Reset user password

Reset of a user password or creating a new CS user acount will permit access to CS services and computers. Brows into this link for reset password or create account.

VPN connection

VPN connection allows access to all of BGU computing inner services (such as S drive) from outside the campus.

For Windows installation use this guide.

For Linux installation:

Download VPN client app for Linux here: vpn.tar

5/8/21 - VPN fix for Linux and Mac users

1. Make sure that all prerequisites listed in the link are installed:

https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk65210

2. Download the installation file:

Linux - new_Linux_vpn_installation

Mac - new_Mac_vpn_installation

3. Run the script

Linux users:
run the command: sh snx_install_linux30.sh (or sudo sh snx_install_linux30.sh)

Mac users:
run the command: sh snx_install_osx.sh (or sudo sh snx_install_osx.sh)

Installation Example (Ubuntu 16.04 - 20.04): Installation Example

Remote UNIX connection

CS has some strong UNIX server for remote connections. This server contains many usable applications. coonecting may be done from inside the BGU network or by using VPN.

1. The first thing is to know the name of the pc you want to connect to… You can find the names at: https://www.cs.bgu.ac.il/~cswiki/faq/labs.html

You can only connect to a pc that is currently ON and running Linux
You can find that by "pinging" the pc and see if it responds and if it does, make sure that TTL is 64 (or 62) and not 128 (or 126)

2. The next stage is to connect using the command line or any app that support ssh (e.g putty/mobaxterm)

using the command line (usually from linux clients)

run the command:
ssh -X <username>@<computer-name>.cs.bgu.ac.il , for example: ssh -X cswiki@cs314row1-1.cs.bgu.ac.il

You might see the following message:

enter yes and Enter

using putty/mobaxterm - with gui support (from windows/mac clients):

For GUI support, you need to download and install Xserver (such as xming: https://sourceforge.net/projects/xming/)

make sure that xming is running in the background (see attached picture)

When using putty, go to "Connection" –> "SSH" –> "X11" and enable X11 forwarding

remote/putty2.png

then, go back to "Session" and enter the hostname you wish to connect to and click "Open"

remote/putty1.png

When using MobaXterm, start a new session

remote/moba1.png

On the new session screen, make sure that the type of connection is SSH. Enter the hostname and your username Click on "Advanced SSH Settings" and make sure that "X11-Forwarding" is enabled

remote/moba2.png

Printers

CS Deprtment posses 4 greyscale printers, one on ech floor (1th-4th) and a color printers at the technical lab (room 009).
For installation subbmit a rquest to help@cs.bgu.ac.il.

Netwrok Drive

Each CS Department user have a 10GB network drive. On our labs/office desktops it is being distributed as O drive on windows OS. On Linux systems it is mostly being mounted as the user's home folder.
Accessing this drive remotly can be done by following the next guide:
Instructions how to connect the Home Directory from outside the BGU netrwork.pdf

GPC/CPU Cluster

CS Department posses 2 main HPC : PCU and GPU.
each of them requiers an account. Subbmit a request to help@cs.bgu.ac.il to get access.

GPU Cluster User Guide

ISE_CS_DT_GpuClusterUserGuide.pdf

CPU Cluster User Guide

ISE_CS_DT_CpuClusterUserGuide.pdf

Service request

In order to open a new service request adrressing any technical issue please wrtie an email to help@cs.bgu.ac.il. Submmit a full description of the probelm your facing, add your PC name and contact details.

Personal WebPage Setup

ou can create a personal home page inside our department as : http://www.cs.bgu.ac.il/~YOUR_USER_NAME

To create your home page you need to:

Create directory ".html" : In Linux type mkdir .html
Inside .html create index.html or index.php file which will be your leading home page :
enter the directory: cd .html
creating index file: touch index.html
Make sure your home dir & .html has at least 711 permission (so that the web server will be able to read files under ~/.html):
to change permission to home dir: chmod 711 ~YOURUSERNAME
change permission to .html: chmod 711 ~/.html/
The files under .html should be world readable (permission 755) : chmode -R 755 ~/.html/*

Protection

For protection from other users that can access to your html directories, you can creat two files:

.htpasswd in some directory (in home directory for example)
.htaccess in directory that you want to protect.

File .htpasswd may be created by standard Unix utility htpasswd. Just type htpasswd -c .htpasswd <username> and after enter a password for .

File .htaccess may contains next lines:

AuthName "My Secure Directory"
AuthType Basic
AuthUserFile /absolute/directory/path/to/.htpasswd
AuthGroupFile /dev/null
<Files ~ "^\.ht(access|passwd)">
    Order allow,deny
    Deny from all  
</Files>
<Limit GET POST>
  require valid-user
</Limit>

Pay attention that .htaccess has right absolute path to your .htpasswd .

Linux Troubleshooting

Application Unlocking

Some applications don't start saying that it's profile is already in use or locked

Mozilla Firefox

Run the following command to unlock the firefox profile ~newstd/bin/unlockFirefox

Graphical Login Problems on Linux

Symptoms and Solutions

In login window after you enter your login and password the following symptoms might happen:

You immediately get "login failed" message - this means that your entered wrong password - make sure that you use your windows password (for both linux and windows login).
If you haven't created a windows account or forgot your windows password you can create/change your account details at: Change/create password
The login process starts but get's stuck for indefinetly long (black screen), Most known reasons:
- You've maxed out your allowed storage sapce (10G)
- your .KDE folder or config files got corrupted
To solve those issues: reboot the pc (select Ubuntu when asked) and log in via text mode after (see "Text mode login" section below)
- run the command ~newstd/bin/checkQuota to see what takes all the space (press q to exit when done) - delete all unnecessary data using the rm command
  You can run the command ~newstd/bin/clearTrash to remove all data in the "Recycle Bin"
- run the command ~newstd/bin/fixPlasma to fix (remove) corrupted files
- exit "Text mode login" and try to login via the graphical interface
See "Text Mode login" on how to run commands without using the graphical interface
The login process start and then returns back to login window - The default Desktop session for Kubuntu is "plasma". Changing the desktop session to plasma will fix the issue
If for some reason you need to work with "Ubuntu Desktop session" or "Mate" you need to login using "Text mode login (see below) and run the script ~newstd/bin/fixUbuntu
The login process starts but there are no applications (terminal etc') available to the user - Usually a quota problem, see relevant section
The login process starts but the computer seems to run very slow, programs ilke chrome/firefox fail after a few minutes, files can't be downloaded (or saved with size 0) - Usually a quota problem, see relevant section

Text Mode Login

When graphical login does not work you can login in text mode.

By pressing CTRL+ALT+F2 you will get text mode login terminal, where you need to type your login and password.
In the end you need to logout from the text login Ctrl-d or the command exit and go back to Graphical login window by pressing CTRL+ALT+F1

Quota Problem

When quota is exceed (or very close ot being exceeded) you may experience several problems like:

Not being able to login in Linux, since during login/initialization desktop environment, the system needs to create/modify files in your account, since they won't be able to do so due to exceeded quota, you won't be able to login.
Files you modify/create both from Linux and Windows (through O: network drive)will be truncated to zero size, due to quota limit. Still files are created with zero size since the block limit is exceeded but i node limit is not, so i nodes (ie. files) will be created but with no data blocks allocated to them, thus with zero size.

Run ~newstd/bin/checkQuota command and see if you have exceed (or very close to exceeding) your quota.(press q to exit when done)

So in case there is quota problem do the following:

Run the following script ~newstd/bin/clearTrash to clean your recycle bin
Run the following command ~newstd/bin/fixPlasma to clean the cache folder.

See Quota for more detailed information

Overleaf & Grammarly

For CS/MATH/SE students only

Overleaf is an online LaTeX and Rich Text collaborative writing and publishing tool that makes the whole process of writing, editing and publishing scientific documents much quicker and easier.

grammarly is an online writing application.

CS/MATH/SE users can ask for license for both services by submitting a request for help@cs.bgu.ac.il

CS Computing Services

For Staff

Reset user password

VPN connection

For Windows installation use this guide.

For Linux installation:

Download VPN client app for Linux here: vpn.tar

5/8/21 - VPN fix for Linux and Mac users

Installation Example (Ubuntu 16.04 - 20.04): Installation Example

Remote UNIX connection

using the command line (usually from linux clients)

using putty/mobaxterm - with gui support (from windows/mac clients):

Printers

Netwrok Drive

GPC/CPU Cluster

CS Department posses 2 main HPC : PCU and GPU.
each of them requiers an account. Subbmit a request to help@cs.bgu.ac.il to get access.

GPU Cluster User Guide

CPU Cluster User Guide

Service request

Personal WebPage Setup

Protection

Linux Troubleshooting

Application Unlocking

Mozilla Firefox

Graphical Login Problems on Linux

Symptoms and Solutions

Text Mode Login

Quota Problem

Overleaf & Grammarly

CS Computing Services

For Staff

Reset user password

VPN connection

For Windows installation use this guide​.

For Linux installation:

Download VPN client app for Linux here: vpn.tar

5/8/21 - VPN fix for Linux and Mac users

Installation Example (Ubuntu 16.04 - 20.04): Installation Example​

Remote UNIX connection

using the command line (usually from linux clients)

using putty/mobaxterm - with gui support (from windows/mac clients):

Printers

Netwrok Drive

GPC/CPU Cluster

CS Department posses 2 main HPC : PCU and GPU.each of them requiers an account. Subbmit a request to help@cs.bgu.ac.il to get access.

GPU Cluster User ​​Guide​

CPU Cluster User ​​​Guide​

Service request

Personal WebPage Setup

Protection

Linux Troubleshooting

Application Unlocking

Mozilla Firefox

Graphical Login Problems on Linux

Symptoms and Solutions

Text Mode Login

Quota Problem

Overleaf & Grammarly

For Windows installation use this guide.

Installation Example (Ubuntu 16.04 - 20.04): Installation Example

CS Department posses 2 main HPC : PCU and GPU.
each of them requiers an account. Subbmit a request to help@cs.bgu.ac.il to get access.

GPU Cluster User Guide

CPU Cluster User Guide