Open OnDemand (OOD) is platform for accessing the clusters that only requires a web browser. This web-portal provides a shell, file browser, and graphical interface for certain apps (like Jupyter or MATLAB).
If you access Open OnDemand installed on YCRC clusters from off campus, you will need to first connect to the Yale VPN.
Open OnDemand is available on the following clusters using your NetID credentials (CAS login).
The above four URLs are also called cluster OOD URLs. They are available to any user with a research account (also called a lab account) on the clusters. Your research account is the same as your NetID.
Course Open OnDemand Web Portals
Courses on the clusters have their own course-specific OOD URLs, also called course OOD portals. Through the course OOD URLs, students will sign in with their NetID but work under their student account. The course URLs all follow the same naming convention:
coursename.ycrc.yale.edu. More information about course OODs can be found at academic support.
If you only have a student account, but try to sign in through the cluster OOD URL, you will get an error in the browser:
Error -- can't find user for cpsc424_test Run 'nginx_stage --help' to see a full list of available command line options.
On login you will see the OOD dashboard.
Along the top are pull-down menus for various Apps, including File Managers, Job Composer, a Shell, a list of Interactive Apps, etc.
The file browser is a graphical interface to manage, upload, and download files from the clusters. You can use the built-in file editor to view and edit files from your browser without having to download and upload scripts.
You can also drag-and-drop to download and upload files and directories, and move files between directories using this interface.
Customize Favorite Paths
Users are allowed to customize favorite paths in the file manager. Using the scripts below to add, remove, and list custmozed favorite paths:
ood_add_path ood_remove_path ood_list_path
The scripts are self explanatory and will prompt you to add or remove paths to the Files pull-down menue, as well as the left pane when the file manager is opened.
You can launch a traditional command-line interface to the cluster using the Shell pull-down menu. This opens a terminal in a web-browser that you can use in the exact same way as when logging into the cluster via SSH.
This is a convenient way to access the clusters when you don't have access to an ssh client or do not have your ssh keys.
We have deployed a selection of common graphical programs as Interactive Apps on Open OneDemand. Currently, we have apps for Remote Desktop, MATLAB, Mathematica, RStudio Desktop, RStudio Server, and Jupyter Notebook, etc.
Occasionally, it is helpful to use a graphical interface to explore data or run certain programs. In the past your options were to use VNC or X11 forwarding. These tools can be complex to setup or suffer from reduced performance. The Remote Desktop app from OOD simplifies the configuration of a VNC desktop session on a compute node. The MATLAB, Mathematica, and RStudio Desktop Apps are special versions of this app. To get started choose Remote Desktop (or another desktop app) from the Interactive Apps menu on the dashboard.
Use the form to request resources and decide what partition your job should run on (use
interactive or your lab's partition).
Once you launch the job, you will be presented with a notification that your job has been queued. Depending on the resources requested, you may need to wait for a bit. When the job starts you will see the option to launch the Remote Desktop:
Note you can share a view only link for your session if you would like to share your screen. After you click on Launch Remote Desktop, a standard desktop interface will open in a new tab.
In some browsers, you may have to use a special text box to copy and paste from the Remote Desktop App. Click the arrow on the left side of your window for a menu, then click the clipboard icon to get access to your Remote Desktop's clipboard.
One of the most common uses of Open OnDemand is the Jupyter Notebook interface for Python and R. Jupyter Notebooks provide a flexible way to interactively work with code and plots presented in-line together. To get started choose Jupyter Notebook from the Interactive Apps menu on the dashboard.
Make sure that you chose the right Conda environment for your from the drop-down menu. If you have not yet set one up, follow our instructions on how to create a new one. After specifying the required resources (number of CPUs/GPUs, amount of RAM, etc.), you can submit the job. When it launches you can open the standard Jupyter interface where you can start working with notebooks.
If you have installed and want to use Jupyter Lab click the
Start JupyterLab checkbox.
Change User R Package Path
To change the default path where packages installed by the user are stored, you need to add the following line of code in your
Configure the Graphic Device
When you plot in a RStudio session, you may encounter the following error:
Error in RStudioGD() : Shadow graphics device error: r error 4 (R code execution error) In addition: Warning message: In grDevices:::png("/tmp/RtmpcRxRaB/4v3450e3627g4432fa27f516348657267.png", : unable to open connection to X11 display ''
To fix the problem, you need to configure RStudio Server to use
as the graphic device backend. To do so, first click
Tools from the top menu bar on
the RStudio Server GUI, and then select
Global options from the pull down menu. An option window will be opened.
In the window, click
general on the left panel and then click
Graphics on the right. Choose
Once done, it sets
Cairo as the default drawing device. You only need to configure the device once
unless you have cleaned up your RStudio configuration files.