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Docker 0.7 runs on all Linux distributions

blog.docker.io

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Re: Docker 0.7 runs on all Linux distributions

#61

Post by salient »

shykes wrote: post #13
andyl wrote: post #6

Earlier quoted context omitted.

does this mean that docker will run on 32 bit systems ?

Not yet, but that's coming very soon. We've been artificially limiting the number of architectures supported to limit the headache of managing cross-arch container images. We're reaching the point where that will no longer be a problem - meanwhile the Docker on Raspberry Pi community is growing restless and we want to make them happy :)

For your sake, you better hope there won't be another ARMv7 and also ARMv8 version of Raspberry Pi, too :)

Re: Docker 0.7 runs on all Linux distributions

#62

Post by sandGorgon »

shykes wrote: post #48
knitatoms wrote: post #24

Earlier quoted context omitted.

Any drawbacks to using lvm comapared to AUFS? I'd like to switch to Debian from Ubuntu - will I notice any performance differences or other restrictions?

There is a slight performance overhead with lvm, but nothing dramatic. The other advantage of the AUFS driver is that it is more proven. If you have a way to get aufs on your system (and I believe debian does), my pragmatic ops advice would be to use that and give the other drivers some time to get hardened. Of course my advice as a maintainer is that all of them are equally awesome :)

how would you compare aufs/lvm performance vs with the upcoming btrfs support? That is the one that I presume will have the most long term continuity because of btrfs becoming the default sooner than later (isnt it already for opensuse/fedora ?)

Re: Docker 0.7 runs on all Linux distributions

#63

Post by mateuszf »

dman wrote: post #36
mateuszf wrote: post #26

Earlier quoted context omitted.

You will be able to have multiple Ubuntu servers running on one Ubuntu VPS on Digital Ocean. Each of them may have some initial state (installed some software, configuration) that you will be able to spawn as separate virtual machine. The "inside" machine will consume mnimal amount of memory (for running applications) and not for whole OS as in case of "real virtual machine". Also, you will be able to spawn and destr…

What does the vm abstraction buy you vs processes? If one entity "owns" all the servers what is the draw in seperating the servers out in their own VM?

High speed, low memory consumption with proper snapshots/separation.

Re: Docker 0.7 runs on all Linux distributions

#64

Post by mclarke »

Sprint wrote: post #14

I looked at it several times but never really got it. Can I use Docker to isolate different servers (think http, xmpp, another http on another port) on a server so that if one of them was exploited, the attacker would be constrained to inside the container? Or is it "just" of a convenient way to put applications into self-contained packages?

I wrote up some thoughts yesterday on Docker's value as a tool in continuous integration testing which might find interesting: http://mike-clarke.com/2013/11/applied-docker-continuous-int...

Re: Docker 0.7 runs on all Linux distributions

#65

Post by derefr »

dman wrote: post #36
mateuszf wrote: post #26

Earlier quoted context omitted.

You will be able to have multiple Ubuntu servers running on one Ubuntu VPS on Digital Ocean. Each of them may have some initial state (installed some software, configuration) that you will be able to spawn as separate virtual machine. The "inside" machine will consume mnimal amount of memory (for running applications) and not for whole OS as in case of "real virtual machine". Also, you will be able to spawn and destr…

What does the vm abstraction buy you vs processes? If one entity "owns" all the servers what is the draw in seperating the servers out in their own VM?

You don't have to think of them as VMs, that's just a simplification for the sake of the conversation. They're resource-isolated process groups. It's exactly the same idea as the original Unix-paradigm security approach of making each service run under a separate system-uid, but with a much more complete isolation.

Re: Docker 0.7 runs on all Linux distributions

#66

Post by sown »

shykes wrote: post #40
sown wrote: post #33

Hey, docker newb here. Can I easily put my own software in it? I've got this c++ program that has a few dependencies in ubuntu.

The easiest way is to add a Dockerfile to your source repository, and use 'docker build' to create a container image from it. Documentation link: http://docs.docker.io/en/master/use/builder/

Hmm. this is good. but my build environment is kind of wonky.

Can I just hand it a .tar.gz and say, put it in /usr/asdf and let it run? What about python scripts? Maybe I just give it a location to an RPM? like in this document?

http://docs.docker.io/en/master/examples/python_web_app/

Re: Docker 0.7 runs on all Linux distributions

#67

Post by dmunoz »

Nice to see Docker 0.7 hit with some very useful changes.

I see lots of people are getting some generic Docker questions answered in here, and want to ask one I have been wondering about.

What is the easiest way to use dockers like I would virtual machines? I want to boot an instance, make some changes e.g. apt-get install or edit config files, shutdown the instance, and have the changes available next time I boot that instance. Unless I misunderstand something, Docker requires me to take snapshots of the running instance before I shut it down, which takes an additional terminal window if I started into the instance with something like docker run -i -t ubuntu /bin/bash. I know there are volumes that I can attach/detach to instances, but this doesn't help for editing something like /etc/ssh/sshd_config.

Re: Docker 0.7 runs on all Linux distributions

#68

Post by dgregd »

shykes wrote: post #2

A few details on the "standard linux support" part. To remove the hard dependency on the AUFS patches, we moved it to an optional storage driver, and shipped a second driver which uses thin LVM snapshots (via libdevmapper) for copy-on-write. The big advantage of devicemapper/lvm, of course, is that it's part of the mainline kernel. If your system supports AUFS, Docker will continue to use the AUFS driver. Otherwise i…

When it will be "production ready"? It seems that the schedule in "GETTING TO DOCKER 1.0" post is outdated.

Re: Docker 0.7 runs on all Linux distributions

#69

Post by PetrolMan »

sown wrote: post #33

Hey, docker newb here. Can I easily put my own software in it? I've got this c++ program that has a few dependencies in ubuntu.

I couldn't reply to your deeper comment so I'm going to do it here. You can use the Dockerfile to copy files from you local system onto the image and then run various commands on the image. You have access to a full linux environment inside the docker image so you can do anything on the image that you can do in your normal development environment.
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