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go-chasquid-smtp/docs/haproxy.md
Alberto Bertogli e79586a014 Implement HAProxy protocol support 
This patch implements support for incoming connections wrapped in the
HAProxy protocol v1.

This is useful when running chasquid behind a HAProxy server, as it
needs the original source IP to perform SPF checks.

This patch is a reimplementation of one originally provided by Denys
Vitali in pull request #15, except the logic for the protocol handling
is moved to a new package, and the smtpsrv.Conn handling of the source
IP is simplified.

It is marked as experimental for now, since we want to give it a bit
more exposure just in case the option/api needs adjustment.

Thanks a lot to Denys Vitali (@denysvitali in github) for sending the
original patch for this, and helping test it!
2020-11-13 20:49:42 +00:00

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HAProxy integration

As of version 1.6, chasquid supports being deployed behind a HAProxy instance.

This is EXPERIMENTAL for now, and can change in backwards-incompatible ways.

Configuring HAProxy

In the backend server line, set the send-proxy parameter to turn on the use of the PROXY protocol against chasquid.

You need to set this for each of the ports that are forwarded.

Configuring chasquid

Add the following line to /etc/chasquid/chasquid.conf:

haproxy_incoming: true

That turns HAProxy support on for all incoming SMTP connections.