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kops/docs/releases/1.6.0-alpha.1.md

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1.6.0-alpha.1

1.6.0-alpha.1 is a prerelease early-access of kops 1.6, which is the release with full support for kubernetes 1.6. This version of kops & kubernetes has not yet undergone extensive validation, and there will be improvements made before release of kops 1.6.0.

This is not a full set of release notes, but rather a summary of the highest impact changes in the 1.6 release:

  • RBAC can be enabled by passing the --authorization=rbac parameter to kops create cluster, or via kops edit cluster and change authorization from alwaysAllow: {} to rbac: {}

  • The standard RBAC policy for 1.6 means that all access to the Kubernetes API using the default service account method will be denied.

  • The taints & tolerations have changed as part of their graduation from alpha. The taint is now a field on the node:

spec:
  taints:
  - effect: NoSchedule
    key: node-role.kubernetes.io/master

An example toleration (as used in dns-controller) is:

spec:
  tolerations:
  - effect: NoSchedule
    key: node-role.kubernetes.io/master

Note that the annotation form is ignored. To schedule a pod on the master, the toleration must be updated and moved from an annotation to the field.

  • A new label for nodes, mirroring the toleration, is added and is now preferred: node-role.kubernetes.io/master= (node-role.kubernetes.io/master with an empty value). kubernetes.io/role=master is still present, but the node-role.kubernetes.io/<role>= form is preferred. kubernetes.io/role=node and node-role.kubernetes.io/node= are also present.

Workaround: create the configmap with kubectl create configmap -n kube-system kube-dns before updating.

Known Issues

Rolling updates

Rolling update to 1.6 does not succeed because new kube-dns pods mount a configmap with an optional volume map, but that is enforced by the kubelets, which are upgraded after the master.

etcd3

kops is not yet recommending etcd3. We do however support a run at your own risk option. Right now we are working on resolving issues such as HA upgrade support.