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Cirrus
CirrusHealth monitor question
We have a user who is seeing this message very frequently in their logs from the F5 statis self IP. 10.192.10.XXX - - [04/Dec/2023:15:56:36 -0600] "GET / " 404 682 All our nodes are reporting as up...
A base HTTP(s) monitor will send a " GET / " to the service port of the pool memember, but does NOT have any recieve string. ANY response from a server 200/301/404 etc.... is a response to the monitor, and hence the node is marked up.
in creating a new monitor based off the https monitor, you can keep the default settings and change the recv string to HTTP/1\.(0|1) (2|3) <---- that will allow only 200 and 300 errors and 400/500 errors will be marked as node down. This is a great step in the right direction of providing better quality of service. It will also in the long run will have you learning all the 400/500 error codes and what they mean as you debug why the pool member is down.
Yes, in the https_8443 health monitor check if the receive string is set. If the response of the pool member, doesn't match the receive string, then the pool member will me marked as down.
See: Using regular expressions in a health monitor receive string (f5.com)