Today is carnival, and what am I doing?
I'm participatin in a software release change at one of our customers systems.
Action starts at 23:00 and I guess if nothing goes wrong, we'll be finished shortly after midnight.
My personal fraction of work will be to shut down the systems, change a small part, wait for my collegues to finish database- and web-updates and then start the whole stuff up again. Mostly waiting.
I don't expect something to go havoc because our release-process ensures an almost straightforward workflow and our software should be failure-tolerant enough to start up without much trouble. And takeover systems are always present so that the customers shouldn't recognize, that something is changing.
Nevertheless, stopping a system which is in use by several thousands of people 24/7 is a bit thrilling every time.