Hi @brahima,
This is totally possible, however, Nomad does not currently provide a native DNS lookup feature with its service discovery functionality. The way to achieve this would be to utilise Nomad’s template block from within the HAProxy job and use the consul-template Nomad API lookup functions to lookup services that you wish to route to from the HAProxy instance. This would then write a config file that HAProxy loads; changes to the config could then use the template signal configuration options to send a SIGHUP signal to HAProxy to inform it to reload its configuration.
Thanks,
jrasell and the Nomad team