ClearPass Guest 3.9 | Deployment Guide
High Availability Services |
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Chapter 11
High Availability Services
The goal of a highly available system is to continue to provide network services even if a hardware failure
occurs.
High Availability Services provides the tools required to achieve this goal. These tools include service
clustering, fault tolerance, database replication, configuration replication, automatic failover and automatic
recovery.
You must have two ClearPass Guest servers with the High Availability Services plugin installed in order to
use these features.
See
“About High Availability Systems”
in this chapter for an introduction to High Availability Services
including a detailed explanation of how it works.
See
“Cluster Status”
in this chapter for an explanation of the cluster status messages.
See
“Recovering From a Failure”
in this chapter for the procedures to use if you need to recover a failed
cluster.
Accessing High Availability
Use the
High Availability
command link available from the
Administrator
start page to access the
clustering and replication features.
Alternatively, use the High Availability navigation menu to jump directly to any of the high availability
features.
About High Availability Systems
Terminology & Concepts
A
cluster
consists of a primary node and a secondary node, configured so that a failure of either node will
not prevent the cluster as a whole from performing its normal functions.
The
primary node
is the active server in a cluster. The cluster’s network services are always delivered by
the primary node.
The
secondary node
is the backup server in a cluster. If the primary node fails, the secondary
automatically takes over and continues delivering network service.
Fault tolerance
is the ability of a server cluster to continue operating if either the primary or secondary
node experiences a hardware failure.
Failover
is the process by which the secondary node assumes control of the cluster once the primary node
has failed.
Summary of Contents for ClearPass Guest 3.9
Page 1: ...ClearPass Guest 3 9 Deployment Guide ...
Page 32: ...32 Management Overview ClearPass Guest 3 9 Deployment Guide ...
Page 178: ...178 RADIUS Services ClearPass Guest 3 9 Deployment Guide ...
Page 316: ...316 Guest Management ClearPass Guest 3 9 Deployment Guide ...
Page 410: ...410 Administrator Tasks ClearPass Guest 3 9 Deployment Guide ...
Page 414: ...414 Administrator Tasks ClearPass Guest 3 9 Deployment Guide ...
Page 423: ...ClearPass Guest 3 9 Deployment Guide Hotspot Manager 423 ...
Page 440: ...440 High Availability Services ClearPass Guest 3 9 Deployment Guide ...
Page 518: ...518 Index ClearPass Guest 3 9 Deployment Guide ...