Docker without Docker
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Docker without Docker
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Re: Docker without Docker
#2tl;dr It's basically a tech demo for systemd, and the systemd-nspawn tool in particular (which you might recall recently gained Docker format support).
Re: Docker without Docker
#3Author here - I'm working on a blog post for this and didn't expect this to be posted on HN so soon, but I guess that's what I should expect for posting a link to it in another HN comment! :)
These slides correspond to a workshop I conducted a week ago demonstrating the internals of Docker and how Docker containers can be run without using any of the Docker tools or runtime.
Docker is a great tool, and I'm glad it's gained so much traction. But containerization is still new to many people, and even then there's still a lot of confusion about the difference between Docker and containerization in general. The goal of this presentation isn't to discourage anyone from using Docker, but to outline the lay of the land for people interested in using containers.
Personally, I run containers both with systemd and with Docker. The good news is that it's really easy to switch from one to the other, so there's very little cost to trying it out both ways.
Re: Docker without Docker
#4What's old is new. You're describing containers I think.
Re: Docker without Docker
#5The slides mention that Docker containers have hashes. This is not the case. In fact, it's probably one of the biggest user misunderstandings of Docker. Container IDs and Image IDs are not SHA hashes. Even though it may look like it they are actually just randomly generated 256-bit hex-encoded unique identifiers.
Since the slides also mention that you can use Docker images with a systemd-nspawn/machinectl setup it would be great if they soon supported the v2 Docker Registry and image format which actually does use content-addressable hashes for images.
Re: Docker without Docker
#6As a heavy docker user who only has a couple of years of focused linux experience I found this fascinating, even if you weren't quite ready to post it. Thanks for the slides.
Re: Docker without Docker
#7Author here - I'm working on a blog post for this and didn't expect this to be posted on HN so soon, but I guess that's what I should expect for posting a link to it in another HN comment! :) These slides correspond to a workshop I conducted a week ago demonstrating the internals of Docker and how Docker containers can be run without using any of the Docker tools or runtime. Docker is a great tool, and I'm glad it's…
are there any videos from the workshop these slides are from?
Re: Docker without Docker
#8The slides mention that Docker containers have hashes. This is not the case. In fact, it's probably one of the biggest user misunderstandings of Docker. Container IDs and Image IDs are not SHA hashes. Even though it may look like it they are actually just randomly generated 256-bit hex-encoded unique identifiers. Since the slides also mention that you can use Docker images with a systemd-nspawn/machinectl setup it wo…
> Container IDs and Image IDs are not SHA hashes.
Thanks for catching that - I've updated it.
> Since the slides also mention that you can use Docker images with a systemd-nspawn/machinectl setup it would be great if they soon supported the v2 Docker Registry and image format which actually does use content-addressable hashes for images.
I haven't used the v2 registry, so I don't know if systemd (machinectl) supports this yet, but I imagine they will soon if they don't already.
Re: Docker without Docker
#9Author here - I'm working on a blog post for this and didn't expect this to be posted on HN so soon, but I guess that's what I should expect for posting a link to it in another HN comment! :) These slides correspond to a workshop I conducted a week ago demonstrating the internals of Docker and how Docker containers can be run without using any of the Docker tools or runtime. Docker is a great tool, and I'm glad it's…
are there any videos from the workshop these slides are from?
Unfortunately not, though there's been a lot of interest in this talk, so I'll likely be presenting it again. And even in the last couple of months there's been a lot of development in the containerization world, so there's a even more to include.
If anyone's interested in hosting and/or filming an updated version of this talk, drop me a line! My email is in my profile.
Re: Docker without Docker
#10What is the actual difference here between using debootstrap and LXC?