C2110 UNIX and programming Lesson 1 / Module 3 -1C2110
UNIX and programming
Petr Kulhanek
kulhanek@chemi.muni.cz
National Center for Biomolecular Research, Faculty of Science
Masaryk University, Kamenice 5, CZ-62500 Brno
Lesson 1 / Module 3
PS / 2020 Distance form of teaching: Rev2
C2110 UNIX and programming Lesson 1 / Module 3 -2WOLF
cluster
➢ Classroom 1.18
➢ University traffic light
➢ Structure
➢ Rules of usage
➢ Administrators
➢ Creating account, password change, forgotten
password
C2110 UNIX and programming Lesson 1 / Module 3 -3Classroom
1.18
➢Classroom with 23 PCs
➢Arranged in a
computing cluster
The classroom is freely accessible to students working on projects at NCBR, as well as to
students who are taught in the classroom during a given semester..
Safety!
https://wolf.ncbr.muni.cz
Basic information:
C2110 UNIX and programming Lesson 1 / Module 3 -4University
Traffic Light
Computer room 1.18 is accessible to students.
Computer room 1.18 is inaccessible to
students.
Only remote access is allowed (ssh, scp, VNC, X11 export, etc.).
C2110 UNIX and programming Lesson 1 / Module 3 -5Structure
of WOLF Cluster
wolf wolf03 wolf23wolf02 wolfsr
university
network
workstations (computing nodes)
server / front
node
Operating system: Ubuntu 18.04 (Bionic) LTS
(http://www.ubuntu.com/)
0.18 1.18 2.11
wolf32 wolf40wolf31wolf30
0.18
wolf01
switch
computing nodes
Rooms:
0.18 Server room C04 / UKB
1.18 Computer room C04 / UKB
2.11 Seminar room C04 / UKB
0.57 Seminar room (library) C04 / UKB
All nodes are accessible directly from the public network.
Domain: ncbr.muni.cz
wolflr
0.57
forbidden to log in
C2110 UNIX and programming Lesson 1 / Module 3 -6Server
and Computing Nodes
WOLF cluster master server
WOLF cluster computing nodes
C2110 UNIX and programming Lesson 1 / Module 3 -7Rules
of Usage
The WOLF cluster is intended exclusively for teaching purposes or for scientific
work within the National Center for Biomolecular Research.
The rules for using the computer network of Masaryk University:
https://is.muni.cz/auth/do/mu/Uredni_deska/Predpisy_MU/Masarykova_univerzita/Smernice_MU/SM10-17/
The WOLF cluster is expressly prohibited for use for:
➢ downloading illegal content (copyrighted work, etc.)
➢ sending viruses, spam, and similar materials
➢ breaking the protection of other computers
➢ read, delete, or change the unprotected contents of other users' files
The login name and password form the identity of the user and therefore
we do not share it with third parties, we do not store or send it (e.g., by email)
in unencrypted form!
C2110 UNIX and programming Lesson 1 / Module 3 -8Rules
of Usage ...
It is also expressly forbidden on the WOLF cluster:
➢ run tasks on the front node (wolf.ncbr.muni.cz)
➢ run tasks anywhere in the home directory (especially data-intensive
tasks)
➢ run tasks on workstations during lessons (unless allowed by the
teacher)
Longer-time tasks must be run using a batch system.
More information in C2115 Practical introduction to supercomputing.
C2110 UNIX and programming Lesson 1 / Module 3 -9Cluster
Administrators
Before contacting the administrator, consult your problem with your colleague, teacher or
supervisor. If you do not resolve the issue, report the problem to the administrators (LCC
Support) by e-mail to
support@lcc.ncbr.muni.cz
In the report, note:
➢ Problem description, command name
➢ Username, machine name
➢ Copy of error output (complete from command entry)
Details:
https://einfra.ncbr.muni.cz -> User Support
C2110 UNIX and programming Lesson 1 / Module 3 -10Exercise
1
Prepare a suitable login name and password that you will use to access the WOLF cluster.
Choose the login name with the knowledge that it is also an account in the national EInfrastructure
(e.g., you will use the same login details when registering to MetaCentrum ).
Please note that the login name cannot be changed after registration. The password must
be strong.
1. Create an account on a WOLF cluster. Account creation is requested here:
https://wolf.ncbr.muni.cz
Group application 'students 2020/2021'
Account management
Your identity and student status will be verified before completing the application. Select
Masaryk University for authentication, your identity will then be verified against the MU
Information System. The application itself has TWO parts. The first part is the formal
registration to the virtual organization NCBR@MUNI. The second part then registration to
the group students.
An account will be created on the WOLF cluster
within approximately two hours of the
administrator approving the application.
C2110 UNIX and programming Lesson 1 / Module 3 -11Choosing
a Password
➢ The password should be strong enough. It should contain a combination of letters
(lowercase and uppercase), numbers, and special characters.
➢ When entering the password, we do not use the numeric part of the keyboard, special
keys and switches except the Shift key. This avoids the problem of entering the password
on other computers.
The default keyboard on a WOLF cluster is English (EN).
C2110 UNIX and programming Lesson 1 / Module 3 -12Change
Password
The standard command to change the password in the linux environment is a command
passwd (man passwd). However, it cannot be used on a WOLF cluster due to the use of an
external Perun user account manager (https://perun.cesnet.cz).
To change the password (or reset the password in case you forgot it) you must use the
administrator eINFRA profile. More information can be found here:
https://einfra.ncbr.muni.cz -> e-INFRA profile