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newerdog's avatar
newerdog
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Dec 18, 2022

Receive Disable String feature not work properly with IN-TMM monitoring

Hi everibody,

 

If the HTTP | HTTPS monitor uses with Disable string feature ( https://support.f5.com/csp/article/K12818  ) together with an IN-TMM monitoring feature ( https://support.f5.com/csp/article/K11323537 ) and match the pattern in answer, then the member is marked Offline instead of Disabled.

Reproducing:

1.  Send simle GET string to generic server

 

curl -v http://serverip:80 | grep 503

 

2. Get server answer

 

HTTP/1.0 503 Service Unavailable
....

 

3. Create ltm http Monitor without recv-disable string

 

create ltm monitor http MON-http send "GET / HTTP/1.0\r\n\r\n" recv "http" recv-disable ""

 

2. Create Pool

3. Attach Monitor to Pool

4.  Pool status apeared as Avaliability:Available State:Enabled

 

show ltm monitor http MON-http

 

5. Add recv-disable string to Monitor

 

modify ltm monitor http MON-http send "GET / HTTP/1.0\r\n\r\n" recv "http" recv-disable "503"

 

6. Pool status apeared as Avaliability:Avaliable State:Disabled-by-Parrent

7. Enable in-tmm monitoring feature

 

modify sys db bigd.tmm value enable

 

8. Pool status apeared as Avaliability:Offline State:Enabled

9. Change recv-disable string to unmatched from server answer (1234)

 

modify ltm monitor http MON-http send "GET / HTTP/1.0\r\n\r\n" recv "http" recv-disable "1234"

 

10. Pool status apeared as Avaliability:Available State:Enabled

============================================================

This means that the function Disable String finds the matched pattern in the server response but erroneously changes the Availability instead of the State monitor paramentr. I tried restarting the bigd process, but that didn't help.

Versions where I tried 15.1.8 and 14.1.4.4

Is this a new feature behavior or a bug?

application delivery