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Kubernetes API Concepts

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• The Kubernetes API is a resource-based(Rest ful)
  programmatic interface provided via HTTP. It
  supports retrieving, creating, updating, and
  deleting primary resources via the standard HTTP
  verbs (POST, PUT, PATCH, DELETE, GET), includes
  additional sub resources for many objects that
  allow fine grained authorization (such as binding
  a pod to a node), and can accept and serve those
  resources in different representations for
  convenience or efficiency.

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Standard API terminology
1. Most Kubernetes API resource types are
objects they represent a concrete
instance of a concept on the cluster, like a pod
or namespace. 2. A smaller number of API
resource types are virtual they often
represent operations rather than objects, such as
a permission check. 3. All objects will have a
unique name to allow idempotent creation and
retrieval, but virtual resource types may not
have unique names if they are not retrievable or
do not rely on idem potency.
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• Kubernetes generally leverages standard Restful
  terminology to describe the API concepts
• A resource type is the name used in the URL
  (pods, namespaces, services)
• All resource types have a concrete representation
  in JSON (their object schema) which is called
  a kind
• A list of instances of a resource type is known
  as a collection
• A single instance of the resource type is called
  a resource

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Efficient detection of changes

• To enable clients to build a model of the current
  state of a cluster, all Kubernetes object
  resource types are required to support consistent
  lists and an incremental change notification feed
  called a watch.
• Every Kubernetes object has a resource Version
  field representing the version of that resource
  as stored in the underlying database.
• When retrieving a collection of resources
  (either namespace or cluster scoped), the
  response from the server will contain a resource
  Version value that can be used to initiate a
  watch against the server.

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• The server will return all changes (creates,
  deletes, and updates) that occur after the
  supplied resource Version.
• This allows a client to fetch the current state
  and then watch for changes without missing any
  updates.
• If the client watch is disconnected they can
  restart a new watch from the last returned
  resource Version or perform a new collection
  request and begin again.

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Contact
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