Notes about Installation and Configuration of a CREAM Computing Element using Torque as batch system and ARGUS as authorization method

O.S. and Repos

• Starts from a fresh installation of Scientific Linux 5.x (x86_64).

# cat /etc/redhat-release 
Scientific Linux SL release 5.7 (Boron) 

* Install the additional repositories: EPEL, Certification Authority, UMD

# yum install yum-priorities yum-protectbase
# cd /etc/yum.repos.d/
# rpm -ivh http://mirror.switch.ch/ftp/mirror/epel//5/x86_64/epel-release-5-4.noarch.rpm
# wget http://repo-pd.italiangrid.it/mrepo/repos/egi-trustanchors.repo
# rpm -ivh http://repo-pd.italiangrid.it/mrepo/EMI/1/sl5/x86_64/updates/emi-release-1.0.1-1.sl5.noarch.rpm
# wget http://repo-pd.italiangrid.it/mrepo/repos/igi/sl5/x86_64/igi-emi.repo

• Be sure that SELINUX is disabled (or permissive). Details on how to disable SELINUX are here:

# getenforce 
Disabled

• Check the repos list (sl-*.repo are the repos of the O.S. and they should be present by default).

# ls /etc/yum.repos.d/
egi-trustanchors.repo  
emi1-third-party.repo emi1-base.repo emi1-updates.repo
igi-emi.repo
epel.repo epel-testing.repo  
sl-contrib.repo sl-fastbugs.repo sl-security.repo sl-testing.repo sl-debuginfo.repo sl.repo sl-srpms.repo

IMPORTANT: remove the dag repository if present

yum install

# yum clean all
Loaded plugins: downloadonly, kernel-module, priorities, protect-packages, protectbase, security, verify, versionlock
Cleaning up Everything

# yum install ca-policy-egi-core
# yum install xml-commons-apis
# yum install emi-cream-ce
# yum install emi-torque-server emi-torque-utils
# yum install glite-dgas-common glite-dgas-hlr-clients glite-dgas-hlr-sensors glite-dgas-hlr-sensors-producers yaim-dgas
# yum install nfs-utils

see here for details

vo.d directory

Create the vo.d directory for the VO configuration file (you can decide if keep the VO information in the site.def or putting them in the vo.d directory)

# mkdir vo.d

here an example for some VOs.

Information about the several VOs are available at the CENTRAL OPERATIONS PORTAL.

users and groups configuration

here an example on how to define pool accounts (ig-users.conf) and groups (ig-groups.conf) for several VOs

wn-list.conf

Set in this file the WNs list, for example:

# less wn-list.conf 
wn01.cnaf.infn.it
wn02.cnaf.infn.it
wn03.cnaf.infn.it
wn04.cnaf.infn.it

site-info.def

SUGGESTION: use the same site-info.def for CREAM and WNs: for this reason in this example file there are yaim variable used by CREAM, TORQUE or emi-WN.

It is also included the settings of some VOs

For your convenience there is an explanation of each yaim variable. For more details look at [8, 9, 10]

services/glite-creamce

#
# YAIM creamCE specific variables
#

# LSF settings: path where lsf.conf is located
#BATCH_CONF_DIR=lsf_install_path/conf
#
# CE-monitor host (by default CE-monitor is installed on the same machine as 
# cream-CE)
CEMON_HOST=$CE_HOST
#
# CREAM database user
CREAM_DB_USER=*********
#
CREAM_DB_PASSWORD=*********
# Machine hosting the BLAH blparser.
# In this machine batch system logs must be accessible.
#BLPARSER_HOST=set_to_fully_qualified_host_name_of_machine_hosting_blparser_server
BLPARSER_HOST=$CE_HOST

services/dgas_sensors

#
# YAIM DGAS Sensors specific variables
#


################################
# DGAS configuration variables #
################################
# For any details about DGAS variables please refer to the guide:
# http://igrelease.forge.cnaf.infn.it/doku.php?id=doc:guides:dgas

# Reference Resource HLR for the site.
DGAS_HLR_RESOURCE="prod-hlr-01.pd.infn.it"

# Specify the type of job which the CE has to process.
# Set ”all” on “the main CE” of the site, ”grid” on the others.
# Default value: all
#DGAS_JOBS_TO_PROCESS="all"

# This parameter can be used to specify the list of VOs to publish.
# If the parameter is specified, the sensors (pushd) will forward
# to the Site HLR just records belonging to one of the specified VOs.
# Leave commented if you want to send records for ALL VOs
# Default value: parameter not specified
#DGAS_VO_TO_PROCESS="vo1;vo2;vo3..."


# Bound date on jobs backward processing.
# The backward processing does not consider jobs prior to that date.
# Default value: 2009-01-01.
#DGAS_IGNORE_JOBS_LOGGED_BEFORE="2011-11-01"

# Main CE of the site.
# ATTENTION: set this variable only in the case of site with a “singleLRMS”
# in which there are more than one CEs or local submission hosts (i.e. host
# from which you may submit jobs directly to the batch system).
# In this case, DGAS_USE_CE_HOSTNAME parameter must be set to the same value
# for all hosts sharing the lrms and this value can be arbitrary chosen among
# these submitting hostnames (you may choose the best one).
# Otherwise leave it commented.
# we have 2 CEs, cremino is the main one
DGAS_USE_CE_HOSTNAME="cremino.cnaf.infn.it"

# Path for the batch-system log files.
# * for torque/pbs:
# DGAS_ACCT_DIR=/var/torque/server_priv/accounting
# * for LSF:
# DGAS_ACCT_DIR=lsf_install_path/work/cluster_name/logdir
# * for SGE:
# DGAS_ACCT_DIR=/opt/sge/default/common/
DGAS_ACCT_DIR=/var/torque/server_priv/accounting

# Full path to the 'condor_history' command, used to gather DGAS usage records
# when Condor is used as a batch system. Otherwise leave it commented.
#DGAS_CONDOR_HISTORY_COMMAND=""

---+++ host certificate
# ll /etc/grid-security/host*
-rw-r--r-- 1 root root 1440 Oct 18 09:31 /etc/grid-security/hostcert.pem
-r-------- 1 root root  887 Oct 18 09:31 /etc/grid-security/hostkey.pem

munge configuration

IMPORTANT: The updated EPEL5 build of torque-2.5.7-1 as compared to previous versions enables munge as an inter node authentication method.

• verify that munge is correctly installed:

# rpm -qa | grep munge
munge-libs-0.5.8-8.el5
munge-0.5.8-8.el5

• On one host (for example the batch server) generate a key by launching:

# /usr/sbin/create-munge-key

# ls -ltr /etc/munge/
total 4
-r-------- 1 munge munge 1024 Jan 13 14:32 munge.key

• Copy the key, /etc/munge/munge.key to every host of your cluster, adjusting the permissions:

# chown munge:munge /etc/munge/munge.key

• Start the munge daemon on each node:

# service munge start
Starting MUNGE:                                            [  OK  ]

# chkconfig munge on

Verify to have set all the yaim variables by launching:

# /opt/glite/yaim/bin/yaim -v -s site-info_cremino.def -n creamCE -n TORQUE_server -n TORQUE_utils -n DGAS_sensors

see details

# /opt/glite/yaim/bin/yaim -c -s site-info_cremino.def -n creamCE -n TORQUE_server -n TORQUE_utils -n DGAS_sensors

see details

Software Area settings

If the Software Area is hosted on your CE, you have to create it and export to the WNs in the site.def we set:

VO_SW_DIR=/opt/exp_soft

• directory creation

mkdir /opt/exp_soft/

• edit /etc/exports creating a line like the following:

/opt/exp_soft/ *.cnaf.infn.it(rw,sync,no_root_squash)

• check nfs and portmap status

# service nfs status
rpc.mountd is stopped
nfsd is stopped

# service portmap status
portmap is stopped

# service portmap start
Starting portmap:                                          [  OK  ]

# service nfs start
Starting NFS services:                                     [  OK  ]
Starting NFS daemon:                                       [  OK  ]
Starting NFS mountd:                                       [  OK  ]
Starting RPC idmapd:                                       [  OK  ]

# chkconfig nfs on
# chkconfig portmap on

• after any modification in /etc/exports you can launch

# exportfs -ra

or simply restart nfs daemon

walltime workaround

If on the queues there is published:

GlueCEStateWaitingJobs: 444444

and in the log /var/log/bdii/bdii-update.log you notice errors like the folllowing:

Traceback (most recent call last):
  File "/usr/libexec/lcg-info-dynamic-scheduler", line 435, in ?
    wrt = qwt * nwait
TypeError: unsupported operand type(s) for *: 'NoneType' and 'int'

probably the queues have no "resources_default.walltime" parameter configured.

So define it for each queue by launching, for example:

# qmgr -c "set queue prod resources_default.walltime = 01:00:00"
# qmgr -c "set queue cert resources_default.walltime = 01:00:00"
# qmgr -c "set queue cloudtf resources_default.walltime = 01:00:00"

• After service installation to have a look if all were installed in a proper way, you could have a look to Service CREAM Reference Card
• You can also perform some checks after the installation and configuration of your CREAM

TORQUE checks:

• check the pbs settings:

# qmgr -c 'p s'

• check the WNs state

# pbsnodes -a

maui settings

In order to reserve a job slot for test jobs, you need to apply some settings in the maui configuration (/var/spool/maui/maui.cfg)

Suppose you have enabled the test VOs (ops, dteam and infngrid) on the "cert" queue and that you have 8 job slots available. Add the following lines in the /var/spool/maui/maui.cfg file:

CLASSWEIGHT 1
QOSWEIGHT 1

QOSCFG[normal] MAXJOB=7

CLASSCFG[prod] QDEF=normal
CLASSCFG[cert] PRIORITY=5000

After the modification restart maui.

In order to avoid that yaim overwrites this file during the host reconfiguration, set:

CONFIG_MAUI="no"

in your site.def (the first time you launch the yaim script, it has to be set to "yes"