Last Week in Kubernetes Development
Stay up-to-date on Kubernetes development in 15 minutes a week.
Week Ending April 26, 2020
Developer News
The Kubernetes 1.19 release schedule has changed, see below.
The kubernetes-anywhere project, a deprecated predecessor to kubeadm, has been archived.
Release Schedule
Next Deadline: Enhancements Freeze May 19th
Due to the effect of COVID-19 on many people’s schedules, the release of v1.19 is officially postponed to August 4th in order to give all contributors a more relaxed release schedule. Code Freeze starts June 25th to give extra time for stabilizing. Patch support for v1.16 will be extended until September, implementing the Year Support KEP by default.
This means that only 3 versions of Kubernetes will be released this year. The project is undecided as to whether this might be a permanent change.
Featured PRs
#90018: Deprecate default conversions
Starting off this week with a simple but critical change. The release notes sum it up best so I’ll quote those directly:
scheme.Convert() now uses only explicitly registered conversions - default reflection based conversion is no longer available.
+k8s:conversion-gentags can be used with thek8s.io/code-generatorcomponent to generate conversions.
This is a great step towards removing a lot of the implicit magic on core types!
#89549: Monitoring safe rollout of time-bound service account token
As part of the push towards short-duration, auto-rotating ServiceAccount tokens, a new extension subsystem and tracking metrics help to test the new code paths without risking system stability. If an expiring token is used and --service-account-extend-token-expiration has been enabled, the token expiry will be automatically extended and a log message will be printed with details. There are also new metrics, legacy/stale/valid_tokens_total, to help track the impact and find any unexpected tokens that are still in use.
#89285: remove prometheus dependencies from k/k
And finally a small but notable PR, k/k is now entirely based off our metrics framework rather than the upstream Prometheus client library. This shouldn’t affect much but a thing to keep in mind when writing code which touches metrics. The metrics stability framework is similar to the upstream library but extends it with lifecycle rules that will help ensure people relying on Kubernetes metrics will see them follow our normal stability practices!
Other Merges
- Replace cache-control API headers that were accidentally dropped in v1.17
- Fix issues in utility backoff timer
- We need a fix for when pods are in the middle of binding and get modified by ServerSideApply; until someone figures that out, we have this workaround
- Keep container CPU reservations across container restarts in a pod, and don’t give up reservations owned by an init container
- Make kubeadm respect
--resolv-conf
Promotions
Deprecated
- autoscaling/v2beta1 deprecated in favor of v2beta2
- remove empty field
series.statefrom Events - deprecate old authn/authz API versions, namely
authentication.k8s.io/v1beta1andauthentication.k8s.io/v1beta1, in favor of v1
Last Week In Kubernetes Development (LWKD) is a product of multiple contributors participating in Kubernetes SIG Contributor Experience. All original content is licensed Creative Commons Share-Alike, although linked content and images may be differently licensed. LWKD does collect some information on readers, see our privacy notice for details.
You may contribute to LWKD by submitting pull requests or issues on the LWKD github repo.