
<h3 id="opening-nomachine-desktop-sessions">Opening NoMachine Desktop Sessions<a class="headerlink" href="#opening-nomachine-desktop-sessions" title="Permanent link"></a></h3>
<p>When connecting to the <code>merlin7-nx.psi.ch</code> front-end, a new session automatically opens if no existing session is found. Users can manage their sessions as follows:</p>
<ul>
<li><strong>Reconnect to an Existing Session</strong>: If you have an active session, you can reconnect to it by selecting the appropriate icon in the NoMachine client interface. This allows you to resume work without losing any progress.
<a class="glightbox" data-type="image" data-width="auto" data-height="auto" href="../../../images/nomachine/screen_nx_single_session.png" data-desc-position="bottom"><img alt="Open an existing Session" src="../../../images/nomachine/screen_nx_single_session.png"></a></li>
<li><strong>Create a Second Session</strong>: If you require a separate session, you can select the <strong><code>New Desktop</code></strong> button. This option creates a second session on another login node, provided the node is available and operational.</li>
</ul>
<h3 id="session-management-considerations">Session Management Considerations<a class="headerlink" href="#session-management-considerations" title="Permanent link"></a></h3>
<ul>
<li><strong>Load Balancing</strong>: The front-end service ensures that sessions are evenly distributed across the available back-end nodes to optimize performance and resource utilization.</li>
<li><strong>Session Limits</strong>: Users are limited to one session per back-end node to maintain system stability and efficiency.</li>
</ul>
<h2 id="support-and-resources">Support and Resources<a class="headerlink" href="#support-and-resources" title="Permanent link"></a></h2>
<p>If you encounter any issues or need further assistance with the Merlin7 NoMachine service, support is available via email. Please contact us at <a href="mailto:merlin-admins@lists.psi.ch">merlin-admins@lists.psi.ch</a>, and our support team will be happy to assist you.</p>
<h3 id="advanced-display-settings">Advanced Display Settings<a class="headerlink" href="#advanced-display-settings" title="Permanent link"></a></h3>
<p>NoMachine provides several options to optimize the display settings for better performance and clarity. These settings can be accessed and adjusted when creating a new session or by clicking the top right corner of a running session.</p>
<h4 id="prevent-rescaling">Prevent Rescaling<a class="headerlink" href="#prevent-rescaling" title="Permanent link"></a></h4>
<p>Preventing rescaling can help eliminate "blurriness" in your display, though it may affect performance. Adjust these settings based on your performance needs:</p>
<ul>
<li>Display: Choose <code>Resize remote display</code> (forces 1:1 pixel sizes)</li>
<li>Display &gt; Change settings &gt; Quality: Choose medium-best quality</li>
<li>Display &gt; Change settings &gt; Modify the advanced display settings</li>
<li>Check: Disable network-adaptive display quality (turns off lossy compression)</li>
<li>Check: Disable client side image post-processing</li>
</ul>
</article>
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