The Databar System at DTU
September2013
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2
TheDatabarSystematDTU
Authors: Henrik Madsen, Bernd Dammann, Mark Gjøl, Povl Ole
Haarlev Olsen,JørnVillesenChristensen,KarenMarkvardMartensen,
Christian Theede, Christian Thode Larsen, Jakob Rosenkrantz
deLassonandAnderslaCourBentzon.
WithcontributionsfromJoakimC.Allerup.
TranslatedfromDanishbyJoySueChristensen.
ThisdocumentwastypesetwithLAT
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X.
Version:
September3,2013
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Contents
3
Contents
1 Introduction
4
2 Databarsystem
4
2.1 Thephysicaldatabars. . . . . . . . . . . . . . . . . . . . . . . . .
4
2.2 Useofmobiledevices. . . . . . . . . . . . . . . . . . . . . . . . .
4
3 DTUPortalandCampusNet
6
4 Supportandhelpdesk
6
5 ThinLincremotelogin
6
6 TheG-Bar
7
6.1 Loginandlogout . . . . . . . . . . . . . . . . . . . . . . . . . . .
8
6.2 Userinterfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9
6.3 Browsers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.4 E-mailande-mailclients . . . . . . . . . . . . . . . . . . . . . . . 11
6.5 UNIXandthefilesystem. . . . . . . . . . . . . . . . . . . . . . . 12
6.6 G-Barsoftware. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.7 Printers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.8 Networkcommands . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.9 Jobprocessing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
7 TheWinbar
23
7.1 Documents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.2 InstallationofsoftwareintheWinbar . . . . . . . . . . . . . . . 24
7.3 Formatting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.4 Printers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.5 Scanners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7.6 UNIXfromWinbar . . . . . . . . . . . . . . . . . . . . . . . . . . 25
8 Linux
26
8.1 Linuxprograms . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
9 MacatDTU
26
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4
TheDatabarSystematDTU
1 Introduction
The purpose of this guideis to introduce new users to the databar system
atDTUandprovidebasicinformationabouttheG-Databar
1
andtheWinbar.
Furthermore,Section3describestheuniversityportal(intranet)andCampus-
net(the informationcenter whichcovers the DTU curriculum). Tokeep all
thisinformationcompactandoverseeableforyou,manyinstancesbelowre-
fertofurtherdetailsavailableattheG-Barwebsite:http://www.gbar.dtu.dk
andattheWinbarwebsite:http://www.winbar.dtu.dk. Anoverviewofthe
databarsatDTUcanbefoundathttp://www.databar.dtu.dk.
2 Databarsystem
TheobjectivesofthedatabarsystematDTUaretomakethefullrangeofap-
plicationsandcomputerpoweravailabletostudentsandresearchersregard-
ingthecurriculum,writingandcomputingneedsinconnectionwithresearch,
workprojects,andotherstudyactivities.
2.1 Thephysicaldatabars
TheDTUdatabarsystemconsistsofanumberofdatabarsspreadontheDTU
area,seeTable1onthefacingpage. Themaponthelastpageofthisguide
showsthelocationofthesedatabars. Terminalsandprinterscanbeaccessed
fromthedatabars,andsinceallofthedatabarsareconnectedwithinthesame
system,itispossibletoaccessone’sownfilesatanyofthem.
Alldatabarsmustconformwithcertainrequirementsofthenetworkpro-
gramandsoftwarewhichmakesitpossibletoconnectthedatabars,andwhich
ensuresthatatleasttheminimumofsoftwareisaccessibleeverywhere.
IntheUNIX and Linux databars, you have the possibility to connect to
aWindowsDesktop(RemoteDesktop)
2
. Similarily,youcanstartaUNIXor
LinuxdesktopintheWindowsdatabars(ThinLinc).
2.2 Useofmobiledevices
Providedthatyouhaveawirelessnetworkadaptorinyourmobilecomputer,
youcanuseyourownmobiledeviceasathinclient
3
(theUNIXsystem).After
installingaThinLincclient(describedinSection5onpage6)youcanuseyour
mobiledevicejustlikeanyotherthinclientoncampus.
1
G-DatabarisalsocalledG-Bar
2
Formoreinformation,gotohttp://www.gbar.dtu.dk/wiki/Windows_FAQ
3
ThethinclientsaretheterminalsthatareavailableforuseintheG-Barandinsomeofthe
otherdatabars.Seetable1.
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2 Databarsystem
5
Databar
Building
Typeofdatabar
Numberofworkstations
B-Bar
116
Windowsdatabar
135
DiplomE-andIT-Bar
308
Winbar
45
325
Winbar
84
E-Bar
341
Winbar/Linux
78
325
168
G-Bar
303N
UNIX/Linux
96
(SunRayterminals)
305
UNIX/Linux
30
306
UNIX/Linux
48
308
UNIX/Linux
72
K-Bar
208
Winbar
27
208
UNIX
22
210
Winbar
60
M-Bar
402
Windowsdatabar
24
414
Windowsdatabar
40
421
Windowsdatabar
53
VR-Bar
305
Windows
25
101-Databar
101
Winbar
84
Table1:Buildingswithdatabarworkstations
To access the internet and computing servers in the G-Bar through the
wireless net, we recommend that you use eduroam. Theeduroamnetwork
isthefree,wirelessnetwork oftheuniversitiesforthestudentsand theem-
ployees. With eduroam you will also be able to access the wireless net of
other universities in Denmark and abroad. However, the configuration of
eduroamdependsonoperatingsystem(Windows,Linux, MacOS),andyou
may havetoinstall aprograminorder toaccess thewirelessnetworkwith
eduroam. Formoreinformationoneduroam,pleaseconsulttheG-Bar wiki
(http://www.gbar.dtu.dk/wiki/eduroam).
Alternatively, youcanusethe netcalled“dtu”. Inordertoauthenticate,
you will need to enter your credentials every time you log on to this wire-
lessnetwork,whichisquitecumbersome.“dtu”isalsonotencrypted,which
meansthatpeoplecaneavesdroponyourcommunicationandhijackforexam-
pleyourFacebookaccount.Forthesereasons,werecommendusingeduroam
instead.Formoreinformationonthewirelessnetworks,pleaseseewww.wire-
less.dtu.dk.
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6
TheDatabarSystematDTU
3 DTU PortalandCampusNet
DTU’swebportalathttp://portalen.dtu.dk/ providesanindex of thein-
formationthatisavailabletoallDTUstudentsandemployees.Thereyoucan
alsoreadcampusnews,confirmwhichcoursesyouareregisteredfor,discover
informationgroups,andfindotherusefulnotesandtips.Theportalfunctions
asafrontpageforCampusNet,too.
CampusNetgivesyouaccesstonumerousstudy-relatedfunctionsanddata.
Forexample,thisiswhereyouregisterforcoursesorcancelacourseregistra-
tion. Youcanlocateother studentshere,andoftenyouwillfinddiscussion
groupsrelatedtoparticularcourses. Itisalsopossibletoaccessyourstudent
e-mailanddownloadfreesoftwareatCampusNet.
IfyouwanttogodirectlytoCampusNetwithoutgoingthroughthepor-
tal,youcanusethisweb address: http://www.campusnet.dtu.dk/,oreven
shorter:http://cn.dtu.dk.
4 Supportandhelpdesk
If youneedtechnical supportwithanyoftheIT systems at DTU,you may
writetoitsupport@student.dtu.dk.Thisisagenerice-mailaddress,andthe
supporterswilltakecareofforwardingyourrequesttotherightpeople—no
matter ifyourquestionisabouttheWinbar,theG-Bar,theK-Baretc. Please
beas specific as possible withyour support question; themore details you
provideupfront,thelessthesupporterswillhavetoaskyouafterwards,and
thefasteryourproblemcanbesolved.
Alternatively,youmayvisittheG-Barsupport office, whichislocatedin
building308,room119(phonenumber51265). TheyhelpwithG-Barissues,
includingproblems that you might have connecting to DTUfroma mobile
deviceorhomecomputer.Theycanalsohelpoutifyouhavetroubleinstalling
course-specificsoftwareonLinuxorWindowscomputers.Theopeninghours
canbeseenathttp://www.gbar.dtu.dk.
If youhave forgottenyour password, you willhave tohaveto visit the
studentofficeinbuilding101withavalidIDinordertogetanewone.
5 ThinLinc remotelogin
ItispossibletologintotheG-BarfromyourhomeorthroughtheDTUWire-
lessNetwork. Sitting atyour computer anywhere, youcanmakeuseofthe
G-Bar computingpoweraswellasthelargeselectionofprograms. Forthis
purpose, theG-Barrecommendsandsupportstheproduct ThinLincoffered
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6 TheG-Bar
7
ThinLincisaclientthat combinestechnologiessuchasSSHandVNCto
support remotegraphical login. For those whomightnotfully understand
whatthisis,itmeansthata“window”appearsinyourcomputerwhichstarts
aterminalsessionjustasifyouwereworkingataG-Barterminal.
TheThinLincclientcanbedownloadedfreelyathttp://www.gbar.dtu.dk/
softwareforusewithLinux,Mac,orWindows.
Whentheinstallationiscomplete,theprogramstartswiththecommand
tlclientonaLinuxterminalorbyclickingontheThinLinciconinWindows.
Theprogramshouldbringupthefollowingscreenwhereyouthenenteryour
ownserveraddress,username,andpassword.
Figure1:Thinlincclientlogin
• Server:thinlinc.gbar.dtu.dk
• Name:yourstudentaccountnumber
• Password:yourDTUpassword
After that you areready to connect, and you do that by clicking on the
buttonLogin. NowyouselectauserinterfacethesamewayasintheG-Bar,
andyouareonline.
ItisalsopossibletologontotheG-BarfromtheWinbarmachines,which
alsoofferaccessthroughThinLinc. Youcanfindmoreinformationaboutset-
tingupaThinLincclientontheG-Barhomepage.
6 TheG-Bar
TheG-Bar architectureat DTUisanup-to-dateUNIX-based(Solaris, Linux)
computersystem.ThereisaclusterofcentralcomputingserversintheG-Bar,
thatareconnectedtoapoolofSunRayservers(grayNN).TheSunRay-servers
8
TheDatabarSystematDTU
makeaccesstoallthemanySunRayterminalsintheG-Barsystempossible,
sopleasedonotstartaprogramonthisserver. Instead,programsshouldbe
runontheso-calledapplicationservers,whicharenamedn-62-14-NN.These
arebasedonLinux.Programsthatarestartedfromthegraphicalenvironment
willalwaysrunontherightservers,soit’sonlynecessarytobeawareofthis
ifoneisrunningprogramsdirectlyfromaterminal(e.g.,throughssh).
ConnectedwiththeG-Bar are also anumber of computers whichare re-
served foruserscategorizedastheHPCgroup(HighPerformanceComput-
ing). Fordetailsonthataccessanduse,gotohttp://www.cc.dtu.dk/?page_
id=12.
6.1 Loginandlogout
6.1.1 Login
TologintotheG-Bar,youfirstkeyinyourusername(sometimesalsocalled
your login or user ID). Typically, it is your student number in this form:
s001234. Afterkeyinginyourusernameandpressingtheenterkey,thesys-
temwillaskforyourpassword.
Note: Whenyoukeyinyour password, nothing shows inthepassword
box—Notevenalineofasterisks(*).Thisisasecurityfeaturewhichprevents
anyonestandingnearyoufromseeinghowlongyourpasswordis.
Onceyouhaveenteredyourpasswordandyouhaveclickedonok,youare
loggedin.
ThedatabarsatDTUareallconnected,soyouhavethesameusernameand
passwordatalldatabars.Unlessexplicitlyspecifiedotherwise,thatpassword
ismeant,wheneversuchisrequired.
If you havea smartcard, you canlog injust byinsertingthecard. You
canpurchaseasmartcardattheIMMInformationDeskinBuilding321for40
Danishkroner.Formoreinformationaboutsmartcards,seetheG-Barwebsite.
6.1.2 Graphicaluserinterface
Whatyouseewhenyouhaveloggedintothesystemisagraphicaluserinter-
face(GUI).ThedefaultGUIisIceWM.Ifyouprefertouseadifferentgraphical
userinterface,youcanmakethatselectionwhenloggingin.Todoso,clickon
“Options”! “Session” intheloginscreen. However, IceWM is the recom-
mendedGUI.
Inthevariousgraphicaluserinterfaces,mostprogramscanbestartedfrom
thecentralmenu(seeSection6.2onthefacingpage).
Unixterminals UNIXterminalsgiveyoucommandorienteduseofthesys-
tem. Manyusersprefer this because after abit of practicethey havefaster
andmoreeffectiveuseofthesystemwhenaccessingitthisway.Furthermore,
6 TheG-Bar
9
somecommandsandprogramscanonlybeaccessedthroughaterminal. Ter-
minalscanbeopenedfromthecentralmenu.
6.1.3 Changingyourpassword
Thepasswordcanbechangedbyvisitingthewebsitehttps://password.dtu.dk.
Pleasebeawarethatitmaytakeafewhours(sometimesuptoaday)beforethe
newpasswordhaspropagatedtoallofDTU’scomputersystems.Ifyournew
passworddoesn’tworkimmediately,pleasetryagainlaterbeforecontacting
ITsupport.
6.1.4 Logout
Whenyouarefinishedusingthesystem,youhavetologout.Dothisbyclick-
ingonthemenubuttonLogout.Ifyouareusingasmartcard,youare“logged
out”assoonasyouremovethecard.
Beforeyoulogout,itisimportantthatyoushutdownlargeprogramssuch
asinternetbrowsers,e-mailprograms,OpenOffice,Maple,MatlabandSplus.
Ifyoudonotclosetheprogramsyouusedbeforeloggingout,youwillkeep
thesystemresourcesandlicensesoccupiedunnecessarily.
6.2 Userinterfaces
TouseUNIXterminalsisthemostefficientwaytowork,butmanypreferthe
graphicaldisplaybecauseworkismoreintuitivewithvisualaccess.
6.2.1 Centralmenu
ThereisacommonmenuthatopensallG-Bargraphicalenvironments,andit
ismaintainedcentrally. Thatmenucantypicallybeactivatedbyaclickofthe
middleortherightmousebuttononthebackgroundofthedisplay. Mostof
theprogramsinstalledontheG-Barcanbestartedfromthismenu. Whena
programisactivatedfromthecentralmenu,itwillbeprocessedbytheserver
whichisrunningwiththelightestloadatthatmoment.
6.2.2 Filebrowser
TheG-Baroffersamulti-taskingfilemanager(filebrowser),calledXFE.You
caneitherstartXFEinaterminalwiththecommandxfeorinthemenuunder
“DesktopEnvironment”.Formoreinformation,seetheG-Barhomepage.
6.2.3 IceWM
Thegraphicalenvironment(or window manager) recommended for useon
theG-BarisIceWM(seeFig.2onthenextpage).Thiswindowmanagerlooks
10
TheDatabarSystematDTU
andworkssomewhatlikeMicrosoftWindows. JustlikeMicrosoftWindows,
themenu openswitha clickona menubar at thebottomleft cornerofthe
display.
Figure2:IceWM
Windows WithIceWMyoucan’drag-and-drop’windowslikethedesktop
environmentofMicrosoftWindows. Placethecursoronthemenubaratthe
topofthewindow,thenclicktheleftmousebuttonandholditdownwhile
youmovethewindowtoanewposition.Thewindowsizecanbechangedby
clickingonanysideofthewindowanddrawingitinoroutward.
IceWMwindowshavethesamethreebuttonsthatMicrosoftwindowshave
ontherightsideofthetopmenubar. Alsohere,theouterrightbuttoncloses
thewindow,thebuttoninthemiddlemaximizesit,andtheleftbuttonofthese
threeminimizesthewindow.OntheleftsideoftheIceWMtopmenubarthere
isanotherbutton.Clickingonthisonegivesyouamenuofthingsyoucando
withthewindow. Youcanbring upthe samelist with a rightclick on any
emptyspaceinthetopbar. TocloseanIceWMwindow,youdoubleclickon
thebuttonattheleftofthetopmenubar.
IceWM offersseveralfunctions that Windows does not have. Unlike in
MicrosoftWindows,itispossibletorollthewindowupsothatonlythetop
menubar remains visible, and the window’spositioncanbeadjustedwith
respect toother openwindowsonthedesktop. WithIceWMawindowcan
alsobemovedtoanotherdesktop. YoucandothatwiththecommandMove
tointhewindowmenu(leftbuttononthetopbar).
Youcangetalistofopenwindowsbyclickingonthebackgroundwiththe
middlebuttonofthemouse. Thelistdifferentiatesbetweenthedesktopsyou
arecurrentlyusing.
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