Using SNMP to take a pool member down.

Custome Monitors

 

 

Have you looked at the following:

 

http://devcentral.f5.com/Wiki/default.aspx/AdvDesignConfig/SNMPDynamicRatioMonitor.html

 

 

Perhaps there is a way to modify the script to your liking

 

 

/CB

 

 

 

 

CB, I appreciate the help, but I don't think that's what I'm trying to do here. I think that script is more for the F5 to monitor pool members and have up down status based on making a snmp poll. I'm looking to do a snmp push to the F5 device to force pool members to go down.

I don't believe you can influence the running configuration that way.

 

 

Your best bet would be to use a simple iControl script to send the request via the LTM API. You can search the iControl forum & probably find a code snip you can use: Click here

 

 

HTH

 

/deb

SNMP does provide for the ability to set values and it looks as if there is certainly ability on the F5 to do this for pool members.

 

 

I am looking to do the same as we use SNMP for other things and don't need a specific F5-icontrol solution if we can use what we already know and use.

 

 

The pool member can be set from Enabled to Disabled with the ltmPoolMemberNewSessionEnable, which is a readwrite access parameter.

 

 

if true it is enabled (All traffic allowed).

 

if false it is disabled (Only persistent or active connections allowed)

 

 

However, there seems to be a better parameter to work with that also allows values to be set:

 

 

ltmPoolMemberMonitorState

 

 

The name "monitor" doesn't seem to describe what I have observed it allowing me to set for a pool member:

 

 

7 sets it to forceddown - which is Forced Offline (Only active connections allowed).

 

 

other values are:

 

0 - unchecked (no monitoring is set for this member)

 

1 - checking

 

2 up

 

6 down

 

9 disabled

 

 

note that some of these appear to conflict with whatever service checking has been configured for the node. If you mark it as up (2), for example, it ddoesn't appear to bring monitoring up if there isn't any service checking.

 

 

so for the most part, I think i'd use this one only to set a forced offline and return it back again. Returning it would be to put it back to the same value it was before you set it to offline (7).