On 09/07/2014 11:22 PM, Dusty Mabe wrote:
Hi All,
Per discussion in the #fedora-cloud meeting last Friday I would like to
start a thread about the names of the Docker and Atomic deliverables for F21.
I know of at least a few cases where there has been confusion regarding
what deliverable has been the subject of a conversation on IRC as a result
of the current terminology. I've seen the docker and atomic referred to as:
Docker Image
Atomic Image
Docker Host Image
etc...
It seems like the one that sparks the most confusion is "Docker Image".
Usually when I see "Image" I think a VM bootable image (i.e. virtualization,
not containers/Docker). A progression from that misunderstanding could lead
one to think that "Docker Image" is the VM disk image I can use to boot a
host that will run the Docker daemon and thus run containers.
I think it would be nice to help ourselves and our users along by separating
the terminology a bit such that it is hard to confuse what is a VM disk
image vs. what is an image for use with Docker.
Here is a first stab at trying to make things clearer:
Docker Container Image - base container image - can be used with docker
Atomic Image - minimal OS, Atomic updates, aka 'Docker Host'
I've always thought container and image were two distinct things.
Here's my take:
The image is the disk that is being used. The container is the
Operating System construct. The Two combinded are the instance.
"My instance is a Fedora 21 base image running inside a KVM container."
"My instance is a Docker image of JBoss with RHQ in it running in a
container on CentOS 7"
Now...I realize that Docker does not see things this way. Docker
containers are trying to be like a CONEX
(http://en.wikipedia.org/wiki/Intermodal_container) that gets stuck on
the back of a train, a long haul truck, or a Maersk Oceanic Cargo Ship.
I think this acutally confuses things myself.
In a nutshell, it would be great if we added "Container" to references we
make to the container image (in conversation and docs).
Thoughts?
Dusty
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