Red Hat CLUSTER SUITE FOR ENTERPRISE LINUX 5.1 Manuel d'utilisateur télécharger pdf (Page 12)

Introduction to Linux Clustering

5 Cluster management software

To control the cluster and the movement of services, a cluster management application is required –

Linux has two main options available - Linux-HA and Redhat Cluster Suite.

Redhat cluster suite is only found on Redhat's distributions- Fedora, RHEL and other derivatives

such as CentOS, whereas Linux-HA is found in a wider range of distributions.

Most of the concepts and ideas between these two solutions are the same, so the knowledge gained

using one is likely to make it easy to use another.

5.1 Redhat Cluster Suite

Cluster Suite is designed for creating High-Availability clusters and the default steps to

configure a service will result in a HA-service depending on the number of nodes you put

into the failover domain.

5.1.1 MANAGEMENT AND CONFIGURATION

Configuration of the cluster is controlled by the /etc/cluster/cluster.xml file, which is an

XML format file. Once changed, you can run a command to redistribute the file to all the

other nodes in the cluster.

However, most people do configuration using either system-config-cluster (GTK GUI

application) or luci which is a web-based utility for cluster configuration.

The configuration of the cluster is broken in the same components regardless of the

configuration method chosen:

● Resources

Resources are anything that makes up a service. For example, a resource may be:

1. An IP address.

2. A mount point.

3. A system service (eg: httpd)

● Service

A service is a group of resources that have been given a name. The service

configuration allows you to set what order the resources are started/stopped and gives

you a name that you can use to control the service.

● Failover domains

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Red Hat CLUSTER SUITE FOR ENTERPRISE LINUX 5.1 Manuel d'utilisateur Page 12