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- WHAT IS KUBERNETES API SERVER HOW TO
- WHAT IS KUBERNETES API SERVER SOFTWARE
- WHAT IS KUBERNETES API SERVER CODE
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Special purpose kinds are for example used for specific actions on objects and for non-persistent entities such as /binding or /status, discovery uses APIGroup and APIResource, error results use Status, etc.ĪPI Group is a collection of Kinds that are logically related.Lists have a limited set of common metadata. Lists are collections of resources of one or more kinds of entities.An object may have multiple resources that clients can use to perform specific actions. Objects represent a persistent entity in the system.Each object has a field Kind which tells a client-such as kubectl or oc-that it represents, for example, a pod: apiVersion: v1 make up the objects of the Kubernetes type universe. Primitives like pods, services, endpoints, deployment, etc. TerminologyĪfter this brief overview of the API Server and the HTTP API space and its properties, we now define the terms used in this context more formally. A specification is a complete description of the desired state and is persisted in stable storage. Most API objects make a distinction between the specification of the desired state of the object and the status of the object at the current time. In general the Kubernetes API supports create, update, delete, and retrieve operations at the given path via the standard HTTP verbs POST, PUT, DELETE, and GET with JSON as the default payload. Now we turn our attention to an exemplary interaction with the API (we are using Minishift and the proxy command oc proxy -port=8080 here to get direct access to the API): $ curl Īnd further, using the new, alpha version: $ curl In Kubernetes 1.5, two versions of batch operations exist: /apis/batch/v1 and /apis/batch/v2alpha1, exposing different sets of entities that can be queried and manipulated. Going forward we’ll be focusing on a concrete example: batch operations. At the top level we distinguish between the core group (everything below /api/v1, for historic reasons under this path and not under /apis/core/v1), the named groups (at path /apis/$NAME/$VERSION) and system-wide entities such as /metrics.Ī part of the HTTP API space (based on v1.5) is shown in the following: Let’s now have a look at how the HTTP API space is constructed.
WHAT IS KUBERNETES API SERVER SOFTWARE
Stable level, for example, v1 will appear in released software for many subsequent versions.
WHAT IS KUBERNETES API SERVER CODE
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It provides the following core functionality: The API Server is the central management entity and the only component that directly talks with the distributed storage component etcd.
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The control plane on the master node(s) consists of the API Server, the Controller Manager and Scheduler(s). On a conceptual level, Kubernetes is made up of a bunch of nodes with different roles. Future posts will cover storage-related topics and extensibility points of the API Server. In this installment, we start with a general introduction of the Kubernetes API Server, provide some terminology and explain the API request flow. Familiarity with Go is an advantage but not a hard requirement to follow along. Also, if you want to extend Kubernetes or start contributing to the project, you might benefit from it.
WHAT IS KUBERNETES API SERVER HOW TO
If you’re interested in the inner workings of Kubernetes and how to debug it, this blog post series is for you. We, that is, Stefan Schimanski (Engineering) and Michael Hausenblas (Advocacy), will dive into specific aspects of Kubernetes and how they’re utilized within OpenShift. Welcome to the Kubernetes deep dive blog post series.