HAPROXY per domain redirection

haproxyhttp-headersredirection

I'm trying to redirect requests to my load balancer by domain name with acl and hdr_dom, to a separate backend.
The redirection works ok with the first request – 'GET /' (the destination server is a WordPress site) but when the client asks for the assets ('GET /blablabla/style.css' for example) the haproxy doesn't redirect it to the right backend anymore, but to the default one, with .

In the haproxy log I can see the correct host that the request is for (the one that I defined in hdr_dom) but it's like that since the GET request itself is relative (I mean not containing the domain but only from the /blablabla and forth), haproxy doesn't recognize it with the hdr_dom. I'm just guessing here.. Please help…

Best Answer

I have a configuration similar to this one and it works

use_backend webcams if { hdr(host) -i webcams.XX.YY webcams.YY.ZZ }
use_backend spain   if { hdr_dom(host) -i TT.es }
default_backend DEFAULT

Note that this config parses the "Host" header in two different ways: exact host name and domain only, always ignring the case.

Idea: are you parsing the correct part of the header? Only the domain, for example, instead of the whole hostname, or there is a case mismatch...

Related Solutions

Haproxy Beginner Problem!

Put the

reqrep ^([^\ ]*)\ /comet/(.*) \1\ /\2

into your backend definition. That way, Haproxy can use that path for its routing decision in the frontend. Here, a request with /comet at the beginning will match the req_cometd_path acl and will thus be routed to the correct backend.

In the backend itself, you can now adjust the request to be suitable for the actual application server behind it. Thus the stated rule above is going to remove the /comet from the beginning of the path for all requests going through the comet backend.

Edited (added the following):

Regarding your second issue, hdr_dom only matches if the stated string (in your case comet.okiez.com) is found isolated or delimited by dots in the header. You probably want to use one of

# matches if 'comet' is somewhere in the host
acl req_cometd_host hdr_dom(host) -i comet
# matches if 'comet' is at the beginning the host
acl req_cometd_host hdr_beg(host) -i comet
# matches if the host is comet.okiez.com
acl req_cometd_host hdr(host) -i comet.okiez.com

For more details, have a look at the Haproxy configuration manual.

Using HAProxy for transparent forwarding and selective redirection

There is no way to configure haproxy to do this for you. The backend servers in haproxy have to be explicitly named.

Couldn't you instead just use a dedicated DNS server to direct the phone to the correct server?

Best Answer

Related Solutions

Haproxy Beginner Problem!

Using HAProxy for transparent forwarding and selective redirection

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