Coyote Point Systems Equalizer GX Series, Administration Manual

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Layer 7 HTTP and HTTPS Cluster Persistence
Equalizer can use cookies or a server’s IP address to maintain a persistent session between a
client and a particular server. A cookie is included with the server’s response header on its way
back to the client. This cookie uniquely identifies the server to which the client was just
connected. Equalizer routes the first request from a client using load balancing criteria;
subsequent client requests are routed to the same selected server for the entire session (while
the cookie is valid -- see
Cookie Age , above). In that way, a server’s IP address can alternately be
embedded into a response header that identifies the server.
EQ/OS 10 features “fallback persistence” where Equalizer provides a secondary persistence option
where if, for example, a cookie response is not received, a secondary, or “fallback” option can be
used. With these configurable options, if two persist methods are listed, (e.g.,
Cookie 1:Cluster IP,
Server IP /Port and Source IP ) In this example the order indicates the fallback order: if a cookie is
found- the cookie will be used, otherwise the
Source IP
will be embedded in the response header
back to the client.
Persistence options on an HTTP or HTTPS cluster are configured by selecting a cluster from the
left navigational pane on the GUI and selecting the
Persistence tab to display the screen shown
below.
There are three configuration panes on this screen.
Persistence Methods, Cookie Parameters and Source
IP Parameters.
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Equalizer Administration Guide