CE+WN+siteBDII Installation and configuration The EPIKH Project (Exchange Programme to advance e-Infrastructure Know-How) CE+WN+siteBDII Installation and configuration Riccardo Rotondo (riccardo.rotondo@ct.infn.it) National Institute of Nuclear Physics Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators Cairo, 19.10.2010 www.epikh.eu

Outline Computing Element overview Worker Node overview CE CREAM overview gLite stack overview gLite CE cream and siteBDII Installation on CE and WN Configuration on CE and WN Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

gLite stack overview Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

gLite overview worker node Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

glite overview User Interface: it’s the point of access for users to glite grid services WMS: it’s the component that optimize resource usage. CE: the machine who manage worker nodes WN: the machines who actually execute applications SE: machines where files are stored LFC: used to “find” files on the grid BDII: services responsible to publish all info of your sites Logging and Bookkeping: as it’s name says it’s a logger and alert user when job is finisched Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

Computing Element Overview Computing Element provides some of main services of a site. Main functionalities: job management (job submission, job control) job status updated for WMS Usually installed together with the site BDII service that publishes all information regarding the computing element It can runs several kinds of batch system: Torque + MAUI LSF SGE Condor On of computing elements’ main task, fase? Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

Torque + MAUI Torque server service: Torque client service: pbs_server provides basic batch services such as receiving/creating a batch job. Torque client service: psb_mom places jobs into execution. It’s is also responsible for returning job’s output to the user. MAUI system service: job_scheduler contains site’s policy to decide which job is going to be executed and when. subito Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

Site BDII* By default it was installed on CE but now it’s better to install it on a dedicated server, physical or virtual. It collect all site GRISes* (for example SE,RB,LFC,etc...) Service is named bdii Log file: /opt/bdii/var/bdii.log rara, acronimo *BDII = Berkeley Database Information Index **GRIS = Grid Resouce Information Service Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

Worker Node Element Overview They are machines which really execute your job. User can only access their services by a Computing Element. Their characteristics are collected by Computing Element that publishes all information by BDII services Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

CE Cream overview Computing Resource Execution And Management Accept job submission requests belonging from a WMS and other job management request. It exposes a web services interface interrogare query Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

Requirements Three or more machine: Architecture: 64 bit One will be used to perform CE installation; One will be used to perform site BDII installation; Others will be used to perform WN installation; Architecture: 64 bit Operating System: Scientific Linux 5 Two machine with a public ip address, direct and reverse address resolution on a DNS and equipped with an X509 certificate (for the CE and site BDII) variare Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

CE Cream and BDII Installation (on Torque/PBS) Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010 12

Network Time Protocol # date # /etc/init.d/ntpd status Let’s check if date’s machine is correct with: # date if ntp date isn’t correct # /etc/init.d/ntpd status # ntpdate ntp-1.infn.it if not let’s configure file and make service start on boot: # /etc/init.d/ntpd start # chkconfig ntpd on Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

Repository set up # cd /etc/yum.repos.d/ Add to system repository ones specific for middleware to install # cd /etc/yum.repos.d/ # mv dag.repo dag.repo.stop # REPO="dag ig glite-generic lcg-ca glite-cream_torque glite-bdii" # for rep_name in $REPO; do wget http://server1.eun.eg/mrepo/repo/sl5/x86_64/$rep_name.repo; done Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

Which metapackages we are going to install? There are several kinds of metapackages to install: lcg-CA LHC Computing Grid rpm collection to support external Certification Authority . ig_cream_torque INFNGRID Compunting Element CREAM and torque services rpm. ig_BDII INFNGRIF BDII services rpm. Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

Middleware component installation Use yum to install needed packets # yum clean all # yum install -y lcg-CA # yum install -y ig_CREAM_torque # yum install -y ig_BDII Sometimes it’s necessary add manually metapackage profiles which include middleware components # yum install -y xml-commons-apis Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

Before configuration Some preliminary steps before configuration: copy host certificate in default path: # cd # mv SRVXX.eun.eg/SRVXX.eun.eg-cert.pem /etc/grid-security/hostcert.pem # mv SRVXX.eun.eg/SRVXX.eun.eg-key.pem /etc/grid-security/hostkey.pem # chmod 400 /etc/grid-security/hostkey.pem # chmod 600 /etc/grid-security/hostcert.pem Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

Before configuration/2 generate configurations file from YAIM template # cd /opt/glite/yaim/examples/; mkdir mysite-conf # cp -r wn-list.conf ig-users.conf ig-groups.conf siteinfo/vo.d/ siteinfo/services/ siteinfo/ig-site-info.def mysite-conf/ # cd mysite-conf/ # mv ig-site-info.def my-ig-site-info.def Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

YAIM configuration Main file to edit is my-ig-site-info.def, where you specify some general settings and other component’s parameters (CE Cream) Other file to be edited are: wn-list.conf, ig-groups.conf, services/glite-creamce, services/ig-bdii_site Set variables with corrected values replacing example ones. # vim services/glite-creamce CEMON_HOST=${CE_HOST} CREAM_DB_USER="cream_db_user" CREAM_DB_PASSWORD="cream_pass" BLPARSER_HOST=${CE_HOST} Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

YAIM configuration/2 # vim services/glite-bdii_site SITE_DESC=”Egypt Grid Site CE"SITE_SUPPORT_EMAIL=prod_mail@yourdomain.it SITE_SECURITY_EMAIL=sec_mail@yourdomain.it SITE_LOC=”Cairo, Egypt” SITE_OTHER_GRID="WLCG|EGEE|EUMED" BDII_REGIONS="CE" BDII_CE_URL="ldap://$CE_HOST:2170/mds-vo-name=resource,o=grid" Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

YAIM configuration/3 # vim wn-list.conf ### Delete all example values present SRVXX.eun.eg #insert worker nodes hostname Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

YAIM configuration/4 Here some settings to support AFRICACERT VO: # vim vo.d/africacert SW_DIR=$VO_SW_DIR/africacertDEFAULT_SE=$SE_HOSTSTORAGE_DIR=$CLASSIC_STORAGE_DIR/africacertVOMS_SERVERS="'vomss://voms.ct.infn.it:8443/voms/africacert?/africacert'"VOMSES="'africacert voms.ct.infn.it 15004 /C=IT/O=INFN/OU=Host/L=Catania/CN=voms.ct.infn.it africacert'"VOMS_CA_DN="'/C=IT/O=INFN/CN=INFN CA'" Then install the VO voms certificates with: wget http://grid018.ct.infn.it/mrepo/cometa_sl4-i386/RPMS.app/cometa-vomscert-1.0-3.noarch.rpm rpm –ivh cometa-vomscert-1.0-3.noarch.rpm Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

YAIM configuration/5 Now you have to provide a group and some users for AFRICACERT VO modifying this two files: ig-groups.conf ig-users.conf # vim ig-groups.conf # Append following lines to the end of file "/africacert/ROLE=SoftwareManager":::sgm: "/africacert"::::- Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

YAIM configuration/6 # vim ig-users.conf #append this line at the end of the file 39001:africacert001:3900:africacert:africacert:: 39002:africacert002:3900:africacert:africacert:: 39003:africacert003:3900:africacert:africacert:: 39004:africacert004:3900:africacert:africacert:: 39005:africacert005:3900:africacert:africacert:: 39006:africacert006:3900:africacert:africacert:: 39007:africacert007:3900:africacert:africacert:: 39008:africacert008:3900:africacert:africacert:: 39009:africacert009:3900:africacert:africacert:: 39010:africacert010:3900:africacert:africacert:: 39011:africacert011:3900:africacert:africacert:: 39012:africacert012:3900:africacert:africacert:: 39013:africacert013:3900:africacert:africacert:: 39014:africacert014:3900:africacert:africacert:: 39015:africacert015:3900:africacert:africacert:: 39016:africacert016:3900:africacert:africacert:: 39017:africacert017:3900:africacert:africacert:: 39018:africacert018:3900:africacert:africacert:: 39019:africacert019:3900:africacert:africacert:: 39020:africacert020:3900:africacert:africacert:: 39101:sgmafricacert001:3910,3900:sgmafricacert,africacert:africacert:sgm: 39102:sgmafricacert002:3910,3900:sgmafricacert,africacert:africacert:sgm: 39103:sgmafricacert003:3910,3900:sgmafricacert,africacert:africacert:sgm: Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

YAIM configuration/7 In my-ig-site-info.def there are many variables to set: # vim my-ig-site-info.def WN_LIST=/opt/glite/yaim/examples/mysite-conf/wn-list.conf USERS_CONF=/opt/glite/yaim/examples/mysite-conf/ig-users.conf GROUPS_CONF=/opt/glite/yaim/examples/mysite-conf/ig-groups.conf MYSQL_PASSWORD=good_mysql_pass # any password you want SITE_EMAIL="mail1@test" SITE_NAME=EG-01-ERI SITE_LAT=30.04 SITE_LONG=31.21 Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

YAIM configuration/8 # vim my-ig-site-info.def CE_HOST=SRVXX.eun.eg # substitute with hostname machine CE_CPU_MODEL=XEON #cat /proc/cpuinfo CE_CPU_VENDOR=Intel CE_CPU_SPEED=2230 CE_OS=ScientificSL CE_OS_RELEASE=5.5 #cat /etc/redhat-release CE_OS_VERSION="Boron" CE_OS_ARCH=x86_64 CE_MINPHYSMEM=512 #cat /proc/meminfo on WN CE_MINVIRTMEM=512 CE_PHYSCPU=1 #total cpu in site (dual dual core) CE_LOGCPU=4 CE_SMPSIZE=4 CE_OUTBOUNDIP=TRUE CE_INBOUNDIP=FALSE Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

YAIM configuration/9 CE_RUNTIMEENV=" LCG-2 LCG-2_1_0 LCG-2_1_1 # vim my-ig-site-info.def CE_RUNTIMEENV=" LCG-2 LCG-2_1_0 LCG-2_1_1 LCG-2_2_0 LCG-2_3_0 LCG-2_3_1 LCG-2_4_0 LCG-2_5_0 LCG-2_6_0 LCG-2_7_0 GLITE-3_0_0 GLITE-3_1_0 GLITE-3_2_0 R-GMA SI00MeanPerCPU_3800 SF00MeanPerCPU_3800 " CE_SI00=3800 CE_SF00=3800 Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

YAIM configuration/10 # vim my-ig-site-info.def CE_CAPABILITY="CPUScalingReferenceSI00=23.75" CE_OTHERDESCR="Cores=4,Benchmark=6.5-HEP-SPEC06" SE_MOUNT_INFO_LIST="${INT_HOST_SW_DIR}:/opt/exp_soft,/opt/exp_soft" Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

YAIM configuration/11 How to set CE_SI00, CE_SF00, CE_CAPABILITY, CE_OTHERDESCR ? Try to search for you value in thris link: http://www.italiangrid.org/grid_operations/site_manager/HEP- SPEC06 https://hepix.caspur.it/benchmarks/doku.php?id=bench:results_sl5_x86_64_gcc_4 12 https://hepix.caspur.it/processors/dokuwiki/doku.php?id=benchmarks:results For example if you have an Intel XEON 5520 2.23 GHz with no Hyper Threading will find in the table of previous link a value of 95 and a conversion factor of 1HS06=40 so: CE_SI00 = 3800 CE_SF00 = 3800 CE_CAPABILITY="CPUScalingReferenceSI00=3800” CE_OTHERDESCR="Cores=4,Benchmark=23.75-HEP-SPEC06” Where (3800/40)/4= 23.75 Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

YAIM configuration/12 # vim my-ig-site-info.def BATCH_SERVER=SRVXX.eun.eg JOB_MANAGER=pbs CE_BATCH_SYS=pbs BATCH_LOG_DIR=/var/spool/pbs APEL_DB_PASSWORD="anything" DGAS_ACCT_DIR=/var/spool/pbs/server_priv/accounting VOS="africacert eumed infngrid ops dteam" QUEUES="cert eumed grid" CERT_GROUP_ENABLE="ops dteam africacert" EUMED_GROUP_ENABLE="eumed" GRID_GROUP_ENABLE="infngrid" Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

YAIM configuration/14 After editing you can launch command: # /opt/glite/yaim/bin/ig_yaim -c -s my-ig-site-info.def -n ig_CREAM_torque # /opt/glite/yaim/bin/ig_yaim -c -s my-ig-site-info.def -n ig_BDII_site Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

Fixing errors ONLY IF TOMCAT IS STOPPED TRY THIS SOLUTION: Check tomcat running after configuration, if you get this message:: # /etc/init.d/tomcat5 status/etc/init.d/tomcat5 is stopped ONLY IF TOMCAT IS STOPPED TRY THIS SOLUTION: # rm -fr /var/lib/tomcat5/common/lib/jakarta* # /etc/init.d/tomcat5 start Starting tomcat5: /usr/bin/rebuild-jar-repository: error: Could not find log4j Java extension for this JVM/usr/bin/rebuild-jar-repository: error: Some detected jars were not found for this jvm [ OK ] Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

WN Cream Installation (on Torque/PBS) Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010 33

WN - Network Time Protocol Let’s check if date’s machine is correct with: # date if ntp date isn’t correct # /etc/init.d/ntpd status # ntpdate ntp-1.infn.it if not let’s configure file and make service start on boot: # /etc/init.d/ntpd start # chkconfig ntpd on Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

WN - Repository set up (by CNAF repo) Add to system repository ones specific for middleware to install # cd /etc/yum.repos.d/ # mv dag.repo dag.repo.stop# REPO="dag ig glite-generic lcg-ca glite-wn_torque"# for rep_name in $REPO; do wget http://server1.eun.eg/mrepo/repo/sl5/x86_64/$rep_name.repo; done Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

Which metapackages we are going to install? There are several kinds of metapackages to install: lcg-CA LHC Computing Grid rpm collection to support external Certification Authority . ig_WN_torque_noafs INFNGRID Worker Node torque client in other to dialogue to torque server. We decide not to install afs file system. This metapackage is used with groupinstall option. Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

WN - Middleware component installation Use yum to install needed packets # yum clean all # yum install -y lcg-CA # yum groupinstall -y ig_WN_torque_noafs Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

WN - YAIM Configuration You can use same configuration file edited on CE: this can be done on all worker node of a site; so you don’t neet to re-edit anything! Copy file from CE machine: # cd /opt/glite/yaim/examples/ # scp -r root@SRVXX.eun.eg:/opt/glite/yaim/examples/mysite-conf . # cd mysite-conf Ready to configure now # /opt/glite/yaim/bin/ig_yaim -c -s my-ig-site-info.def -n ig_WN_torque_noafs Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

Testing installation Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010 39

Tests on CE SSH access to CE to test if CE can see WN and to test if all main service are up & running # pbsnodes SRVXX.eun.eg state = free np = 2 properties = lcgpro ntype = cluster status = opsys=linux,uname=Linux grid-test-63.trigrid.it 2.6.18-164.6.1.el5 #1 [cut] # /etc/init.d/gLite status*** tomcat5:/opt/glite/etc/init.d/tomcat5 is already running (1514)*** glite-lb-locallogger:glite-lb-logd runningglite-lb-interlogd running# /etc/init.d/globus-gridftp statusglobus-gridftp-server (pid 25452) is running... Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

Tests on CE SSH access to CE and then become a gilda user: # su – eumed001 Create a file and add the following: $ vi test.sh #!/bin/sh sleep 20 #(it's useful to see the job status) hostname Set right permission to be executable: $ chmod 700 test.sh Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

Tests on CE Launch job locally on CE $ qsub –q eumed test.sh Then check list of job in execution on CE $ qstat –a ce.localdomain: Req'd Req'd ElapJob ID Username Queue Jobname SessID NDS TSK Memory Time S Time--------------- -------- -------- ---------- ------ --- --- ------ ----- - ----3.wn.localdo gilda001 short test.sh 5839 -- -- -- 00:15 R -- In case you want to more info: $ qstat -f 3 In case you want to abort a job execution: $ qdel 3 #that is jobid Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

Tests on CE If typing “qstat -a” command you didn’t get no output, no jobs are being executed on CE and this means your previous job terminated so now you can list output. $ lstest.sh.e3 test.sh.o3 $ cat test.sh.e3 #error file$$ cat test.sh.o3 #output filewn.localdomain Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

JDL example $ vim hostname-cream.jdl Type = "Job"; JobType = "Normal"; Executable = "/bin/hostname"; StdOutput = "hostname.out"; StdError = "hostname.err"; OutputSandbox = {"hostname.err","hostname.out"}; Arguments = "-f"; OutputSandboxBaseDestUri = "gsiftp://localhost"; ShallowRetryCount = 3; Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

Working test SSH access to UI to test if CE can receive and execute simple job $ ssh cairoXX@glite-tutor.ct.infn.it #password: ceristuserXX $ voms-proxy-init --voms eumed [cut] [rotondo@genius ~]$ glite-ce-delegate-proxy -e SRVXX.eun.eg riccardo2010-06-29 02:36:21,683 WARN - No configuration file suitable for loading. Using built-in configuration2010-06-29 02:36:26,389 NOTICE - Proxy with delegation id [riccardo] succesfully delegated to endpoint [https://cerist44.grid.arn.dz:8443//ce-cream/services/gridsite-delegation] $[rotondo@genius ~]$ glite-ce-job-submit –r SRVXX.eun.eg:8443/cream-pbs-cert -D riccardo hostname-cream.jdl 2010-06-29 02:39:06,444 WARN - No configuration file suitable for loading. Using built-in configuration https://SRVXX.eun.eg:8443/CREAM501920532 $ glite-ce-job-status https://ceristXX.grid.arn.dz:8443/CREAM888739522****** JobID=[https://ceristXX.grid.arn.dz:8443/CREAM888739522] Status = [DONE-OK] ExitCode = [0] Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

Test on BDII ldapsearch is a very useful command to query the index $ ldapsearch -x -h sirius-ce.ct.infn.it -p 2170 -b "mds-vo-name=local, o=grid" # extended LDIF # # LDAPv3 # base <mds-vo-name=local, o=grid> with scope sub # filter: (objectclass=*) # requesting: ALL # local, grid dn: Mds-Vo-name=local,o=grid objectClass: GlueTop objectClass: Mds Mds-Vo-name: local # search result search: 2 result: 0 Success # numResponses: 2 # numEntries: 1 Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

Test on BDII If you want to have more and more info (with this resources it will be print a lof of info): $ ldapsearch -x -LLL -h sirius-se.ct.infn.it -p 2170 -b "mds-vo-name=resource, o=grid" Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

Which logs are supposed to be open if something goes wrong?: Troubleshooting Which logs are supposed to be open if something goes wrong?: /var/log/message, for general errors /opt/glite/var/log (especially glite- ce-cream.log) /var/spool/pbs/server_priv/account ing/<data>, if even local submission on batch system doesn’t work. Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

References INFNGRID generic installation guide: http://igrelease.forge.cnaf.infn.it/doku.php?id=doc:guides:install-3_2 YAIM configuration variables https://twiki.cern.ch/twiki/bin/view/LCG/Site-info_configuration_variables CE Cream installation guide: GLITE Cream CE 3.2 SL5 Installation Guide [INFNGRID Release Wiki] YAIM system administrator guide: https://twiki.cern.ch/twiki/bin/view/LCG/YaimGuide400 EUMEDGRID wiki: http://wiki.eumedgrid.eu/bin/view EuMedGRID sites installation and setup tips http://wiki.eumedgrid.eu/twiki/bin/view/InfrastructureStatus/EumedSiteInstallati on How To Check And Test Your CREAMCE http://grid.pd.infn.it/cream/field.php?n=Main.HowToCheckAndTestYourCREAM CE Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010

Thank you for your kind attention ! Any questions ? Cairo, Africa 4 2010 - Joint EUMEDGRID-Support/EPIKH School for Grid Site Administrators, 19.10.2010