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What about non-Linux platforms (FreeBSD, Mac OS X with a kext)? One thing that I believe Docker has failed at is in taking a purely declarative approach to ima

What about non-Linux platforms (FreeBSD, Mac OS X with a kext)? One thing that I believe Docker has failed at is in taking a purely declarative approach to image definition; rather than specifying the packages that are assembled/inserted to create the container, Docker ships around non-portable Linux binaries.

tachion 12y ago
I second that. At the begining Docker people were mentioning adding FreeBSD Jails support, what seemed to me an awesome thing, a platform independent containerization middleware, but recently they just seemt to forget about it and they're doing only linux-centric things - what a shame.
- bcantrill 12y ago
  Yes, but the Docker Remote API allows for a great deal of implementation freedom -- including running on a different OS substrate. We're doing this with sdc-docker[1] to run Docker on top of SmartOS and in a SmartOS container, and the Docker folks have been incredibly supportive. Despite the rhetoric, Rocket appears to be much more bound to the OS platform than Docker -- and given @philips' comment that "part of the design difference is that rocket doesn't implement an API"[2], this binding appears to be deliberate. [1] https://github.com/joyent/sdc-docker https://github.com/joyent/sdc-docker [2] https://news.ycombinator.com/item?id=8682798 https://news.ycombinator.com/item?id=8682798
  - cbsmith 12y ago
    It depends on how you look at it. The Docker Remote API provides an abstraction on the OS substrate and definitely binds you a lot more to Docker and their model. The "rocket doesn't implement an API" means all that it isn't really doing much more than kicking off the container and using the existing OS substrate to manage everything else. I can see where for SmartOS & Windows the Docker approach is more flexible. If someone has already settled on Linux, but they have their own ideas about how to manage containers within Linux that have nothing to do with CoreOS, the Rocket model is going to leave them much more flexibility.
  - jacques_chester 12y ago
    Have you ever considered doing a Warden backend for SmartOS? It'd make Cloud Foundry run out of the box, as I understand it. Disclaimer: while I work on CF, I'm not that close to the Warden nitty-gritty.

tachion 12y ago

I second that. At the begining Docker people were mentioning adding FreeBSD Jails support, what seemed to me an awesome thing, a platform independent containerization middleware, but recently they just seemt to forget about it and they're doing only linux-centric things - what a shame.

bcantrill 12y ago
Yes, but the Docker Remote API allows for a great deal of implementation freedom -- including running on a different OS substrate. We're doing this with sdc-docker[1] to run Docker on top of SmartOS and in a SmartOS container, and the Docker folks have been incredibly supportive. Despite the rhetoric, Rocket appears to be much more bound to the OS platform than Docker -- and given @philips' comment that "part of the design difference is that rocket doesn't implement an API"[2], this binding appears to be deliberate. [1] https://github.com/joyent/sdc-docker https://github.com/joyent/sdc-docker [2] https://news.ycombinator.com/item?id=8682798 https://news.ycombinator.com/item?id=8682798
- cbsmith 12y ago
  It depends on how you look at it. The Docker Remote API provides an abstraction on the OS substrate and definitely binds you a lot more to Docker and their model. The "rocket doesn't implement an API" means all that it isn't really doing much more than kicking off the container and using the existing OS substrate to manage everything else. I can see where for SmartOS & Windows the Docker approach is more flexible. If someone has already settled on Linux, but they have their own ideas about how to manage containers within Linux that have nothing to do with CoreOS, the Rocket model is going to leave them much more flexibility.
- jacques_chester 12y ago
  Have you ever considered doing a Warden backend for SmartOS? It'd make Cloud Foundry run out of the box, as I understand it. Disclaimer: while I work on CF, I'm not that close to the Warden nitty-gritty.