Load balancer in front of Schema Registry instances
It is common to have multiple instances of the same application, for example Schema
Registry, and have a load balancer in front of them. This can be useful for failover reasons
in HA environments, and it can also help sharing the load between instances.
A load balancer can be any application (HAProxy, NGINX, and so on) that listens on a specific
port and forwards requests (create schema, get schema, and so on) to Schema Registry
A load balancer not only balances requests using round robin method, but also tracks
application instances whether they are usable or not. Having a load balancer minimizes the
need to change client-side properties with instance hostnames, because the only host that
the client needs to know is the load balancer host. In case the environment is completely
insecure, you do not need to perform any additional steps. But in case of SSL or Kerberos
is enabled, some defending mechanisms (for example, hostname verification) can cause
issues, which requires additional setup to make the load balancing work.