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Habib_Ulla_Khan's avatar
Habib_Ulla_Khan
Icon for Nimbostratus rankNimbostratus
Feb 28, 2017

Monitoring custom page on SMTP server

Hi All,

 

I have a pool which has smtp monitor set. But server team wants us to set SMTP (Service will not be made down) and but other monitoring (like availability page- this needs http- cannot bring http up on this server)to control node.

 

Eg: SMTP service will be up always. Is there any other monitor which can be set (like availabiity page) so that server team can rename the file and make node down from f5 perspective.

 

I have checked external monitor but not sure which one to use so that server team can control either or renaming or modifying set file.

 

Appreciate your help in advance.

 

application delivery
BIG-IP
LTM

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  • Ed_Summers's avatar
    Ed_Summers
    Icon for Nimbostratus rankNimbostratus
    Feb 28, 2017

    You can assign a standard http monitor to the pool. By default a pool monitor will monitor the ports listed per pool member. However in the monitor configuration you can override this and specify the port that you want.

     

    For example: If the server team wants to bind an HTTP server to port 80 on the SMTP server, you can assign a custom http monitor that inherits (defaults-from) the built-in http monitor, and change the destination to _:80. (_:80 = probe the ip of the pool member, but on port 80 instead of port defined by pool member)

     

    Works the same for HTTP or HTTPS monitors, and you can set your SEND and RECEIVE strings as normal. Set the SEND string to get the file, and RECEIVE string to an appropriate value that will be in the file. You can also set a Receive Disable string so the file can be modified to disable the pool member as well.

     

    [Edited to add] Check Cory's answer here for an example. Just leave the address portion of destination as the wildcard * to monitor all pool member IPs.

     

    Also noting: GUI lists these as "alias address" and "alias service port", while TMSH combines these into the "destination" field.