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Sticky sessions allow to route the same client to the same upstream server.
- upstream structures are extended to keep session-related information
- existing balancing modules are updated to provide an id of the selected
server (SID) in pc->sid, and to select the server, given it's SID.
- other balancing modules are allowed to set the pc->hint value to choose
the desired peer. The sticky module will not change the hint if it's
already set.
- the feature is enabled by default and can be disabled with the
"--without-http_upstream_sticky" switch of the configure script.
The following configuration can be used to enable sticky sessions for
supported balancing modules:
upstream u1 {
server 127.0.0.1:8080;
server 127.0.0.1:8081;
sticky cookie server_id expires=1h domain=.example.com path=/;
}
Co-authored-by: Ruslan Ermilov <ru@nginx.com>
Co-authored-by: Roman Arutyunyan <arut@nginx.com>
Co-authored-by: Maxim Dounin <mdounin@mdounin.ru>
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