Honestly, I personally like the combination of keepalived+docker(swarm if needed)+rsync for syncing config files. keepalived uses VRRP, which creates a floating

Honestly, I personally like the combination of keepalived+docker(swarm if needed)+rsync for syncing config files. keepalived uses VRRP, which creates a floating IP. It's extremely lightweight and works like a charm. You won't even notice the downtime, the switch to another server IP is instant