[StavrosK]

Hell, I do significant amounts of server/Linux work, and still don't understand Docker (it doesn't help that I haven't been able to run it because btrfs).

I understand that it's a lightweigth container, but what's the advantage? Aren't images still 2+ GB? Do I have to version the entire FS instead of 2-3 config files? Can I freeze it? Can I push it to a server? How long will that take? Can I use the same image on develop, staging and production? How does it know which is which?

Etc etc.

[kalessin]

You don't need to have btrfs to run Docker (you need aufs which is included in Debian and Ubuntu).

Yes, in the end images are an entire filesystem and can be large if you installed a lot of packages (or very small, e.g: busybox). Yes, you can freeze it: you can commit a container as a new image. Yes, you can push it to a server (https://index.docker.io/). Yes, you can use the same image for development, staging and production; you'll launch different container from the same image that's it.

[StavrosK]

Ah, that clears things up a bit, thanks. However, Docker currently has a bug that prevents it from running on btrfs, which I'm running on.

[kalessin]

Oh, I'm not aware of this bug, are you talking about https://github.com/dotcloud/docker/issues/339 ? In any case, don't hesitate to open a new issue on github!

[StavrosK]

Yep, that's the one!