HTTP Return Code Checking on ACE

Question

Hey there.
I have a question regarding return code checking for a serverfarm on ACE. I am looking to have the ability to monitor a client's session real-time and monitor return codes passing back from the origin servers to the client.
For example, if during a client's session there is a single HTTP 500 error code sent from server to client, the intercept that response and first retry the request on a different server in the farm. Or perhaps only if I see three 500 error codes in 30 seconds. Something like that.
From what I can tell from the docs the retcode check command for a serverfarm is maybe only for statistical purposes?
Thanks for any help.
/ahuffer/

Answer 1

In ACE return codes checking is only used to count number of return codes from Rservers. Unlike CSMs (where return codes were used for inband health monitoring) ACE is not using them for load balancing or inband health
monitoring. Once you enable return code checking and counting you can then display the return code statistics per serverfarm
for example
serverfarm host serverfarm1
retcode 200 499 check count
rserver real1
inservice
rserver real2
inservice
show serverfarm serverfarm1 retcode
serverfarm : serverfarm1
rserver : real1
np : 1
return code action total count
+------------+--------+------------+
200 count 100
201 count 0
202 count 0
203 count 0
204 count 0
205 count 0
206 count 0
498 count 0
499 count 0
Syed