Difference: SystemAdministratorGuideForEMI1 (44 vs. 45)

Revision 452011-11-02 - RobertoRosendeDopazo

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META TOPICPARENT name="SystemAdministratorDocumentation"

System Administrator Guide for CREAM for EMI-1 release

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1 Installation and Configurationf

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1 Installation and Configuration

 

0.1 Prerequisites

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  If you plan to use LSF as batch system for your CREAM CE, you have to install and configure it before installing and configuring the CREAM software. Since LSF is a commercial software it can't be distributed together with the middleware.
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If you plan to use SGE as batch system for your CREAM CE, it will be installed and configured along with the middleware (i.e. you don't have to install and configure it in advance)
 

0.1 Plan how to deploy the CREAM CE

0.1.1 CREAM CE and gLite-cluster

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  • a gLite-CLUSTER node
  • multiple CREAM CEs configured in cluster mode
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It is then also possible to define a DNS alias to refer to the set of CREAM head nodes: after the initial contact from outside clients to the CREAM-CE alias name for job submission, all further actions on that job are based on the jobid which contains the physical hostname of the CREAM-CE to which the job was submitted. This allows to switch the DNS alias in order to distribute load.
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It is then also possible to define a DNS alias to refer to the set of CREAM head nodes: after the initial contact from outside clients to the CREAM-CE alias name for job submission, all further actions on that job are based on the jobid which contains the physical hostname of the CREAM-CE to which the job was submitted. This allows to switch the DNS alias in order to distribute load.
  The alias shouldn't be published in the information service, but should be simply communicated to the relevant users.
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There are various techniques to change an alias entry in the DNS. The choice depends strongly on the way the network is set up and managed. For example at DESY a self-written service called POISE is used; using metrics (which take into account in particular the load and the sandbox size ) it decides the physical instance the alias should point to. Another possibility to define aliases is to use commercial network techniques such as F5.
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There are various techniques to change an alias entry in the DNS. The choice depends strongly on the way the network is set up and managed. For example at DESY a self-written service called POISE is used; using metrics (which take into account in particular the load and the sandbox size ) it decides the physical instance the alias should point to. Another possibility to define aliases is to use commercial network techniques such as F5.
  It must be noted that, as observed by Desy sysadmins, the proliferation of the aliases (C-records) is not well defined among DNS'. Therefore changes of an alias sometimes can take hours to be propagated to other sites.
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 yum install emi-lsf-utils
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  • If you are running SGE, install the emi-ge-utils metapackage:
yum install emi-ge-utils
 

0.0.1 Installation of a CREAM CE node in cluster mode

First of all, install the yum-protectbase rpm:

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 yum install emi-lsf-utils
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  • If you are running SGE, install the emi-ge-utils metapackage:
yum install emi-ge-utils
 

0.0.0.1 Installation of the cluster metapackage

If the CREAM CE node has to host also the glite-cluster, install also this metapackage:

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  /opt/glite/yaim/bin/yaim -c -s <site-info.def> -n creamCE -n LSF_utils
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  • Configuration of a CREAM CE in no cluster mode using SGE as batch system
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     /opt/glite/yaim/bin/yaim -c -s <site-info.def> -n creamCE -n SGE_utils 
 

0.0.1 Configuration of a CREAM CE node in cluster mode

0.0.1.1 Install host certificate

 
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