C2110 UNIX and programming Lesson 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 3
PS / 2020 Distance form of teaching: Rev3
C2110 UNIX and programming Lesson 3 -2-
Revision
➢ Kerberos
➢ Documentation (manual pages)
➢ File System
➢ Copying Remote File
C2110 UNIX and programming Lesson 3 -3-
Workflow
PC
node02
node03 nodeXX
login between cluster nodes
without having to re-enter the password
with password (your local account)
with password (eINFRA for the WOLF cluster)
without password for the period of validity of
krb5 tickets(the password is
entered each time)
PC
kinit or equivalent
(password required once)
A) Default state for your personal computers regardless of OS.
B) Recommended mode for your personal computers (see
homework) regardless of OS.
C) WOLF cluster (where PC is a cluster node), personal computer
with Linux OS (recommended configuration for serious work),
details C2115
PC
(pam_krb5)
A)
B)
C)
!!! In an environment that uses krb authentication, ssh keys are NOT RECOMMENDED !!!
WOLF cluster
C2110 UNIX and programming Lesson 3 -4Command
Help
Manuals sites (or what to do, when I get lost):
man lists manual page of given command
$ man [section_number] stoker
Available sections:
❑ Section 1 user commands
❑ Section 2 system calls
❑ Section 3 library functions
❑ Section 4 special files
❑ Section 5 file formats
name of command, function, topic, chapter etc.
❑ Section 6 games
❑ Section 7 conventions and miscellany
❑ Section 8 administration and privileged commands
❑ Section L math library functions
❑ Section N tcl functions
C2110 UNIX and programming Lesson 3 -5File
System on the WOLF cluster
wolf01
/scratch
wolf02
/scratch
wolf03
/scratch
wolf04
/scratch
/home
........
Shared content on all nodes of the WOLF cluster.
Data are backed up. Backups are available in
form of snapshots in the directory
/backup/<date>/WOLF/wolf.ncbr.muni.cz/home
Capacity per user is limited by quota 1.5 GB.
Different content on each node.
Data on volume /scratch up are not backed up
and can be deleted at any time without prior
notice.
Capacity is not limited by quota per user.
C2110 UNIX and programming Lesson 3 -6Remote
Access
user
local session
user
local session
Remote Access (ssh, putty)
Remote File Transfer (scp, WinSCP)
web server
Remote File Transfer
(wget)
C2110 UNIX and programming Lesson 3 -7Next
Subject
➢ Basic Work with Linux
C2110 UNIX and programming Lesson 3 -8-
Content
➢ Processes
• process, multitasking, monitoring
• process startup, PATH variable
• signály
➢ Communication of Process with Environment
• standard input and output, error output, redirection
• pipes, commands
➢ Virtualization
• what is virtualization, typical use, overview of hypervisors,
installation of Ubuntu OS