Hi,

hope you're doing well.

On Mon, Feb 21, 2022 at 02:20:01PM -0500, george22 wrote:
> Hi
>
> I've implemented sticky learn for my weblogic application running on 3
> servers using Nginx as the reverse proxy and trying to get an understanding
> of how nginx sticky learn works.
>
> The JSESSIONID cookies are of the form <session identifier>!<primary server
> id 1><!secondar server id 2>.
>
> I understand that nginx learns from the 'sticky create' to determine which
> upstream server the request should be routed to using lookup cookie. But it
> is not clear from the documentation what happens when the upstream primary
> server is down. Will nginx route to secondary server? Based on my initial
> tests it looks like it does not route to the secondary server. I need
> confirmation if this is expected behavior. What do I need to do to route
> requests to secondary server if primary server is down using sticky learn?
>
>
> upstream app1 {
> least_conn;
> zone app1 64k;
> server srv1.example.com:5111;
> server srv2.example.com:5111;
> server srv3.example.com:5111;
> sticky learn
> create=$upstream_cookie_JSESSIONID
> lookup=$cookie_JSESSIONID
> zone=client-sessions:1m
> timeout=2h;
> }

The sticky [1] directive, from the http_upstream module [2], is the part
of the commercial subscription [3], so I'd recommend to send your
questions and concerns to the NGINX Plus support team, [4].

Thank you.

[1] https://nginx.org/en/docs/http/ngx_http_upstream_module.html#sticky
[2] https://nginx.org/en/docs/http/ngx_http_upstream_module.html
[3] https://www.nginx.com/products/
[4] https://www.nginx.com/support

--
Sergey A. Osokin
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