@syntax to start, I wouldn’t put nginx/apache on every single one of your graylog nodes. That’s a disaster waiting to happen IMHO. You’re better off creating an active/passive LB setup with the load balancers not colocated with Graylog. There are a number of tutorials out there about achieving an active/passive configuration with both of these web servers, so I’d recommend researching those and seeing which one makes the most sense for you to use.