Basic aliensh S Bagnasco INFN Torino CNAF Nov

Basic aliensh S. Bagnasco, INFN Torino CNAF Nov 27 -28, 2007

Preparing the certificates Certificates should be stored under $HOME/. globus Globus enforces privacy on your private key! (chmod 400) Stefano Bagnasco - INFN Torino INFN Grid School for Users - CNAF Nov 27 -28, 2007 - 2 /3475

Changes in environment Stefano Bagnasco - INFN Torino INFN Grid School for Users - CNAF Nov 27 -28, 2007 - 3 /3475

Getting a GRID proxy Authentication command (default is the local username) Happens every 24 hours Put certificate password Stefano Bagnasco - INFN Torino INFN Grid School for Users - CNAF Nov 27 -28, 2007 - 4 /3475

Getting an Ali. En token Stefano Bagnasco - INFN Torino INFN Grid School for Users - CNAF Nov 27 -28, 2007 - 5 /3475

Authentication problems I Globus related: Permissions on $HOME/. globus/userkey. pem are not private to the user • chmod 400 userkey. pem Your certificate authority is exotic and not known to the server. Your certificate has expired. Clock skew: • • Your local computer time is in the future with respect to the server's time. Your local computer time is more in the past than the certificate life time. Stefano Bagnasco - INFN Torino INFN Grid School for Users - CNAF Nov 27 -28, 2007 - 6 /3475

Authentication problems II alien-token-init related: You have not gone through all 5 steps of the Ali. En user registration. You have not given the Ali. En user name as an argument to the token-init command your local user name is not identical to the Ali. En user name. The script wants to bootstrap the installation but you don’t have write permissions on the installation path • Avoid bootstrapping by setting the GSHELL_ROOT environment variable. API servers are not working… Stefano Bagnasco - INFN Torino INFN Grid School for Users - CNAF Nov 27 -28, 2007 - 7 /3475

Try it out! Upload your certificates to your machines: Store them under e. g: /afs/cern. ch/user/t/trn 2301/. globus/ Check that the key file is read only. Get a valid alien token. If asked if you want to compile the gapi and xrootd libs answer YES (everything is already precompiled) Stefano Bagnasco - INFN Torino INFN Grid School for Users - CNAF Nov 27 -28, 2007 - 8 /3475

Accessing the shell Message of the day. Standard bash shell with grid comands Main bash features are available. Not all shell helper programs are available. Some local commands (like ls, cat etc) are overwritten with the corresponding GRID commands. File/path tab completion in the virtual GRID directory. Stefano Bagnasco - INFN Torino INFN Grid School for Users - CNAF Nov 27 -28, 2007 - 9 /3475

Shell Basic commands I Tab completion working!!! Stefano Bagnasco - INFN Torino INFN Grid School for Users - CNAF Nov 27 -28, 2007 - 10 /3475

Shell Basic commands II Stefano Bagnasco - INFN Torino INFN Grid School for Users - CNAF Nov 27 -28, 2007 - 11 /3475

Shell Basic commands III Stefano Bagnasco - INFN Torino INFN Grid School for Users - CNAF Nov 27 -28, 2007 - 12 /3475

whereis command Stefano Bagnasco - INFN Torino INFN Grid School for Users - CNAF Nov 27 -28, 2007 - 13 /3475

Viewing files I Stefano Bagnasco - INFN Torino INFN Grid School for Users - CNAF Nov 27 -28, 2007 - 14 /3475

viewing files II Stefano Bagnasco - INFN Torino INFN Grid School for Users - CNAF Nov 27 -28, 2007 - 15 /3475

Editing files Define your preferred editor via the variable EDITOR: 'emacs' 'emacs -nw' 'xemacs -nw' 'pico' 'vi' (DEFAULT) 'vim' The file is temporary in /tmp on your local disk and then is uploaded once you exit the editor! Stefano Bagnasco - INFN Torino INFN Grid School for Users - CNAF Nov 27 -28, 2007 - 16 /3475

Clean up old versions Stefano Bagnasco - INFN Torino INFN Grid School for Users - CNAF Nov 27 -28, 2007 - 17 /3475

Copying out files GOLDEN RULE If you want to access your local directory structure while you are in the shell you should start by having the prefix “file: ” e. g: cp file: /home/pchrist/gshell. sh Stefano Bagnasco - INFN Torino INFN Grid School for Users - CNAF Nov 27 -28, 2007 - 18 /3475

File catalogue structure The path name will be: for ‘real’ data: /data/<Year>/<Accelerator. Period>/<Run. Number>/ for simulated data: /sim/<Year>/<Production. Type>/<Run. Number>/ Subdirectories will be called: Raw/ cond/ reco/<Pass. X>/ESD/ reco/<Pass. X>/AOD/ … File names will look like this: <xxxx>. Ali. ESD. root For further information see: http: //indico. cern. ch/conference. Display. py? conf. Id=3280 http: //cern. ch/Oldenburg/Meta. Data. doc Stefano Bagnasco - INFN Torino INFN Grid School for Users - CNAF Nov 27 -28, 2007 - 19 /3475

Querying the File Catalogue aliensh: [alice] [1] find -x pp /alice/cern. ch/user/p/pchrist/Tutorial/PDC 06/* *Merged*tag. root > pp. xml Redirect the output to the xml collection. Stefano Bagnasco - INFN Torino INFN Grid School for Users - CNAF Nov 27 -28, 2007 - 20 /3475

Querying the File catalogue aliensh: [alice] [1] find -x pp /alice/data/2008/LHC 08 a/*/reco/Pass 3/* *Merged*tag. root Run: collision_system=”pp” and Run: stop<"2008 -03 -20 10: 20: 33" and Run: start>"2008 -03 -19" > pp. xml Stefano Bagnasco - INFN Torino INFN Grid School for Users - CNAF Nov 27 -28, 2007 - 21 /3475

Try it out I Access the alien shell and try some simple commands: Check your user name by typing ‘whoami’. List the contents of your home directory. Print the working directory. Create the following directory structure in your Ali. En space: $HOME/bin (if it is not there) $HOME/Grid. School Get the information of the file with ‘whereis’: /alice/cern. ch/user/s/sbagnasc/Grid. School. Nov 2007. tgz Stefano Bagnasco - INFN Torino INFN Grid School for Users - CNAF Nov 27 -28, 2007 - 22 /3475

Try it out II Copy the Ali. En file /alice/cern. ch/user/s/sbagnasc/Grid. School/Grid. Tutorial. November 2007. tgz to your local $HOME/Grid. School Exit the shell and unpack the file locally by typing: tar xvzf Grid. School. Nov 2007. tgz Enter again the shell and register: The. csh files in your Ali. En $HOME/bin The. jdl files in your Ali. En $HOME/Grid. School Try the -v option! Stefano Bagnasco - INFN Torino INFN Grid School for Users - CNAF Nov 27 -28, 2007 - 23 /3475

Try it out i. II Play with the ‘find’ command: Access the shell again and query the f. c. and get all the tag files (*. tag. root) under: /alice/sim/2007/LHC 07 c/pp_minbias/8268/* Get the output on your terminal (find /alice/…) Get the output on your terminal in a xml format (find -x tag /alice/…) Redirect the results to the tag. xml collection: the output will not be stored in your Ali. En working directory but rather in your local working directory. Repeat the previous exercise limiting the number of output files to 5 (find -l 5. . . ). Stefano Bagnasco - INFN Torino INFN Grid School for Users - CNAF Nov 27 -28, 2007 - 24 /3475

Tomorrow Whatever is left over from today… Write a JDL to generate some file Submit the job and check its progress Check the job’s output Write a JDL to look at the output Submit it to run wherever the file is Get the result If there is some time left, do the same actually generating MC events and reconstructing them, or even analyzing some PDC data… Stefano Bagnasco - INFN Torino INFN Grid School for Users - CNAF Nov 27 -28, 2007 - 25 /3475