On 28/05/2015 10:14 πμ, Kevin Maziere wrote: > > > 2015-05-26 17:02 GMT+02:00 Lukas Tribus <[email protected] > <mailto:[email protected]>>: > > > Hi the list > > > > In my backend I've many servers, and I'd like to add some that receive > > a copy of all the requests arriving to the backend. Of course haproxy > > won't reply to them after sending the request. > > I don't find any option for 'server' in section 5 of the docs, that > > will allow me to define such 'spy' servers. > > Is that possible ? > > No, you can only send a request once, to a single server. > > > > Lukas > > > After searching it seems that this functionality is often wanted by > users, and only third part proxy (teeproxy/gor/...) are doing part of > the job. > Could it be added to feature request ? Maybe a new keyword for server > like 'mirror' for example, which also send the traffic to the host but > discard any answers. > > Kévin >
Depending the purpose of the 'mirror' you can achieve it without touching HAProxy. If you want to reply traffic for debug/performance reasons and request don't carry payload(POST method etc) you can enable logging, either on HAProxy or target servers, and take from the log the info you need and replay them with a tool(curl/wget/siege etc). Another way is to use a TAP device, some of them have can 'duplicate' incoming traffic to another destination. Cheers, Pavlos
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