Re: Will WebNS 7.5 auto fallback if new code failed to boot?
Good to see your going to 8.20 software.
I can't say for sure whether or not your CSS will fall back to the original image, although my suspicion is that it will not. I will assume that your CSS is in a redundant configuration consisting of a pair of CSS. Please correct me if I'm wrong. You can alway upgrade the standby CSS, and make sure if boots up OK on the new code. Then you can fail over to it, while you upgrade the second CSS. This way, you would always be upgrading the standby CSS, so traffic should not be impacted, even in the event of a boot failure. Then you can recover the standby that didn't boot properly while the master CSS is safely handling production traffic.
Also, I would recommend using the upgrade script rather than the manual upgrade process, especially if you have any custom user accounts and/or custom scripted probes. Another good idea as a backup plan is to temporarily (or permanently) arrange for console access to the two CSS during the upgrade process, just in case it is needed, as you are doing the upgrade remotely.
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