[scurvy]

But why the need for abstraction and isolation? If I'm a reasonably well run web shop that knows how to run their apps and balance out server load, what does Docker get me?

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.

[scurvy]

@mateuszf can you give actual examples of each? I can upgrade nginx on my servers without affecting memcache or MySQL or redis or....Why the need for isolation there?

[oldmanjay]

Docker is a tool to empower developers to better manage the applications that we currently leave to people who, and I'm trying to be charitable here, seem to think knowing how to type and be rigid in their opinions is some kind of qualification for managing systems.

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.

[mateuszf]

Isolation - so you can run / snapshot / restore multiple applications not influencing each other on one machine. Abstractions so that you code doesn't have to worry about different os-es, cloud providers, etc.