Hi Luther! Docker containers and snaps are different but sometimes overlap in solving certain classes of technical problems. For instance, "software distribution" as a broad problem is addressed by both snaps and Docker containers, but with very different implementations.
First of all, yes you can run Docker on top of an all-snaps system such as Ubuntu Core, and the Docker snap will also give you a Docker engine runtime on Ubuntu classic. Docker containers and snaps are built on different goals. Snaps will typically look and feel like system or user apps running directly on your regular system: you see them in the process list, they see each other if the sandboxing allows it, they may interact with the screen/USB devices/whatever if permissions allow it etc.. Docker containers feel more like very efficient virtual machines that you connect to, they allow for sandboxing as well – where the whole container is sandboxed – and for resource quotas. On your question of snapping a docker container: yes, you would be able to wrap a Docker image inside a snap which would be a client of the Docker snap. On the top of my head, I can personally think of two main cases where you would want to run containers on top of an all snap system: when your workload is already packaged as a container, or when you want to use the resource limits featured in Docker or LXD (e.g. limit network usage, CPU usage etc.). Cheers, - Loïc Minier On Wed, Jan 25, 2017 at 12:53 AM, Luther Goh Lu Feng <elf...@yahoo.com> wrote: > I seek clarity in understanding how docker containers are different from > snaps. The question originated as I pondered if docker containers are the > equivalent of snaps. Is there a blog post or FAQ somewhere that already > addresses this? > > > I also read this article[1], though dated, mentions docker support in > Snappy, which makes me wonder: > > - the scenarios that I would want to deploy docker containers alongside > snaps > - snapping a docker container. > > Appreciate if someone can enlighten me. Thanks. > > > -- Luther > [1] http://thenewstack.io/snappy-ubuntu-a-new-cloud-os-with- > support-for-docker-in-a-post-shellshock-era/ > > -- > Snapcraft mailing list > Snapcraft@lists.snapcraft.io > Modify settings or unsubscribe at: https://lists.ubuntu.com/ > mailman/listinfo/snapcraft > -- - Loïc
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