Kubernetes v1.24 releases, container cluster management system
Kubernetes is an open-source system for managing containerized applications across multiple hosts; providing basic mechanisms for deployment, maintenance, and scaling of applications.
Kubernetes builds upon a decade and a half of experience at Google running production workloads at scale using a system called Borg, combined with best-of-breed ideas and practices from the community.
Kubernetes is hosted by the Cloud Native Computing Foundation (CNCF). If you are a company that wants to help shape the evolution of technologies that are container-packaged, dynamically scheduled, and micro-services-oriented, consider joining the CNCF. For details about who’s involved and how Kubernetes plays a role, read the CNCF announcement.
Changelog v1.24
Major Themes
Dockershim Removed from kubelet
After its deprecation in v1.20, the dockershim component has been removed from the kubelet. From v1.24 onwards, you will need to either use one of the other supported runtimes (such as containerd or CRI-O) or use cri-dockerd if you are relying on Docker Engine as your container runtime. For more information about ensuring your cluster is ready for this removal, please see this guide.
Beta APIs Off by Default
New beta APIs will not be enabled in clusters by default. Existing beta APIs and new versions of existing beta APIs, will continue to be enabled by default.
Signing Release Artifacts
Release artifacts are signed using cosign signatures and there is experimental support for verifying image signatures. Signing and verification of release artifacts is part of increasing software supply chain security for the Kubernetes release process.
OpenAPI v3
Kubernetes 1.24 offers beta support for publishing its APIs in the OpenAPI v3 format.
Storage Capacity and Volume Expansion Are Generally Available
Storage capacity tracking supports exposing currently available storage capacity via CSIStorageCapacity objects and enhances scheduling of pods that use CSI volumes with late binding.
Volume expansion adds support for resizing existing persistent volumes.
NonPreemptingPriority to Stable
This feature adds a new option to PriorityClasses, which can enable or disable pod preemption.
Storage Plugin Migration
There is work under way to migrate the internals of in-tree storage plugins to call out to CSI Plugins, while maintaining the original API. The Azure Disk and OpenStack Cinder plugins have both been migrated.
gRPC Probes Graduate to Beta
With Kubernetes 1.24, the gRPC probes functionality has entered beta and is available by default. You can now configure startup, liveness, and readiness probes for your gRPC app natively within Kubernetes, without exposing an HTTP endpoint or using an extra executable.
Kubelet Credential Provider Graduates to Beta
Originally released as Alpha in Kubernetes 1.20, the kubelet’s support for image credential providers has now graduated to Beta. This allows the kubelet to dynamically retrieve credentials for a container image registry using exec plugins, rather than storing credentials on the node’s filesystem.
Contextual Logging in Alpha
Kubernetes 1.24 has introduced contextual logging that enables the caller of a function to control all aspects of logging (output formatting, verbosity, additional values and names).
Avoiding Collisions in IP allocation to Services
Kubernetes 1.24 introduced a new opt-in feature that allows you to soft-reserve a range for static IP address assignments to Services. With the manual enablement of this feature, the cluster will prefer automatic assignment from the pool of Service IP addresses thereby reducing the risk of collision.
A Service
ClusterIPcan be assigned:
- dynamically, which means the cluster will automatically pick a free IP within the configured Service IP range.
- statically, which means the user will set one IP within the configured Service IP range.
Service
ClusterIPare unique, hence, trying to create a Service with aClusterIPthat has already been allocated will return an error.More…
