Understand HAProxy to load balance on a Galera Cluster
I am a newbie in software architecture and I have some question:
I don't understand which requests is sent to the HAProxy on this image.
I mean: if one "Application" Server (backend) want to save data in the Galera Cluster
what is the request that will be sent to the HAProxy?
Is it an sql query "request"?
If it is an sql query should the HAProxy server needs a mysql-server to "handle" the connection?
Should Application Server needs to be configured to make an sql connection to the HAProxy?
from: https://fromdual.com/making-haproxy-high-available-for-mysql-galera-cluster
Thanks!
The application only needs to know the IP address of the VIP in this architecture. The app connects to that VIP using a MySQL connector, as if it is a MySQL Server.
The "requests" are then stateful TCP/IP connections using the MySQL protocol, just as if the app were connected directly to a MySQL node.
This is not a series of stateless http requests. You might be assuming that HAProxy is only for load-balancing http requests. In fact, HAProxy can be used for other protocols than http.
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