[Stanislaw Lem] His Master’s Voice

  • Title: His Master’s Voice
  • Author: Stanislaw Lem
  • Published: 1967
  • Translated: by Michael Kandel
  • Publisher: Pro Auctore Wojciech Zemek
  • ISBN: 978-83-63471-56-9

That no life lives for ever;
That dead men rise up never;
…
Only the sleep eternal
In an eternal night

from the book
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[Kubernetes] Services

A Service is an abstraction which defines a logical set of Pods and a policy by which to access them (sometimes this pattern is called a micro-service).

  • A service provides a single point of entry for accessing one or more pods.
    • Pods are ephemeral and may only live a short time. For example, each pod gets its own IP address and you cannot rely on a pod id address staying the same.
  • A service creates endpoints between the service and pods.
  • The set of pods targeted by a service is usually determined by a selector.

Service | Kubernetes

  • The roles of a service
    • abstracts pod IP addresses.
    • works on TCP/UDP (OSI Layer 4). kube-proxy creates a virtual IP for services.
    • relies on labels to associate a service with a pod.
    • provides load balancing among pods.
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[Kubernetes] Basics

Kubernetes coordinates a highly available cluster of computers that are connected to work as a single unit. Kubernetes automates the distribution and scheduling of application containers across a cluster in an efficient way.

  • Service discovery and load balancing
  • Storage orchestration
  • Automated rollouts and rollbacks
  • Self-healing
  • Secret and configuration management
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