Re: [exim] HAProxy SMTP Proxy Protocol

Startseite
Nachricht löschen
Nachricht beantworten
Autor: Matt Bryant
Datum:  
To: exim-users
Betreff: Re: [exim] HAProxy SMTP Proxy Protocol
been going through the TCP dump i got from one of the failures ...


haproxy (syn) ---------------> exim
exim (syn,ack) ---------------> haproxy
haproxy (ack) ----------------> exim
exim (banner) 3s later ---------> haproxy
haproxy (proxy line) ---------> exim
exim -----------------------> haproxy

so not sure if its exim or haproxy at this point .. will need to compare
with a working conversation .. but from my understanding the proxy line
should be pre-banner ... but whether is haproxy not sending it in
sequence or exim jumping the gun ... from hosts NOT on the proxy_host
list things still work ok.

still even so should this be a solid 5xx reject or a 4xx defer when this
issue happens .. for a client 5xx is nice but for mx server 4xx would be
nicer ie defer as temporary issue and defer rather than bounce.

rgds

Matt B.

On 27/02/2015 7:18 pm, Phil Pennock wrote:
> On 2015-02-27 at 15:37 +1000, Matt Bryant wrote:
>> Is anyone using this in anger yet ??? Been doing some testing and most
>> of the time it works ok but there are occasions when 'Proxy Negotiation'
>> fails, give the ha proxy VM a quick reboot and starts working again .
>> which is kinda strange.
> I believe that Todd Lyons, the Exim maintainer who wrote the support, is
> using it.
>
> Note that if things work when you reboot the bit which isn't Exim, then
> that suggests that some state has shifted on that box and that if you
> didn't touch Exim when you rebooted the other one, then Exim is not in a
> bad state and is continuing to work in the same way it was before.
>
> At this point, log-files from Exim and from the HA box at the point in
> time when the failures latch on would be good to see.
>
> -Phil