By Mitja Resman

The excessive functionality and balance of CentOS Linux are the foremost components that make CentOS Linux the correct Linux distribution to construct excessive availability options on. This e-book introduces you to excessive availability ahead of in brief strolling you thru the cluster stack and its layers. The booklet is then divided into elements, half A and half B, according to CentOS models 6 and seven respectively. each one half starts with the deploy and configuration of the Corosync cluster messaging software program with CMAN or with the Pacemaker cluster source administration software.

You can also be brought to cluster carrier configuration and cluster carrier administration prior to you configure fencing or STONITH on CentOS 6 and CentOS 7. by way of the top of this publication, you have the talents required to independently layout, enforce, and retain a CentOS excessive availability multinode cluster environment.

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In your cluster environment, SSH keys should be replicated, allowing passwordless (and quicker and more efficient) file transfer. Summary In this chapter, you became familiar with cluster stacks and cluster stack layers. Each cluster stack layer was explained in detail by elaborating on the tasks it must provide and how to provide them. You also learned about the cluster software stack solutions that will be presented in practical examples in the following chapters of this book, and the necessary preparations and recommendations before installing the cluster software stack.

Conf" shutdown_wait="60"/> Do not forget to increase the config_version parameter number. [ 45 ] Resource Manager on CentOS 6 Make sure that you the validate cluster configuration file with every change. In the following screenshot, you can see the command used to validate the CMAN configuration: After we've validated our configuration, we can distribute the cluster configuration file to other nodes. In this screenshot, you can see the command used to distribute the CMAN configuration file from the node-1 cluster node to other cluster nodes: Services The cluster services are defined within the RGManager tag of the CMAN configuration file after the cluster resources tag.

The order of the listed cluster nodes is important because it is also the priority order. • Unordered: (parameter: ordered="0"): This failover domain configuration allows any of the configured cluster nodes to run a specific cluster service. • Failback: (parameter: nofailback="0"): This failover domain configuration allows you to configure failback for the cluster service. This means the cluster service will fail back to the originating cluster node once the cluster node is operational. • Nofailback: (parameter: nofailback="1"): This failover domain configuration allows you to disable the failback of the cluster service back to the originating cluster node once it is operational.

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