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Take the Kubernetes API for a Spin

For anyone who is fascinated by distributed computing, Kubernetes provides an ultimate playground. It’s one of best implementations of cluster management software of our times. Google must be appreciated for not only open sourcing Kubernetes, but also simplifying it, and making it accessible to the developers.

At the heart of Kubernetes is an application programming interface (API). In fact, everything and anything in the platform is treated as an API object. Tasks such as the creation and deletion of pods, services, and replica sets are all translated into appropriate REST API calls.

This article discovers the hidden gems of Kubernetes API along with a detailed walkthrough. To get more from this tutorial, you are advised to spin up a cluster for yourself.

Architecture & Background

One of the key components of Kubernetes control plane is the API server. It is responsible for dealing with the REST operations while providing the front-end to the cluster’s shared state through which all other components interact. Every operation that involves changing the state of a Kubernetes objects such as a Pod goes through the API server.

Kubectl, the command line interface to Kubernetes, is a simple yet powerful client of this API.

The lesser known fact is that there are multiple client libraries available for the Kubernetes API. While the Go client is the official one, there are 3rd party clients for Node.js, PHP, Python, and Java available on Github.

In a typical Kubernetes cluster, the API is exposed on port 443, which can be accessed through a TLS connection. The self-signed certificate, which is generated during the cluster creation or configuration, is available at $USER/.kube/config on the user’s machine. But the access to the API server can be simplified through the proxy, which we will configure in the tutorial.

The API server performs authentication, authorization, and admission control of clients. Refer to Kubernetes API documentation for more details.

Read the entire article at The New Stack.

Janakiram MSV is an analyst, advisor, and architect. Follow him on Twitter,  Facebook and LinkedIn.

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Janakiram MSV heads the Cloud Infrastructure Services at Aditi Technologies. He was the founder and CTO of Get Cloud Ready Consulting, a niche Cloud Migration and Cloud Operations firm that recently got acquired by Aditi Technologies. In his current role, he leads a highly talented engineering team that focuses on migrating and managing applications deployed on Amazon Web Services and Microsoft Windows Azure Infrastructure Services.
Janakiram is an industry analyst with deep understanding of Cloud services. Through his speaking, writing and analysis, he helps businesses take advantage of the emerging technologies. He leverages his experience of engaging with the industry in developing informative and practical research, analysis and authoritative content to inform, influence and guide decision makers. He analyzes market trends, new products / features, announcements, industry happenings and the impact of executive transitions.
Janakiram is one of the first few Microsoft Certified Professionals on Windows Azure in India. Demystifying The Cloud, an eBook authored by Janakiram is downloaded more than 100,000 times within the first few months. He is the Chief Editor of a popular portal on Cloud called www.CloudStory.in that covers the latest trends in Cloud Computing. Janakiram is an analyst with the GigaOM Pro analyst network where he analyzes the Cloud Services landscape. He is a guest faculty at the International Institute of Information Technology, Hyderabad (IIIT-H) where he teaches Big Data and Cloud Computing to students enrolled for the Masters course. As a passionate speaker, he has chaired the Cloud Computing track at premier events in India.
He has been the keynote speaker at many premier conferences, and his seminars are attended by thousands of architects, developers and IT professionals. His sessions are rated among the best in every conference he participates.
Janakiram has worked at the world-class product companies including Microsoft Corporation, Amazon Web Services and Alcatel-Lucent. Joining as the first employee of Amazon Web Services in India, he was the AWS Technology Evangelist. Prior to that, Janakiram spent 10 years at Microsoft Corporation where he was involved in selling, marketing and evangelizing the Microsoft Application Platform and Tools.