I still haven't been sold on Docker. Why would an otherwise competent company that runs things just fine, ditch it all and adopt Docker? Just because it's the shiny new thing? What do we actually gain here in production?
But then, if you don't feel like you need it, that's probably because you don't need it.
(If people are downvoting your question, it's probably because you're giving off a bit of a "I don't understand Docker so it must be crap" vibe, which is not helpful.)
Sorry if my initial question came across with a weird vibe. I'm generally curious. I have colleagues working at places and they actually are being asked to drop everything and implement Docker. I asked why and what's driving this and got the predictable response of "management/dev/someone wants something new".
Docker isn't magical, but the process that it lends itself to can be very useful. Those companies aren't using docker to be successful. They are successful because of the processes (and intensity) that docker fits into.
I'm sorry that your colleagues are being asked to drop everything and look at anything (much less Docker). That's not a nice way to work -- and I'm sure it influences their notions of Docker.
Catching it before pushing your changes is far more preferable.
There are a lot of different methods and processes to fix this. Docker is a new one that simplifies a number of the pieces of the puzzle by constraining the environment is useful ways.
However, if you already have a process worked out and aren't experiencing pain then you probably don't need to switch for the sake of switching.
That's true until something break in production: then you want to replicate the same situation in the dev environment, as close as possible.
Also, shout out to the fanboys for downvoting my question, which was just a question asking for thoughts and answers and didn't make any statement whatsoever.
It has literally nothing to do with the ability to upgrade independent pieces on the sysadmin's schedule and everything to do with abstracting sysadmins clean out of the process. The entire profession has established itself as a roadblock to progress, so like good engineers do, we're busy coding the problem away.
Basically.