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adding glossary items "layer" and "namespace" (#2976)

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Subodh Dharmadhikari 2017-04-21 15:30:26 -04:00 committed by Misty Stanley-Jones
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commit 881d56e841
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@ -150,6 +150,12 @@ Kitematic: |
A legacy GUI, bundled with [Docker Toolbox](#toolbox), for managing Docker
containers. We recommend upgrading to [Docker for Mac](#docker-for-mac) or
[Docker for Windows](#docker-for-windows/), which have superseded Kitematic.
layer: |
In an image, a layer is modification to the image, represented by an instruction in the
Dockerfile. Layers are applied in sequence to the base image to create the final image.
When an image is updated or rebuilt, only layers that change need to be updated, and
unchanged layers are cached locally. This is part of why Docker images are so fast
and lightweight. The sizes of each layer add up to equal the size of the final image.
libcontainer: |
libcontainer provides a native Go implementation for creating containers with
namespaces, cgroups, capabilities, and filesystem access controls. It allows
@ -170,6 +176,15 @@ Machine: |
installs Docker on them, then configures the Docker client to talk to them.
*Also known as : docker-machine*
namespace: |
A [Linux namespace](http://man7.org/linux/man-pages/man7/namespaces.7.html){: target="_blank" class="_"}
is a Linux kernel feature that isolates and vitualizes system resources. Processes which restricted to
a namespace can only interact with resources or processes that are part of the same namespace. Namespaces
are an important part of Docker's isolation model. Namespaces exist for each type of
resource, including `net` (networking), `mnt` (storage), `pid` (processes), `uts` (hostname control),
and `user` (UID mapping). For more information about namespaces, see [Docker run reference](/engine/reference/run.md)
and [Introduction to user namespaces](https://success.docker.com/KBase/Introduction_to_User_Namespaces_in_Docker_Engine){ :target="_blank" class="_" }.
node: |
A [node](/engine/swarm/how-swarm-mode-works/nodes/) is a physical or virtual
machine running an instance of the Docker Engine in swarm mode.