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DevOps & observability · #kubernetes
This page describes the resources available to Containers in the Container environment. Container environment The Kubernetes Container environment provides several important resources to Containers: A filesystem, which is a combination of an image and one or more volumes . Information about the Cont
Started · 14 Sept 2023, 16:46 UTC
On Linux, control groups constrain resources that are allocated to processes. The kubelet and the underlying container runtime need to interface with cgroups to enforce resource management for pods and containers which includes cpu/memory requests and limits for containerized workloads. There are tw
Custom resources are instances of resource types added to Kubernetes through API extensions. This page discusses when to add a custom resource to your Kubernetes cluster and when to use a standalone service. It describes the two methods for adding custom resources and how to choose between them. Cus
Node-pressure eviction is the process by which the kubelet proactively terminates pods to reclaim resource on nodes. The kubelet monitors resources like memory, disk space, and filesystem inodes on your cluster's nodes. When one or more of these resources reach specific consumption levels, the kubel
The aggregation layer allows Kubernetes to be extended with additional APIs, beyond what is offered by the core Kubernetes APIs. The additional APIs can either be ready-made solutions such as a metrics server , or APIs that you develop yourself. The aggregation layer is different from Custom Resourc
API-initiated eviction is the process by which you use the Eviction API to create an Eviction object that triggers graceful pod termination. You can request eviction by calling the Eviction API directly, or programmatically using a client of the API server , like the kubectl drain command. This crea
Recommendations for designing and deploying admission webhooks in Kubernetes. This page provides good practices and considerations when designing admission webhooks in Kubernetes. This information is intended for cluster operators who run admission webhook servers or third-party applications that mo
Finalizers are namespaced keys that tell Kubernetes to wait until specific conditions are met before it fully deletes resources that are marked for deletion. Finalizers alert controllers to clean up resources the deleted object owned. When you tell Kubernetes to delete an object that has finalizers
In Kubernetes, some objects are owners of other objects. For example, a ReplicaSet is the owner of a set of Pods. These owned objects are dependents of their owner. Ownership is different from the labels and selectors mechanism that some resources also use. For example, consider a Service that creat