Merge "Adding glossary.rst"
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Zuul
@ -59,6 +59,7 @@ User Documentation
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:maxdepth: 1
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user/index
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user/glossary.rst
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Contributor Guide
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=================
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doc/source/user/glossary.rst
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doc/source/user/glossary.rst
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========
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Glossary
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========
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Magnum Terminology
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~~~~~~~~~~~~~~~~~~
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.. glossary::
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Cluster (previously Bay)
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A cluster is the construct in which Magnum launches container orchestration
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engines. After a cluster has been created the user is able to add containers
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to it either directly, or in the case of the Kubernetes container
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orchestration engine within pods - a logical construct specific to that
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implementation. A cluster is created based on a ClusterTemplate.
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ClusterTemplate (previously BayModel)
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A ClusterTemplate in Magnum is roughly equivalent to a flavor in Nova. It
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acts as a template that defines options such as the container orchestration
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engine, keypair and image for use when Magnum is creating clusters using
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the given ClusterTemplate.
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Container Orchestration Engine (COE)
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A container orchestration engine manages the lifecycle of one or more
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containers, logically represented in Magnum as a cluster. Magnum supports a
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number of container orchestration engines, each with their own pros and cons,
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including Docker Swarm, Kubernetes, and Mesos.
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Labels
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Labels is a general method to specify supplemental parameters that are
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specific to certain COE or associated with certain options. Their
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format is key/value pair and their meaning is interpreted by the
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drivers that uses them.
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Cluster Drivers
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A cluster driver is a collection of python code, heat templates, scripts,
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images, and documents for a particular COE on a particular distro. Magnum
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presents the concept of ClusterTemplates and clusters. The implementation
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for a particular cluster type is provided by the cluster driver. In other
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words, the cluster driver provisions and manages the infrastructure for the
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COE.
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Kubernetes Terminology
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~~~~~~~~~~~~~~~~~~~~~~
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.. glossary::
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Kubernetes uses a range of terminology that we refer to in this guide. We
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define these common terms for your reference:
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Pod
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When using the Kubernetes container orchestration engine, a pod is the
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smallest deployable unit that can be created and managed. A pod is a
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co-located group of application containers that run with a shared context.
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When using Magnum, pods are created and managed within clusters. Refer to the
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`pods section
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<https://kubernetes.io/docs/concepts/workloads/pods/pod-overview/>`_ in the `Kubernetes
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User Guide`_ for more information.
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Replication controller
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A replication controller is used to ensure that at any given time a certain
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number of replicas of a pod are running. Pods are automatically created and
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deleted by the replication controller as necessary based on a template to
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ensure that the defined number of replicas exist. Refer to the `replication
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controller section
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<http://kubernetes.io/v1.0/docs/user-guide/replication-controller.html>`_ in
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the `Kubernetes User Guide`_ for more information.
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Service
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A service is an additional layer of abstraction provided by the Kubernetes
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container orchestration engine which defines a logical set of pods and a
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policy for accessing them. This is useful because pods are created and
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deleted by a replication controller, for example, other pods needing to
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discover them can do so via the service abstraction. Refer to the
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`services section
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<http://kubernetes.io/v1.0/docs/user-guide/services.html>`_ in the
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`Kubernetes User Guide`_ for more information.
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.. _Kubernetes User Guide: http://kubernetes.io/v1.0/docs/user-guide/
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@ -34,28 +34,6 @@ created and managed by Magnum to support the COE's.
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#. `Container Monitoring`_
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#. `Kubernetes External Load Balancer`_
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Terminology
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===========
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Cluster (previously Bay)
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A cluster is the construct in which Magnum launches container orchestration
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engines. After a cluster has been created the user is able to add containers
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to it either directly, or in the case of the Kubernetes container
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orchestration engine within pods - a logical construct specific to that
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implementation. A cluster is created based on a ClusterTemplate.
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ClusterTemplate (previously BayModel)
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A ClusterTemplate in Magnum is roughly equivalent to a flavor in Nova. It
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acts as a template that defines options such as the container orchestration
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engine, keypair and image for use when Magnum is creating clusters using
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the given ClusterTemplate.
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Container Orchestration Engine (COE)
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A container orchestration engine manages the lifecycle of one or more
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containers, logically represented in Magnum as a cluster. Magnum supports a
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number of container orchestration engines, each with their own pros and cons,
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including Docker Swarm, Kubernetes, and Mesos.
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Overview
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========
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@ -974,37 +952,8 @@ look for the attribute *coe_version* and *container_version*::
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Kubernetes
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==========
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Kubernetes uses a range of terminology that we refer to in this guide. We
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define these common terms for your reference:
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Pod
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When using the Kubernetes container orchestration engine, a pod is the
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smallest deployable unit that can be created and managed. A pod is a
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co-located group of application containers that run with a shared context.
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When using Magnum, pods are created and managed within clusters. Refer to the
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`pods section
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<http://kubernetes.io/v1.0/docs/user-guide/pods.html>`_ in the `Kubernetes
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User Guide`_ for more information.
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Replication controller
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A replication controller is used to ensure that at any given time a certain
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number of replicas of a pod are running. Pods are automatically created and
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deleted by the replication controller as necessary based on a template to
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ensure that the defined number of replicas exist. Refer to the `replication
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controller section
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<http://kubernetes.io/v1.0/docs/user-guide/replication-controller.html>`_ in
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the `Kubernetes User Guide`_ for more information.
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Service
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A service is an additional layer of abstraction provided by the Kubernetes
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container orchestration engine which defines a logical set of pods and a
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policy for accessing them. This is useful because pods are created and
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deleted by a replication controller, for example, other pods needing to
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discover them can do so via the service abstraction. Refer to the
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`services section
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<http://kubernetes.io/v1.0/docs/user-guide/services.html>`_ in the
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`Kubernetes User Guide`_ for more information.
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.. _Kubernetes User Guide: http://kubernetes.io/v1.0/docs/user-guide/
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define these common terms in the `Glossary
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<https://docs.openstack.org/magnum/latest/glossary.html>`_ for your reference.
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When Magnum deploys a Kubernetes cluster, it uses parameters defined in the
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ClusterTemplate and specified on the cluster-create command, for example::
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