Red Hat Gfs - Red Hat CLUSTER SUITE - FOR RHEL 4 Overview

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Figure 1-11 shows an example of a high-availability cluster service that is a web server
named "content-webserver". It is running in cluster node B and is in a failover domain that
consists of nodes A, B, and D. In addition, the failover domain is configured with a failover
priority to fail over to node D before node A and to restrict failover to nodes only in that
failover domain. The cluster service comprises these cluster resources:
IP address resource — IP address 10.10.10.201
•
An application resource named "httpd-content" — a web server application init script
•
/etc/init.d/httpd
A file system resource — Red Hat GFS named "gfs-content-webserver"
•
Figure 1-11. Web Server Cluster Service Example
Clients access the cluster service through the IP address 10.10.10.201, enabling interaction
with the web server application, httpd-content. The httpd-content application uses the gfs-
content-webserver file system. If node B were to fail, the content-webserver cluster service
would fail over to node D. If node D were not available or also failed, the service would fail
over to node A. Failover would occur with no apparent interruption to the cluster clients.
The cluster service would be accessible from another cluster node via the same IP address
as it was before failover.
Chapter 1. Red Hat Cluster Suite Overview
(specifying )
httpd