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DevOps & observability · #kubernetes
Kubernetes can be configured to use swap memory on a node , allowing the kernel to free up physical memory by swapping out pages to backing storage. This is useful for multiple use-cases. For example, nodes running workloads that can benefit from using swap, such as those that have large memory foot
Started · 27 Oct 2025, 20:59 UTC
The Kubernetes API server stores objects, relying on an etcd-compatible backing store (often, the backing storage is etcd itself). Each object is serialized using a particular version of that API type; for example, the v1 representation of a ConfigMap. Kubernetes uses the term storage version to des
The kubectl command-line tool supports several different ways to create and manage Kubernetes objects . This document provides an overview of the different approaches. Read the Kubectl book for details of managing objects by Kubectl. Management techniques Warning: A Kubernetes object should be manag
Feature state: Stable since Kubernetes v1.24 When you run a Pod on a Node, the Pod itself takes an amount of system resources. These resources are additional to the resources needed to run the container(s) inside the Pod. In Kubernetes, Pod Overhead is a way to account for the resources consumed by
Feature state: Stable since Kubernetes v1.20 This page describes the RuntimeClass resource and runtime selection mechanism. RuntimeClass is a feature for selecting the container runtime configuration. The container runtime configuration is used to run a Pod's containers. Motivation You can set a dif
Managing alert volume in a large-scale Argo CD deployment requires balancing visibility with notification noise. The Argo CD Notifications controller allows for trigger definitions based on application status changes, but default configurations often emit redundant messages during the reconciliation process. The goal is to ensure that notifications are only
When implementing custom controllers in Kubernetes (v1.28+), ensuring that retried write operations do not result in duplicate resources or overwritten data is critical. The API server utilizes optimistic concurrency control via the resourceVersion field to prevent conflicting updates during PUT requests. While resourceVersion manages updates, the behavior f
This page describes device taints and tolerations in DRA, which let drivers and admins keep Pods off specific devices, or evict Pods already using them. Device taints and tolerations Feature state: Stable since Kubernetes v1.37 More information about this feature This is a stable feature in Kubernet
When you specify a Pod , you can optionally specify how much of each resource a container needs. The most common resources to specify are CPU and memory (RAM); there are others. When you specify the resource request for containers in a Pod, the kube-scheduler uses this information to decide which no
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