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5
Configuring Cluster Resources
From Command Line
Like in Chapter 4 (page 31), a cluster resource must be created for every resource or
application you run on the 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 that you want to make available to users at all times.
You can either use the graphical HA Management Client utility, or the
crm
command
line utility to create resources. This chapter introduces the several
crm
utilities.
5.1 Command Line Tools
After the installation there are several tools used to administer a cluster. Usually you
need the
crm
command only. This command has several subcommands. Run
crm
help
to get an overview of all available commands. It has a thorough help system with
embedded examples.
The
crm
tool has management abilities (the subcommands
resources
and
node
),
and are used for configuration (
cib
,
configure
). Management subcommands take
effect immediately, but configuration needs a final
commit
.
Configuring Cluster Resources From Command Line 59