• Calico is now deployed in eBPF dataplane mode.
• Clusters with IPv6 enabled previously were configured to use the ipvs mode of kube-proxy which got deprecated with Kubernetes v1.35 [3].
  Due to that deprecation, changes to the CNI setup were necessary.
  Calico's eBPF dataplane mode has been chosen due to its performance benefits.
  A migration path for existing clusters has been implemented.
• kube-proxy is disabled by default now as it interferes with Calico running in eBPF dataplane mode.
• When upgrading an existing cluster to this release, changes to the cluster repository's flake.nix are necessary.
• The necessary changes for Ubuntu 26.04 have been implemented.
• Routes to the Kubernetes Service IP range are propagated by Calico to BGP peers by default now.
• Components of the monitoring stack can now be freely configured.
• Support for Envoy Gateway as Gateway API integration has been added.
• A migration for clusters already using the Calico Ingress Gateway has been implemented.
• The "sntrup761x25519-sha512" post-quantum key exchange algorithm has been enabled for SSH.

Some notable changes specifically for clusters on OpenStack or Proxmox:

• The bird setup has been made compatible with bird3. Debian 13 can now be used for gateway nodes.
• OpenStack Anti-Affinity-Groups can now be configured for any node.
• Support for IPSec has been dropped.

Check out the release notes [4] to get information about all the other changes and for more details!

Best regards

---

[1] https://gitlab.com/alasca.cloud/tarook/tarook/-/releases/v15.0.0
[2] https://meta.docs.tarook.cloud/supported_releases
[2] https://kubernetes.io/blog/2025/12/17/kubernetes-v1-35-release/#deprecation-of-ipvs-mode-in-kube-proxy
[3] https://docs.tarook.cloud/release/v15.0/releasenotes

-- 
Steve Starke
Team Lead Kubernetes

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