
Chapter 6. High Availability (HA)
6.1. Overview
This chapter describes how to setup ThinLinc with High Availability (from now on referred to as "HA")
for the VSM server, providing protection against the single point of failure that the hardware running the
VSM server normally is.
The basic principle behind this setup is to have two equal machines, both capable of running VSM
server. If one of the machines goes down for some reason, the other machine will take over and serve
VSM server requests with no or short interruption of service.
Note: The HA functionality provided by ThinLinc provides synchronization of the ThinLinc session
database across two VSM servers. The software used by these machines to implement failover is not
part of ThinLinc, and must be installed and configured according to your requirements. The industry
standard for doing so on Linux is provided by the Linux-HA project; see http://linux-ha.org for more
information.
6.1.1. Background - Reasons For a HA Setup
In a standard ThinLinc setup, there is a single point of failure - the machine running the VSM server. If
the VSM server is down, no new ThinLinc connections can be made, and reconnections to existing
sessions can’t be established. Existing connections to VSM agent machines still running will however
continue to work. A ThinLinc cluster of medium size with one machine running as VSM server and three
VSM agent machines is illustrated in Figure 6-1
Figure 6-1. A non-HA ThinLinc cluster setup
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