Forum Discussion
pkhatri_72515
Nimbostratus
NimbostratusAutometically pull Member in/out of the Pool?
Hello Experts,
Is there a way to pull members out/in of the pool automatically at certain time?
We have 2 members(windows servers) in a pool, there is a need of restarting a service every Saturday night at 2AM, we can handle this task autometically in OS to take effect at 2AM every Sat. but how to pull pool members out and put back in one at a time?
Thanks for your help.
PK.
LTM 10.1
2 Replies
Michael_YatesAlmost anything you can do within a iRule (like LB::down) would be undone by the next successful Health Check against the node that you were wanting to remove from the pool.
You have a few options:
1. Log into the LTM prior to the restart and disable the node manually (However, any connected users would persist to the server unless you disabled the node and allowed enough time for all connected users to complete their current sessions and disconnect normally).
2. Don't disable anything. Just run your maintenance (the server stops responding during the restart, fails the health check and the LTM marks the node as Failed during your maintenance). You have the additional option of setting the "Slow Ramp Time" on the Pool (keeps the server out of the pool for a specified amount of time after the first successful health check. Good for allowing the server to totally recover after a reboot, etc...).
3. Create a custom Health Monitor that is applied to the Pool. The monitor can be configured to look for a specific response when checking a specified file. If an unexpected response is recieved it will mark the pool memeber as Failed. You can configure your automated maintenance to change the file removing the node from the pool, and then change the file again allowing it to be added back into the pool.
Option 2 is what I would recommend (I would also suggest setting the "Action On Service Down" to "Reselect" if you choose this opton as well (It will redirect the user to a different node more gracefully if they are connected to a node when it goes down).
pkhatri_72515Thanks Michael for suggesting 'slow ramp time', I was not aware about it. will try that and test it out. Thanks again for your reply.
