Kubernetes v1.31 “Elli” Release Highlights: New Stable, Beta, Alpha Features and Deprecations
Kubernetes v1.31 "Elli", released after the project’s ten‑year anniversary, introduces 45 enhancements—including 11 stable, 22 beta and 12 alpha features—spanning AppArmor GA, nftables support, multi‑Service CIDR, a new DRA API, image‑as‑volume, CPUManager improvements, and several deprecations and removals to streamline the platform.
Kubernetes v1.31, code‑named "Elli", was launched following the Kubernetes project’s ten‑year anniversary and brings 45 enhancements, with 11 features promoted to stable, 22 entering beta, and 12 reaching alpha status.
Stable features include full GA of AppArmor support, allowing users to protect containers by setting securityContext.appArmorProfile.type ; improved kube‑proxy entry‑connection reliability for LoadBalancer and externalTrafficPolicy:Cluster services; and a PersistentVolume status field that records the timestamp of the last phase transition, aiding monitoring and performance analysis.
Beta features add nftables as a backend for iptables, a revised PersistentVolume reclaim‑policy handling after PVC deletion, dynamic multi‑Service CIDR configuration without downtime, a trafficDistribution field for enhanced service traffic engineering, and the VolumeAttributesClass ModifyVolume API that lets workloads adjust volume parameters such as pre‑configured I/O for vertical scaling.
Alpha features showcase a new Dynamic Resource Allocation (DRA) API with richer resource descriptors, experimental support for using OCI images directly as pod volumes (enabled via the ImageVolume feature gate), and the CPUManager static policy option distribute-cpus-across-cores , which spreads CPU threads across physical cores to reduce contention.
The release also deprecates and removes several components to streamline the architecture: cgroup v1 moves to maintenance mode encouraging migration to cgroup v2; all in‑tree cloud‑provider integrations are removed to make Kubernetes truly vendor‑neutral; the kubelet flag --keep-terminated-pod-volumes is eliminated; and the CephFS and Ceph RBD in‑tree volume plugins are dropped in favor of CSI drivers.
Overall, Kubernetes v1.31 reflects the community’s vibrant growth and continued confidence, reinforcing Kubernetes’s central role in the cloud‑native ecosystem and driving forward container orchestration and cluster management innovations.
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