v0.9.0 Focuses on stability enhancements following v0.8.0 / v0.8.1, a new wave of features will ship in v0.10.0.

Breaking changes have been kept to a minimum, primarily that Kubernetes v1.12.X is no longer supported to make way for some fixes requiring beta-grade kubeadm.

Breaking Changes

• The default node image is a Kubernetes v1.19.1 image: kindest/node:v1.19.1@sha256:98cf5288864662e37115e362b23e4369c8c4a408f99cbc06e58ac30ddc721600
• Node images built with kind v0.9.0 require using kind v0.9.0+.
  • These images should mostly work with older releases but may not work offline.
  • Images from kind v0.8.0+ should still work but lack some internal improvements
• Support has been dropped for Kubernetes older than v1.13.0.
  • A detailed support policy is in the works. The Kubernetes project only supports v1.16+ currently.
  • UPDATE: Kubernetes v1.14+ is required for multi-node clusters. See https://github.com/kubernetes-sigs/kind/pull/1744#issuecomment-692905480
• Building Kubernetes with bazel will only work with Kubernetes v1.15+
  • Building without bazel still works back to v1.13.0
• v1alpha3 kind config is no longer supported. Please upgrade to v1alpha4 (which was already the current version in previous releases)
• Capital letters in cluster names are explicitly rejected by kind, in order to prevent encountering upstream issues with name validation

UPDATE: If you are hitting label key and value greater than maximum size (4096 bytes), key: containerd: invalid argument (https://github.com/containerd/cri/pull/1572), then try the following KIND config:

kind: Cluster
apiVersion: kind.x-k8s.io/v1alpha4
containerdConfigPatches:
- |-
  [plugins."io.containerd.grpc.v1.cri".containerd]
  disable_snapshot_annotations = true

See: https://kind.sigs.k8s.io/docs/user/configuration/#getting-started for how to use a KIND config file.

New Features

• NFS volumes should now work
• Kubernetes RuntimeConfig is now first class in kind config
• Upgraded dependencies across the board
• Nodes now have a tenative providerID value set. We commit to the kind:// prefix but the rest of the contents may change.
• The base image is tentatively multi-arch by default. The node image is still not as of yet.
• More values are automatically included in no_proxy when proxies are detected
• The default CNI shoult automatically match MTU to the underlying bridge
• Binaries are now stripped of debugger (not stacktrace) info for smaller binaries

New Node images have been built for kind v0.9.0, please use these exact images (IE like v1.19.1:@sha256:98cf5288864662e37115e362b23e4369c8c4a408f99cbc06e58ac30ddc721600 including the digest) or build your own as we may need to change the image format again in the future :sweat_smile:

Images built for this release:

• 1.19: kindest/node:v1.19.1@sha256:98cf5288864662e37115e362b23e4369c8c4a408f99cbc06e58ac30ddc721600
• 1.18: kindest/node:v1.18.8@sha256:f4bcc97a0ad6e7abaf3f643d890add7efe6ee4ab90baeb374b4f41a4c95567eb
• 1.17: kindest/node:v1.17.11@sha256:5240a7a2c34bf241afb54ac05669f8a46661912eab05705d660971eeb12f6555
• 1.16: kindest/node:v1.16.15@sha256:a89c771f7de234e6547d43695c7ab047809ffc71a0c3b65aa54eda051c45ed20
• 1.15: kindest/node:v1.15.12@sha256:d9b939055c1e852fe3d86955ee24976cab46cba518abcb8b13ba70917e6547a6
• 1.14: kindest/node:v1.14.10@sha256:ce4355398a704fca68006f8a29f37aafb49f8fc2f64ede3ccd0d9198da910146
• 1.13: kindest/node:v1.13.12@sha256:1c1a48c2bfcbae4d5f4fa4310b5ed10756facad0b7a2ca93c7a4b5bae5db29f5

Fixes

• Limited fixes related to HA mode and restart support
• Fixed issues with ipv6 network overlap
• Fixed bugs with NO_PROXY generation
• Mitigated issues with concurrent cluster creation on clean hosts
• KUBECONFIG writing has retries to mitigate concurrency / locking issues
• Docker data root on ZFS should be fixed
• Fixed building with bazel in kubernetes 1.20 development
• Implemented assorted workarounds for breaking bugs in podman v2.X
• Upstream CNI fixes identified by the project have been upstreamed and picked up to mitigate excessive iptables calls in testing
• Replaced broken component IP auto-detection with explicit addresses to work around upstream Kubernetes limitations (pending an agreement on how to move forward upstream)
• Fixed some issues with userns-remap support
• Fixed port forwarding in some cases

Contributors

Thanks again to everyone who contributed to this release! ❤️

Users whose commits are in this release (alphabetically by user name)

• @afbjorklund
• @aledbf
• @amwat
• @aojea
• @babilen5
• @BenTheElder
• @damdo
• @dims
• @ericsyh
• @faiq
• @giuseppe
• @HadesArchitect
• @Hellcatlk
• @inercia
• @izzyleung
• @jayunit100
• @k8s-ci-robot
• @liggitt
• @MaXinjian
• @MaxRenaud
• @mikedanese
• @oomichi
• @peteroneilljr
• @prasadkatti
• @rcarrillocruz
• @rikatz
• @SataQiu
• @sozercan
• @steigr
• @tao12345666333
• @vdice
• @yashbhutwala
• @zhijianli88