Forum Discussion

Nimbostratus

Oct 07, 2015

Solved

Standby F5 runs external health monitor

I have an external health monitor that I have written to verify a webserver is displaying the correct information and down the node if not. When looking over the http logs of the webserver I noticed...

Hannes_Rapp_162
Oct 07, 2015
Hello, this behavior is as expected.

One reason this is beneficial comes down to troubleshooting - if more than one F5 appliances report that the pool member went "DOWN", it's a better evidence to rule out any possible F5 appliance issues. If you want, you can disable the health-check on standby F5s by writing a conditional check in the external script which verifies the appliance active-standby status prior to sending the health-check request.

If the volume of health-check requests is a problem, perhaps it will help you if you increase the health-check interval a little bit? As far as I'm aware, no easy solutions exist to stop health-checks on the standby appliances. Could be wrong in regards to v11.6 or 12.0 releases.

Hannes_Rapp

Nimbostratus

Oct 07, 2015

Hello, this behavior is as expected.

One reason this is beneficial comes down to troubleshooting - if more than one F5 appliances report that the pool member went "DOWN", it's a better evidence to rule out any possible F5 appliance issues. If you want, you can disable the health-check on standby F5s by writing a conditional check in the external script which verifies the appliance active-standby status prior to sending the health-check request.

If the volume of health-check requests is a problem, perhaps it will help you if you increase the health-check interval a little bit? As far as I'm aware, no easy solutions exist to stop health-checks on the standby appliances. Could be wrong in regards to v11.6 or 12.0 releases.