User manual REDHAT ENTERPRISE LINUX 5 ADMINISTRATION

[. . . ] Red Hat Enterprise Linux 5 Cluster Administration Configuring and Managing a Red Hat Cluster Cluster Administration Red Hat Enterprise Linux 5 Cluster Administration Configuring and Managing a Red Hat Cluster Edition 4 Copyright © 2009 Red Hat Inc. . This material may only be distributed subject to the terms and conditions set forth in the Open Publication License, V1. 0 or later (the latest version of the OPL is presently available at http://www. opencontent. org/openpub/). Red Hat and the Red Hat "Shadow Man" logo are registered trademarks of Red Hat, Inc. All other trademarks referenced herein are the property of their respective owners. [. . . ] Deleting a cluster frees each node in the cluster for use in another cluster. When the action is complete, a page is displayed showing either of the following pages according to the action selected: 43 Chapter 4. Managing Red Hat Cluster With Conga · For Restart this cluster and Stop this cluster/Start this cluster -- Displays a page with the list of nodes for the cluster. · For Delete this cluster -- Displays the Choose a cluster to administer page in the cluster tab, showing a list of clusters. 4. 2. Managing Cluster Nodes You can perform the following node-management functions through the luci server component of Conga: · Make a node leave or join a cluster. To perform one the functions in the preceding list, follow the steps in this section. The starting point of the procedure is at the cluster-specific page that you navigate to from Choose a cluster to administer displayed on the cluster tab. At the detailed menu for the cluster (below the clusters menu), click Nodes. Clicking Nodes causes the display of nodes in the center of the page and causes the display of an Add a Node element and a Configure element with a list of the nodes already configured in the cluster. At the right of each node listed on the page displayed from the preceding step, click the Choose a task drop-down box. Clicking Choose a task drop-down box reveals the following selections: Have node leave cluster/Have node join cluster, Fence this node, Reboot this node, and Delete. The actions of each function are summarized as follows: · Have node leave cluster/Have node join cluster -- Have node leave cluster is available when a node has joined of a cluster. Selecting Have node leave cluster shuts down cluster software and makes the node leave the cluster. Making a node leave a cluster prevents the node from automatically joining the cluster when it is rebooted. Selecting Have node join cluster starts cluster software and makes the node join the cluster. Making a node join a cluster allows the node to automatically join the cluster when it is rebooted. · Fence this node -- Selecting this action causes the node to be fenced according to how the node is configured to be fenced. · Reboot this node -- Selecting this action causes the node to be rebooted. · Delete -- Selecting this action causes the node to be deleted from the cluster configuration. It also stops all cluster services on the node, and deletes the cluster. conf file from /etc/ cluster/. Select one of the functions and click Go. 44 Managing High-Availability Services 4. When the action is complete, a page is displayed showing the list of nodes for the cluster. 4. 3. [. . . ] To upgrade a Red Hat Cluster from RHEL 4 to RHEL 5, follow these steps: 1. Run service clvmd stop, if CLVM has been used to create clustered volumes. Note If clvmd is already stopped, an error message is displayed: # service clvmd stop Stopping clvm: [FAILED] The error message is the expected result when running service clvmd stop after clvmd has stopped. Depending on the type of cluster manager (either CMAN or GULM), run the following command or commands: · CMAN -- Run service fenced stop; service cman stop. At each node, run /sbin/chkconfig as follows: # chkconfig --level 2345 rgmanager off 105 Appendix E. [. . . ]