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Update architecture.md

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Brian Grant 2017-02-27 12:53:38 -08:00 committed by GitHub
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contributors/design-proposals/architecture.md
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@ -176,12 +176,8 @@ available desired resources.
The Kubernetes node has the services necessary to run application containers and
be managed from the master systems.
Each node runs a container runtime (like docker, rkt, or Hyper). The container
runtime is responsible for downloading images and running containers.
#### Kubelet
The most important and most prominent controller in Kubernetes is the Kubelet, which is the
primary implementer of the Pod and Node APIs that drive the container execution layer. Without
these APIs, Kubernetes would just be a CRUD-oriented REST application framework backed by a
@ -201,11 +197,21 @@ concerns, and migration from physical/virtual machines. The Pod primitive is key
[primary benefits](https://kubernetes.io/docs/whatisk8s/#why-containers) of deployment on modern
cloud platforms, such as Kubernetes.
Kubelet also currently links in the [cAdvisor](https://github.com/google/cadvisor) resource monitoring
agent.
#### Container runtime
TODO
Each node runs a container runtime, which is responsible for downloading images and running containers.
#### `kube-proxy`
Kubelet does not link in the base container runtime. Instead, we're defining a [Container Runtime Interface]
(container-runtime-interface-v1.md) to control the underlying runtime and facilitate pluggability of that layer.
This decoupling is needed in order to maintain clear component boundaries, facilitate testing, and facilitate pluggability.
Runtimes supported today, either upstream or by forks, include at least docker (for Linux and Windows),
[rkt](https://kubernetes.io/docs/getting-started-guides/rkt/),
[cri-o](https://github.com/kubernetes-incubator/cri-o), and [frakti](https://github.com/kubernetes/frakti).
#### Kube Proxy
The [service](https://kubernetes.io/docs/user-guide/services/) abstraction provides a way to
group pods under a common access policy (e.g., load-balanced). The implementation of this creates