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Updated rgmanager packages that fix several bugs and add an enhancement are now available for Red Hat Enterprise Linux 6.
The rgmanager packages contain the Red Hat Resource Group Manager, which provides the ability to create and manage high-availability server applications in the event of system downtime.
- Previously, rgmanager incorrectly called the rg_wait_threads() function during cluster reconfiguration. This could lead to an internal deadlock in rgmanager which caused the cluster services to become unresponsive. This irrelevant call has been removed from the code and deadlocks now no longer occur during cluster reconfiguration.
- When enabling a service using the clusvcadm command with the "-F" option, rgmanager did not update the service owner information before responding to clusvcadmn. Consequently, clusvcadm could print incorrect information about which cluster node the service was running on. This update modifies rgmanager to update the owner information prior to responding to clusvcadm, and the command now provides the correct information.
- Under certain circumstances, a "stopped" event could be processed after a service and its dependent services had already been restarted. This forced the dependent services to restart erroneously. This update allows rgmanager to ignore the "stopped" events if dependent services have already been started, and the services are no longer restarted unnecessarily.
- Resource Group Manager did not handle certain inter-service dependencies correctly. Therefore, if a service was dependent on another service that was running on the same cluster node, the dependent service became unresponsive during the service failover and remained in the recovering state. With this update, rgmanager has been modified to check a service state during failover and stop the service if it is dependent on the service that is failing over. Resource Group Manager then tries to start this dependent service on other nodes as expected.
- The "-F" option of the clusvcadm command allows rgmanager to start a service according to failover domain rules. This option was not previously described in the command's manual pages. With this update, the "-F" option has been properly documented in the clusvcadm(8) manual page.
- Previously, if a newly added service failed to start on the first cluster node, rgmanager could try to relocate the service to another cluster node before the cluster configuration was updated on that node. Consequently, the service was set to the "recovering" state and had to be manually re-enabled in order to start. This update modifies rgmanager to retry the relocation process until after the cluster configuration has been updated on the node. The service can now be relocated as expected.
- Due to an invalid pointer dereference, rgmanager could terminate unexpectedly with a segmentation fault when central processing mode was enabled on a cluster node. With this update, the pointer dereference has been corrected, and rgmanager no longer crashes when central processing mode is enabled.
- Previously, in central processing mode, rgmanager failed to restart services that depended on a service that failed and was recovered. With this update, during the recovery of a failed service, any services that depend on it are restarted.
- This update introduces a feature which enables rgmanager to utilize Corosync's Closed Process Group (CPG) API for inter-node locking. This feature is automatically enabled when Corosync's Redundant Ring Protocol (RRP) feature is enabled. Corosync's RRP feature is considered fully supported. However, when used with the rest of the High-Availability Add-Ons, it is considered a Technology Preview.
Users are advised to upgrade to these updated rgmanager packages, which fix these bugs and add this enhancement.