Active/Active NginX configuration

[kingstonsew]

I current have configured 2 NginX running on Red Had Enterprise Linux 7.3.
Both NginX will load balance a set of 4 application servers. The current
configuration for both of the NginX is active / passive by using keepalived
with a single virtual IP.

I would like to know how to make the 2 NginX into an active/active
configuration without using round-robin DNS approach.

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,274523,274523#msg-274523