Installation guide

This document includes a new appendix, Appendix D, Cluster Service Resource Check and Failover
Timeout. This appendix describes how rg manager monitors the status of cluster resources, and
how to modify the status check interval. The appendix also describes the __enforce_ti meo uts
service parameter, which indicates that a timeout for an operation should cause a service to fail.
This document includes a new section, Section 2.3.3, “ Configuring the iptables Firewall to Allow
Cluster Components” . This section shows the filtering you can use to allow multicast traffic
through the i ptabl es firewall for the various cluster components.
In addition, small corrections and clarifications have been made throughout the document.
1.1.3. New and Changed Feat ures for Red Hat Ent erprise Linux 6.3
Red Hat Enterprise Linux 6.3 includes the following documentation and feature updates and
changes.
The Red Hat Enterprise Linux 6.3 release provides support for the co nd o r resource agent. For
information on HA resource parameters, refer to Appendix B, HA Resource Parameters.
This document includes a new appendix, Appendix F, High Availability LVM (HA-LVM).
Information throughout this document clarifies which configuration changes require a cluster
restart. For a summary of these changes, refer to Section 9.1, “Configuration Changes Do Not
Take Effect” .
The documentation now notes that there is an idle timeout for lu ci that logs you out after 15
minutes of inactivity. For information on starting lu ci, refer to Section 3.2, “ Starting lu ci” .
The fence_i pmi l an fence device supports a privilege level parameter. For information on fence
device parameters, refer to Appendix A, Fence Device Parameters.
This document includes a new section, Section 2.14, “Configuring Virtual Machines in a Clustered
Environment” .
This document includes a new section, Section 4.6, “ Backing Up and Restoring the luci
Configuration” .
This document includes a new section, Section 9.4, “Cluster Daemon crashes” .
This document provides information on setting debug options in Section 5.14.4, “Logging” ,
Section 7.7, “Configuring Debug Options” , and Section 9.13, “ Debug Logging for Distributed
Lock Manager (DLM) Needs to be Enabled” .
As of Red Hat Enterprise Linux 6.3, the root user or a user who has been granted lu ci
administrator permissions can also use the lu ci interface to add users to the system, as
described in Section 3.3, “ Controlling Access to luci” .
As of the Red Hat Enterprise Linux 6.3 release, the ccs command validates the configuration
according to the cluster schema at /usr/share/cl uster/cluster. rng on the node that you
specify with the -h option. Previously the ccs command always used the cluster schema that was
packaged with the ccs command itself, /usr/share/ccs/cl uster. rng on the local system.
For information on configuration validation, refer to Section 5.1.6, “ Configuration Validation” .
The tables describing the fence device parameters in Appendix A, Fence Device Parameters and
the tables describing the HA resource parameters in Appendix B, HA Resource Parameters now
include the names of those parameters as they appear in the cl uster. co nf file.
In addition, small corrections and clarifications have been made throughout the document.
Red Hat Ent erprise Linux 6 Clust er Administ rat ion
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