I’ve been using Big-IP LTM appliances little over 2 years and during this period upgrade of these are a real pain in one or other way. I would like to summarize a procedure which I follow which elimiates this pain.
1. Before following any upgrade procedure, failover and failback with an interval of 10 mins each so as to make sure all applications are working under current version of Firmware on both appliances. This step may be optional if you are running Big-IP in Active/Active Mode.
2. reactivate license
3. Before you upgrade, generate a qkview file from the current version.
https://support.f5.com/kb/en-us/solutions/public/12000/800/sol12878.html
4. Now you can perform standard upgrade procedure by installing base version to a new partition(volume) + update the same with any HF applicable. I assume the upgrade procedure is performed at Standby unit.
5. Once the upgrade is completed and F5 appliance is backonline, do NOT run active traffic to it for 10-15mins.
6. This is required to allow F5 complete all required monitoring checks for all of pool members hosted.
7. Generate another qkview file from the same appliance(after upgrade)
8. Check by comparing the old firmware qkview and new qkview using https://ihealth.f5.com/qkview-analyzer/ for pool member status. They both should match…. else something is wrong with the new firmware… may be related to monitoring…
9. If all good, pass active traffic else, inspect monitors which flag pool members as down.
10. Use both qkview files to reachout to F5 support, easy to debug and to provide a fix.
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