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4
Configuring Cluster Resources
with the GUI
The main purpose of an HA cluster is to manage user services. Typical examples of
user services are an Apache web server or a database. From the user's point of view,
the services do something specific when ordered to do so. To the cluster, however, they
are just resources which may be started or stopped—the nature of the service is irrelevant
to the cluster.
As a cluster administrator, you need to create cluster resources for every resource or
application you run on servers in your cluster. Cluster resources can include Web sites,
e-mail servers, databases, file systems, virtual machines, and any other server-based
applications or services you want to make available to users at all times.
To create cluster resources, either use the graphical user interface (the Linux HA
Management Client) or the
crm
command line utility. For the command line approach,
refer to Chapter 5, Configuring Cluster Resources From Command Line (page 59).
This chapter introduces the Linux HA Management Client and then covers several
topics you need when configuring a cluster: creating resources, configuring constraints,
specifying failover nodes and failback nodes, configuring resource monitoring, starting
or removing resources, configuring resource groups or clone resources, and migrating
resources manually.
The graphical user interface for configuring cluster resources is included in the
pacemaker-pygui
package.
Configuring Cluster Resources with the GUI 31