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ALICE Grid tutorial certificate session

This tutorial outlines the step-by-step process for obtaining and using a certificate for ALICE Grid. Firstly, navigate to the designated web address to apply for personal certificates, ensuring to use the same browser throughout the process. After receiving an email notification, download your certificate using the same browser, and follow instructions to export necessary PEM files. Moreover, register on ALICE VO and configure AliEn access correctly on your machine. Detailed steps are provided to ensure a smooth experience in working with ALICE Grid.

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ALICE Grid tutorial certificate session

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  1. ALICE Grid tutorialcertificate session Kilian Schwarz

  2. a) How to get a certificate • Go via web browser to: • https://gridka-ca-sec.fzk.de/ • Chose „persönliche Zertifikate“ (or the corresponding thing in English) • And apply for a certificate • NOTE: • Make sure you remember what browser you used on what machine • For picking up the certificate you need to use exactly the same browser since your private key will be stored there

  3. b) Receiving your certificate • You would get an e-mail notification with a link to follow associated with a given password • Download the certificate via the same browser you used for application • Export your certificate (with private key) to some local file (*.p12) on your computer • Extract pem files using openssl: • openssl pkcs12 -in my_new_cert.p12 -nocerts -out userkey.pem (remember PEM phrase) • openssl pkcs12 -in my_new_cert.p12 -nokeys -out usercert.pem • chmod 400 userkey.pem

  4. c) Registration in ALICE VO • Go via web browser to: • http://alien.cern.ch/twiki/bin/view/Alice/UserRegistration • Follow steps 1-4 • Your certificate should still be in the browser from the application process

  5. d) AliEn access • At GSI: • . .alienv217login (only on Debian Etch) • put your certificates in $HOME/.alien/globus as usercert.pem and userkey.pem (permission 0600) • Elsewhere: • Install and configure an AliEn client following the instruction in: • http://alien2.cern.ch/index.php?option=com_content&view=article&id=44:clientinstall&catid=3&Itemid=101 • Do • alien proxy-init • alien-token-init • alien

  6. e) AliEn access from ROOT • At GSI: • . .alienv217rootlogin • alien proxy-init • alien-token-init • source /tmp/gclient_env_$UID • . alilogin v4-18-16-AN (or other version) • root –b • Root:>TGrid::Connect("alien://") • Root:>TFile *f2 = TFile::Open("alien:////alice/sim/2007/LHC07c/pp_minbias/8256/999/Kinematics.root") (as an example) • Elsewhere: • Initialise your own ROOT/AliRoot/AliEn environment beforehand

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