Hey, You can use options "retries" and "redispatch". As soon as HAProxy has sent a request to a server, it's not available anymore in its buffer. So you're sure it won't be sent again to an other server.
Cheers On Fri, Jun 15, 2012 at 2:06 PM, Gábor Farkas <[email protected]> wrote: > hi, > > currently i use nginx to handle a configuration, but i'm unable to do > there what i need, > so i'm looking into haproxy, if i could use it for load-balancing. > > what i'd like to achieve is: > - i have mutliple backends (let's say 2: backend-a, backend-b) > - when a request comes in, i want it to be proxied round-robin to one > of the 2 backends > - let's say it is sent to backend-a > - now, if backend-a is unavailable (the port is closed for example), > or, it's socket-backlog is full, > i want haproxy to try backend-b > - haproxy should not try backend-b in any other case. for example, if > backend-a already started > to read the request, and then crashed, backend-b should not be tried. > an error should be sent to the client. > > basically i want to be able to failover when the socket-backlog is > full, but i do not want to double-process > any http-requests. > > is this possible with haproxy? > > thanks, > gabor >
