Sequence to Update ISPConfig in a multi server setup

Hi,
I searched the forum and read the howto update ispconfig-3 - no clue.
In past, updating multi server enviroment leads to SQL-errors.
So what is the right sequence to update ISPConfig 3 in such an enviroment?
Maybe it's a good idea to also add a hint to the howto?

Best regards,
cmks

 

enable maintenance mode -- don't think it's strictly needed, but will avoid someone trying to change settings during an update.
update the master server
update the other servers in whatever order is most convenient for you.
disable maintenance mode.

 

You mean this howto? https://www.faqforge.com/linux/controlpanels/ispconfig3/how-to-update-ispconfig-3/
It does mention maintenance mode, however it indeed does not say to upgrade master first. The comments discuss this, though.