openstack/magnum
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Merge "Add Pod, Service, Replication Controller terms"

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Jenkins 2016-02-03 04:29:14 +00:00 committed by Gerrit Code Review
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doc/source/userguide.rst
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@ -54,6 +54,34 @@ Container Orchestration Engine (COE)
number of container orchestration engines, each with their own pros and cons,
including Docker Swarm, Kubernetes, and Mesos.
Pod
When using the Kubernetes container orchestration engine, a pod is the
smallest deployable unit that can be created and managed. A pod is a
co-located group of application containers that run with a shared context.
When using Magnum, pods are created and managed within bays. Refer to the
`Kubernetes User Guide
<http://kubernetes.io/v1.0/docs/user-guide/pods.html>`__ for more
information.
Replication controller
A replication controller is used to ensure that at any given time a certain
number of replicas of a pod are running. Pods are automatically created and
deleted by the replication controller as necessary based on a template to
ensure that the defined number of replicas exist. Refer to the `Kubernetes
User Guide
<http://kubernetes.io/v1.0/docs/user-guide/replication-controller.html>`__
for more information.
Service
A service is an additional layer of abstraction provided by the Kubernetes
container orchestration engine which defines a logical set of pods and a
policy for accessing them. This is useful because pods are created and
deleted by a replication controller, for example, other pods needing to
discover them can do so via the service abstraction. Refer to the
`Kubernetes User Guide
<http://kubernetes.io/v1.0/docs/user-guide/services.html>`__ for more
information.
========
Overview
========