On Thu, Nov 15, 2018 at 1:36 AM Aleksandar Lazic <al-hapr...@none.at> wrote:
> Hi Vijay. > > Am 14.11.2018 um 10:14 schrieb Vijay Bais: > > Hello Aleksandar, > > > > We already considered using haproxy maps but we still have to define N > backends > > for corresponding N keys in the map file. > > I'm looking more at an implementation with single backend definition > with the > > server options as placeholders. > > > > Ex. Using maps would look something like this > > > > frontend nat > > bind *:10000 > > use_backend %[req.hdr(X-MyHeader), map(/etc/haproxy/my.map)] > > > > backend example1.com > > server myserver1 example1.com:80 source 10.0.0.1 > > > > backend example2.com > > server myserver2 example2.com:80 source 10.0.0.2 > > > > backend example3.com > > server myserver3 example3.com:80 source 10.0.0.3 > > > > > > > > Whereas, we are looking for something like below > > > > > > frontend nat > > bind *:10000 > > default_backend generic > > > > backend generic > > server myserver %[req.hdr(X-MyHeader)] source %[dst] > > Ah now concrete examples ;-) > > Maybe you can use the server template?! > > https://cbonte.github.io/haproxy-dconv/1.8/configuration.html#4-server-template > > So you would like to have something like this, is this possible, I don't > think so? > > backend generic > server-template myserver 1-3 %[req.hdr(X-MyHeader)]:80 check source > 0.0.0.0 > usesrc %[dst] > > Which version of HAProxy do you use? > > haproxy -vv > > > Thanks, > > Vijay > > Regards > Aleks > > > On Wed, Nov 14, 2018 at 1:39 PM Aleksandar Lazic <al-hapr...@none.at > > <mailto:al-hapr...@none.at>> wrote: > > > > Hi. > > > > Am 14.11.2018 um 08:46 schrieb Vijay Bais: > > > Hello, > > > > > > We have a requirement wherein a single generic backend with server > options > > > configured as placeholders, which will resolve on the fly or at > runtime. > > > > > > Currently, we have to define multiple backends (has to be > hardcoded) and > > select > > > them using the /use_backend/ keyword. > > > > > > Kindly help us with this generic backend implementation in HAProxy > and let us > > > know if its possible OR any alternative way that this can be > achieved. > > > > Maybe you can use maps for your requirement. > > > > https://www.haproxy.com/blog/introduction-to-haproxy-maps/ > > > > As an example can you take a look at the openshift router template > ;-) > > > > > https://github.com/openshift/origin/blob/master/images/router/haproxy/conf/haproxy-config.template#L201-L202 > > > > > Thank you in advance, > > > Vijay B > > > > Regards > > Aleks > You will need something dynamic like described here https://www.haproxy.com/blog/haproxy-and-consul-with-dns-for-service-discovery/
