On Wed, 20 Feb 2019 3:39 am Joao Morais <l...@joaomorais.com.br wrote:
> Hi Willy,
>
> > Em 19 de fev de 2019, à(s) 01:55, Willy Tarreau <w...@1wt.eu> escreveu:
> >
> > use_backend foo if { var(req.host) ssl:www.example.com }
> >
> This is a nice trick that I’m planning to use with dynamic use_backend. I
> need to concat host (sometimes ssl_fc_sni) and path. The question is: how
> do I concatenate two strings?
Something like this:
> http-request set-header X-Concat %[req.fhdr(Authorization),word(3,.)]_%[src]
Apparently there isn’t a concat converter and http-request set-var()
> doesn’t support custom-log like expressions. There is a usecase where I
> need to concatenate ssl_fc_sni and path before search in the map.
>
>
> > At this point I think that such heavy configs reach their limits and
> > that the only right solution is the dynamic use_backend (possibly with
> > a map).
> >
> Thanks for the detailed review! I’m going to the map route.
>
>
> >> There are also a lot of other backends and
> >> servers with health check enabled every 2s consuming some cpu and
> network.
> >
> > For this if you have many times the same server you can use the "track"
> > directive, and only enable checks on a subset of servers and have all
> > other track them. Typically you'd have a dummy backend dedicated to
> > checks, and checks disabled in all other backends, replaced with track.
> >
> I’d say that currently about 98% are unique servers, but this is indeed a
> nice implementation to the configuration builder.
>
>
> >> Note also that I needed to add -no-pie otherwise gprof output was empty
> --
> >> sounds a gcc issue. Let me know if this is good enough.
> >
> > Yes that's fine and the output was perfectly exploitable.
> >
> Great!
>
> One final note - sorry about the flood yesterday. I can say with about 90%
> sure I sent only one message =)
>
> ~jm
>
>
>
