We have a load balancer facing the Internet.
It's balancing load towards two systems behind it in the back-end running apache.
How many SSL certificates do I need to buy? - One for the load-balancer only - One for the load-balancer and for each server instance one (3 certs)+ - Only for the server instances (2 certs) - The certificates can be re-used
Also, can I re-use the server certificate as a client certificate to make calls to other backends from the apache servers?