Forum Discussion

Nimbostratus

Nov 06, 2013

LTM Load Balancing with backend monitoring

Hi all, I have a design question that i would like to know if it is achievable using LTM. ______________ LB01 -- SW01 --| Webserver1 |-- Backend1 -- Database1 | | ...

availability

BIG-IP Access Policy Manager (APM)

deployment

design

security

IheartF5_45022
Nov 06, 2013
There are a few ways;

Have the healthchecks to the Webservers trigger checks from the Webserver to the relevant Backend/Database servers. This doesn't really involve the F5 (apart from the Webserver pool), but is a good solution as it checks that the WebServer can reach it's assigned backend/database servers.

Use monitors assigned to the Webserver nodes (not the pool) that have alias addresses. You'd assign one monitor for the Backend and one for the database server assigned to each Web server node. You'd also have a monitor (with no alias) assigned to the Webserver pool.

Rearchitect so that you don't have such a tightly coupled hierarchy. Use a virtual for the Web Servers to talk to the backedn servers, and for the backend servers to talk to the database servers.

Joanna

IheartF5_45022

Nacreous

There are a few ways;

Have the healthchecks to the Webservers trigger checks from the Webserver to the relevant Backend/Database servers. This doesn't really involve the F5 (apart from the Webserver pool), but is a good solution as it checks that the WebServer can reach it's assigned backend/database servers.
Use monitors assigned to the Webserver nodes (not the pool) that have alias addresses. You'd assign one monitor for the Backend and one for the database server assigned to each Web server node. You'd also have a monitor (with no alias) assigned to the Webserver pool.
Rearchitect so that you don't have such a tightly coupled hierarchy. Use a virtual for the Web Servers to talk to the backedn servers, and for the backend servers to talk to the database servers.

Joanna