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DevOps & observability · #kubernetes
Feature state: Stable since Kubernetes v1.20 Kubernetes allow you to limit the number of process IDs (PIDs) that a Pod can use. You can also reserve a number of allocatable PIDs for each node for use by the operating system and daemons (rather than by Pods). Process IDs (PIDs) are a fundamental reso
Started · 27 Dec 2021, 23:26 UTC
This page describes good practices when configuring a Kubernetes cluster utilizing Dynamic Resource Allocation (DRA). These instructions are for cluster administrators. Separate permissions to DRA related APIs DRA is orchestrated through a number of different APIs. Use authorization tools (like RBAC
Feature state: Stable since Kubernetes v1.37 More information about this feature This is a stable feature in Kubernetes, and has been since version v1.37. It was first available in the v1.35 release. You can no longer disable or opt out of this feature or behavior (it is locked); if you explicitly s
Distributed systems often have a need for leases , which provide a mechanism to lock shared resources and coordinate activity between members of a set. In Kubernetes, the lease concept is represented by Lease objects in the coordination.k8s.io API Group , which are used for system-critical capabilit
You can constrain a Pod so that it is restricted to run on particular node(s) , or to prefer to run on particular nodes. There are several ways to do this and the recommended approaches all use label selectors to facilitate the selection. Often, you do not need to set any such constraints; the sched
kube-state-metrics, an add-on agent to generate and expose cluster-level metrics. The state of Kubernetes objects in the Kubernetes API can be exposed as metrics. An add-on agent called kube-state-metrics can connect to the Kubernetes API server and expose a HTTP endpoint with metrics generated from
Each object in your cluster has a Name that is unique for that type of resource. Every Kubernetes object also has a UID that is unique across your whole cluster. For example, you can only have one Pod named myapp-1234 within the same namespace , but you can have one Pod and one Deployment that are e
The CRI is a plugin interface which enables the kubelet to use a wide variety of container runtimes, without having a need to recompile the cluster components. You need a working container runtime on each Node in your cluster, so that the kubelet can launch Pods and their containers. The Container R
Labels are key/value pairs that are attached to objects such as Pods. Labels are intended to be used to specify identifying attributes of objects that are meaningful and relevant to users, but do not directly imply semantics to the core system. Labels can be used to organize and to select subsets of