Instructions for installing and configuring the LCG information providers
(used by CEMon)
=========================================================================

The following information are needed to properly install and configure the
LCG information providers (used by CEMon).

They basically replace the instructions for the configuration of:

      /opt/glite/etc/glite-ce-ce-plugin/glite-ce-parameters.cfg
      /opt/glite/etc/glite-ce-ce-plugin/ce-static.ldif


1- Install on the CE node the following RPMs:

    lcg-info-templates
    lcg-info-generic
    lcg-info-dynamic-pbs  (just for PBS CE)
    lcg-info-dynamic-lsf (just for LSF CE)
    lcg-info-dynamic-condor (just for Condor CE)

    They can all be found at:

         http://lfield.home.cern.ch/lfield/gip/rpms/


2- Create and properly fill the configuration file:
  
       /opt/glite/etc/glite-ce-ce-plugin/lcg-info-generic.conf
   
   Please refer to the examples files  
   (lcg-info-generic.conf.example.pbs for a PBS CE, and 
   lcg-info-generic.conf.example.lsf for a LSF CE) installed 
   in the directory /opt/glite/etc/glite-ce-ce-plugin, 
   by the glite-ce-ce-plugin RPM.
    
   At the beginning of this file there are first of all some definitions, 
   i.e.:

ldif_file=/opt/glite/etc/glite-ce-ce-plugin/out.ldif
generic_script=/opt/lcg/libexec/lcg-info-generic
wrapper_script=/opt/glite/etc/glite-ce-ce-plugin/lcg-info-wrapper
dynamic_script=/opt/lcg/libexec/lcg-info-dynamic-pbs /opt/glite/etc/glite-ce-ce-plugin/lcg-info-generic.conf lxb2077.cern.ch
temp_path=/opt/glite/tmp
template=/opt/lcg/etc/GlueCE.template
template=/opt/lcg/etc/GlueCESEBind.template


  - ldif_file refers to a static ldif file that will be later created

  - generic_script shouldn't be changed wrt the value in the example files

  - wrapper_script refers to the script that will be later created, and which
      will be invoked by the CEMon software: the value for this attribute
      shouldn't be changed wrt the value in the example files

  - dynamic script for a PBS CE should be:


     dynamic_script=/opt/lcg/libexec/lcg-info-dynamic-pbs \
     <path-name-of-conf-file> <hostname>

     e.g.:

     dynamic_script=/opt/lcg/libexec/lcg-info-dynamic-pbs /opt/glite/etc/glite-ce-ce-plugin/lcg-info-generic.conf lxb2077.cern.ch

  - dynamic script for a LSF CE should be:


     dynamic_script=/opt/lcg/libexec/lcg-info-dynamic-lsf \
     <path-name-of-LSF-commands> <path-name-of-conf-file>

     e.g.:

     dynamic_script=/opt/lcg/libexec/lcg-info-dynamic-lsf /usr/local/lsf/bin /opt/glite/etc/glite-ce-ce-plugin/lcg-info-generic.conf

  - dynamic script for a Condor CE should be:


     dynamic_script=/opt/lcg/libexec/lcg-info-dynamic-condor \
     <path-name-of-Condor-commands> <path-name-of-conf-file> [central manager]

     e.g.:

     dynamic_script=/opt/lcg/libexec/lcg-info-dynamic-condor /usr/local/condor/bin /opt/glite/etc/glite-ce-ce-plugin/lcg-info-generic.conf

  - temp_path refers to a directory where some temp files are created
    This directory should be readable and writable to the user running
    tomcat (i.e. tomcat4)

  - template shouldn't be changed wrt the values in the example files
    

    After these definitions, what follows is a representation (in LDIF) 
    of the CE information: these are static attributes (that can not be 
    calculated dynamically by the info provider) or default values used 
    if there is an error running the info provider.


3 - Execute:
     /opt/lcg/sbin/lcg-info-generic-config \
      /opt/glite/etc/glite-ce-ce-plugin/lcg-info-generic.conf

    This will create the file <ldif_file> (i.e. 
    /opt/glite/etc/glite-ce-ce-plugin/out.ldif) and the file 
    <wrapper_script> (i.e.  
    /opt/glite/etc/glite-ce-ce-plugin/lcg-info-wrapper).
    The first one must be readable and the second one must be executable
    to the user running tomcat (i.e. tomcat4)


4 - Issue:

     ln -fs  <wrapper_script> \
       /opt/glite/etc/glite-ce-ce-plugin/glite-ce-info 

     i.e.:

     ln -fs /opt/glite/etc/glite-ce-ce-plugin/lcg-info-wrapper  \
       /opt/glite/etc/glite-ce-ce-plugin/glite-ce-info