Considering moving a keepalived HA setup to 1.8.4 from 1.7.9, and are wondering if 1.8 could peer stick-table w/1.7?
In this case we would attempt to fail-over service from active haproxy 1.7 to a 1.8 for a while and if successful later update passive 1.7 also to 1.8 and on error fail back to previous active 1.7 and revert 1.8 node.
Forget about it, just patch both nodes to 1.8.4 …