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Department of Computer Science

Technical Services and Support

Instructional Lab

Last modified:  Jan 16, 2024


  • ūüÜē Jan 16, 2024:¬† As of June 2024, ScarletMail/Apps Account will be limited to 30GB of space. There is no more unlimited ScarletMail storage.
  • ūüÜē Jan 5, 2024:¬† Due to recent OS security upgrade, certain SSH Client may be complaining about authenticity of ssh keys as follow.
    This is expected as your ssh client may not recognize the new ED25519 finger print. So, it is safe to enter ‘yes‘ to continue.

  • ūüÜē Aug 7,2023: Due to recent OS upgrade to Ubuntu 22.04, iLab{1-4}.cs may be complaining about ssh keys as follow:

    This is a normal issue as the new installs have new keys.  To fix this problem on Linux/MacOS machine, type:
    ssh-keygen -f ~/.ssh/known_hosts -R ""
Past Announcements
    • On Sep 23, 2021, latest version of¬† Netbeans, IntelliJ IDEA and PyCharm IDEs were added to all iLab machines.¬† Students learning how to program in¬† Java may want to check Netbeans.
    • As of Aug 31, 2021, access to Windows Remote Desktop Gateway ¬†requires NetID+. If you have not done so, please activate your NetID+¬† if you have not done so.
    • All iLab machines had been upgraded to Ubuntu 20.04.
    • If you are NOT seeing your iLab files in /common/home home directory, please look in ilabfolder.¬†All users who had used /common/home before the move, had all files¬† from /ilab/users moved toilabfolder to avoid data lost.
    • Saturday morning, May 29, all ilab and grad systems will be down to change over to new home directories. Downtime will start around 9am. It may only take an hour, but plan on the systems being up by noon.WARNING: For a few hours on Saturday your directories may be missing files you created recently. We‚Äôll update them within a few hours of bringing the systems back up.The current home directories are being merged into /common/home. While most people probably don‚Äôt care what the name of their home directory is, if you do, it will be /common/home/NETID rather than /ilab/home/NETID.* If you haven‚Äôt used /common/home already, your current home directory will be moved to it. You shouldn‚Äôt see anything different unless you have scripts with absolute file names in them. If you don‚Äôt know what /common/home is, this alternative applies to you.* If you have files on /common/home, we‚Äôll leave them alone, and put your ilab home directory into a subdirectory called ‚Äúilab‚ÄĚ. Depending upon how you have been using /common/home, you may want to move startup and configuration files such as .bashrc from that ilab subdirectory to your home directory.In most cases this will result in a larger quota, since the quotas on /common/home are
      * Undergrads and masters: 50 GB
      * PhD and faculty : 200 GBLater this summer we will be migrating /common/users to a new file system. It will get larger quotas. The difference between the two is that /common/home is on SSD disk, while /common/users is on conventional disk. So /common/home should be faster. The difference may not be so apparent, because the limit is really the network protocol. But we would ask that you do I/O intensive jobs such as AI training using /common/home if possible.
    • As of Jan 19. 2021, /filer/tmp2 has been removed as announced. Please use¬†/filer/tmp1 (bigger, newer and SSD based)¬†See¬†¬†Storage and Technology Options for more info.
    • As of Jan 15, 2021, iLabU machines have been upgraded to Ubuntu 20.04 LTS for those who wants to run latest version of Ubuntu. All other CS machines will be upgraded to Ubuntu 20.04 LTS in late Summer 2021.
    • Please note /filer/tmp2 will be discontinued on Jan 18, 2021. All users should be moving important data to /filer/tmp1(bigger, newer and SSD based). We wont be doing our semesterly wipe of /filer/tmp1 this semester to speed up this transition to /filer/tmp1.
    • On Nov 12, 2020, Apple released a new MacOS BigSur. There are many issues with this update. See Mac OS BigSur FAQ for more details. Please do not update your Mac mid semester unless you can live without it.
    • We have just added a new file server based on NVMe memory (a type of SSD). It is called /common/home. It‚Äôs also being used for /filer/tmp1. For more details, see¬† Storage and Technology Options
    • If you are using MacOS X 10.15 (Catalina), make sure you update to the latest version. MacOS X 10.15 Catalina is full of bugs causing problems with XQuartz, control keys, key mapping, X2Go and many others.
    • On¬† Mon, Aug 31, 2020 btw noon-1pm, all your files will be removed from /freespace/local on all iLab machines in accordance with the policy README file. If you need to keep anything, please copy it elsewhere — for example, to /common/users which has 100GB quota.
    • iLab machines are being converted from Centos 7 to Ubuntu 18.04 LTS system this summer to bring us closer to more recent release of software. If you are having issues connecting via ssh client, try update your client.
    • During Summer 2020, all CS CentOS7 Linux machines will be upgraded to Ubuntu 18.04. Please expect down time.¬† We will post notices at LCSR Twitter site. Machines in Hill 248 and Hill 252 will not be upgraded until after Summer session is over.
    • On Memorial day, Mon, May 25, 2020 btw noon-1pm, all your files will be removed from /freespace/local on all iLab machines in accordance with the policy README file. If you need to keep anything, please copy it elsewhere — for example, to /common/users which has 100GB quota.
    • April 1, 2020:¬† OIT wrote, ‚Äúdue to recent and increasing exploits utilizing RDP, a decision was made to block this port from the internet into Rutgers University address space.‚Ä̬†This means to use Remote Desktop service to connect to iLab machines, you need to utilize¬†VPN¬†service or¬†Remote Desktop Protocol Gateway Service.¬†OIT recommends the later for better performance.¬† You can also utilize macgateway described in¬†Working at Home document to connect using Remote Desktop Protocol
    • As of October 1, 2019, we have enabled access to¬†/dresden/users¬†home directory on iLab machines. This means CBIM users who has access to¬†/dresden/users¬†home directory can access their data from iLab machines without first copying them locally saving everyone both¬† time and disk space.
    • Dropbox¬† is not supported as of¬†Oct 15 2018.¬†Use¬†Scarletmail Google Drive.¬†You have¬†unlimited space¬†there instead of 2GB from Dropbox.
    • Starting Fall 2018, all users should be using a machine named:¬†¬†which will randomly pick iLab1.cs, iLab2.cs or iLab3.cs. See iLab Machine Status¬†to find status of all iLab servers and iLab desktop machines.
    • For those users who use emacs on x2go, please use:¬†emacs-23.1¬†to avoid compatibility issue.


  • To access iLab machines, see¬†Using CS WebLogin to Access iLab Machines
  • We provide at least 50GB of storage in /common/home/your_netid and 100GB in /common/users.your_netid. If you still need more storage space, see¬† Storage and Technology Options.
  • Please follow us on X/Twitter @RutgersLCSR for up-to-date announcements
  • If you are new to¬†CS Resources, see¬†Introduction¬†and¬†¬†General Computing¬†page
  • Please consult Working at Home page to assist you with your computing need at home.
  • There are reports that some people are having keyring issue when opening a browser.¬† If you forgotten your keyring password, the fix is to delete your saved password by typing this in terminal window. rm ~/.local/share/keyrings/*.keyring You will be asked again to create a new password when you re-run the brower.
  • ¬†If you changed your password while a session is locked, you may get this error,¬†
    Authentication Required! The password you use to log into your computer no longer matches that of your login keyring“, to fix your problem, login on the text console and type:

    killall -9 gnome-keyring-daemon
    rm   ~/.gnome2/keyrings/*.keyring

    To get a text console, type:  + of the machine. To return to Graphical console, type:  + 

Finding a Computer to Use

  • For direct connection using Weblogin, SSH, X2GO and Windows Remote Desktop , we recommend remote users to use machine named: which is an alias for¬† iLab1.cs, iLab2.cs, iLab3.cs or iLab4.cs. If you prefer other machines, please¬† look at the iLab machines list and¬† status¬†to find the best iLab machines to use.
  • For Remote Development using vscode, please pick specific machine name like¬† and do not use alias name like: to avoid issue where vscode connects to multiple machines and causing issues. We recommend you spend a few minutes to watch the tutorial to avoid issues.
  • If you have issue with specific iLab machine, report it or check¬† Status of iLab Machines¬†and pick a different machine.
About iLab

The iLab cluster includes remotely accessible machines via Weblogin, SSH, X2GO and Windows Remote Desktop and 3 publicly accessible rooms (Hill 248, Hill 252, or Hill254)

Class and System Specific Notices
Using iLab Machines

To use CS iLab Machines, we recommend users to check list of available machines and their status first then:

Home Pages for Students
You can setup iLab home pages. This homepage needs to be stored in world readable public_html folder within /common/home/web, i.e. /common/home/web/$USER/public_html and is accessible via See Publishing web pages or CS Homepage Manager for more details.
Trouble logging

For help with our systems or If you need immediate assistant, visit¬†LCSR Operator¬†at CoRE 235 or call 848-445-2443. Otherwise, see¬†CS HelpDesk.¬†Don’t forget to include your NetID along with descriptions of your problem.