Forum Discussion

Nimbostratus

Nov 06, 2015

Upgrade from v11.6.0 HF4 to v11.6.0 HF6 breaks some monitors

Hi all, Is there any problem known with v11.6.0 HF6 upgrade with http monitors? The customer was using the following http monitors in v11.6.0 HF4: `GET /_layouts/15/success.aspx HTTP/1.1\r\nHost...

Chris_103447
Nov 16, 2015
I got bit by this last night, which resulted in extended downtime until we found the cause. On our LTM-VE (standalone), it only doubled the backslashes, which allowed it to work on some pools still. Our 2000s HA pair got triple backslashes, though, and marked everything down as a result. Not good.

https://support.f5.com/kb/en-us/products/big-ip_ltm/releasenotes/product/relnote-ltm-11-5-1.htmlrn_ki

ID 453256 seems to point to an issues with double quotes are backslashes in monitors. Seems pretty hard to avoid getting hit by it (I'd probably over/under escape).

https://support.f5.com/kb/en-us/products/big-ip_ltm/releasenotes/product/relnote-ltm-11-6-0.htmlrn_ki

Different ID, 291584, points to another backslash issue where the workaround is to delete the extras.

Brad_Parker_139

Nacreous

What we have done to work around this to limit downtime is the following below. This should result in no pool being marked erroneously down on the Active device. I have also notified support.

Disable auto sync(if its enabled.)
upgrade Standby and reboot.
after the standby reboots, overwrite config on Standby from Active with a manual sync
force Active to Standby once all monitors are verified to be green(if that's expected)
repeat 2-4
re-enabled autosync