Setting up a gLite WMS

Notes for installing a gLite WMS on CentOS 3

About

The gLite Workload Management System is a replacement for the old LCG Resource Broker.

The current version is 2.4.4 (RPM glite-WMS-2.4.4) and it's installed with YAIM 3.1 on a CentOS 3 machine. A version for CentOS 4 is in the works.

Summary

The installation went smoothly, with only the 'boost' and 'boost-devel' packages needed from SLC. Some care was required because a dedicated 'glite' account will be created, with a default homedir of /home/glite.

Getting started

Installing the packages can be done with APT-RPM, a port of the Debian package manager to SL. It can be installed from http://glitesoft.cern.ch/scientific/30rolling/i386/apt-rpm/RPMS.os/apt-0.5.15cnc6-4.SL.i386.rpm

After installing APT, you need to configure several apt sources for various repositories:

• CentOS 3
• LCG-CA
• gLite-WMSLB
• JPackage 1.6
• SLC (ouch!)

the respective sources.lists are:

rpm http://linuxsoft.cern.ch/ LCG-CAs/current production
rpm http://www.dutchgrid.nl/mirror/apt/centos 3/i386 os updates
rpm http://glitesoft.cern.ch/EGEE/gLite/APT/R3.0/glite-WMSLB rhel30 externals Release3.0 updates
rpm http://www.dutchgrid.nl/mirror/jpackage 1.6/generic free
rpm http://www.dutchgrid.nl/mirror/jpackage 1.6/redhat-el-3.0 free
rpm http://linuxsoft.cern.ch  cern/slc30X/i386/apt os updates extras

doing an

apt-get update && apt-get install lcg-CA && apt-get install glite-WMSLB

after that should install the middleware. This will pull in glite-yaim-core, glite-yaim-lb and glite-yaim-wms as well.

The list of installed packages.

Configuring the middleware

Install the host cert and key, prepare gridmapdir and such. Install the VOMS server cert in /etc/grid-security/vomses.

Using YAIM, the configuration can be done provided a good site-info.def file is prepared. The yaim command line then is:

/opt/glite/yaim/bin/yaim -c -s site-info.def -n glite-WMS -n glite-LB

A dedicated account for glite is being made (config_edgusers). The host key and cert are copied to ~glite/.certs. The default location is /home/glite and if you don't like that set

GLITE_USER_HOME=/preferred/glite/home/dir

in site-info.def. Make sure gridmapdir is writable by glite.

A bug in yaim (GGUS ticket 27609) hardcodes /home/glite (scripts config_glite_lb and config_glite_lbproxy) for GLITE_HOST_CERT and GLITE_HOST_KEY. Update: This has now been fixed.

Usage hints

The UI commands for job submission all start with glite-wms-. These are similar to the good old edg- commands, with some slight differences. In fact, you could probably get away with the following aliases:

alias edg-job-list-match='glite-wms-job-list-match -a'
alias edg-job-submit='glite-wms-job-submit -a'
alias edg-job-status='glite-wms-job-status'
alias edg-job-get-logging-info='glite-wms-job-get-logging-info'
alias edg-job-cancel='glite-wms-job-cancel'
alias edg-job-get-output='glite-wms-job-output'

A subtle difference with retrieving output is the --dir option; the edg tools would create a unique subdirectory in the given directory, so --dir=. would work nicely. But the new tools drop the output directly in the given directory. Using --dir=. results in a warning that the directory already exists.

The preferred form of proxy delegation is by using glite-wms-job-delegate-proxy:

glite-wms-job-delegate-proxy -d <my_favorite_handle>

and subsequently referring to the handle in the other commands:

glite-wms-job-submit -d <my_handle> <jdl_file>

Links

gLite WMS troubleshooting guide

https://twiki.cern.ch/twiki/bin/view/LCG/GLiteWMSTroubleshooting

gLite WMS release notes

https://twiki.cern.ch/twiki/bin/view/EGEE/Glite30WMSCHKPTProd

Generic installation guide

https://twiki.cern.ch/twiki/bin/view/LCG/GenericInstallGuide301

YAIM guide

https://twiki.cern.ch/twiki/bin/view/LCG/YaimGuide311