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Errata

-                      v3
+                      v4
 == Deploying OS Errata ==
+Errata deployment is controlled through variable `PKG_DEPLOY_OS_ERRATA`. By default, to avoid any problem at a site, errata deployment is disabled. But sites are '''strongly''' encouraged to define this variable to `true` to enable errata deployment. The most usual places to define this variables are `source:templates/trunk/clusters/example-3.1/site/cluster-info.tpl site/cluster-info.tpl] to control it at a cluster level or in [source:templates/trunk/sites/example/site/config.tpl site/config.tpl]  in your site-specific templates to control it at the site level. It is recommended to define a default value (using operator `?= `) to allow further redefinition in a node profile.
+When enabled, OS errata deployment will use a template `rpms/errata.tpl` in the templates for the OS version used on a specific node. This default name can be changed using variable `PKG_OS_ERRATA_TEMPLATE` to define the template to use. It is '''strongly recommended''' to use a non default name to avoid any clash with the `errata.tpl` provided by the standard templates. This also allows to produce a different template for a different version of the errata (using the date in the template name for example) with a finer control over what is deployed when on which machine.