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Racquel_Mays's avatar
Racquel_Mays
Icon for Employee rankEmployee
Feb 17, 2021

Create "Health Monitor" rule for Existing Local Traffic Policy

I have a working, existing policy, which allows specific service ports to 1 VS. However, I also need to allow an external HTTP a Health Check [rule], which would respond with a string and a "200 OK" ...
  • crodriguez's avatar
    crodriguez
    Feb 22, 2021

    I checked BIG-IP v16.0 and iRules are still the way to go if you want to send a custom HTTP response. There is no functionality to be able to do this from a local traffic policy.

crodriguez's avatar
crodriguez
Ret. Employee
Feb 18, 2021

Thank you for the additional information, Racquel. It does help. Unfortunately, as far as I can tell, there is no way to send a custom HTTP response from a local traffic policy. The functionality does not exist in v15.1 and earlier. I haven't checked in v16.0 yet, but will, just in case. So it would seem an iRule is your only option for sending the custom response string the external monitor application needs from the BIG-IP system, rather than from the application server itself.

Your iRule might look like this:

when HTTP_REQUEST {
    if { [TCP::local_port] == 8686 } {
        HTTP::respond 200 content "<response-string>"
    }
}

I don't think it's necessary to check the HTTP method if no other requests occur to port 8686.

I'll let you know if I find a local traffic policy solution in v16.0.