Hi,
does nginx have a variable, that represents the destination IP address
and
port, like it was seen/used by the client at the connection time?
Thank you.
WBR,
Alexey
Hi.
Am 30-03-2016 10:24, schrieb Alexey S:
Hi,
does nginx have a variable, that represents the destination IP address
and port, like it was seen/used by the client at the connection time?
Could you mean
http://nginx.org/en/docs/http/ngx_http_upstream_module.html#var_upstream_addr
Cheers Aleks
Hi Aleks,
I think it’s not the one.
AFAIU the closest match for HAProxy “dst” is $server_addr, but it
doesn’t
work as good with DNAT, because it hides original destination IP used by
a
client, even though there is a way to retrieve this information [1].
My usecase is following:
a) I create iptables rules on the host:
iptables -t nat -A OUTPUT -p tcp -d 192.168.170.1 --dport 7654 -j
DNAT --to-destination 127.0.0.1:11123
iptables -t nat -A OUTPUT -p tcp -d 192.168.170.2 --dport 7654 -j
DNAT --to-destination 127.0.0.1:11123
b) Run load balancer on localhost port 11123
c) Use telnet to hit 192.168.170.1:7654 and 192.168.170.2:7654
d) I need load balancer to choose different upstreams depending on the
address I specified on step (c)
It works with HAProxy, but unfortunately I can’t find how to make it
work
with NGINX 
WBR,
Alexey.
[1] haproxy/src/proto_tcp.c at master · haproxy/haproxy · GitHub