Nginx counterpart of haproxy's acl dst

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 ©

It works with HAProxy, but unfortunately I can’t find how to make it
work
with NGINX :frowning:

WBR,
Alexey.

[1] https://github.com/haproxy/haproxy/blob/master/src/proto_tcp.c#L600

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