Virtualized gLite services

There are several projects that are using or aiming to use VMs for running gLite services. This is a list of such projects.

  • Xen-strap (http://www.gridpp.ac.uk/wiki/Xen-strap, http://www.gridpp.ac.uk/wiki/Glite-UI-on-SL4)
  • gLite testing (Andreas Unterkircher).
  • INFN-GRID (Leonello Servoli) are developing high-availability gLite services with failover VMs. VM state is kept in network block devices, and if one service, VM or hardware fails, then the VM is continued on a different physical machine. They use cfengine for configuration automation and nagos for monitoring.

Running gLite services in Xen VMs is straight forward. There are some points worth mentioning:

  • By default, the hwclock in a Xen domain is read-only, and can cause problems with ntp.
  • Software updates may cause /lib/tls to be overwritten.
  • At least one IP address should be allocated per domain, or IP setup can be quirky.
OS images with gLite services for use with Xen can be created at http://cern.ch/osfarm
A static list of images can be found here: http://project-xen.web.cern.ch/project-xen/xen/img/img.xml

-- Main.hbjerke - 19 Jan 2007

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Topic revision: r5 - 2008-01-16 - MarianKLEIN
 
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