Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

RiadSanchz's avatar
RiadSanchz
Icon for Cirrus rankCirrus
Feb 19, 2018

Disabling a Pool Member for maintenance from the Server Side

Hello F5 DevCentral -   My Application and Database Teams have been requesting assistance with two issues.   Can they disable a server for maintenance and mark down the F5 health monitor w...
application delivery
big-ip
LTM
Samir_Jha_52506's avatar
Samir_Jha_52506
Icon for Noctilucent rankNoctilucent
Feb 20, 2018

Monitor disable mean your pool member will not take new request from VIP and slowly all existing session will be terminated/closed but system is remain in network. So, you will able to ping from your system/BigIP.

 

In-order to block ping, You will have to enable setting in window/unix server.

 

Samir_Jha_52506's avatar
Samir_Jha_52506
Icon for Noctilucent rankNoctilucent
Feb 20, 2018

Thank you so much for question..

When the server team changes the file to "Status: enabled" the monitor should display the node is online again I believe, correct?

defaults-from http
destination *:webcache
interval 5
recv "Status: enabled"    --> Server Team is changing the page contains based on that LB monitor. LB takes decision to enable & disable pool member
send "GET / HTTP/1.1\\r\\nHost:controlfile-test.corp.mdsdata.com"
time-until-up 0
timeout 16

recv "Status: enabled" --> Server Team is changing the page contains(enable/disable) based on that LB monitor. LB takes decision to enable & disable pool member

Client is states he see the server still receiving requests and I think he is incorrect.

Due to LB persistence method, current session is going to Pool member, Its default behavior of LB. You can make persistence 

none
in LB VIP to solve issue and make sure other persistence profile should not attached.

Im trying to understand the logic from the server side of things. Where does the client place the server.txt file which contains the "Status: enabled/disabled" text?

Client placed file on server side & changing parameters via DB/Web to enable/disable pool member.

i.e http://controlfile-test.corp.mdsdata.com/server.txt