The KCNA Book by Nigel Poulton

Author:Nigel Poulton [Nigel Poulton]
Language: eng
Format: epub
Publisher: leanpub.com
Published: 2022-02-15T00:00:00+00:00

Affinity rules let you schedule pods onto particular nodes, or nodes that are running particular pods. Anti-affinity does the opposite – it lets you tell the scheduler not to run pods on particular nodes, or nodes already running particular pods. Think of affinity and anti-affinity rules as being like magnets that can either attract or repel pods from particular nodes – affinity rules attract pods to particular nodes, whereas anti-affinity rules repel pods from particular nodes.

Pod topology spread constraints let you balance pods across user-defined failure domains. They’re an important tool for achieving application high availability.

The scheduler can also target pods at nodes with specific container runtimes. For example, you can tell Kubernetes that certain workloads should only run on nodes with the gVisor runtime. It can also schedule containers to nodes with access to certain storage volumes.

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